2020-07-24 09:10:41

by Laurentiu Palcu

Subject: [PATCH v8 2/5] drm/imx: Add initial support for DCSS on iMX8MQ

From: Laurentiu Palcu <[email protected]>

This adds initial support for iMX8MQ's Display Controller Subsystem (DCSS).
Some of its capabilities include:
* 4K@60fps;
* HDR10;
* one graphics and 2 video pipelines;
* on-the-fly decompression of compressed video and graphics;

The reference manual can be found here:
https://www.nxp.com/webapp/Download?colCode=IMX8MDQLQRM

The current patch adds only basic functionality: one primary plane for
graphics, linear, tiled and super-tiled buffers support (no graphics
decompression yet), no HDR10 and no video planes.

Video planes support and HDR10 will be added in subsequent patches once
per-plane de-gamma/CSC/gamma support is in.

Signed-off-by: Laurentiu Palcu <[email protected]>
Reviewed-by: Lucas Stach <[email protected]>
---
drivers/gpu/drm/imx/Kconfig | 2 +
drivers/gpu/drm/imx/Makefile | 1 +
drivers/gpu/drm/imx/dcss/Kconfig | 8 +
drivers/gpu/drm/imx/dcss/Makefile | 6 +
drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 70 +++
drivers/gpu/drm/imx/dcss/dcss-crtc.c | 219 +++++++
drivers/gpu/drm/imx/dcss/dcss-ctxld.c | 424 +++++++++++++
drivers/gpu/drm/imx/dcss/dcss-dev.c | 314 ++++++++++
drivers/gpu/drm/imx/dcss/dcss-dev.h | 177 ++++++
drivers/gpu/drm/imx/dcss/dcss-dpr.c | 562 +++++++++++++++++
drivers/gpu/drm/imx/dcss/dcss-drv.c | 138 +++++
drivers/gpu/drm/imx/dcss/dcss-dtg.c | 409 ++++++++++++
drivers/gpu/drm/imx/dcss/dcss-kms.c | 177 ++++++
drivers/gpu/drm/imx/dcss/dcss-kms.h | 43 ++
drivers/gpu/drm/imx/dcss/dcss-plane.c | 405 ++++++++++++
drivers/gpu/drm/imx/dcss/dcss-scaler.c | 826 +++++++++++++++++++++++++
drivers/gpu/drm/imx/dcss/dcss-ss.c | 180 ++++++
17 files changed, 3961 insertions(+)
create mode 100644 drivers/gpu/drm/imx/dcss/Kconfig
create mode 100644 drivers/gpu/drm/imx/dcss/Makefile
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-blkctl.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-crtc.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ctxld.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.h
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dpr.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-drv.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dtg.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.h
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-plane.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-scaler.c
create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ss.c

diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
index 207bf7409dfb..6231048aa5aa 100644
--- a/drivers/gpu/drm/imx/Kconfig
+++ b/drivers/gpu/drm/imx/Kconfig
@@ -39,3 +39,5 @@ config DRM_IMX_HDMI
depends on DRM_IMX
help
Choose this if you want to use HDMI on i.MX6.
+
+source "drivers/gpu/drm/imx/dcss/Kconfig"
diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile
index 21cdcc2faabc..b644deffe948 100644
--- a/drivers/gpu/drm/imx/Makefile
+++ b/drivers/gpu/drm/imx/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o

obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
+obj-$(CONFIG_DRM_IMX_DCSS) += dcss/
diff --git a/drivers/gpu/drm/imx/dcss/Kconfig b/drivers/gpu/drm/imx/dcss/Kconfig
new file mode 100644
index 000000000000..a76435924b6a
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/Kconfig
@@ -0,0 +1,8 @@
+config DRM_IMX_DCSS
+ tristate "i.MX8MQ DCSS"
+ select IMX_IRQSTEER
+ select DRM_KMS_CMA_HELPER
+ depends on DRM && ARCH_MXC
+ help
+ Choose this if you have a NXP i.MX8MQ based system and want to use the
+ Display Controller Subsystem. This option enables DCSS support.
diff --git a/drivers/gpu/drm/imx/dcss/Makefile b/drivers/gpu/drm/imx/dcss/Makefile
new file mode 100644
index 000000000000..8c7c8da42792
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/Makefile
@@ -0,0 +1,6 @@
+imx-dcss-objs := dcss-drv.o dcss-dev.o dcss-blkctl.o dcss-ctxld.o dcss-dtg.o \
+ dcss-ss.o dcss-dpr.o dcss-scaler.o dcss-kms.o dcss-crtc.o \
+ dcss-plane.o
+
+obj-$(CONFIG_DRM_IMX_DCSS) += imx-dcss.o
+
diff --git a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
new file mode 100644
index 000000000000..c9b54bb2692d
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_BLKCTL_RESET_CTRL 0x00
+#define B_CLK_RESETN BIT(0)
+#define APB_CLK_RESETN BIT(1)
+#define P_CLK_RESETN BIT(2)
+#define RTR_CLK_RESETN BIT(4)
+#define DCSS_BLKCTL_CONTROL0 0x10
+#define HDMI_MIPI_CLK_SEL BIT(0)
+#define DISPMIX_REFCLK_SEL_POS 4
+#define DISPMIX_REFCLK_SEL_MASK GENMASK(5, 4)
+#define DISPMIX_PIXCLK_SEL BIT(8)
+#define HDMI_SRC_SECURE_EN BIT(16)
+
+struct dcss_blkctl {
+ struct dcss_dev *dcss;
+ void __iomem *base_reg;
+};
+
+void dcss_blkctl_cfg(struct dcss_blkctl *blkctl)
+{
+ if (blkctl->dcss->hdmi_output)
+ dcss_writel(0, blkctl->base_reg + DCSS_BLKCTL_CONTROL0);
+ else
+ dcss_writel(DISPMIX_PIXCLK_SEL,
+ blkctl->base_reg + DCSS_BLKCTL_CONTROL0);
+
+ dcss_set(B_CLK_RESETN | APB_CLK_RESETN | P_CLK_RESETN | RTR_CLK_RESETN,
+ blkctl->base_reg + DCSS_BLKCTL_RESET_CTRL);
+}
+
+int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
+{
+ struct dcss_blkctl *blkctl;
+
+ blkctl = kzalloc(sizeof(*blkctl), GFP_KERNEL);
+ if (!blkctl)
+ return -ENOMEM;
+
+ blkctl->base_reg = ioremap(blkctl_base, SZ_4K);
+ if (!blkctl->base_reg) {
+ dev_err(dcss->dev, "unable to remap BLK CTRL base\n");
+ kfree(blkctl);
+ return -ENOMEM;
+ }
+
+ dcss->blkctl = blkctl;
+ blkctl->dcss = dcss;
+
+ dcss_blkctl_cfg(blkctl);
+
+ return 0;
+}
+
+void dcss_blkctl_exit(struct dcss_blkctl *blkctl)
+{
+ if (blkctl->base_reg)
+ iounmap(blkctl->base_reg);
+
+ kfree(blkctl);
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-crtc.c b/drivers/gpu/drm/imx/dcss/dcss-crtc.c
new file mode 100644
index 000000000000..36abff0890b2
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-crtc.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_vblank.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "dcss-dev.h"
+#include "dcss-kms.h"
+
+static int dcss_enable_vblank(struct drm_crtc *crtc)
+{
+ struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
+ base);
+ struct dcss_dev *dcss = crtc->dev->dev_private;
+
+ dcss_dtg_vblank_irq_enable(dcss->dtg, true);
+
+ dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
+
+ enable_irq(dcss_crtc->irq);
+
+ return 0;
+}
+
+static void dcss_disable_vblank(struct drm_crtc *crtc)
+{
+ struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
+ base);
+ struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
+
+ disable_irq_nosync(dcss_crtc->irq);
+
+ dcss_dtg_vblank_irq_enable(dcss->dtg, false);
+
+ if (dcss_crtc->disable_ctxld_kick_irq)
+ dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, false);
+}
+
+static const struct drm_crtc_funcs dcss_crtc_funcs = {
+ .set_config = drm_atomic_helper_set_config,
+ .destroy = drm_crtc_cleanup,
+ .page_flip = drm_atomic_helper_page_flip,
+ .reset = drm_atomic_helper_crtc_reset,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+ .enable_vblank = dcss_enable_vblank,
+ .disable_vblank = dcss_disable_vblank,
+};
+
+static void dcss_crtc_atomic_begin(struct drm_crtc *crtc,
+ struct drm_crtc_state *old_crtc_state)
+{
+ drm_crtc_vblank_on(crtc);
+}
+
+static void dcss_crtc_atomic_flush(struct drm_crtc *crtc,
+ struct drm_crtc_state *old_crtc_state)
+{
+ struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
+ base);
+ struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
+
+ spin_lock_irq(&crtc->dev->event_lock);
+ if (crtc->state->event) {
+ WARN_ON(drm_crtc_vblank_get(crtc));
+ drm_crtc_arm_vblank_event(crtc, crtc->state->event);
+ crtc->state->event = NULL;
+ }
+ spin_unlock_irq(&crtc->dev->event_lock);
+
+ if (dcss_dtg_is_enabled(dcss->dtg))
+ dcss_ctxld_enable(dcss->ctxld);
+}
+
+static void dcss_crtc_atomic_enable(struct drm_crtc *crtc,
+ struct drm_crtc_state *old_crtc_state)
+{
+ struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
+ base);
+ struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
+ struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+ struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
+ struct videomode vm;
+
+ drm_display_mode_to_videomode(mode, &vm);
+
+ pm_runtime_get_sync(dcss->dev);
+
+ vm.pixelclock = mode->crtc_clock * 1000;
+
+ dcss_ss_subsam_set(dcss->ss);
+ dcss_dtg_css_set(dcss->dtg);
+
+ if (!drm_mode_equal(mode, old_mode) || !old_crtc_state->active) {
+ dcss_dtg_sync_set(dcss->dtg, &vm);
+ dcss_ss_sync_set(dcss->ss, &vm,
+ mode->flags & DRM_MODE_FLAG_PHSYNC,
+ mode->flags & DRM_MODE_FLAG_PVSYNC);
+ }
+
+ dcss_enable_dtg_and_ss(dcss);
+
+ dcss_ctxld_enable(dcss->ctxld);
+
+ /* Allow CTXLD kick interrupt to be disabled when VBLANK is disabled. */
+ dcss_crtc->disable_ctxld_kick_irq = true;
+}
+
+static void dcss_crtc_atomic_disable(struct drm_crtc *crtc,
+ struct drm_crtc_state *old_crtc_state)
+{
+ struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
+ base);
+ struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
+ struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+ struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
+
+ drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false);
+
+ spin_lock_irq(&crtc->dev->event_lock);
+ if (crtc->state->event) {
+ drm_crtc_send_vblank_event(crtc, crtc->state->event);
+ crtc->state->event = NULL;
+ }
+ spin_unlock_irq(&crtc->dev->event_lock);
+
+ dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
+
+ reinit_completion(&dcss->disable_completion);
+
+ dcss_disable_dtg_and_ss(dcss);
+
+ dcss_ctxld_enable(dcss->ctxld);
+
+ if (!drm_mode_equal(mode, old_mode) || !crtc->state->active)
+ if (!wait_for_completion_timeout(&dcss->disable_completion,
+ msecs_to_jiffies(100)))
+ dev_err(dcss->dev, "Shutting off DTG timed out.\n");
+
+ /*
+ * Do not shut off CTXLD kick interrupt when shutting VBLANK off. It
+ * will be needed to commit the last changes, before going to suspend.
+ */
+ dcss_crtc->disable_ctxld_kick_irq = false;
+
+ drm_crtc_vblank_off(crtc);
+
+ pm_runtime_mark_last_busy(dcss->dev);
+ pm_runtime_put_autosuspend(dcss->dev);
+}
+
+static const struct drm_crtc_helper_funcs dcss_helper_funcs = {
+ .atomic_begin = dcss_crtc_atomic_begin,
+ .atomic_flush = dcss_crtc_atomic_flush,
+ .atomic_enable = dcss_crtc_atomic_enable,
+ .atomic_disable = dcss_crtc_atomic_disable,
+};
+
+static irqreturn_t dcss_crtc_irq_handler(int irq, void *dev_id)
+{
+ struct dcss_crtc *dcss_crtc = dev_id;
+ struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
+
+ if (!dcss_dtg_vblank_irq_valid(dcss->dtg))
+ return IRQ_NONE;
+
+ if (dcss_ctxld_is_flushed(dcss->ctxld))
+ drm_crtc_handle_vblank(&dcss_crtc->base);
+
+ dcss_dtg_vblank_irq_clear(dcss->dtg);
+
+ return IRQ_HANDLED;
+}
+
+int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm)
+{
+ struct dcss_dev *dcss = drm->dev_private;
+ struct platform_device *pdev = to_platform_device(dcss->dev);
+ int ret;
+
+ crtc->plane[0] = dcss_plane_init(drm, drm_crtc_mask(&crtc->base),
+ DRM_PLANE_TYPE_PRIMARY, 0);
+ if (IS_ERR(crtc->plane[0]))
+ return PTR_ERR(crtc->plane[0]);
+
+ crtc->base.port = dcss->of_port;
+
+ drm_crtc_helper_add(&crtc->base, &dcss_helper_funcs);
+ ret = drm_crtc_init_with_planes(drm, &crtc->base, &crtc->plane[0]->base,
+ NULL, &dcss_crtc_funcs, NULL);
+ if (ret) {
+ dev_err(dcss->dev, "failed to init crtc\n");
+ return ret;
+ }
+
+ crtc->irq = platform_get_irq_byname(pdev, "vblank");
+ if (crtc->irq < 0)
+ return crtc->irq;
+
+ ret = request_irq(crtc->irq, dcss_crtc_irq_handler,
+ 0, "dcss_drm", crtc);
+ if (ret) {
+ dev_err(dcss->dev, "irq request failed with %d.\n", ret);
+ return ret;
+ }
+
+ disable_irq(crtc->irq);
+
+ return 0;
+}
+
+void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm)
+{
+ free_irq(crtc->irq, crtc);
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
new file mode 100644
index 000000000000..3a84cb3209c4
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
@@ -0,0 +1,424 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_CTXLD_CONTROL_STATUS 0x0
+#define CTXLD_ENABLE BIT(0)
+#define ARB_SEL BIT(1)
+#define RD_ERR_EN BIT(2)
+#define DB_COMP_EN BIT(3)
+#define SB_HP_COMP_EN BIT(4)
+#define SB_LP_COMP_EN BIT(5)
+#define DB_PEND_SB_REC_EN BIT(6)
+#define SB_PEND_DISP_ACTIVE_EN BIT(7)
+#define AHB_ERR_EN BIT(8)
+#define RD_ERR BIT(16)
+#define DB_COMP BIT(17)
+#define SB_HP_COMP BIT(18)
+#define SB_LP_COMP BIT(19)
+#define DB_PEND_SB_REC BIT(20)
+#define SB_PEND_DISP_ACTIVE BIT(21)
+#define AHB_ERR BIT(22)
+#define DCSS_CTXLD_DB_BASE_ADDR 0x10
+#define DCSS_CTXLD_DB_COUNT 0x14
+#define DCSS_CTXLD_SB_BASE_ADDR 0x18
+#define DCSS_CTXLD_SB_COUNT 0x1C
+#define SB_HP_COUNT_POS 0
+#define SB_HP_COUNT_MASK 0xffff
+#define SB_LP_COUNT_POS 16
+#define SB_LP_COUNT_MASK 0xffff0000
+#define DCSS_AHB_ERR_ADDR 0x20
+
+#define CTXLD_IRQ_COMPLETION (DB_COMP | SB_HP_COMP | SB_LP_COMP)
+#define CTXLD_IRQ_ERROR (RD_ERR | DB_PEND_SB_REC | AHB_ERR)
+
+/* The following sizes are in context loader entries, 8 bytes each. */
+#define CTXLD_DB_CTX_ENTRIES 1024 /* max 65536 */
+#define CTXLD_SB_LP_CTX_ENTRIES 10240 /* max 65536 */
+#define CTXLD_SB_HP_CTX_ENTRIES 20000 /* max 65536 */
+#define CTXLD_SB_CTX_ENTRIES (CTXLD_SB_LP_CTX_ENTRIES + \
+ CTXLD_SB_HP_CTX_ENTRIES)
+
+/* Sizes, in entries, of the DB, SB_HP and SB_LP context regions. */
+static u16 dcss_ctxld_ctx_size[3] = {
+ CTXLD_DB_CTX_ENTRIES,
+ CTXLD_SB_HP_CTX_ENTRIES,
+ CTXLD_SB_LP_CTX_ENTRIES
+};
+
+/* this represents an entry in the context loader map */
+struct dcss_ctxld_item {
+ u32 val;
+ u32 ofs;
+};
+
+#define CTX_ITEM_SIZE sizeof(struct dcss_ctxld_item)
+
+struct dcss_ctxld {
+ struct device *dev;
+ void __iomem *ctxld_reg;
+ int irq;
+ bool irq_en;
+
+ struct dcss_ctxld_item *db[2];
+ struct dcss_ctxld_item *sb_hp[2];
+ struct dcss_ctxld_item *sb_lp[2];
+
+ dma_addr_t db_paddr[2];
+ dma_addr_t sb_paddr[2];
+
+ u16 ctx_size[2][3]; /* holds the sizes of DB, SB_HP and SB_LP ctx */
+ u8 current_ctx;
+
+ bool in_use;
+ bool armed;
+
+ spinlock_t lock; /* protects concurent access to private data */
+};
+
+static irqreturn_t dcss_ctxld_irq_handler(int irq, void *data)
+{
+ struct dcss_ctxld *ctxld = data;
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev);
+ u32 irq_status;
+
+ irq_status = dcss_readl(ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+
+ if (irq_status & CTXLD_IRQ_COMPLETION &&
+ !(irq_status & CTXLD_ENABLE) && ctxld->in_use) {
+ ctxld->in_use = false;
+
+ if (dcss && dcss->disable_callback)
+ dcss->disable_callback(dcss);
+ } else if (irq_status & CTXLD_IRQ_ERROR) {
+ /*
+ * Except for throwing an error message and clearing the status
+ * register, there's not much we can do here.
+ */
+ dev_err(ctxld->dev, "ctxld: error encountered: %08x\n",
+ irq_status);
+ dev_err(ctxld->dev, "ctxld: db=%d, sb_hp=%d, sb_lp=%d\n",
+ ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_DB],
+ ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_HP],
+ ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_LP]);
+ }
+
+ dcss_clr(irq_status & (CTXLD_IRQ_ERROR | CTXLD_IRQ_COMPLETION),
+ ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+
+ return IRQ_HANDLED;
+}
+
+static int dcss_ctxld_irq_config(struct dcss_ctxld *ctxld,
+ struct platform_device *pdev)
+{
+ int ret;
+
+ ctxld->irq = platform_get_irq_byname(pdev, "ctxld");
+ if (ctxld->irq < 0)
+ return ctxld->irq;
+
+ ret = request_irq(ctxld->irq, dcss_ctxld_irq_handler,
+ 0, "dcss_ctxld", ctxld);
+ if (ret) {
+ dev_err(ctxld->dev, "ctxld: irq request failed.\n");
+ return ret;
+ }
+
+ ctxld->irq_en = true;
+
+ return 0;
+}
+
+static void dcss_ctxld_hw_cfg(struct dcss_ctxld *ctxld)
+{
+ dcss_writel(RD_ERR_EN | SB_HP_COMP_EN |
+ DB_PEND_SB_REC_EN | AHB_ERR_EN | RD_ERR | AHB_ERR,
+ ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+}
+
+static void dcss_ctxld_free_ctx(struct dcss_ctxld *ctxld)
+{
+ struct dcss_ctxld_item *ctx;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ if (ctxld->db[i]) {
+ dma_free_coherent(ctxld->dev,
+ CTXLD_DB_CTX_ENTRIES * sizeof(*ctx),
+ ctxld->db[i], ctxld->db_paddr[i]);
+ ctxld->db[i] = NULL;
+ ctxld->db_paddr[i] = 0;
+ }
+
+ if (ctxld->sb_hp[i]) {
+ dma_free_coherent(ctxld->dev,
+ CTXLD_SB_CTX_ENTRIES * sizeof(*ctx),
+ ctxld->sb_hp[i], ctxld->sb_paddr[i]);
+ ctxld->sb_hp[i] = NULL;
+ ctxld->sb_paddr[i] = 0;
+ }
+ }
+}
+
+static int dcss_ctxld_alloc_ctx(struct dcss_ctxld *ctxld)
+{
+ struct dcss_ctxld_item *ctx;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ ctx = dma_alloc_coherent(ctxld->dev,
+ CTXLD_DB_CTX_ENTRIES * sizeof(*ctx),
+ &ctxld->db_paddr[i], GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctxld->db[i] = ctx;
+
+ ctx = dma_alloc_coherent(ctxld->dev,
+ CTXLD_SB_CTX_ENTRIES * sizeof(*ctx),
+ &ctxld->sb_paddr[i], GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctxld->sb_hp[i] = ctx;
+ ctxld->sb_lp[i] = ctx + CTXLD_SB_HP_CTX_ENTRIES;
+ }
+
+ return 0;
+}
+
+int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
+{
+ struct dcss_ctxld *ctxld;
+ int ret;
+
+ ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL);
+ if (!ctxld)
+ return -ENOMEM;
+
+ dcss->ctxld = ctxld;
+ ctxld->dev = dcss->dev;
+
+ spin_lock_init(&ctxld->lock);
+
+ ret = dcss_ctxld_alloc_ctx(ctxld);
+ if (ret) {
+ dev_err(dcss->dev, "ctxld: cannot allocate context memory.\n");
+ goto err;
+ }
+
+ ctxld->ctxld_reg = ioremap(ctxld_base, SZ_4K);
+ if (!ctxld->ctxld_reg) {
+ dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = dcss_ctxld_irq_config(ctxld, to_platform_device(dcss->dev));
+ if (ret)
+ goto err_irq;
+
+ dcss_ctxld_hw_cfg(ctxld);
+
+ return 0;
+
+err_irq:
+ iounmap(ctxld->ctxld_reg);
+
+err:
+ dcss_ctxld_free_ctx(ctxld);
+ kfree(ctxld);
+
+ return ret;
+}
+
+void dcss_ctxld_exit(struct dcss_ctxld *ctxld)
+{
+ free_irq(ctxld->irq, ctxld);
+
+ if (ctxld->ctxld_reg)
+ iounmap(ctxld->ctxld_reg);
+
+ dcss_ctxld_free_ctx(ctxld);
+ kfree(ctxld);
+}
+
+static int dcss_ctxld_enable_locked(struct dcss_ctxld *ctxld)
+{
+ int curr_ctx = ctxld->current_ctx;
+ u32 db_base, sb_base, sb_count;
+ u32 sb_hp_cnt, sb_lp_cnt, db_cnt;
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev);
+
+ if (!dcss)
+ return 0;
+
+ dcss_dpr_write_sysctrl(dcss->dpr);
+
+ dcss_scaler_write_sclctrl(dcss->scaler);
+
+ sb_hp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_HP];
+ sb_lp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_LP];
+ db_cnt = ctxld->ctx_size[curr_ctx][CTX_DB];
+
+ /* make sure SB_LP context area comes after SB_HP */
+ if (sb_lp_cnt &&
+ ctxld->sb_lp[curr_ctx] != ctxld->sb_hp[curr_ctx] + sb_hp_cnt) {
+ struct dcss_ctxld_item *sb_lp_adjusted;
+
+ sb_lp_adjusted = ctxld->sb_hp[curr_ctx] + sb_hp_cnt;
+
+ memcpy(sb_lp_adjusted, ctxld->sb_lp[curr_ctx],
+ sb_lp_cnt * CTX_ITEM_SIZE);
+ }
+
+ db_base = db_cnt ? ctxld->db_paddr[curr_ctx] : 0;
+
+ dcss_writel(db_base, ctxld->ctxld_reg + DCSS_CTXLD_DB_BASE_ADDR);
+ dcss_writel(db_cnt, ctxld->ctxld_reg + DCSS_CTXLD_DB_COUNT);
+
+ if (sb_hp_cnt)
+ sb_count = ((sb_hp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK) |
+ ((sb_lp_cnt << SB_LP_COUNT_POS) & SB_LP_COUNT_MASK);
+ else
+ sb_count = (sb_lp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK;
+
+ sb_base = sb_count ? ctxld->sb_paddr[curr_ctx] : 0;
+
+ dcss_writel(sb_base, ctxld->ctxld_reg + DCSS_CTXLD_SB_BASE_ADDR);
+ dcss_writel(sb_count, ctxld->ctxld_reg + DCSS_CTXLD_SB_COUNT);
+
+ /* enable the context loader */
+ dcss_set(CTXLD_ENABLE, ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
+
+ ctxld->in_use = true;
+
+ /*
+ * Toggle the current context to the alternate one so that any updates
+ * in the modules' settings take place there.
+ */
+ ctxld->current_ctx ^= 1;
+
+ ctxld->ctx_size[ctxld->current_ctx][CTX_DB] = 0;
+ ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] = 0;
+ ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] = 0;
+
+ return 0;
+}
+
+int dcss_ctxld_enable(struct dcss_ctxld *ctxld)
+{
+ spin_lock_irq(&ctxld->lock);
+ ctxld->armed = true;
+ spin_unlock_irq(&ctxld->lock);
+
+ return 0;
+}
+
+void dcss_ctxld_kick(struct dcss_ctxld *ctxld)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctxld->lock, flags);
+ if (ctxld->armed && !ctxld->in_use) {
+ ctxld->armed = false;
+ dcss_ctxld_enable_locked(ctxld);
+ }
+ spin_unlock_irqrestore(&ctxld->lock, flags);
+}
+
+void dcss_ctxld_write_irqsafe(struct dcss_ctxld *ctxld, u32 ctx_id, u32 val,
+ u32 reg_ofs)
+{
+ int curr_ctx = ctxld->current_ctx;
+ struct dcss_ctxld_item *ctx[] = {
+ [CTX_DB] = ctxld->db[curr_ctx],
+ [CTX_SB_HP] = ctxld->sb_hp[curr_ctx],
+ [CTX_SB_LP] = ctxld->sb_lp[curr_ctx]
+ };
+ int item_idx = ctxld->ctx_size[curr_ctx][ctx_id];
+
+ if (item_idx + 1 > dcss_ctxld_ctx_size[ctx_id]) {
+ WARN_ON(1);
+ return;
+ }
+
+ ctx[ctx_id][item_idx].val = val;
+ ctx[ctx_id][item_idx].ofs = reg_ofs;
+ ctxld->ctx_size[curr_ctx][ctx_id] += 1;
+}
+
+void dcss_ctxld_write(struct dcss_ctxld *ctxld, u32 ctx_id,
+ u32 val, u32 reg_ofs)
+{
+ spin_lock_irq(&ctxld->lock);
+ dcss_ctxld_write_irqsafe(ctxld, ctx_id, val, reg_ofs);
+ spin_unlock_irq(&ctxld->lock);
+}
+
+bool dcss_ctxld_is_flushed(struct dcss_ctxld *ctxld)
+{
+ return ctxld->ctx_size[ctxld->current_ctx][CTX_DB] == 0 &&
+ ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] == 0 &&
+ ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] == 0;
+}
+
+int dcss_ctxld_resume(struct dcss_ctxld *ctxld)
+{
+ dcss_ctxld_hw_cfg(ctxld);
+
+ if (!ctxld->irq_en) {
+ enable_irq(ctxld->irq);
+ ctxld->irq_en = true;
+ }
+
+ return 0;
+}
+
+int dcss_ctxld_suspend(struct dcss_ctxld *ctxld)
+{
+ int ret = 0;
+ unsigned long timeout = jiffies + msecs_to_jiffies(500);
+
+ if (!dcss_ctxld_is_flushed(ctxld)) {
+ dcss_ctxld_kick(ctxld);
+
+ while (!time_after(jiffies, timeout) && ctxld->in_use)
+ msleep(20);
+
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+ }
+
+ spin_lock_irq(&ctxld->lock);
+
+ if (ctxld->irq_en) {
+ disable_irq_nosync(ctxld->irq);
+ ctxld->irq_en = false;
+ }
+
+ /* reset context region and sizes */
+ ctxld->current_ctx = 0;
+ ctxld->ctx_size[0][CTX_DB] = 0;
+ ctxld->ctx_size[0][CTX_SB_HP] = 0;
+ ctxld->ctx_size[0][CTX_SB_LP] = 0;
+
+ spin_unlock_irq(&ctxld->lock);
+
+ return ret;
+}
+
+void dcss_ctxld_assert_locked(struct dcss_ctxld *ctxld)
+{
+ lockdep_assert_held(&ctxld->lock);
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c b/drivers/gpu/drm/imx/dcss/dcss-dev.c
new file mode 100644
index 000000000000..83a4840435cf
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-dev.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/clk.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <drm/drm_modeset_helper.h>
+
+#include "dcss-dev.h"
+
+static void dcss_clocks_enable(struct dcss_dev *dcss)
+{
+ clk_prepare_enable(dcss->axi_clk);
+ clk_prepare_enable(dcss->apb_clk);
+ clk_prepare_enable(dcss->rtrm_clk);
+ clk_prepare_enable(dcss->dtrc_clk);
+ clk_prepare_enable(dcss->pix_clk);
+}
+
+static void dcss_clocks_disable(struct dcss_dev *dcss)
+{
+ clk_disable_unprepare(dcss->pix_clk);
+ clk_disable_unprepare(dcss->dtrc_clk);
+ clk_disable_unprepare(dcss->rtrm_clk);
+ clk_disable_unprepare(dcss->apb_clk);
+ clk_disable_unprepare(dcss->axi_clk);
+}
+
+static void dcss_disable_dtg_and_ss_cb(void *data)
+{
+ struct dcss_dev *dcss = data;
+
+ dcss->disable_callback = NULL;
+
+ dcss_ss_shutoff(dcss->ss);
+ dcss_dtg_shutoff(dcss->dtg);
+
+ complete(&dcss->disable_completion);
+}
+
+void dcss_disable_dtg_and_ss(struct dcss_dev *dcss)
+{
+ dcss->disable_callback = dcss_disable_dtg_and_ss_cb;
+}
+
+void dcss_enable_dtg_and_ss(struct dcss_dev *dcss)
+{
+ if (dcss->disable_callback)
+ dcss->disable_callback = NULL;
+
+ dcss_dtg_enable(dcss->dtg);
+ dcss_ss_enable(dcss->ss);
+}
+
+static int dcss_submodules_init(struct dcss_dev *dcss)
+{
+ int ret = 0;
+ u32 base_addr = dcss->start_addr;
+ const struct dcss_type_data *devtype = dcss->devtype;
+
+ dcss_clocks_enable(dcss);
+
+ ret = dcss_blkctl_init(dcss, base_addr + devtype->blkctl_ofs);
+ if (ret)
+ return ret;
+
+ ret = dcss_ctxld_init(dcss, base_addr + devtype->ctxld_ofs);
+ if (ret)
+ goto ctxld_err;
+
+ ret = dcss_dtg_init(dcss, base_addr + devtype->dtg_ofs);
+ if (ret)
+ goto dtg_err;
+
+ ret = dcss_ss_init(dcss, base_addr + devtype->ss_ofs);
+ if (ret)
+ goto ss_err;
+
+ ret = dcss_dpr_init(dcss, base_addr + devtype->dpr_ofs);
+ if (ret)
+ goto dpr_err;
+
+ ret = dcss_scaler_init(dcss, base_addr + devtype->scaler_ofs);
+ if (ret)
+ goto scaler_err;
+
+ dcss_clocks_disable(dcss);
+
+ return 0;
+
+scaler_err:
+ dcss_dpr_exit(dcss->dpr);
+
+dpr_err:
+ dcss_ss_exit(dcss->ss);
+
+ss_err:
+ dcss_dtg_exit(dcss->dtg);
+
+dtg_err:
+ dcss_ctxld_exit(dcss->ctxld);
+
+ctxld_err:
+ dcss_blkctl_exit(dcss->blkctl);
+
+ dcss_clocks_disable(dcss);
+
+ return ret;
+}
+
+static void dcss_submodules_stop(struct dcss_dev *dcss)
+{
+ dcss_clocks_enable(dcss);
+ dcss_scaler_exit(dcss->scaler);
+ dcss_dpr_exit(dcss->dpr);
+ dcss_ss_exit(dcss->ss);
+ dcss_dtg_exit(dcss->dtg);
+ dcss_ctxld_exit(dcss->ctxld);
+ dcss_blkctl_exit(dcss->blkctl);
+ dcss_clocks_disable(dcss);
+}
+
+static int dcss_clks_init(struct dcss_dev *dcss)
+{
+ int i;
+ struct {
+ const char *id;
+ struct clk **clk;
+ } clks[] = {
+ {"apb", &dcss->apb_clk},
+ {"axi", &dcss->axi_clk},
+ {"pix", &dcss->pix_clk},
+ {"rtrm", &dcss->rtrm_clk},
+ {"dtrc", &dcss->dtrc_clk},
+ };
+
+ for (i = 0; i < ARRAY_SIZE(clks); i++) {
+ *clks[i].clk = devm_clk_get(dcss->dev, clks[i].id);
+ if (IS_ERR(*clks[i].clk)) {
+ dev_err(dcss->dev, "failed to get %s clock\n",
+ clks[i].id);
+ return PTR_ERR(*clks[i].clk);
+ }
+ }
+
+ return 0;
+}
+
+static void dcss_clks_release(struct dcss_dev *dcss)
+{
+ devm_clk_put(dcss->dev, dcss->dtrc_clk);
+ devm_clk_put(dcss->dev, dcss->rtrm_clk);
+ devm_clk_put(dcss->dev, dcss->pix_clk);
+ devm_clk_put(dcss->dev, dcss->axi_clk);
+ devm_clk_put(dcss->dev, dcss->apb_clk);
+}
+
+struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ int ret;
+ struct resource *res;
+ struct dcss_dev *dcss;
+ const struct dcss_type_data *devtype;
+
+ devtype = of_device_get_match_data(dev);
+ if (!devtype) {
+ dev_err(dev, "no device match found\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "cannot get memory resource\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
+ if (!dcss)
+ return ERR_PTR(-ENOMEM);
+
+ dcss->dev = dev;
+ dcss->devtype = devtype;
+ dcss->hdmi_output = hdmi_output;
+
+ ret = dcss_clks_init(dcss);
+ if (ret) {
+ dev_err(dev, "clocks initialization failed\n");
+ goto err;
+ }
+
+ dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
+ if (!dcss->of_port) {
+ dev_err(dev, "no port@0 node in %s\n", dev->of_node->full_name);
+ ret = -ENODEV;
+ goto clks_err;
+ }
+
+ dcss->start_addr = res->start;
+
+ ret = dcss_submodules_init(dcss);
+ if (ret) {
+ dev_err(dev, "submodules initialization failed\n");
+ goto clks_err;
+ }
+
+ init_completion(&dcss->disable_completion);
+
+ pm_runtime_set_autosuspend_delay(dev, 100);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_allow(dev);
+ pm_runtime_enable(dev);
+
+ return dcss;
+
+clks_err:
+ dcss_clks_release(dcss);
+
+err:
+ kfree(dcss);
+
+ return ERR_PTR(ret);
+}
+
+void dcss_dev_destroy(struct dcss_dev *dcss)
+{
+ if (!pm_runtime_suspended(dcss->dev)) {
+ dcss_ctxld_suspend(dcss->ctxld);
+ dcss_clocks_disable(dcss);
+ }
+
+ pm_runtime_disable(dcss->dev);
+
+ dcss_submodules_stop(dcss);
+
+ dcss_clks_release(dcss);
+
+ kfree(dcss);
+}
+
+#ifdef CONFIG_PM_SLEEP
+int dcss_dev_suspend(struct device *dev)
+{
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
+ int ret;
+
+ drm_mode_config_helper_suspend(dcss_drv_dev_to_drm(dev));
+
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ ret = dcss_ctxld_suspend(dcss->ctxld);
+ if (ret)
+ return ret;
+
+ dcss_clocks_disable(dcss);
+
+ return 0;
+}
+
+int dcss_dev_resume(struct device *dev)
+{
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
+
+ if (pm_runtime_suspended(dev)) {
+ drm_mode_config_helper_resume(dcss_drv_dev_to_drm(dev));
+ return 0;
+ }
+
+ dcss_clocks_enable(dcss);
+
+ dcss_blkctl_cfg(dcss->blkctl);
+
+ dcss_ctxld_resume(dcss->ctxld);
+
+ drm_mode_config_helper_resume(dcss_drv_dev_to_drm(dev));
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+int dcss_dev_runtime_suspend(struct device *dev)
+{
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
+ int ret;
+
+ ret = dcss_ctxld_suspend(dcss->ctxld);
+ if (ret)
+ return ret;
+
+ dcss_clocks_disable(dcss);
+
+ return 0;
+}
+
+int dcss_dev_runtime_resume(struct device *dev)
+{
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
+
+ dcss_clocks_enable(dcss);
+
+ dcss_blkctl_cfg(dcss->blkctl);
+
+ dcss_ctxld_resume(dcss->ctxld);
+
+ return 0;
+}
+#endif /* CONFIG_PM */
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.h b/drivers/gpu/drm/imx/dcss/dcss-dev.h
new file mode 100644
index 000000000000..c642ae17837f
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-dev.h
@@ -0,0 +1,177 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2019 NXP.
+ */
+
+#ifndef __DCSS_PRV_H__
+#define __DCSS_PRV_H__
+
+#include <drm/drm_fourcc.h>
+#include <linux/io.h>
+#include <video/videomode.h>
+
+#define SET 0x04
+#define CLR 0x08
+#define TGL 0x0C
+
+#define dcss_writel(v, c) writel((v), (c))
+#define dcss_readl(c) readl(c)
+#define dcss_set(v, c) writel((v), (c) + SET)
+#define dcss_clr(v, c) writel((v), (c) + CLR)
+#define dcss_toggle(v, c) writel((v), (c) + TGL)
+
+static inline void dcss_update(u32 v, u32 m, void __iomem *c)
+{
+ writel((readl(c) & ~(m)) | (v), (c));
+}
+
+#define DCSS_DBG_REG(reg) {.name = #reg, .ofs = reg}
+
+enum {
+ DCSS_IMX8MQ = 0,
+};
+
+struct dcss_type_data {
+ const char *name;
+ u32 blkctl_ofs;
+ u32 ctxld_ofs;
+ u32 rdsrc_ofs;
+ u32 wrscl_ofs;
+ u32 dtg_ofs;
+ u32 scaler_ofs;
+ u32 ss_ofs;
+ u32 dpr_ofs;
+ u32 dtrc_ofs;
+ u32 dec400d_ofs;
+ u32 hdr10_ofs;
+};
+
+struct dcss_debug_reg {
+ char *name;
+ u32 ofs;
+};
+
+enum dcss_ctxld_ctx_type {
+ CTX_DB,
+ CTX_SB_HP, /* high-priority */
+ CTX_SB_LP, /* low-priority */
+};
+
+struct dcss_dev {
+ struct device *dev;
+ const struct dcss_type_data *devtype;
+ struct device_node *of_port;
+
+ u32 start_addr;
+
+ struct dcss_blkctl *blkctl;
+ struct dcss_ctxld *ctxld;
+ struct dcss_dpr *dpr;
+ struct dcss_dtg *dtg;
+ struct dcss_ss *ss;
+ struct dcss_hdr10 *hdr10;
+ struct dcss_scaler *scaler;
+ struct dcss_dtrc *dtrc;
+ struct dcss_dec400d *dec400d;
+ struct dcss_wrscl *wrscl;
+ struct dcss_rdsrc *rdsrc;
+
+ struct clk *apb_clk;
+ struct clk *axi_clk;
+ struct clk *pix_clk;
+ struct clk *rtrm_clk;
+ struct clk *dtrc_clk;
+ struct clk *pll_src_clk;
+ struct clk *pll_phy_ref_clk;
+
+ bool hdmi_output;
+
+ void (*disable_callback)(void *data);
+ struct completion disable_completion;
+};
+
+struct dcss_dev *dcss_drv_dev_to_dcss(struct device *dev);
+struct drm_device *dcss_drv_dev_to_drm(struct device *dev);
+struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output);
+void dcss_dev_destroy(struct dcss_dev *dcss);
+int dcss_dev_runtime_suspend(struct device *dev);
+int dcss_dev_runtime_resume(struct device *dev);
+int dcss_dev_suspend(struct device *dev);
+int dcss_dev_resume(struct device *dev);
+void dcss_enable_dtg_and_ss(struct dcss_dev *dcss);
+void dcss_disable_dtg_and_ss(struct dcss_dev *dcss);
+
+/* BLKCTL */
+int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base);
+void dcss_blkctl_cfg(struct dcss_blkctl *blkctl);
+void dcss_blkctl_exit(struct dcss_blkctl *blkctl);
+
+/* CTXLD */
+int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base);
+void dcss_ctxld_exit(struct dcss_ctxld *ctxld);
+void dcss_ctxld_write(struct dcss_ctxld *ctxld, u32 ctx_id,
+ u32 val, u32 reg_idx);
+int dcss_ctxld_resume(struct dcss_ctxld *dcss_ctxld);
+int dcss_ctxld_suspend(struct dcss_ctxld *dcss_ctxld);
+void dcss_ctxld_write_irqsafe(struct dcss_ctxld *ctlxd, u32 ctx_id, u32 val,
+ u32 reg_ofs);
+void dcss_ctxld_kick(struct dcss_ctxld *ctxld);
+bool dcss_ctxld_is_flushed(struct dcss_ctxld *ctxld);
+int dcss_ctxld_enable(struct dcss_ctxld *ctxld);
+void dcss_ctxld_register_completion(struct dcss_ctxld *ctxld,
+ struct completion *dis_completion);
+void dcss_ctxld_assert_locked(struct dcss_ctxld *ctxld);
+
+/* DPR */
+int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base);
+void dcss_dpr_exit(struct dcss_dpr *dpr);
+void dcss_dpr_write_sysctrl(struct dcss_dpr *dpr);
+void dcss_dpr_set_res(struct dcss_dpr *dpr, int ch_num, u32 xres, u32 yres);
+void dcss_dpr_addr_set(struct dcss_dpr *dpr, int ch_num, u32 luma_base_addr,
+ u32 chroma_base_addr, u16 pitch);
+void dcss_dpr_enable(struct dcss_dpr *dpr, int ch_num, bool en);
+void dcss_dpr_format_set(struct dcss_dpr *dpr, int ch_num,
+ const struct drm_format_info *format, u64 modifier);
+void dcss_dpr_set_rotation(struct dcss_dpr *dpr, int ch_num, u32 rotation);
+
+/* DTG */
+int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base);
+void dcss_dtg_exit(struct dcss_dtg *dtg);
+bool dcss_dtg_vblank_irq_valid(struct dcss_dtg *dtg);
+void dcss_dtg_vblank_irq_enable(struct dcss_dtg *dtg, bool en);
+void dcss_dtg_vblank_irq_clear(struct dcss_dtg *dtg);
+void dcss_dtg_sync_set(struct dcss_dtg *dtg, struct videomode *vm);
+void dcss_dtg_css_set(struct dcss_dtg *dtg);
+void dcss_dtg_enable(struct dcss_dtg *dtg);
+void dcss_dtg_shutoff(struct dcss_dtg *dtg);
+bool dcss_dtg_is_enabled(struct dcss_dtg *dtg);
+void dcss_dtg_ctxld_kick_irq_enable(struct dcss_dtg *dtg, bool en);
+bool dcss_dtg_global_alpha_changed(struct dcss_dtg *dtg, int ch_num, int alpha);
+void dcss_dtg_plane_alpha_set(struct dcss_dtg *dtg, int ch_num,
+ const struct drm_format_info *format, int alpha);
+void dcss_dtg_plane_pos_set(struct dcss_dtg *dtg, int ch_num,
+ int px, int py, int pw, int ph);
+void dcss_dtg_ch_enable(struct dcss_dtg *dtg, int ch_num, bool en);
+
+/* SUBSAM */
+int dcss_ss_init(struct dcss_dev *dcss, unsigned long subsam_base);
+void dcss_ss_exit(struct dcss_ss *ss);
+void dcss_ss_enable(struct dcss_ss *ss);
+void dcss_ss_shutoff(struct dcss_ss *ss);
+void dcss_ss_subsam_set(struct dcss_ss *ss);
+void dcss_ss_sync_set(struct dcss_ss *ss, struct videomode *vm,
+ bool phsync, bool pvsync);
+
+/* SCALER */
+int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base);
+void dcss_scaler_exit(struct dcss_scaler *scl);
+void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
+ const struct drm_format_info *format,
+ int src_xres, int src_yres, int dst_xres, int dst_yres,
+ u32 vrefresh_hz);
+void dcss_scaler_ch_enable(struct dcss_scaler *scl, int ch_num, bool en);
+int dcss_scaler_get_min_max_ratios(struct dcss_scaler *scl, int ch_num,
+ int *min, int *max);
+void dcss_scaler_write_sclctrl(struct dcss_scaler *scl);
+
+#endif /* __DCSS_PRV_H__ */
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dpr.c b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
new file mode 100644
index 000000000000..df9dab949bf2
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
@@ -0,0 +1,562 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_DPR_SYSTEM_CTRL0 0x000
+#define RUN_EN BIT(0)
+#define SOFT_RESET BIT(1)
+#define REPEAT_EN BIT(2)
+#define SHADOW_LOAD_EN BIT(3)
+#define SW_SHADOW_LOAD_SEL BIT(4)
+#define BCMD2AXI_MSTR_ID_CTRL BIT(16)
+#define DCSS_DPR_IRQ_MASK 0x020
+#define DCSS_DPR_IRQ_MASK_STATUS 0x030
+#define DCSS_DPR_IRQ_NONMASK_STATUS 0x040
+#define IRQ_DPR_CTRL_DONE BIT(0)
+#define IRQ_DPR_RUN BIT(1)
+#define IRQ_DPR_SHADOW_LOADED BIT(2)
+#define IRQ_AXI_READ_ERR BIT(3)
+#define DPR2RTR_YRGB_FIFO_OVFL BIT(4)
+#define DPR2RTR_UV_FIFO_OVFL BIT(5)
+#define DPR2RTR_FIFO_LD_BUF_RDY_YRGB_ERR BIT(6)
+#define DPR2RTR_FIFO_LD_BUF_RDY_UV_ERR BIT(7)
+#define DCSS_DPR_MODE_CTRL0 0x050
+#define RTR_3BUF_EN BIT(0)
+#define RTR_4LINE_BUF_EN BIT(1)
+#define TILE_TYPE_POS 2
+#define TILE_TYPE_MASK GENMASK(4, 2)
+#define YUV_EN BIT(6)
+#define COMP_2PLANE_EN BIT(7)
+#define PIX_SIZE_POS 8
+#define PIX_SIZE_MASK GENMASK(9, 8)
+#define PIX_LUMA_UV_SWAP BIT(10)
+#define PIX_UV_SWAP BIT(11)
+#define B_COMP_SEL_POS 12
+#define B_COMP_SEL_MASK GENMASK(13, 12)
+#define G_COMP_SEL_POS 14
+#define G_COMP_SEL_MASK GENMASK(15, 14)
+#define R_COMP_SEL_POS 16
+#define R_COMP_SEL_MASK GENMASK(17, 16)
+#define A_COMP_SEL_POS 18
+#define A_COMP_SEL_MASK GENMASK(19, 18)
+#define DCSS_DPR_FRAME_CTRL0 0x070
+#define HFLIP_EN BIT(0)
+#define VFLIP_EN BIT(1)
+#define ROT_ENC_POS 2
+#define ROT_ENC_MASK GENMASK(3, 2)
+#define ROT_FLIP_ORDER_EN BIT(4)
+#define PITCH_POS 16
+#define PITCH_MASK GENMASK(31, 16)
+#define DCSS_DPR_FRAME_1P_CTRL0 0x090
+#define DCSS_DPR_FRAME_1P_PIX_X_CTRL 0x0A0
+#define DCSS_DPR_FRAME_1P_PIX_Y_CTRL 0x0B0
+#define DCSS_DPR_FRAME_1P_BASE_ADDR 0x0C0
+#define DCSS_DPR_FRAME_2P_CTRL0 0x0E0
+#define DCSS_DPR_FRAME_2P_PIX_X_CTRL 0x0F0
+#define DCSS_DPR_FRAME_2P_PIX_Y_CTRL 0x100
+#define DCSS_DPR_FRAME_2P_BASE_ADDR 0x110
+#define DCSS_DPR_STATUS_CTRL0 0x130
+#define STATUS_MUX_SEL_MASK GENMASK(2, 0)
+#define STATUS_SRC_SEL_POS 16
+#define STATUS_SRC_SEL_MASK GENMASK(18, 16)
+#define DCSS_DPR_STATUS_CTRL1 0x140
+#define DCSS_DPR_RTRAM_CTRL0 0x200
+#define NUM_ROWS_ACTIVE BIT(0)
+#define THRES_HIGH_POS 1
+#define THRES_HIGH_MASK GENMASK(3, 1)
+#define THRES_LOW_POS 4
+#define THRES_LOW_MASK GENMASK(6, 4)
+#define ABORT_SEL BIT(7)
+
+enum dcss_tile_type {
+ TILE_LINEAR = 0,
+ TILE_GPU_STANDARD,
+ TILE_GPU_SUPER,
+ TILE_VPU_YUV420,
+ TILE_VPU_VP9,
+};
+
+enum dcss_pix_size {
+ PIX_SIZE_8,
+ PIX_SIZE_16,
+ PIX_SIZE_32,
+};
+
+struct dcss_dpr_ch {
+ struct dcss_dpr *dpr;
+ void __iomem *base_reg;
+ u32 base_ofs;
+
+ struct drm_format_info format;
+ enum dcss_pix_size pix_size;
+ enum dcss_tile_type tile;
+ bool rtram_4line_en;
+ bool rtram_3buf_en;
+
+ u32 frame_ctrl;
+ u32 mode_ctrl;
+ u32 sys_ctrl;
+ u32 rtram_ctrl;
+
+ bool sys_ctrl_chgd;
+
+ int ch_num;
+ int irq;
+};
+
+struct dcss_dpr {
+ struct device *dev;
+ struct dcss_ctxld *ctxld;
+ u32 ctx_id;
+
+ struct dcss_dpr_ch ch[3];
+};
+
+static void dcss_dpr_write(struct dcss_dpr_ch *ch, u32 val, u32 ofs)
+{
+ struct dcss_dpr *dpr = ch->dpr;
+
+ dcss_ctxld_write(dpr->ctxld, dpr->ctx_id, val, ch->base_ofs + ofs);
+}
+
+static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
+{
+ struct dcss_dpr_ch *ch;
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ ch = &dpr->ch[i];
+
+ ch->base_ofs = dpr_base + i * 0x1000;
+
+ ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
+ if (!ch->base_reg) {
+ dev_err(dpr->dev, "dpr: unable to remap ch %d base\n",
+ i);
+ return -ENOMEM;
+ }
+
+ ch->dpr = dpr;
+ ch->ch_num = i;
+
+ dcss_writel(0xff, ch->base_reg + DCSS_DPR_IRQ_MASK);
+ }
+
+ return 0;
+}
+
+int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base)
+{
+ struct dcss_dpr *dpr;
+
+ dpr = kzalloc(sizeof(*dpr), GFP_KERNEL);
+ if (!dpr)
+ return -ENOMEM;
+
+ dcss->dpr = dpr;
+ dpr->dev = dcss->dev;
+ dpr->ctxld = dcss->ctxld;
+ dpr->ctx_id = CTX_SB_HP;
+
+ if (dcss_dpr_ch_init_all(dpr, dpr_base)) {
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ if (dpr->ch[i].base_reg)
+ iounmap(dpr->ch[i].base_reg);
+ }
+
+ kfree(dpr);
+
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void dcss_dpr_exit(struct dcss_dpr *dpr)
+{
+ int ch_no;
+
+ /* stop DPR on all channels */
+ for (ch_no = 0; ch_no < 3; ch_no++) {
+ struct dcss_dpr_ch *ch = &dpr->ch[ch_no];
+
+ dcss_writel(0, ch->base_reg + DCSS_DPR_SYSTEM_CTRL0);
+
+ if (ch->base_reg)
+ iounmap(ch->base_reg);
+ }
+
+ kfree(dpr);
+}
+
+static u32 dcss_dpr_x_pix_wide_adjust(struct dcss_dpr_ch *ch, u32 pix_wide,
+ u32 pix_format)
+{
+ u8 pix_in_64byte_map[3][5] = {
+ /* LIN, GPU_STD, GPU_SUP, VPU_YUV420, VPU_VP9 */
+ { 64, 8, 8, 8, 16}, /* PIX_SIZE_8 */
+ { 32, 8, 8, 8, 8}, /* PIX_SIZE_16 */
+ { 16, 4, 4, 8, 8}, /* PIX_SIZE_32 */
+ };
+ u32 offset;
+ u32 div_64byte_mod, pix_in_64byte;
+
+ pix_in_64byte = pix_in_64byte_map[ch->pix_size][ch->tile];
+
+ div_64byte_mod = pix_wide % pix_in_64byte;
+ offset = (div_64byte_mod == 0) ? 0 : (pix_in_64byte - div_64byte_mod);
+
+ return pix_wide + offset;
+}
+
+static u32 dcss_dpr_y_pix_high_adjust(struct dcss_dpr_ch *ch, u32 pix_high,
+ u32 pix_format)
+{
+ u8 num_rows_buf = ch->rtram_4line_en ? 4 : 8;
+ u32 offset, pix_y_mod;
+
+ pix_y_mod = pix_high % num_rows_buf;
+ offset = pix_y_mod ? (num_rows_buf - pix_y_mod) : 0;
+
+ return pix_high + offset;
+}
+
+void dcss_dpr_set_res(struct dcss_dpr *dpr, int ch_num, u32 xres, u32 yres)
+{
+ struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
+ u32 pix_format = ch->format.format;
+ u32 gap = DCSS_DPR_FRAME_2P_BASE_ADDR - DCSS_DPR_FRAME_1P_BASE_ADDR;
+ int plane, max_planes = 1;
+ u32 pix_x_wide, pix_y_high;
+
+ if (pix_format == DRM_FORMAT_NV12 ||
+ pix_format == DRM_FORMAT_NV21)
+ max_planes = 2;
+
+ for (plane = 0; plane < max_planes; plane++) {
+ yres = plane == 1 ? yres >> 1 : yres;
+
+ pix_x_wide = dcss_dpr_x_pix_wide_adjust(ch, xres, pix_format);
+ pix_y_high = dcss_dpr_y_pix_high_adjust(ch, yres, pix_format);
+
+ dcss_dpr_write(ch, pix_x_wide,
+ DCSS_DPR_FRAME_1P_PIX_X_CTRL + plane * gap);
+ dcss_dpr_write(ch, pix_y_high,
+ DCSS_DPR_FRAME_1P_PIX_Y_CTRL + plane * gap);
+
+ dcss_dpr_write(ch, 2, DCSS_DPR_FRAME_1P_CTRL0 + plane * gap);
+ }
+}
+
+void dcss_dpr_addr_set(struct dcss_dpr *dpr, int ch_num, u32 luma_base_addr,
+ u32 chroma_base_addr, u16 pitch)
+{
+ struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
+
+ dcss_dpr_write(ch, luma_base_addr, DCSS_DPR_FRAME_1P_BASE_ADDR);
+
+ dcss_dpr_write(ch, chroma_base_addr, DCSS_DPR_FRAME_2P_BASE_ADDR);
+
+ ch->frame_ctrl &= ~PITCH_MASK;
+ ch->frame_ctrl |= (((u32)pitch << PITCH_POS) & PITCH_MASK);
+}
+
+static void dcss_dpr_argb_comp_sel(struct dcss_dpr_ch *ch, int a_sel, int r_sel,
+ int g_sel, int b_sel)
+{
+ u32 sel;
+
+ sel = ((a_sel << A_COMP_SEL_POS) & A_COMP_SEL_MASK) |
+ ((r_sel << R_COMP_SEL_POS) & R_COMP_SEL_MASK) |
+ ((g_sel << G_COMP_SEL_POS) & G_COMP_SEL_MASK) |
+ ((b_sel << B_COMP_SEL_POS) & B_COMP_SEL_MASK);
+
+ ch->mode_ctrl &= ~(A_COMP_SEL_MASK | R_COMP_SEL_MASK |
+ G_COMP_SEL_MASK | B_COMP_SEL_MASK);
+ ch->mode_ctrl |= sel;
+}
+
+static void dcss_dpr_pix_size_set(struct dcss_dpr_ch *ch,
+ const struct drm_format_info *format)
+{
+ u32 val;
+
+ switch (format->format) {
+ case DRM_FORMAT_NV12:
+ case DRM_FORMAT_NV21:
+ val = PIX_SIZE_8;
+ break;
+
+ case DRM_FORMAT_UYVY:
+ case DRM_FORMAT_VYUY:
+ case DRM_FORMAT_YUYV:
+ case DRM_FORMAT_YVYU:
+ val = PIX_SIZE_16;
+ break;
+
+ default:
+ val = PIX_SIZE_32;
+ break;
+ }
+
+ ch->pix_size = val;
+
+ ch->mode_ctrl &= ~PIX_SIZE_MASK;
+ ch->mode_ctrl |= ((val << PIX_SIZE_POS) & PIX_SIZE_MASK);
+}
+
+static void dcss_dpr_uv_swap(struct dcss_dpr_ch *ch, bool swap)
+{
+ ch->mode_ctrl &= ~PIX_UV_SWAP;
+ ch->mode_ctrl |= (swap ? PIX_UV_SWAP : 0);
+}
+
+static void dcss_dpr_y_uv_swap(struct dcss_dpr_ch *ch, bool swap)
+{
+ ch->mode_ctrl &= ~PIX_LUMA_UV_SWAP;
+ ch->mode_ctrl |= (swap ? PIX_LUMA_UV_SWAP : 0);
+}
+
+static void dcss_dpr_2plane_en(struct dcss_dpr_ch *ch, bool en)
+{
+ ch->mode_ctrl &= ~COMP_2PLANE_EN;
+ ch->mode_ctrl |= (en ? COMP_2PLANE_EN : 0);
+}
+
+static void dcss_dpr_yuv_en(struct dcss_dpr_ch *ch, bool en)
+{
+ ch->mode_ctrl &= ~YUV_EN;
+ ch->mode_ctrl |= (en ? YUV_EN : 0);
+}
+
+void dcss_dpr_enable(struct dcss_dpr *dpr, int ch_num, bool en)
+{
+ struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
+ u32 sys_ctrl;
+
+ sys_ctrl = (en ? REPEAT_EN | RUN_EN : 0);
+
+ if (en) {
+ dcss_dpr_write(ch, ch->mode_ctrl, DCSS_DPR_MODE_CTRL0);
+ dcss_dpr_write(ch, ch->frame_ctrl, DCSS_DPR_FRAME_CTRL0);
+ dcss_dpr_write(ch, ch->rtram_ctrl, DCSS_DPR_RTRAM_CTRL0);
+ }
+
+ if (ch->sys_ctrl != sys_ctrl)
+ ch->sys_ctrl_chgd = true;
+
+ ch->sys_ctrl = sys_ctrl;
+}
+
+struct rgb_comp_sel {
+ u32 drm_format;
+ int a_sel;
+ int r_sel;
+ int g_sel;
+ int b_sel;
+};
+
+static struct rgb_comp_sel comp_sel_map[] = {
+ {DRM_FORMAT_ARGB8888, 3, 2, 1, 0},
+ {DRM_FORMAT_XRGB8888, 3, 2, 1, 0},
+ {DRM_FORMAT_ABGR8888, 3, 0, 1, 2},
+ {DRM_FORMAT_XBGR8888, 3, 0, 1, 2},
+ {DRM_FORMAT_RGBA8888, 0, 3, 2, 1},
+ {DRM_FORMAT_RGBX8888, 0, 3, 2, 1},
+ {DRM_FORMAT_BGRA8888, 0, 1, 2, 3},
+ {DRM_FORMAT_BGRX8888, 0, 1, 2, 3},
+};
+
+static int to_comp_sel(u32 pix_fmt, int *a_sel, int *r_sel, int *g_sel,
+ int *b_sel)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(comp_sel_map); i++) {
+ if (comp_sel_map[i].drm_format == pix_fmt) {
+ *a_sel = comp_sel_map[i].a_sel;
+ *r_sel = comp_sel_map[i].r_sel;
+ *g_sel = comp_sel_map[i].g_sel;
+ *b_sel = comp_sel_map[i].b_sel;
+
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+static void dcss_dpr_rtram_set(struct dcss_dpr_ch *ch, u32 pix_format)
+{
+ u32 val, mask;
+
+ switch (pix_format) {
+ case DRM_FORMAT_NV21:
+ case DRM_FORMAT_NV12:
+ ch->rtram_3buf_en = true;
+ ch->rtram_4line_en = false;
+ break;
+
+ default:
+ ch->rtram_3buf_en = true;
+ ch->rtram_4line_en = true;
+ break;
+ }
+
+ val = (ch->rtram_4line_en ? RTR_4LINE_BUF_EN : 0);
+ val |= (ch->rtram_3buf_en ? RTR_3BUF_EN : 0);
+ mask = RTR_4LINE_BUF_EN | RTR_3BUF_EN;
+
+ ch->mode_ctrl &= ~mask;
+ ch->mode_ctrl |= (val & mask);
+
+ val = (ch->rtram_4line_en ? 0 : NUM_ROWS_ACTIVE);
+ val |= (3 << THRES_LOW_POS) & THRES_LOW_MASK;
+ val |= (4 << THRES_HIGH_POS) & THRES_HIGH_MASK;
+ mask = THRES_LOW_MASK | THRES_HIGH_MASK | NUM_ROWS_ACTIVE;
+
+ ch->rtram_ctrl &= ~mask;
+ ch->rtram_ctrl |= (val & mask);
+}
+
+static void dcss_dpr_setup_components(struct dcss_dpr_ch *ch,
+ const struct drm_format_info *format)
+{
+ int a_sel, r_sel, g_sel, b_sel;
+ bool uv_swap, y_uv_swap;
+
+ switch (format->format) {
+ case DRM_FORMAT_YVYU:
+ uv_swap = true;
+ y_uv_swap = true;
+ break;
+
+ case DRM_FORMAT_VYUY:
+ case DRM_FORMAT_NV21:
+ uv_swap = true;
+ y_uv_swap = false;
+ break;
+
+ case DRM_FORMAT_YUYV:
+ uv_swap = false;
+ y_uv_swap = true;
+ break;
+
+ default:
+ uv_swap = false;
+ y_uv_swap = false;
+ break;
+ }
+
+ dcss_dpr_uv_swap(ch, uv_swap);
+
+ dcss_dpr_y_uv_swap(ch, y_uv_swap);
+
+ if (!format->is_yuv) {
+ if (!to_comp_sel(format->format, &a_sel, &r_sel,
+ &g_sel, &b_sel)) {
+ dcss_dpr_argb_comp_sel(ch, a_sel, r_sel, g_sel, b_sel);
+ } else {
+ dcss_dpr_argb_comp_sel(ch, 3, 2, 1, 0);
+ }
+ } else {
+ dcss_dpr_argb_comp_sel(ch, 0, 0, 0, 0);
+ }
+}
+
+static void dcss_dpr_tile_set(struct dcss_dpr_ch *ch, uint64_t modifier)
+{
+ switch (ch->ch_num) {
+ case 0:
+ switch (modifier) {
+ case DRM_FORMAT_MOD_LINEAR:
+ ch->tile = TILE_LINEAR;
+ break;
+ case DRM_FORMAT_MOD_VIVANTE_TILED:
+ ch->tile = TILE_GPU_STANDARD;
+ break;
+ case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
+ ch->tile = TILE_GPU_SUPER;
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+ break;
+ case 1:
+ case 2:
+ ch->tile = TILE_LINEAR;
+ break;
+ default:
+ WARN_ON(1);
+ return;
+ }
+
+ ch->mode_ctrl &= ~TILE_TYPE_MASK;
+ ch->mode_ctrl |= ((ch->tile << TILE_TYPE_POS) & TILE_TYPE_MASK);
+}
+
+void dcss_dpr_format_set(struct dcss_dpr *dpr, int ch_num,
+ const struct drm_format_info *format, u64 modifier)
+{
+ struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
+
+ ch->format = *format;
+
+ dcss_dpr_yuv_en(ch, format->is_yuv);
+
+ dcss_dpr_pix_size_set(ch, format);
+
+ dcss_dpr_setup_components(ch, format);
+
+ dcss_dpr_2plane_en(ch, format->num_planes == 2);
+
+ dcss_dpr_rtram_set(ch, format->format);
+
+ dcss_dpr_tile_set(ch, modifier);
+}
+
+/* This function will be called from interrupt context. */
+void dcss_dpr_write_sysctrl(struct dcss_dpr *dpr)
+{
+ int chnum;
+
+ dcss_ctxld_assert_locked(dpr->ctxld);
+
+ for (chnum = 0; chnum < 3; chnum++) {
+ struct dcss_dpr_ch *ch = &dpr->ch[chnum];
+
+ if (ch->sys_ctrl_chgd) {
+ dcss_ctxld_write_irqsafe(dpr->ctxld, dpr->ctx_id,
+ ch->sys_ctrl,
+ ch->base_ofs +
+ DCSS_DPR_SYSTEM_CTRL0);
+ ch->sys_ctrl_chgd = false;
+ }
+ }
+}
+
+void dcss_dpr_set_rotation(struct dcss_dpr *dpr, int ch_num, u32 rotation)
+{
+ struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
+
+ ch->frame_ctrl &= ~(HFLIP_EN | VFLIP_EN | ROT_ENC_MASK);
+
+ ch->frame_ctrl |= rotation & DRM_MODE_REFLECT_X ? HFLIP_EN : 0;
+ ch->frame_ctrl |= rotation & DRM_MODE_REFLECT_Y ? VFLIP_EN : 0;
+
+ if (rotation & DRM_MODE_ROTATE_90)
+ ch->frame_ctrl |= 1 << ROT_ENC_POS;
+ else if (rotation & DRM_MODE_ROTATE_180)
+ ch->frame_ctrl |= 2 << ROT_ENC_POS;
+ else if (rotation & DRM_MODE_ROTATE_270)
+ ch->frame_ctrl |= 3 << ROT_ENC_POS;
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-drv.c b/drivers/gpu/drm/imx/dcss/dcss-drv.c
new file mode 100644
index 000000000000..8dc2f85c514b
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-drv.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <drm/drm_of.h>
+
+#include "dcss-dev.h"
+#include "dcss-kms.h"
+
+struct dcss_drv {
+ struct dcss_dev *dcss;
+ struct dcss_kms_dev *kms;
+};
+
+struct dcss_dev *dcss_drv_dev_to_dcss(struct device *dev)
+{
+ struct dcss_drv *mdrv = dev_get_drvdata(dev);
+
+ return mdrv ? mdrv->dcss : NULL;
+}
+
+struct drm_device *dcss_drv_dev_to_drm(struct device *dev)
+{
+ struct dcss_drv *mdrv = dev_get_drvdata(dev);
+
+ return mdrv ? &mdrv->kms->base : NULL;
+}
+
+static int dcss_drv_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *remote;
+ struct dcss_drv *mdrv;
+ int err = 0;
+ bool hdmi_output = true;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ remote = of_graph_get_remote_node(dev->of_node, 0, 0);
+ if (!remote)
+ return -ENODEV;
+
+ hdmi_output = !of_device_is_compatible(remote, "fsl,imx8mq-nwl-dsi");
+
+ of_node_put(remote);
+
+ mdrv = kzalloc(sizeof(*mdrv), GFP_KERNEL);
+ if (!mdrv)
+ return -ENOMEM;
+
+ mdrv->dcss = dcss_dev_create(dev, hdmi_output);
+ if (IS_ERR(mdrv->dcss)) {
+ err = PTR_ERR(mdrv->dcss);
+ goto err;
+ }
+
+ dev_set_drvdata(dev, mdrv);
+
+ mdrv->kms = dcss_kms_attach(mdrv->dcss);
+ if (IS_ERR(mdrv->kms)) {
+ err = PTR_ERR(mdrv->kms);
+ goto dcss_shutoff;
+ }
+
+ return 0;
+
+dcss_shutoff:
+ dcss_dev_destroy(mdrv->dcss);
+
+ dev_set_drvdata(dev, NULL);
+
+err:
+ kfree(mdrv);
+ return err;
+}
+
+static int dcss_drv_platform_remove(struct platform_device *pdev)
+{
+ struct dcss_drv *mdrv = dev_get_drvdata(&pdev->dev);
+
+ if (!mdrv)
+ return 0;
+
+ dcss_kms_detach(mdrv->kms);
+ dcss_dev_destroy(mdrv->dcss);
+
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ kfree(mdrv);
+
+ return 0;
+}
+
+static struct dcss_type_data dcss_types[] = {
+ [DCSS_IMX8MQ] = {
+ .name = "DCSS_IMX8MQ",
+ .blkctl_ofs = 0x2F000,
+ .ctxld_ofs = 0x23000,
+ .dtg_ofs = 0x20000,
+ .scaler_ofs = 0x1C000,
+ .ss_ofs = 0x1B000,
+ .dpr_ofs = 0x18000,
+ },
+};
+
+static const struct of_device_id dcss_of_match[] = {
+ { .compatible = "nxp,imx8mq-dcss", .data = &dcss_types[DCSS_IMX8MQ], },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, dcss_of_match);
+
+static const struct dev_pm_ops dcss_dev_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(dcss_dev_suspend, dcss_dev_resume)
+ SET_RUNTIME_PM_OPS(dcss_dev_runtime_suspend,
+ dcss_dev_runtime_resume, NULL)
+};
+
+static struct platform_driver dcss_platform_driver = {
+ .probe = dcss_drv_platform_probe,
+ .remove = dcss_drv_platform_remove,
+ .driver = {
+ .name = "imx-dcss",
+ .of_match_table = dcss_of_match,
+ .pm = &dcss_dev_pm,
+ },
+};
+
+module_platform_driver(dcss_platform_driver);
+
+MODULE_AUTHOR("Laurentiu Palcu <[email protected]>");
+MODULE_DESCRIPTION("DCSS driver for i.MX8MQ");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/imx/dcss/dcss-dtg.c b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
new file mode 100644
index 000000000000..30de00540f63
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
@@ -0,0 +1,409 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_DTG_TC_CONTROL_STATUS 0x00
+#define CH3_EN BIT(0)
+#define CH2_EN BIT(1)
+#define CH1_EN BIT(2)
+#define OVL_DATA_MODE BIT(3)
+#define BLENDER_VIDEO_ALPHA_SEL BIT(7)
+#define DTG_START BIT(8)
+#define DBY_MODE_EN BIT(9)
+#define CH1_ALPHA_SEL BIT(10)
+#define CSS_PIX_COMP_SWAP_POS 12
+#define CSS_PIX_COMP_SWAP_MASK GENMASK(14, 12)
+#define DEFAULT_FG_ALPHA_POS 24
+#define DEFAULT_FG_ALPHA_MASK GENMASK(31, 24)
+#define DCSS_DTG_TC_DTG 0x04
+#define DCSS_DTG_TC_DISP_TOP 0x08
+#define DCSS_DTG_TC_DISP_BOT 0x0C
+#define DCSS_DTG_TC_CH1_TOP 0x10
+#define DCSS_DTG_TC_CH1_BOT 0x14
+#define DCSS_DTG_TC_CH2_TOP 0x18
+#define DCSS_DTG_TC_CH2_BOT 0x1C
+#define DCSS_DTG_TC_CH3_TOP 0x20
+#define DCSS_DTG_TC_CH3_BOT 0x24
+#define TC_X_POS 0
+#define TC_X_MASK GENMASK(12, 0)
+#define TC_Y_POS 16
+#define TC_Y_MASK GENMASK(28, 16)
+#define DCSS_DTG_TC_CTXLD 0x28
+#define TC_CTXLD_DB_Y_POS 0
+#define TC_CTXLD_DB_Y_MASK GENMASK(12, 0)
+#define TC_CTXLD_SB_Y_POS 16
+#define TC_CTXLD_SB_Y_MASK GENMASK(28, 16)
+#define DCSS_DTG_TC_CH1_BKRND 0x2C
+#define DCSS_DTG_TC_CH2_BKRND 0x30
+#define BKRND_R_Y_COMP_POS 20
+#define BKRND_R_Y_COMP_MASK GENMASK(29, 20)
+#define BKRND_G_U_COMP_POS 10
+#define BKRND_G_U_COMP_MASK GENMASK(19, 10)
+#define BKRND_B_V_COMP_POS 0
+#define BKRND_B_V_COMP_MASK GENMASK(9, 0)
+#define DCSS_DTG_BLENDER_DBY_RANGEINV 0x38
+#define DCSS_DTG_BLENDER_DBY_RANGEMIN 0x3C
+#define DCSS_DTG_BLENDER_DBY_BDP 0x40
+#define DCSS_DTG_BLENDER_BKRND_I 0x44
+#define DCSS_DTG_BLENDER_BKRND_P 0x48
+#define DCSS_DTG_BLENDER_BKRND_T 0x4C
+#define DCSS_DTG_LINE0_INT 0x50
+#define DCSS_DTG_LINE1_INT 0x54
+#define DCSS_DTG_BG_ALPHA_DEFAULT 0x58
+#define DCSS_DTG_INT_STATUS 0x5C
+#define DCSS_DTG_INT_CONTROL 0x60
+#define DCSS_DTG_TC_CH3_BKRND 0x64
+#define DCSS_DTG_INT_MASK 0x68
+#define LINE0_IRQ BIT(0)
+#define LINE1_IRQ BIT(1)
+#define LINE2_IRQ BIT(2)
+#define LINE3_IRQ BIT(3)
+#define DCSS_DTG_LINE2_INT 0x6C
+#define DCSS_DTG_LINE3_INT 0x70
+#define DCSS_DTG_DBY_OL 0x74
+#define DCSS_DTG_DBY_BL 0x78
+#define DCSS_DTG_DBY_EL 0x7C
+
+struct dcss_dtg {
+ struct device *dev;
+ struct dcss_ctxld *ctxld;
+ void __iomem *base_reg;
+ u32 base_ofs;
+
+ u32 ctx_id;
+
+ bool in_use;
+
+ u32 dis_ulc_x;
+ u32 dis_ulc_y;
+
+ u32 control_status;
+ u32 alpha;
+ u32 alpha_cfg;
+
+ int ctxld_kick_irq;
+ bool ctxld_kick_irq_en;
+};
+
+static void dcss_dtg_write(struct dcss_dtg *dtg, u32 val, u32 ofs)
+{
+ if (!dtg->in_use)
+ dcss_writel(val, dtg->base_reg + ofs);
+
+ dcss_ctxld_write(dtg->ctxld, dtg->ctx_id,
+ val, dtg->base_ofs + ofs);
+}
+
+static irqreturn_t dcss_dtg_irq_handler(int irq, void *data)
+{
+ struct dcss_dtg *dtg = data;
+ u32 status;
+
+ status = dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS);
+
+ if (!(status & LINE0_IRQ))
+ return IRQ_NONE;
+
+ dcss_ctxld_kick(dtg->ctxld);
+
+ dcss_writel(status & LINE0_IRQ, dtg->base_reg + DCSS_DTG_INT_CONTROL);
+
+ return IRQ_HANDLED;
+}
+
+static int dcss_dtg_irq_config(struct dcss_dtg *dtg,
+ struct platform_device *pdev)
+{
+ int ret;
+
+ dtg->ctxld_kick_irq = platform_get_irq_byname(pdev, "ctxld_kick");
+ if (dtg->ctxld_kick_irq < 0)
+ return dtg->ctxld_kick_irq;
+
+ dcss_update(0, LINE0_IRQ | LINE1_IRQ,
+ dtg->base_reg + DCSS_DTG_INT_MASK);
+
+ ret = request_irq(dtg->ctxld_kick_irq, dcss_dtg_irq_handler,
+ 0, "dcss_ctxld_kick", dtg);
+ if (ret) {
+ dev_err(dtg->dev, "dtg: irq request failed.\n");
+ return ret;
+ }
+
+ disable_irq(dtg->ctxld_kick_irq);
+
+ dtg->ctxld_kick_irq_en = false;
+
+ return 0;
+}
+
+int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
+{
+ int ret = 0;
+ struct dcss_dtg *dtg;
+
+ dtg = kzalloc(sizeof(*dtg), GFP_KERNEL);
+ if (!dtg)
+ return -ENOMEM;
+
+ dcss->dtg = dtg;
+ dtg->dev = dcss->dev;
+ dtg->ctxld = dcss->ctxld;
+
+ dtg->base_reg = ioremap(dtg_base, SZ_4K);
+ if (!dtg->base_reg) {
+ dev_err(dcss->dev, "dtg: unable to remap dtg base\n");
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ dtg->base_ofs = dtg_base;
+ dtg->ctx_id = CTX_DB;
+
+ dtg->alpha = 255;
+
+ dtg->control_status |= OVL_DATA_MODE | BLENDER_VIDEO_ALPHA_SEL |
+ ((dtg->alpha << DEFAULT_FG_ALPHA_POS) & DEFAULT_FG_ALPHA_MASK);
+
+ ret = dcss_dtg_irq_config(dtg, to_platform_device(dcss->dev));
+ if (ret)
+ goto err_irq;
+
+ return 0;
+
+err_irq:
+ iounmap(dtg->base_reg);
+
+err_ioremap:
+ kfree(dtg);
+
+ return ret;
+}
+
+void dcss_dtg_exit(struct dcss_dtg *dtg)
+{
+ free_irq(dtg->ctxld_kick_irq, dtg);
+
+ if (dtg->base_reg)
+ iounmap(dtg->base_reg);
+
+ kfree(dtg);
+}
+
+void dcss_dtg_sync_set(struct dcss_dtg *dtg, struct videomode *vm)
+{
+ struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dtg->dev);
+ u16 dtg_lrc_x, dtg_lrc_y;
+ u16 dis_ulc_x, dis_ulc_y;
+ u16 dis_lrc_x, dis_lrc_y;
+ u32 sb_ctxld_trig, db_ctxld_trig;
+ u32 pixclock = vm->pixelclock;
+ u32 actual_clk;
+
+ dtg_lrc_x = vm->hfront_porch + vm->hback_porch + vm->hsync_len +
+ vm->hactive - 1;
+ dtg_lrc_y = vm->vfront_porch + vm->vback_porch + vm->vsync_len +
+ vm->vactive - 1;
+ dis_ulc_x = vm->hsync_len + vm->hback_porch - 1;
+ dis_ulc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch - 1;
+ dis_lrc_x = vm->hsync_len + vm->hback_porch + vm->hactive - 1;
+ dis_lrc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch +
+ vm->vactive - 1;
+
+ clk_disable_unprepare(dcss->pix_clk);
+ clk_set_rate(dcss->pix_clk, vm->pixelclock);
+ clk_prepare_enable(dcss->pix_clk);
+
+ actual_clk = clk_get_rate(dcss->pix_clk);
+ if (pixclock != actual_clk) {
+ dev_info(dtg->dev,
+ "Pixel clock set to %u kHz instead of %u kHz.\n",
+ (actual_clk / 1000), (pixclock / 1000));
+ }
+
+ dcss_dtg_write(dtg, ((dtg_lrc_y << TC_Y_POS) | dtg_lrc_x),
+ DCSS_DTG_TC_DTG);
+ dcss_dtg_write(dtg, ((dis_ulc_y << TC_Y_POS) | dis_ulc_x),
+ DCSS_DTG_TC_DISP_TOP);
+ dcss_dtg_write(dtg, ((dis_lrc_y << TC_Y_POS) | dis_lrc_x),
+ DCSS_DTG_TC_DISP_BOT);
+
+ dtg->dis_ulc_x = dis_ulc_x;
+ dtg->dis_ulc_y = dis_ulc_y;
+
+ sb_ctxld_trig = ((0 * dis_lrc_y / 100) << TC_CTXLD_SB_Y_POS) &
+ TC_CTXLD_SB_Y_MASK;
+ db_ctxld_trig = ((99 * dis_lrc_y / 100) << TC_CTXLD_DB_Y_POS) &
+ TC_CTXLD_DB_Y_MASK;
+
+ dcss_dtg_write(dtg, sb_ctxld_trig | db_ctxld_trig, DCSS_DTG_TC_CTXLD);
+
+ /* vblank trigger */
+ dcss_dtg_write(dtg, 0, DCSS_DTG_LINE1_INT);
+
+ /* CTXLD trigger */
+ dcss_dtg_write(dtg, ((90 * dis_lrc_y) / 100) << 16, DCSS_DTG_LINE0_INT);
+}
+
+void dcss_dtg_plane_pos_set(struct dcss_dtg *dtg, int ch_num,
+ int px, int py, int pw, int ph)
+{
+ u16 p_ulc_x, p_ulc_y;
+ u16 p_lrc_x, p_lrc_y;
+
+ p_ulc_x = dtg->dis_ulc_x + px;
+ p_ulc_y = dtg->dis_ulc_y + py;
+ p_lrc_x = p_ulc_x + pw;
+ p_lrc_y = p_ulc_y + ph;
+
+ if (!px && !py && !pw && !ph) {
+ dcss_dtg_write(dtg, 0, DCSS_DTG_TC_CH1_TOP + 0x8 * ch_num);
+ dcss_dtg_write(dtg, 0, DCSS_DTG_TC_CH1_BOT + 0x8 * ch_num);
+ } else {
+ dcss_dtg_write(dtg, ((p_ulc_y << TC_Y_POS) | p_ulc_x),
+ DCSS_DTG_TC_CH1_TOP + 0x8 * ch_num);
+ dcss_dtg_write(dtg, ((p_lrc_y << TC_Y_POS) | p_lrc_x),
+ DCSS_DTG_TC_CH1_BOT + 0x8 * ch_num);
+ }
+}
+
+bool dcss_dtg_global_alpha_changed(struct dcss_dtg *dtg, int ch_num, int alpha)
+{
+ if (ch_num)
+ return false;
+
+ return alpha != dtg->alpha;
+}
+
+void dcss_dtg_plane_alpha_set(struct dcss_dtg *dtg, int ch_num,
+ const struct drm_format_info *format, int alpha)
+{
+ /* we care about alpha only when channel 0 is concerned */
+ if (ch_num)
+ return;
+
+ /*
+ * Use global alpha if pixel format does not have alpha channel or the
+ * user explicitly chose to use global alpha (i.e. alpha is not OPAQUE).
+ */
+ if (!format->has_alpha || alpha != 255)
+ dtg->alpha_cfg = (alpha << DEFAULT_FG_ALPHA_POS) & DEFAULT_FG_ALPHA_MASK;
+ else /* use per-pixel alpha otherwise */
+ dtg->alpha_cfg = CH1_ALPHA_SEL;
+
+ dtg->alpha = alpha;
+}
+
+void dcss_dtg_css_set(struct dcss_dtg *dtg)
+{
+ dtg->control_status |=
+ (0x5 << CSS_PIX_COMP_SWAP_POS) & CSS_PIX_COMP_SWAP_MASK;
+}
+
+void dcss_dtg_enable(struct dcss_dtg *dtg)
+{
+ dtg->control_status |= DTG_START;
+
+ dtg->control_status &= ~(CH1_ALPHA_SEL | DEFAULT_FG_ALPHA_MASK);
+ dtg->control_status |= dtg->alpha_cfg;
+
+ dcss_dtg_write(dtg, dtg->control_status, DCSS_DTG_TC_CONTROL_STATUS);
+
+ dtg->in_use = true;
+}
+
+void dcss_dtg_shutoff(struct dcss_dtg *dtg)
+{
+ dtg->control_status &= ~DTG_START;
+
+ dcss_writel(dtg->control_status,
+ dtg->base_reg + DCSS_DTG_TC_CONTROL_STATUS);
+
+ dtg->in_use = false;
+}
+
+bool dcss_dtg_is_enabled(struct dcss_dtg *dtg)
+{
+ return dtg->in_use;
+}
+
+void dcss_dtg_ch_enable(struct dcss_dtg *dtg, int ch_num, bool en)
+{
+ u32 ch_en_map[] = {CH1_EN, CH2_EN, CH3_EN};
+ u32 control_status;
+
+ control_status = dtg->control_status & ~ch_en_map[ch_num];
+ control_status |= en ? ch_en_map[ch_num] : 0;
+
+ control_status &= ~(CH1_ALPHA_SEL | DEFAULT_FG_ALPHA_MASK);
+ control_status |= dtg->alpha_cfg;
+
+ if (dtg->control_status != control_status)
+ dcss_dtg_write(dtg, control_status, DCSS_DTG_TC_CONTROL_STATUS);
+
+ dtg->control_status = control_status;
+}
+
+void dcss_dtg_vblank_irq_enable(struct dcss_dtg *dtg, bool en)
+{
+ u32 status;
+ u32 mask = en ? LINE1_IRQ : 0;
+
+ if (en) {
+ status = dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS);
+ dcss_writel(status & LINE1_IRQ,
+ dtg->base_reg + DCSS_DTG_INT_CONTROL);
+ }
+
+ dcss_update(mask, LINE1_IRQ, dtg->base_reg + DCSS_DTG_INT_MASK);
+}
+
+void dcss_dtg_ctxld_kick_irq_enable(struct dcss_dtg *dtg, bool en)
+{
+ u32 status;
+ u32 mask = en ? LINE0_IRQ : 0;
+
+ if (en) {
+ status = dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS);
+
+ if (!dtg->ctxld_kick_irq_en) {
+ dcss_writel(status & LINE0_IRQ,
+ dtg->base_reg + DCSS_DTG_INT_CONTROL);
+ enable_irq(dtg->ctxld_kick_irq);
+ dtg->ctxld_kick_irq_en = true;
+ dcss_update(mask, LINE0_IRQ,
+ dtg->base_reg + DCSS_DTG_INT_MASK);
+ }
+
+ return;
+ }
+
+ if (!dtg->ctxld_kick_irq_en)
+ return;
+
+ disable_irq_nosync(dtg->ctxld_kick_irq);
+ dtg->ctxld_kick_irq_en = false;
+
+ dcss_update(mask, LINE0_IRQ, dtg->base_reg + DCSS_DTG_INT_MASK);
+}
+
+void dcss_dtg_vblank_irq_clear(struct dcss_dtg *dtg)
+{
+ dcss_update(LINE1_IRQ, LINE1_IRQ, dtg->base_reg + DCSS_DTG_INT_CONTROL);
+}
+
+bool dcss_dtg_vblank_irq_valid(struct dcss_dtg *dtg)
+{
+ return !!(dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS) & LINE1_IRQ);
+}
+
diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.c b/drivers/gpu/drm/imx/dcss/dcss-kms.c
new file mode 100644
index 000000000000..3ca49d0a3e61
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-kms.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "dcss-dev.h"
+#include "dcss-kms.h"
+
+DEFINE_DRM_GEM_CMA_FOPS(dcss_cma_fops);
+
+static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create,
+ .output_poll_changed = drm_fb_helper_output_poll_changed,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static struct drm_driver dcss_kms_driver = {
+ .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+ .gem_free_object_unlocked = drm_gem_cma_free_object,
+ .gem_vm_ops = &drm_gem_cma_vm_ops,
+ .dumb_create = drm_gem_cma_dumb_create,
+
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+ .gem_prime_import = drm_gem_prime_import,
+ .gem_prime_export = drm_gem_prime_export,
+ .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
+ .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+ .gem_prime_vmap = drm_gem_cma_prime_vmap,
+ .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
+ .gem_prime_mmap = drm_gem_cma_prime_mmap,
+ .fops = &dcss_cma_fops,
+ .name = "imx-dcss",
+ .desc = "i.MX8MQ Display Subsystem",
+ .date = "20190917",
+ .major = 1,
+ .minor = 0,
+ .patchlevel = 0,
+};
+
+static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
+ .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
+};
+
+static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
+{
+ struct drm_mode_config *config = &kms->base.mode_config;
+
+ drm_mode_config_init(&kms->base);
+
+ config->min_width = 1;
+ config->min_height = 1;
+ config->max_width = 4096;
+ config->max_height = 4096;
+ config->allow_fb_modifiers = true;
+ config->normalize_zpos = true;
+
+ config->funcs = &dcss_drm_mode_config_funcs;
+ config->helper_private = &dcss_mode_config_helpers;
+}
+
+static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static int dcss_kms_setup_encoder(struct dcss_kms_dev *kms)
+{
+ struct drm_device *ddev = &kms->base;
+ struct drm_encoder *encoder = &kms->encoder;
+ struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc;
+ struct drm_panel *panel;
+ struct drm_bridge *bridge;
+ int ret;
+
+ ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
+ &panel, &bridge);
+ if (ret)
+ return ret;
+
+ if (!bridge) {
+ dev_err(ddev->dev, "No bridge found %d.\n", ret);
+ return -ENODEV;
+ }
+
+ encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+ ret = drm_encoder_init(&kms->base, encoder,
+ &dcss_kms_simple_encoder_funcs,
+ DRM_MODE_ENCODER_NONE, NULL);
+ if (ret) {
+ dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret);
+ return ret;
+ }
+
+ return drm_bridge_attach(encoder, bridge, NULL, 0);
+}
+
+struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
+{
+ struct dcss_kms_dev *kms;
+ struct drm_device *drm;
+ struct dcss_crtc *crtc;
+ int ret;
+
+ kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver,
+ struct dcss_kms_dev, base);
+ if (IS_ERR(kms))
+ return kms;
+
+ drm = &kms->base;
+ crtc = &kms->crtc;
+
+ drm->dev_private = dcss;
+
+ dcss_kms_mode_config_init(kms);
+
+ ret = drm_vblank_init(drm, 1);
+ if (ret)
+ goto cleanup_mode_config;
+
+ drm->irq_enabled = true;
+
+ ret = dcss_crtc_init(crtc, drm);
+ if (ret)
+ goto cleanup_mode_config;
+
+ ret = dcss_kms_setup_encoder(kms);
+ if (ret)
+ goto cleanup_crtc;
+
+ drm_mode_config_reset(drm);
+
+ drm_kms_helper_poll_init(drm);
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ goto cleanup_crtc;
+
+ drm_fbdev_generic_setup(drm, 32);
+
+ return kms;
+
+cleanup_crtc:
+ drm_kms_helper_poll_fini(drm);
+ dcss_crtc_deinit(crtc, drm);
+
+cleanup_mode_config:
+ drm_mode_config_cleanup(drm);
+ drm->dev_private = NULL;
+
+ return ERR_PTR(ret);
+}
+
+void dcss_kms_detach(struct dcss_kms_dev *kms)
+{
+ struct drm_device *drm = &kms->base;
+
+ drm_dev_unregister(drm);
+ drm_kms_helper_poll_fini(drm);
+ drm_atomic_helper_shutdown(drm);
+ drm_crtc_vblank_off(&kms->crtc.base);
+ drm->irq_enabled = false;
+ drm_mode_config_cleanup(drm);
+ dcss_crtc_deinit(&kms->crtc, drm);
+ drm->dev_private = NULL;
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.h b/drivers/gpu/drm/imx/dcss/dcss-kms.h
new file mode 100644
index 000000000000..1f51c86c6986
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-kms.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2019 NXP.
+ */
+
+#ifndef _DCSS_KMS_H_
+#define _DCSS_KMS_H_
+
+#include <drm/drm_encoder.h>
+
+struct dcss_plane {
+ struct drm_plane base;
+
+ int ch_num;
+};
+
+struct dcss_crtc {
+ struct drm_crtc base;
+ struct drm_crtc_state *state;
+
+ struct dcss_plane *plane[3];
+
+ int irq;
+
+ bool disable_ctxld_kick_irq;
+};
+
+struct dcss_kms_dev {
+ struct drm_device base;
+ struct dcss_crtc crtc;
+ struct drm_encoder encoder;
+};
+
+struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss);
+void dcss_kms_detach(struct dcss_kms_dev *kms);
+int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm);
+void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm);
+struct dcss_plane *dcss_plane_init(struct drm_device *drm,
+ unsigned int possible_crtcs,
+ enum drm_plane_type type,
+ unsigned int zpos);
+
+#endif
diff --git a/drivers/gpu/drm/imx/dcss/dcss-plane.c b/drivers/gpu/drm/imx/dcss/dcss-plane.c
new file mode 100644
index 000000000000..961d671f171b
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-plane.c
@@ -0,0 +1,405 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "dcss-dev.h"
+#include "dcss-kms.h"
+
+static const u32 dcss_common_formats[] = {
+ /* RGB */
+ DRM_FORMAT_ARGB8888,
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_ABGR8888,
+ DRM_FORMAT_XBGR8888,
+ DRM_FORMAT_RGBA8888,
+ DRM_FORMAT_RGBX8888,
+ DRM_FORMAT_BGRA8888,
+ DRM_FORMAT_BGRX8888,
+ DRM_FORMAT_XRGB2101010,
+ DRM_FORMAT_XBGR2101010,
+ DRM_FORMAT_RGBX1010102,
+ DRM_FORMAT_BGRX1010102,
+ DRM_FORMAT_ARGB2101010,
+ DRM_FORMAT_ABGR2101010,
+ DRM_FORMAT_RGBA1010102,
+ DRM_FORMAT_BGRA1010102,
+};
+
+static const u64 dcss_video_format_modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID,
+};
+
+static const u64 dcss_graphics_format_modifiers[] = {
+ DRM_FORMAT_MOD_VIVANTE_TILED,
+ DRM_FORMAT_MOD_VIVANTE_SUPER_TILED,
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID,
+};
+
+static inline struct dcss_plane *to_dcss_plane(struct drm_plane *p)
+{
+ return container_of(p, struct dcss_plane, base);
+}
+
+static inline bool dcss_plane_fb_is_linear(const struct drm_framebuffer *fb)
+{
+ return ((fb->flags & DRM_MODE_FB_MODIFIERS) == 0) ||
+ ((fb->flags & DRM_MODE_FB_MODIFIERS) != 0 &&
+ fb->modifier == DRM_FORMAT_MOD_LINEAR);
+}
+
+static void dcss_plane_destroy(struct drm_plane *plane)
+{
+ struct dcss_plane *dcss_plane = container_of(plane, struct dcss_plane,
+ base);
+
+ drm_plane_cleanup(plane);
+ kfree(dcss_plane);
+}
+
+static bool dcss_plane_format_mod_supported(struct drm_plane *plane,
+ u32 format,
+ u64 modifier)
+{
+ switch (plane->type) {
+ case DRM_PLANE_TYPE_PRIMARY:
+ switch (format) {
+ case DRM_FORMAT_ARGB8888:
+ case DRM_FORMAT_XRGB8888:
+ case DRM_FORMAT_ARGB2101010:
+ return modifier == DRM_FORMAT_MOD_LINEAR ||
+ modifier == DRM_FORMAT_MOD_VIVANTE_TILED ||
+ modifier == DRM_FORMAT_MOD_VIVANTE_SUPER_TILED;
+ default:
+ return modifier == DRM_FORMAT_MOD_LINEAR;
+ }
+ break;
+ case DRM_PLANE_TYPE_OVERLAY:
+ return modifier == DRM_FORMAT_MOD_LINEAR;
+ default:
+ return false;
+ }
+}
+
+static const struct drm_plane_funcs dcss_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ .destroy = dcss_plane_destroy,
+ .reset = drm_atomic_helper_plane_reset,
+ .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+ .format_mod_supported = dcss_plane_format_mod_supported,
+};
+
+static bool dcss_plane_can_rotate(const struct drm_format_info *format,
+ bool mod_present, u64 modifier,
+ unsigned int rotation)
+{
+ bool linear_format = !mod_present ||
+ (mod_present && modifier == DRM_FORMAT_MOD_LINEAR);
+ u32 supported_rotation = DRM_MODE_ROTATE_0;
+
+ if (!format->is_yuv && linear_format)
+ supported_rotation = DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
+ DRM_MODE_REFLECT_MASK;
+ else if (!format->is_yuv &&
+ modifier == DRM_FORMAT_MOD_VIVANTE_TILED)
+ supported_rotation = DRM_MODE_ROTATE_MASK |
+ DRM_MODE_REFLECT_MASK;
+ else if (format->is_yuv && linear_format &&
+ (format->format == DRM_FORMAT_NV12 ||
+ format->format == DRM_FORMAT_NV21))
+ supported_rotation = DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
+ DRM_MODE_REFLECT_MASK;
+
+ return !!(rotation & supported_rotation);
+}
+
+static bool dcss_plane_is_source_size_allowed(u16 src_w, u16 src_h, u32 pix_fmt)
+{
+ if (src_w < 64 &&
+ (pix_fmt == DRM_FORMAT_NV12 || pix_fmt == DRM_FORMAT_NV21))
+ return false;
+ else if (src_w < 32 &&
+ (pix_fmt == DRM_FORMAT_UYVY || pix_fmt == DRM_FORMAT_VYUY ||
+ pix_fmt == DRM_FORMAT_YUYV || pix_fmt == DRM_FORMAT_YVYU))
+ return false;
+
+ return src_w >= 16 && src_h >= 8;
+}
+
+static int dcss_plane_atomic_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct dcss_plane *dcss_plane = to_dcss_plane(plane);
+ struct dcss_dev *dcss = plane->dev->dev_private;
+ struct drm_framebuffer *fb = state->fb;
+ bool is_primary_plane = plane->type == DRM_PLANE_TYPE_PRIMARY;
+ struct drm_gem_cma_object *cma_obj;
+ struct drm_crtc_state *crtc_state;
+ int hdisplay, vdisplay;
+ int min, max;
+ int ret;
+
+ if (!fb || !state->crtc)
+ return 0;
+
+ cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+ WARN_ON(!cma_obj);
+
+ crtc_state = drm_atomic_get_existing_crtc_state(state->state,
+ state->crtc);
+
+ hdisplay = crtc_state->adjusted_mode.hdisplay;
+ vdisplay = crtc_state->adjusted_mode.vdisplay;
+
+ if (!dcss_plane_is_source_size_allowed(state->src_w >> 16,
+ state->src_h >> 16,
+ fb->format->format)) {
+ DRM_DEBUG_KMS("Source plane size is not allowed!\n");
+ return -EINVAL;
+ }
+
+ dcss_scaler_get_min_max_ratios(dcss->scaler, dcss_plane->ch_num,
+ &min, &max);
+
+ ret = drm_atomic_helper_check_plane_state(state, crtc_state,
+ min, max, !is_primary_plane,
+ false);
+ if (ret)
+ return ret;
+
+ if (!state->visible)
+ return 0;
+
+ if (!dcss_plane_can_rotate(fb->format,
+ !!(fb->flags & DRM_MODE_FB_MODIFIERS),
+ fb->modifier,
+ state->rotation)) {
+ DRM_DEBUG_KMS("requested rotation is not allowed!\n");
+ return -EINVAL;
+ }
+
+ if ((state->crtc_x < 0 || state->crtc_y < 0 ||
+ state->crtc_x + state->crtc_w > hdisplay ||
+ state->crtc_y + state->crtc_h > vdisplay) &&
+ !dcss_plane_fb_is_linear(fb)) {
+ DRM_DEBUG_KMS("requested cropping operation is not allowed!\n");
+ return -EINVAL;
+ }
+
+ if ((fb->flags & DRM_MODE_FB_MODIFIERS) &&
+ !plane->funcs->format_mod_supported(plane,
+ fb->format->format,
+ fb->modifier)) {
+ DRM_DEBUG_KMS("Invalid modifier: %llx", fb->modifier);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void dcss_plane_atomic_set_base(struct dcss_plane *dcss_plane)
+{
+ struct drm_plane *plane = &dcss_plane->base;
+ struct drm_plane_state *state = plane->state;
+ struct dcss_dev *dcss = plane->dev->dev_private;
+ struct drm_framebuffer *fb = state->fb;
+ const struct drm_format_info *format = fb->format;
+ struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+ unsigned long p1_ba = 0, p2_ba = 0;
+
+ if (!format->is_yuv ||
+ format->format == DRM_FORMAT_NV12 ||
+ format->format == DRM_FORMAT_NV21)
+ p1_ba = cma_obj->paddr + fb->offsets[0] +
+ fb->pitches[0] * (state->src.y1 >> 16) +
+ format->char_per_block[0] * (state->src.x1 >> 16);
+ else if (format->format == DRM_FORMAT_UYVY ||
+ format->format == DRM_FORMAT_VYUY ||
+ format->format == DRM_FORMAT_YUYV ||
+ format->format == DRM_FORMAT_YVYU)
+ p1_ba = cma_obj->paddr + fb->offsets[0] +
+ fb->pitches[0] * (state->src.y1 >> 16) +
+ 2 * format->char_per_block[0] * (state->src.x1 >> 17);
+
+ if (format->format == DRM_FORMAT_NV12 ||
+ format->format == DRM_FORMAT_NV21)
+ p2_ba = cma_obj->paddr + fb->offsets[1] +
+ (((fb->pitches[1] >> 1) * (state->src.y1 >> 17) +
+ (state->src.x1 >> 17)) << 1);
+
+ dcss_dpr_addr_set(dcss->dpr, dcss_plane->ch_num, p1_ba, p2_ba,
+ fb->pitches[0]);
+}
+
+static bool dcss_plane_needs_setup(struct drm_plane_state *state,
+ struct drm_plane_state *old_state)
+{
+ struct drm_framebuffer *fb = state->fb;
+ struct drm_framebuffer *old_fb = old_state->fb;
+
+ return state->crtc_x != old_state->crtc_x ||
+ state->crtc_y != old_state->crtc_y ||
+ state->crtc_w != old_state->crtc_w ||
+ state->crtc_h != old_state->crtc_h ||
+ state->src_x != old_state->src_x ||
+ state->src_y != old_state->src_y ||
+ state->src_w != old_state->src_w ||
+ state->src_h != old_state->src_h ||
+ fb->format->format != old_fb->format->format ||
+ fb->modifier != old_fb->modifier ||
+ state->rotation != old_state->rotation;
+}
+
+static void dcss_plane_atomic_update(struct drm_plane *plane,
+ struct drm_plane_state *old_state)
+{
+ struct drm_plane_state *state = plane->state;
+ struct dcss_plane *dcss_plane = to_dcss_plane(plane);
+ struct dcss_dev *dcss = plane->dev->dev_private;
+ struct drm_framebuffer *fb = state->fb;
+ u32 pixel_format;
+ struct drm_crtc_state *crtc_state;
+ bool modifiers_present;
+ u32 src_w, src_h, dst_w, dst_h;
+ struct drm_rect src, dst;
+ bool enable = true;
+
+ if (!fb || !state->crtc || !state->visible)
+ return;
+
+ pixel_format = state->fb->format->format;
+ crtc_state = state->crtc->state;
+ modifiers_present = !!(fb->flags & DRM_MODE_FB_MODIFIERS);
+
+ if (old_state->fb && !drm_atomic_crtc_needs_modeset(crtc_state) &&
+ !dcss_plane_needs_setup(state, old_state)) {
+ dcss_plane_atomic_set_base(dcss_plane);
+ return;
+ }
+
+ src = plane->state->src;
+ dst = plane->state->dst;
+
+ /*
+ * The width and height after clipping.
+ */
+ src_w = drm_rect_width(&src) >> 16;
+ src_h = drm_rect_height(&src) >> 16;
+ dst_w = drm_rect_width(&dst);
+ dst_h = drm_rect_height(&dst);
+
+ if (plane->type == DRM_PLANE_TYPE_OVERLAY &&
+ modifiers_present && fb->modifier == DRM_FORMAT_MOD_LINEAR)
+ modifiers_present = false;
+
+ dcss_dpr_format_set(dcss->dpr, dcss_plane->ch_num, state->fb->format,
+ modifiers_present ? fb->modifier :
+ DRM_FORMAT_MOD_LINEAR);
+ dcss_dpr_set_res(dcss->dpr, dcss_plane->ch_num, src_w, src_h);
+ dcss_dpr_set_rotation(dcss->dpr, dcss_plane->ch_num,
+ state->rotation);
+
+ dcss_plane_atomic_set_base(dcss_plane);
+
+ dcss_scaler_setup(dcss->scaler, dcss_plane->ch_num,
+ state->fb->format, src_w, src_h,
+ dst_w, dst_h,
+ drm_mode_vrefresh(&crtc_state->mode));
+
+ dcss_dtg_plane_pos_set(dcss->dtg, dcss_plane->ch_num,
+ dst.x1, dst.y1, dst_w, dst_h);
+ dcss_dtg_plane_alpha_set(dcss->dtg, dcss_plane->ch_num,
+ fb->format, state->alpha >> 8);
+
+ if (!dcss_plane->ch_num && (state->alpha >> 8) == 0)
+ enable = false;
+
+ dcss_dpr_enable(dcss->dpr, dcss_plane->ch_num, enable);
+ dcss_scaler_ch_enable(dcss->scaler, dcss_plane->ch_num, enable);
+
+ if (!enable)
+ dcss_dtg_plane_pos_set(dcss->dtg, dcss_plane->ch_num,
+ 0, 0, 0, 0);
+
+ dcss_dtg_ch_enable(dcss->dtg, dcss_plane->ch_num, enable);
+}
+
+static void dcss_plane_atomic_disable(struct drm_plane *plane,
+ struct drm_plane_state *old_state)
+{
+ struct dcss_plane *dcss_plane = to_dcss_plane(plane);
+ struct dcss_dev *dcss = plane->dev->dev_private;
+
+ dcss_dpr_enable(dcss->dpr, dcss_plane->ch_num, false);
+ dcss_scaler_ch_enable(dcss->scaler, dcss_plane->ch_num, false);
+ dcss_dtg_plane_pos_set(dcss->dtg, dcss_plane->ch_num, 0, 0, 0, 0);
+ dcss_dtg_ch_enable(dcss->dtg, dcss_plane->ch_num, false);
+}
+
+static const struct drm_plane_helper_funcs dcss_plane_helper_funcs = {
+ .prepare_fb = drm_gem_fb_prepare_fb,
+ .atomic_check = dcss_plane_atomic_check,
+ .atomic_update = dcss_plane_atomic_update,
+ .atomic_disable = dcss_plane_atomic_disable,
+};
+
+struct dcss_plane *dcss_plane_init(struct drm_device *drm,
+ unsigned int possible_crtcs,
+ enum drm_plane_type type,
+ unsigned int zpos)
+{
+ struct dcss_plane *dcss_plane;
+ const u64 *format_modifiers = dcss_video_format_modifiers;
+ int ret;
+
+ if (zpos > 2)
+ return ERR_PTR(-EINVAL);
+
+ dcss_plane = kzalloc(sizeof(*dcss_plane), GFP_KERNEL);
+ if (!dcss_plane) {
+ DRM_ERROR("failed to allocate plane\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ if (type == DRM_PLANE_TYPE_PRIMARY)
+ format_modifiers = dcss_graphics_format_modifiers;
+
+ ret = drm_universal_plane_init(drm, &dcss_plane->base, possible_crtcs,
+ &dcss_plane_funcs, dcss_common_formats,
+ ARRAY_SIZE(dcss_common_formats),
+ format_modifiers, type, NULL);
+ if (ret) {
+ DRM_ERROR("failed to initialize plane\n");
+ kfree(dcss_plane);
+ return ERR_PTR(ret);
+ }
+
+ drm_plane_helper_add(&dcss_plane->base, &dcss_plane_helper_funcs);
+
+ ret = drm_plane_create_zpos_immutable_property(&dcss_plane->base, zpos);
+ if (ret)
+ return ERR_PTR(ret);
+
+ drm_plane_create_rotation_property(&dcss_plane->base,
+ DRM_MODE_ROTATE_0,
+ DRM_MODE_ROTATE_0 |
+ DRM_MODE_ROTATE_90 |
+ DRM_MODE_ROTATE_180 |
+ DRM_MODE_ROTATE_270 |
+ DRM_MODE_REFLECT_X |
+ DRM_MODE_REFLECT_Y);
+
+ dcss_plane->ch_num = zpos;
+
+ return dcss_plane;
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-scaler.c b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
new file mode 100644
index 000000000000..cd21905de580
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
@@ -0,0 +1,826 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ *
+ * Scaling algorithms were contributed by Dzung Hoang <[email protected]>
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_SCALER_CTRL 0x00
+#define SCALER_EN BIT(0)
+#define REPEAT_EN BIT(4)
+#define SCALE2MEM_EN BIT(8)
+#define MEM2OFIFO_EN BIT(12)
+#define DCSS_SCALER_OFIFO_CTRL 0x04
+#define OFIFO_LOW_THRES_POS 0
+#define OFIFO_LOW_THRES_MASK GENMASK(9, 0)
+#define OFIFO_HIGH_THRES_POS 16
+#define OFIFO_HIGH_THRES_MASK GENMASK(25, 16)
+#define UNDERRUN_DETECT_CLR BIT(26)
+#define LOW_THRES_DETECT_CLR BIT(27)
+#define HIGH_THRES_DETECT_CLR BIT(28)
+#define UNDERRUN_DETECT_EN BIT(29)
+#define LOW_THRES_DETECT_EN BIT(30)
+#define HIGH_THRES_DETECT_EN BIT(31)
+#define DCSS_SCALER_SDATA_CTRL 0x08
+#define YUV_EN BIT(0)
+#define RTRAM_8LINES BIT(1)
+#define Y_UV_BYTE_SWAP BIT(4)
+#define A2R10G10B10_FORMAT_POS 8
+#define A2R10G10B10_FORMAT_MASK GENMASK(11, 8)
+#define DCSS_SCALER_BIT_DEPTH 0x0C
+#define LUM_BIT_DEPTH_POS 0
+#define LUM_BIT_DEPTH_MASK GENMASK(1, 0)
+#define CHR_BIT_DEPTH_POS 4
+#define CHR_BIT_DEPTH_MASK GENMASK(5, 4)
+#define DCSS_SCALER_SRC_FORMAT 0x10
+#define DCSS_SCALER_DST_FORMAT 0x14
+#define FORMAT_MASK GENMASK(1, 0)
+#define DCSS_SCALER_SRC_LUM_RES 0x18
+#define DCSS_SCALER_SRC_CHR_RES 0x1C
+#define DCSS_SCALER_DST_LUM_RES 0x20
+#define DCSS_SCALER_DST_CHR_RES 0x24
+#define WIDTH_POS 0
+#define WIDTH_MASK GENMASK(11, 0)
+#define HEIGHT_POS 16
+#define HEIGHT_MASK GENMASK(27, 16)
+#define DCSS_SCALER_V_LUM_START 0x48
+#define V_START_MASK GENMASK(15, 0)
+#define DCSS_SCALER_V_LUM_INC 0x4C
+#define V_INC_MASK GENMASK(15, 0)
+#define DCSS_SCALER_H_LUM_START 0x50
+#define H_START_MASK GENMASK(18, 0)
+#define DCSS_SCALER_H_LUM_INC 0x54
+#define H_INC_MASK GENMASK(15, 0)
+#define DCSS_SCALER_V_CHR_START 0x58
+#define DCSS_SCALER_V_CHR_INC 0x5C
+#define DCSS_SCALER_H_CHR_START 0x60
+#define DCSS_SCALER_H_CHR_INC 0x64
+#define DCSS_SCALER_COEF_VLUM 0x80
+#define DCSS_SCALER_COEF_HLUM 0x140
+#define DCSS_SCALER_COEF_VCHR 0x200
+#define DCSS_SCALER_COEF_HCHR 0x300
+
+struct dcss_scaler_ch {
+ void __iomem *base_reg;
+ u32 base_ofs;
+ struct dcss_scaler *scl;
+
+ u32 sdata_ctrl;
+ u32 scaler_ctrl;
+
+ bool scaler_ctrl_chgd;
+
+ u32 c_vstart;
+ u32 c_hstart;
+};
+
+struct dcss_scaler {
+ struct device *dev;
+
+ struct dcss_ctxld *ctxld;
+ u32 ctx_id;
+
+ struct dcss_scaler_ch ch[3];
+};
+
+/* scaler coefficients generator */
+#define PSC_FRAC_BITS 30
+#define PSC_FRAC_SCALE BIT(PSC_FRAC_BITS)
+#define PSC_BITS_FOR_PHASE 4
+#define PSC_NUM_PHASES 16
+#define PSC_STORED_PHASES (PSC_NUM_PHASES / 2 + 1)
+#define PSC_NUM_TAPS 7
+#define PSC_NUM_TAPS_RGBA 5
+#define PSC_COEFF_PRECISION 10
+#define PSC_PHASE_FRACTION_BITS 13
+#define PSC_PHASE_MASK (PSC_NUM_PHASES - 1)
+#define PSC_Q_FRACTION 19
+#define PSC_Q_ROUND_OFFSET (1 << (PSC_Q_FRACTION - 1))
+
+/**
+ * mult_q() - Performs fixed-point multiplication.
+ * @A: multiplier
+ * @B: multiplicand
+ */
+static int mult_q(int A, int B)
+{
+ int result;
+ s64 temp;
+
+ temp = (int64_t)A * (int64_t)B;
+ temp += PSC_Q_ROUND_OFFSET;
+ result = (int)(temp >> PSC_Q_FRACTION);
+ return result;
+}
+
+/**
+ * div_q() - Performs fixed-point division.
+ * @A: dividend
+ * @B: divisor
+ */
+static int div_q(int A, int B)
+{
+ int result;
+ s64 temp;
+
+ temp = (int64_t)A << PSC_Q_FRACTION;
+ if ((temp >= 0 && B >= 0) || (temp < 0 && B < 0))
+ temp += B / 2;
+ else
+ temp -= B / 2;
+
+ result = (int)(temp / B);
+ return result;
+}
+
+/**
+ * exp_approx_q() - Compute approximation to exp(x) function using Taylor
+ * series.
+ * @x: fixed-point argument of exp function
+ */
+static int exp_approx_q(int x)
+{
+ int sum = 1 << PSC_Q_FRACTION;
+ int term = 1 << PSC_Q_FRACTION;
+
+ term = mult_q(term, div_q(x, 1 << PSC_Q_FRACTION));
+ sum += term;
+ term = mult_q(term, div_q(x, 2 << PSC_Q_FRACTION));
+ sum += term;
+ term = mult_q(term, div_q(x, 3 << PSC_Q_FRACTION));
+ sum += term;
+ term = mult_q(term, div_q(x, 4 << PSC_Q_FRACTION));
+ sum += term;
+
+ return sum;
+}
+
+/**
+ * dcss_scaler_gaussian_filter() - Generate gaussian prototype filter.
+ * @fc_q: fixed-point cutoff frequency normalized to range [0, 1]
+ * @use_5_taps: indicates whether to use 5 taps or 7 taps
+ * @coef: output filter coefficients
+ */
+static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps,
+ bool phase0_identity,
+ int coef[][PSC_NUM_TAPS])
+{
+ int sigma_q, g0_q, g1_q, g2_q;
+ int tap_cnt1, tap_cnt2, tap_idx, phase_cnt;
+ int mid;
+ int phase;
+ int i;
+ int taps;
+
+ if (use_5_taps)
+ for (phase = 0; phase < PSC_STORED_PHASES; phase++) {
+ coef[phase][0] = 0;
+ coef[phase][PSC_NUM_TAPS - 1] = 0;
+ }
+
+ /* seed coefficient scanner */
+ taps = use_5_taps ? PSC_NUM_TAPS_RGBA : PSC_NUM_TAPS;
+ mid = (PSC_NUM_PHASES * taps) / 2 - 1;
+ phase_cnt = (PSC_NUM_PHASES * (PSC_NUM_TAPS + 1)) / 2;
+ tap_cnt1 = (PSC_NUM_PHASES * PSC_NUM_TAPS) / 2;
+ tap_cnt2 = (PSC_NUM_PHASES * PSC_NUM_TAPS) / 2;
+
+ /* seed gaussian filter generator */
+ sigma_q = div_q(PSC_Q_ROUND_OFFSET, fc_q);
+ g0_q = 1 << PSC_Q_FRACTION;
+ g1_q = exp_approx_q(div_q(-PSC_Q_ROUND_OFFSET,
+ mult_q(sigma_q, sigma_q)));
+ g2_q = mult_q(g1_q, g1_q);
+ coef[phase_cnt & PSC_PHASE_MASK][tap_cnt1 >> PSC_BITS_FOR_PHASE] = g0_q;
+
+ for (i = 0; i < mid; i++) {
+ phase_cnt++;
+ tap_cnt1--;
+ tap_cnt2++;
+
+ g0_q = mult_q(g0_q, g1_q);
+ g1_q = mult_q(g1_q, g2_q);
+
+ if ((phase_cnt & PSC_PHASE_MASK) <= 8) {
+ tap_idx = tap_cnt1 >> PSC_BITS_FOR_PHASE;
+ coef[phase_cnt & PSC_PHASE_MASK][tap_idx] = g0_q;
+ }
+ if (((-phase_cnt) & PSC_PHASE_MASK) <= 8) {
+ tap_idx = tap_cnt2 >> PSC_BITS_FOR_PHASE;
+ coef[(-phase_cnt) & PSC_PHASE_MASK][tap_idx] = g0_q;
+ }
+ }
+
+ phase_cnt++;
+ tap_cnt1--;
+ coef[phase_cnt & PSC_PHASE_MASK][tap_cnt1 >> PSC_BITS_FOR_PHASE] = 0;
+
+ /* override phase 0 with identity filter if specified */
+ if (phase0_identity)
+ for (i = 0; i < PSC_NUM_TAPS; i++)
+ coef[0][i] = i == (PSC_NUM_TAPS >> 1) ?
+ (1 << PSC_COEFF_PRECISION) : 0;
+
+ /* normalize coef */
+ for (phase = 0; phase < PSC_STORED_PHASES; phase++) {
+ int sum = 0;
+ s64 ll_temp;
+
+ for (i = 0; i < PSC_NUM_TAPS; i++)
+ sum += coef[phase][i];
+ for (i = 0; i < PSC_NUM_TAPS; i++) {
+ ll_temp = coef[phase][i];
+ ll_temp <<= PSC_COEFF_PRECISION;
+ ll_temp += sum >> 1;
+ ll_temp /= sum;
+ coef[phase][i] = (int)ll_temp;
+ }
+ }
+}
+
+/**
+ * dcss_scaler_filter_design() - Compute filter coefficients using
+ * Gaussian filter.
+ * @src_length: length of input
+ * @dst_length: length of output
+ * @use_5_taps: 0 for 7 taps per phase, 1 for 5 taps
+ * @coef: output coefficients
+ */
+static void dcss_scaler_filter_design(int src_length, int dst_length,
+ bool use_5_taps, bool phase0_identity,
+ int coef[][PSC_NUM_TAPS])
+{
+ int fc_q;
+
+ /* compute cutoff frequency */
+ if (dst_length >= src_length)
+ fc_q = div_q(1, PSC_NUM_PHASES);
+ else
+ fc_q = div_q(dst_length, src_length * PSC_NUM_PHASES);
+
+ /* compute gaussian filter coefficients */
+ dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef);
+}
+
+static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs)
+{
+ struct dcss_scaler *scl = ch->scl;
+
+ dcss_ctxld_write(scl->ctxld, scl->ctx_id, val, ch->base_ofs + ofs);
+}
+
+static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
+ unsigned long scaler_base)
+{
+ struct dcss_scaler_ch *ch;
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ ch = &scl->ch[i];
+
+ ch->base_ofs = scaler_base + i * 0x400;
+
+ ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
+ if (!ch->base_reg) {
+ dev_err(scl->dev, "scaler: unable to remap ch base\n");
+ return -ENOMEM;
+ }
+
+ ch->scl = scl;
+ }
+
+ return 0;
+}
+
+int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
+{
+ struct dcss_scaler *scaler;
+
+ scaler = kzalloc(sizeof(*scaler), GFP_KERNEL);
+ if (!scaler)
+ return -ENOMEM;
+
+ dcss->scaler = scaler;
+ scaler->dev = dcss->dev;
+ scaler->ctxld = dcss->ctxld;
+ scaler->ctx_id = CTX_SB_HP;
+
+ if (dcss_scaler_ch_init_all(scaler, scaler_base)) {
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ if (scaler->ch[i].base_reg)
+ iounmap(scaler->ch[i].base_reg);
+ }
+
+ kfree(scaler);
+
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void dcss_scaler_exit(struct dcss_scaler *scl)
+{
+ int ch_no;
+
+ for (ch_no = 0; ch_no < 3; ch_no++) {
+ struct dcss_scaler_ch *ch = &scl->ch[ch_no];
+
+ dcss_writel(0, ch->base_reg + DCSS_SCALER_CTRL);
+
+ if (ch->base_reg)
+ iounmap(ch->base_reg);
+ }
+
+ kfree(scl);
+}
+
+void dcss_scaler_ch_enable(struct dcss_scaler *scl, int ch_num, bool en)
+{
+ struct dcss_scaler_ch *ch = &scl->ch[ch_num];
+ u32 scaler_ctrl;
+
+ scaler_ctrl = en ? SCALER_EN | REPEAT_EN : 0;
+
+ if (en)
+ dcss_scaler_write(ch, ch->sdata_ctrl, DCSS_SCALER_SDATA_CTRL);
+
+ if (ch->scaler_ctrl != scaler_ctrl)
+ ch->scaler_ctrl_chgd = true;
+
+ ch->scaler_ctrl = scaler_ctrl;
+}
+
+static void dcss_scaler_yuv_enable(struct dcss_scaler_ch *ch, bool en)
+{
+ ch->sdata_ctrl &= ~YUV_EN;
+ ch->sdata_ctrl |= en ? YUV_EN : 0;
+}
+
+static void dcss_scaler_rtr_8lines_enable(struct dcss_scaler_ch *ch, bool en)
+{
+ ch->sdata_ctrl &= ~RTRAM_8LINES;
+ ch->sdata_ctrl |= en ? RTRAM_8LINES : 0;
+}
+
+static void dcss_scaler_bit_depth_set(struct dcss_scaler_ch *ch, int depth)
+{
+ u32 val;
+
+ val = depth == 30 ? 2 : 0;
+
+ dcss_scaler_write(ch,
+ ((val << CHR_BIT_DEPTH_POS) & CHR_BIT_DEPTH_MASK) |
+ ((val << LUM_BIT_DEPTH_POS) & LUM_BIT_DEPTH_MASK),
+ DCSS_SCALER_BIT_DEPTH);
+}
+
+enum buffer_format {
+ BUF_FMT_YUV420,
+ BUF_FMT_YUV422,
+ BUF_FMT_ARGB8888_YUV444,
+};
+
+enum chroma_location {
+ PSC_LOC_HORZ_0_VERT_1_OVER_4 = 0,
+ PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4 = 1,
+ PSC_LOC_HORZ_0_VERT_0 = 2,
+ PSC_LOC_HORZ_1_OVER_4_VERT_0 = 3,
+ PSC_LOC_HORZ_0_VERT_1_OVER_2 = 4,
+ PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2 = 5
+};
+
+static void dcss_scaler_format_set(struct dcss_scaler_ch *ch,
+ enum buffer_format src_fmt,
+ enum buffer_format dst_fmt)
+{
+ dcss_scaler_write(ch, src_fmt, DCSS_SCALER_SRC_FORMAT);
+ dcss_scaler_write(ch, dst_fmt, DCSS_SCALER_DST_FORMAT);
+}
+
+static void dcss_scaler_res_set(struct dcss_scaler_ch *ch,
+ int src_xres, int src_yres,
+ int dst_xres, int dst_yres,
+ u32 pix_format, enum buffer_format dst_format)
+{
+ u32 lsrc_xres, lsrc_yres, csrc_xres, csrc_yres;
+ u32 ldst_xres, ldst_yres, cdst_xres, cdst_yres;
+ bool src_is_444 = true;
+
+ lsrc_xres = src_xres;
+ csrc_xres = src_xres;
+ lsrc_yres = src_yres;
+ csrc_yres = src_yres;
+ ldst_xres = dst_xres;
+ cdst_xres = dst_xres;
+ ldst_yres = dst_yres;
+ cdst_yres = dst_yres;
+
+ if (pix_format == DRM_FORMAT_UYVY || pix_format == DRM_FORMAT_VYUY ||
+ pix_format == DRM_FORMAT_YUYV || pix_format == DRM_FORMAT_YVYU) {
+ csrc_xres >>= 1;
+ src_is_444 = false;
+ } else if (pix_format == DRM_FORMAT_NV12 ||
+ pix_format == DRM_FORMAT_NV21) {
+ csrc_xres >>= 1;
+ csrc_yres >>= 1;
+ src_is_444 = false;
+ }
+
+ if (dst_format == BUF_FMT_YUV422)
+ cdst_xres >>= 1;
+
+ /* for 4:4:4 to 4:2:2 conversion, source height should be 1 less */
+ if (src_is_444 && dst_format == BUF_FMT_YUV422) {
+ lsrc_yres--;
+ csrc_yres--;
+ }
+
+ dcss_scaler_write(ch, (((lsrc_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+ (((lsrc_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+ DCSS_SCALER_SRC_LUM_RES);
+ dcss_scaler_write(ch, (((csrc_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+ (((csrc_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+ DCSS_SCALER_SRC_CHR_RES);
+ dcss_scaler_write(ch, (((ldst_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+ (((ldst_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+ DCSS_SCALER_DST_LUM_RES);
+ dcss_scaler_write(ch, (((cdst_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
+ (((cdst_xres - 1) << WIDTH_POS) & WIDTH_MASK),
+ DCSS_SCALER_DST_CHR_RES);
+}
+
+#define downscale_fp(factor, fp_pos) ((factor) << (fp_pos))
+#define upscale_fp(factor, fp_pos) ((1 << (fp_pos)) / (factor))
+
+struct dcss_scaler_factors {
+ int downscale;
+ int upscale;
+};
+
+static const struct dcss_scaler_factors dcss_scaler_factors[] = {
+ {3, 8}, {5, 8}, {5, 8},
+};
+
+static void dcss_scaler_fractions_set(struct dcss_scaler_ch *ch,
+ int src_xres, int src_yres,
+ int dst_xres, int dst_yres,
+ u32 src_format, u32 dst_format,
+ enum chroma_location src_chroma_loc)
+{
+ int src_c_xres, src_c_yres, dst_c_xres, dst_c_yres;
+ u32 l_vinc, l_hinc, c_vinc, c_hinc;
+ u32 c_vstart, c_hstart;
+
+ src_c_xres = src_xres;
+ src_c_yres = src_yres;
+ dst_c_xres = dst_xres;
+ dst_c_yres = dst_yres;
+
+ c_vstart = 0;
+ c_hstart = 0;
+
+ /* adjustments for source chroma location */
+ if (src_format == BUF_FMT_YUV420) {
+ /* vertical input chroma position adjustment */
+ switch (src_chroma_loc) {
+ case PSC_LOC_HORZ_0_VERT_1_OVER_4:
+ case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4:
+ /*
+ * move chroma up to first luma line
+ * (1/4 chroma input line spacing)
+ */
+ c_vstart -= (1 << (PSC_PHASE_FRACTION_BITS - 2));
+ break;
+ case PSC_LOC_HORZ_0_VERT_1_OVER_2:
+ case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2:
+ /*
+ * move chroma up to first luma line
+ * (1/2 chroma input line spacing)
+ */
+ c_vstart -= (1 << (PSC_PHASE_FRACTION_BITS - 1));
+ break;
+ default:
+ break;
+ }
+ /* horizontal input chroma position adjustment */
+ switch (src_chroma_loc) {
+ case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4:
+ case PSC_LOC_HORZ_1_OVER_4_VERT_0:
+ case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2:
+ /* move chroma left 1/4 chroma input sample spacing */
+ c_hstart -= (1 << (PSC_PHASE_FRACTION_BITS - 2));
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* adjustments to chroma resolution */
+ if (src_format == BUF_FMT_YUV420) {
+ src_c_xres >>= 1;
+ src_c_yres >>= 1;
+ } else if (src_format == BUF_FMT_YUV422) {
+ src_c_xres >>= 1;
+ }
+
+ if (dst_format == BUF_FMT_YUV422)
+ dst_c_xres >>= 1;
+
+ l_vinc = ((src_yres << 13) + (dst_yres >> 1)) / dst_yres;
+ c_vinc = ((src_c_yres << 13) + (dst_c_yres >> 1)) / dst_c_yres;
+ l_hinc = ((src_xres << 13) + (dst_xres >> 1)) / dst_xres;
+ c_hinc = ((src_c_xres << 13) + (dst_c_xres >> 1)) / dst_c_xres;
+
+ /* save chroma start phase */
+ ch->c_vstart = c_vstart;
+ ch->c_hstart = c_hstart;
+
+ dcss_scaler_write(ch, 0, DCSS_SCALER_V_LUM_START);
+ dcss_scaler_write(ch, l_vinc, DCSS_SCALER_V_LUM_INC);
+
+ dcss_scaler_write(ch, 0, DCSS_SCALER_H_LUM_START);
+ dcss_scaler_write(ch, l_hinc, DCSS_SCALER_H_LUM_INC);
+
+ dcss_scaler_write(ch, c_vstart, DCSS_SCALER_V_CHR_START);
+ dcss_scaler_write(ch, c_vinc, DCSS_SCALER_V_CHR_INC);
+
+ dcss_scaler_write(ch, c_hstart, DCSS_SCALER_H_CHR_START);
+ dcss_scaler_write(ch, c_hinc, DCSS_SCALER_H_CHR_INC);
+}
+
+int dcss_scaler_get_min_max_ratios(struct dcss_scaler *scl, int ch_num,
+ int *min, int *max)
+{
+ *min = upscale_fp(dcss_scaler_factors[ch_num].upscale, 16);
+ *max = downscale_fp(dcss_scaler_factors[ch_num].downscale, 16);
+
+ return 0;
+}
+
+static void dcss_scaler_program_5_coef_set(struct dcss_scaler_ch *ch,
+ int base_addr,
+ int coef[][PSC_NUM_TAPS])
+{
+ int i, phase;
+
+ for (i = 0; i < PSC_STORED_PHASES; i++) {
+ dcss_scaler_write(ch, ((coef[i][1] & 0xfff) << 16 |
+ (coef[i][2] & 0xfff) << 4 |
+ (coef[i][3] & 0xf00) >> 8),
+ base_addr + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[i][3] & 0x0ff) << 20 |
+ (coef[i][4] & 0xfff) << 8 |
+ (coef[i][5] & 0xff0) >> 4),
+ base_addr + 0x40 + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[i][5] & 0x00f) << 24),
+ base_addr + 0x80 + i * sizeof(u32));
+ }
+
+ /* reverse both phase and tap orderings */
+ for (phase = (PSC_NUM_PHASES >> 1) - 1;
+ i < PSC_NUM_PHASES; i++, phase--) {
+ dcss_scaler_write(ch, ((coef[phase][5] & 0xfff) << 16 |
+ (coef[phase][4] & 0xfff) << 4 |
+ (coef[phase][3] & 0xf00) >> 8),
+ base_addr + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[phase][3] & 0x0ff) << 20 |
+ (coef[phase][2] & 0xfff) << 8 |
+ (coef[phase][1] & 0xff0) >> 4),
+ base_addr + 0x40 + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[phase][1] & 0x00f) << 24),
+ base_addr + 0x80 + i * sizeof(u32));
+ }
+}
+
+static void dcss_scaler_program_7_coef_set(struct dcss_scaler_ch *ch,
+ int base_addr,
+ int coef[][PSC_NUM_TAPS])
+{
+ int i, phase;
+
+ for (i = 0; i < PSC_STORED_PHASES; i++) {
+ dcss_scaler_write(ch, ((coef[i][0] & 0xfff) << 16 |
+ (coef[i][1] & 0xfff) << 4 |
+ (coef[i][2] & 0xf00) >> 8),
+ base_addr + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[i][2] & 0x0ff) << 20 |
+ (coef[i][3] & 0xfff) << 8 |
+ (coef[i][4] & 0xff0) >> 4),
+ base_addr + 0x40 + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[i][4] & 0x00f) << 24 |
+ (coef[i][5] & 0xfff) << 12 |
+ (coef[i][6] & 0xfff)),
+ base_addr + 0x80 + i * sizeof(u32));
+ }
+
+ /* reverse both phase and tap orderings */
+ for (phase = (PSC_NUM_PHASES >> 1) - 1;
+ i < PSC_NUM_PHASES; i++, phase--) {
+ dcss_scaler_write(ch, ((coef[phase][6] & 0xfff) << 16 |
+ (coef[phase][5] & 0xfff) << 4 |
+ (coef[phase][4] & 0xf00) >> 8),
+ base_addr + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[phase][4] & 0x0ff) << 20 |
+ (coef[phase][3] & 0xfff) << 8 |
+ (coef[phase][2] & 0xff0) >> 4),
+ base_addr + 0x40 + i * sizeof(u32));
+ dcss_scaler_write(ch, ((coef[phase][2] & 0x00f) << 24 |
+ (coef[phase][1] & 0xfff) << 12 |
+ (coef[phase][0] & 0xfff)),
+ base_addr + 0x80 + i * sizeof(u32));
+ }
+}
+
+static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch,
+ enum buffer_format src_format,
+ enum buffer_format dst_format,
+ bool use_5_taps,
+ int src_xres, int src_yres, int dst_xres,
+ int dst_yres)
+{
+ int coef[PSC_STORED_PHASES][PSC_NUM_TAPS];
+ bool program_5_taps = use_5_taps ||
+ (dst_format == BUF_FMT_YUV422 &&
+ src_format == BUF_FMT_ARGB8888_YUV444);
+
+ /* horizontal luma */
+ dcss_scaler_filter_design(src_xres, dst_xres, false,
+ src_xres == dst_xres, coef);
+ dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
+
+ /* vertical luma */
+ dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
+ src_yres == dst_yres, coef);
+
+ if (program_5_taps)
+ dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
+ else
+ dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
+
+ /* adjust chroma resolution */
+ if (src_format != BUF_FMT_ARGB8888_YUV444)
+ src_xres >>= 1;
+ if (src_format == BUF_FMT_YUV420)
+ src_yres >>= 1;
+ if (dst_format != BUF_FMT_ARGB8888_YUV444)
+ dst_xres >>= 1;
+ if (dst_format == BUF_FMT_YUV420) /* should not happen */
+ dst_yres >>= 1;
+
+ /* horizontal chroma */
+ dcss_scaler_filter_design(src_xres, dst_xres, false,
+ (src_xres == dst_xres) && (ch->c_hstart == 0),
+ coef);
+
+ dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HCHR, coef);
+
+ /* vertical chroma */
+ dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
+ (src_yres == dst_yres) && (ch->c_vstart == 0),
+ coef);
+ if (program_5_taps)
+ dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
+ else
+ dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
+}
+
+static void dcss_scaler_rgb_coef_set(struct dcss_scaler_ch *ch,
+ int src_xres, int src_yres, int dst_xres,
+ int dst_yres)
+{
+ int coef[PSC_STORED_PHASES][PSC_NUM_TAPS];
+
+ /* horizontal RGB */
+ dcss_scaler_filter_design(src_xres, dst_xres, false,
+ src_xres == dst_xres, coef);
+ dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
+
+ /* vertical RGB */
+ dcss_scaler_filter_design(src_yres, dst_yres, false,
+ src_yres == dst_yres, coef);
+ dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
+}
+
+static void dcss_scaler_set_rgb10_order(struct dcss_scaler_ch *ch,
+ const struct drm_format_info *format)
+{
+ u32 a2r10g10b10_format;
+
+ if (format->is_yuv)
+ return;
+
+ ch->sdata_ctrl &= ~A2R10G10B10_FORMAT_MASK;
+
+ if (format->depth != 30)
+ return;
+
+ switch (format->format) {
+ case DRM_FORMAT_ARGB2101010:
+ case DRM_FORMAT_XRGB2101010:
+ a2r10g10b10_format = 0;
+ break;
+
+ case DRM_FORMAT_ABGR2101010:
+ case DRM_FORMAT_XBGR2101010:
+ a2r10g10b10_format = 5;
+ break;
+
+ case DRM_FORMAT_RGBA1010102:
+ case DRM_FORMAT_RGBX1010102:
+ a2r10g10b10_format = 6;
+ break;
+
+ case DRM_FORMAT_BGRA1010102:
+ case DRM_FORMAT_BGRX1010102:
+ a2r10g10b10_format = 11;
+ break;
+
+ default:
+ a2r10g10b10_format = 0;
+ break;
+ }
+
+ ch->sdata_ctrl |= a2r10g10b10_format << A2R10G10B10_FORMAT_POS;
+}
+
+void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
+ const struct drm_format_info *format,
+ int src_xres, int src_yres, int dst_xres, int dst_yres,
+ u32 vrefresh_hz)
+{
+ struct dcss_scaler_ch *ch = &scl->ch[ch_num];
+ unsigned int pixel_depth = 0;
+ bool rtr_8line_en = false;
+ bool use_5_taps = false;
+ enum buffer_format src_format = BUF_FMT_ARGB8888_YUV444;
+ enum buffer_format dst_format = BUF_FMT_ARGB8888_YUV444;
+ u32 pix_format = format->format;
+
+ if (format->is_yuv) {
+ dcss_scaler_yuv_enable(ch, true);
+
+ if (pix_format == DRM_FORMAT_NV12 ||
+ pix_format == DRM_FORMAT_NV21) {
+ rtr_8line_en = true;
+ src_format = BUF_FMT_YUV420;
+ } else if (pix_format == DRM_FORMAT_UYVY ||
+ pix_format == DRM_FORMAT_VYUY ||
+ pix_format == DRM_FORMAT_YUYV ||
+ pix_format == DRM_FORMAT_YVYU) {
+ src_format = BUF_FMT_YUV422;
+ }
+
+ use_5_taps = !rtr_8line_en;
+ } else {
+ dcss_scaler_yuv_enable(ch, false);
+
+ pixel_depth = format->depth;
+ }
+
+ dcss_scaler_fractions_set(ch, src_xres, src_yres, dst_xres,
+ dst_yres, src_format, dst_format,
+ PSC_LOC_HORZ_0_VERT_1_OVER_4);
+
+ if (format->is_yuv)
+ dcss_scaler_yuv_coef_set(ch, src_format, dst_format,
+ use_5_taps, src_xres, src_yres,
+ dst_xres, dst_yres);
+ else
+ dcss_scaler_rgb_coef_set(ch, src_xres, src_yres,
+ dst_xres, dst_yres);
+
+ dcss_scaler_rtr_8lines_enable(ch, rtr_8line_en);
+ dcss_scaler_bit_depth_set(ch, pixel_depth);
+ dcss_scaler_set_rgb10_order(ch, format);
+ dcss_scaler_format_set(ch, src_format, dst_format);
+ dcss_scaler_res_set(ch, src_xres, src_yres, dst_xres, dst_yres,
+ pix_format, dst_format);
+}
+
+/* This function will be called from interrupt context. */
+void dcss_scaler_write_sclctrl(struct dcss_scaler *scl)
+{
+ int chnum;
+
+ dcss_ctxld_assert_locked(scl->ctxld);
+
+ for (chnum = 0; chnum < 3; chnum++) {
+ struct dcss_scaler_ch *ch = &scl->ch[chnum];
+
+ if (ch->scaler_ctrl_chgd) {
+ dcss_ctxld_write_irqsafe(scl->ctxld, scl->ctx_id,
+ ch->scaler_ctrl,
+ ch->base_ofs +
+ DCSS_SCALER_CTRL);
+ ch->scaler_ctrl_chgd = false;
+ }
+ }
+}
diff --git a/drivers/gpu/drm/imx/dcss/dcss-ss.c b/drivers/gpu/drm/imx/dcss/dcss-ss.c
new file mode 100644
index 000000000000..8ddf08da911b
--- /dev/null
+++ b/drivers/gpu/drm/imx/dcss/dcss-ss.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include "dcss-dev.h"
+
+#define DCSS_SS_SYS_CTRL 0x00
+#define RUN_EN BIT(0)
+#define DCSS_SS_DISPLAY 0x10
+#define LRC_X_POS 0
+#define LRC_X_MASK GENMASK(12, 0)
+#define LRC_Y_POS 16
+#define LRC_Y_MASK GENMASK(28, 16)
+#define DCSS_SS_HSYNC 0x20
+#define DCSS_SS_VSYNC 0x30
+#define SYNC_START_POS 0
+#define SYNC_START_MASK GENMASK(12, 0)
+#define SYNC_END_POS 16
+#define SYNC_END_MASK GENMASK(28, 16)
+#define SYNC_POL BIT(31)
+#define DCSS_SS_DE_ULC 0x40
+#define ULC_X_POS 0
+#define ULC_X_MASK GENMASK(12, 0)
+#define ULC_Y_POS 16
+#define ULC_Y_MASK GENMASK(28, 16)
+#define ULC_POL BIT(31)
+#define DCSS_SS_DE_LRC 0x50
+#define DCSS_SS_MODE 0x60
+#define PIPE_MODE_POS 0
+#define PIPE_MODE_MASK GENMASK(1, 0)
+#define DCSS_SS_COEFF 0x70
+#define HORIZ_A_POS 0
+#define HORIZ_A_MASK GENMASK(3, 0)
+#define HORIZ_B_POS 4
+#define HORIZ_B_MASK GENMASK(7, 4)
+#define HORIZ_C_POS 8
+#define HORIZ_C_MASK GENMASK(11, 8)
+#define HORIZ_H_NORM_POS 12
+#define HORIZ_H_NORM_MASK GENMASK(14, 12)
+#define VERT_A_POS 16
+#define VERT_A_MASK GENMASK(19, 16)
+#define VERT_B_POS 20
+#define VERT_B_MASK GENMASK(23, 20)
+#define VERT_C_POS 24
+#define VERT_C_MASK GENMASK(27, 24)
+#define VERT_H_NORM_POS 28
+#define VERT_H_NORM_MASK GENMASK(30, 28)
+#define DCSS_SS_CLIP_CB 0x80
+#define DCSS_SS_CLIP_CR 0x90
+#define CLIP_MIN_POS 0
+#define CLIP_MIN_MASK GENMASK(9, 0)
+#define CLIP_MAX_POS 0
+#define CLIP_MAX_MASK GENMASK(23, 16)
+#define DCSS_SS_INTER_MODE 0xA0
+#define INT_EN BIT(0)
+#define VSYNC_SHIFT BIT(1)
+
+struct dcss_ss {
+ struct device *dev;
+ void __iomem *base_reg;
+ u32 base_ofs;
+
+ struct dcss_ctxld *ctxld;
+ u32 ctx_id;
+
+ bool in_use;
+};
+
+static void dcss_ss_write(struct dcss_ss *ss, u32 val, u32 ofs)
+{
+ if (!ss->in_use)
+ dcss_writel(val, ss->base_reg + ofs);
+
+ dcss_ctxld_write(ss->ctxld, ss->ctx_id, val,
+ ss->base_ofs + ofs);
+}
+
+int dcss_ss_init(struct dcss_dev *dcss, unsigned long ss_base)
+{
+ struct dcss_ss *ss;
+
+ ss = kzalloc(sizeof(*ss), GFP_KERNEL);
+ if (!ss)
+ return -ENOMEM;
+
+ dcss->ss = ss;
+ ss->dev = dcss->dev;
+ ss->ctxld = dcss->ctxld;
+
+ ss->base_reg = ioremap(ss_base, SZ_4K);
+ if (!ss->base_reg) {
+ dev_err(dcss->dev, "ss: unable to remap ss base\n");
+ kfree(ss);
+ return -ENOMEM;
+ }
+
+ ss->base_ofs = ss_base;
+ ss->ctx_id = CTX_SB_HP;
+
+ return 0;
+}
+
+void dcss_ss_exit(struct dcss_ss *ss)
+{
+ /* stop SS */
+ dcss_writel(0, ss->base_reg + DCSS_SS_SYS_CTRL);
+
+ if (ss->base_reg)
+ iounmap(ss->base_reg);
+
+ kfree(ss);
+}
+
+void dcss_ss_subsam_set(struct dcss_ss *ss)
+{
+ dcss_ss_write(ss, 0x41614161, DCSS_SS_COEFF);
+ dcss_ss_write(ss, 0, DCSS_SS_MODE);
+ dcss_ss_write(ss, 0x03ff0000, DCSS_SS_CLIP_CB);
+ dcss_ss_write(ss, 0x03ff0000, DCSS_SS_CLIP_CR);
+}
+
+void dcss_ss_sync_set(struct dcss_ss *ss, struct videomode *vm,
+ bool phsync, bool pvsync)
+{
+ u16 lrc_x, lrc_y;
+ u16 hsync_start, hsync_end;
+ u16 vsync_start, vsync_end;
+ u16 de_ulc_x, de_ulc_y;
+ u16 de_lrc_x, de_lrc_y;
+
+ lrc_x = vm->hfront_porch + vm->hback_porch + vm->hsync_len +
+ vm->hactive - 1;
+ lrc_y = vm->vfront_porch + vm->vback_porch + vm->vsync_len +
+ vm->vactive - 1;
+
+ dcss_ss_write(ss, (lrc_y << LRC_Y_POS) | lrc_x, DCSS_SS_DISPLAY);
+
+ hsync_start = vm->hfront_porch + vm->hback_porch + vm->hsync_len +
+ vm->hactive - 1;
+ hsync_end = vm->hsync_len - 1;
+
+ dcss_ss_write(ss, (phsync ? SYNC_POL : 0) |
+ ((u32)hsync_end << SYNC_END_POS) | hsync_start,
+ DCSS_SS_HSYNC);
+
+ vsync_start = vm->vfront_porch - 1;
+ vsync_end = vm->vfront_porch + vm->vsync_len - 1;
+
+ dcss_ss_write(ss, (pvsync ? SYNC_POL : 0) |
+ ((u32)vsync_end << SYNC_END_POS) | vsync_start,
+ DCSS_SS_VSYNC);
+
+ de_ulc_x = vm->hsync_len + vm->hback_porch - 1;
+ de_ulc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch;
+
+ dcss_ss_write(ss, SYNC_POL | ((u32)de_ulc_y << ULC_Y_POS) | de_ulc_x,
+ DCSS_SS_DE_ULC);
+
+ de_lrc_x = vm->hsync_len + vm->hback_porch + vm->hactive - 1;
+ de_lrc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch +
+ vm->vactive - 1;
+
+ dcss_ss_write(ss, (de_lrc_y << LRC_Y_POS) | de_lrc_x, DCSS_SS_DE_LRC);
+}
+
+void dcss_ss_enable(struct dcss_ss *ss)
+{
+ dcss_ss_write(ss, RUN_EN, DCSS_SS_SYS_CTRL);
+ ss->in_use = true;
+}
+
+void dcss_ss_shutoff(struct dcss_ss *ss)
+{
+ dcss_writel(0, ss->base_reg + DCSS_SS_SYS_CTRL);
+ ss->in_use = false;
+}
--
2.23.0

2020-07-29 13:14:33

by Guido Günther

Subject: Re: [PATCH v8 2/5] drm/imx: Add initial support for DCSS on iMX8MQ

Hi Laurentiu,
On Fri, Jul 24, 2020 at 12:07:31PM +0300, Laurentiu Palcu wrote:
> From: Laurentiu Palcu <[email protected]>
>
> This adds initial support for iMX8MQ's Display Controller Subsystem (DCSS).
> Some of its capabilities include:
> * 4K@60fps;
> * HDR10;
> * one graphics and 2 video pipelines;
> * on-the-fly decompression of compressed video and graphics;
>
> The reference manual can be found here:
> https://www.nxp.com/webapp/Download?colCode=IMX8MDQLQRM
>
> The current patch adds only basic functionality: one primary plane for
> graphics, linear, tiled and super-tiled buffers support (no graphics
> decompression yet), no HDR10 and no video planes.
>
> Video planes support and HDR10 will be added in subsequent patches once
> per-plane de-gamma/CSC/gamma support is in.
>
> Signed-off-by: Laurentiu Palcu <[email protected]>
> Reviewed-by: Lucas Stach <[email protected]>
> ---
> drivers/gpu/drm/imx/Kconfig | 2 +
> drivers/gpu/drm/imx/Makefile | 1 +
> drivers/gpu/drm/imx/dcss/Kconfig | 8 +
> drivers/gpu/drm/imx/dcss/Makefile | 6 +
> drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 70 +++
> drivers/gpu/drm/imx/dcss/dcss-crtc.c | 219 +++++++
> drivers/gpu/drm/imx/dcss/dcss-ctxld.c | 424 +++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-dev.c | 314 ++++++++++
> drivers/gpu/drm/imx/dcss/dcss-dev.h | 177 ++++++
> drivers/gpu/drm/imx/dcss/dcss-dpr.c | 562 +++++++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-drv.c | 138 +++++
> drivers/gpu/drm/imx/dcss/dcss-dtg.c | 409 ++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-kms.c | 177 ++++++
> drivers/gpu/drm/imx/dcss/dcss-kms.h | 43 ++
> drivers/gpu/drm/imx/dcss/dcss-plane.c | 405 ++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-scaler.c | 826 +++++++++++++++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-ss.c | 180 ++++++
> 17 files changed, 3961 insertions(+)
> create mode 100644 drivers/gpu/drm/imx/dcss/Kconfig
> create mode 100644 drivers/gpu/drm/imx/dcss/Makefile
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-crtc.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ctxld.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.h
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dpr.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-drv.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dtg.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.h
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-plane.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-scaler.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ss.c
>
> diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
> index 207bf7409dfb..6231048aa5aa 100644
> --- a/drivers/gpu/drm/imx/Kconfig
> +++ b/drivers/gpu/drm/imx/Kconfig
> @@ -39,3 +39,5 @@ config DRM_IMX_HDMI
> depends on DRM_IMX
> help
> Choose this if you want to use HDMI on i.MX6.
> +
> +source "drivers/gpu/drm/imx/dcss/Kconfig"
> diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile
> index 21cdcc2faabc..b644deffe948 100644
> --- a/drivers/gpu/drm/imx/Makefile
> +++ b/drivers/gpu/drm/imx/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
> obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
>
> obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
> +obj-$(CONFIG_DRM_IMX_DCSS) += dcss/
> diff --git a/drivers/gpu/drm/imx/dcss/Kconfig b/drivers/gpu/drm/imx/dcss/Kconfig
> new file mode 100644
> index 000000000000..a76435924b6a
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/Kconfig
> @@ -0,0 +1,8 @@
> +config DRM_IMX_DCSS
> + tristate "i.MX8MQ DCSS"
> + select IMX_IRQSTEER
> + select DRM_KMS_CMA_HELPER
> + depends on DRM && ARCH_MXC

I need a

select VIDEOMODE_HELPERS

here otherwise the build fails like

LD .tmp_vmlinux.kallsyms1
aarch64-linux-gnu-ld: warning: -z norelro ignored
aarch64-linux-gnu-ld: drivers/gpu/drm/imx/dcss/dcss-crtc.o: in function `dcss_crtc_atomic_enable':
dcss-crtc.c:(.text+0x2a8): undefined reference to `drm_display_mode_to_videomode'
make: *** [Makefile:1157: vmlinux] Error 1

on next-20200727.
Cheers,
-- Guido

> + help
> + Choose this if you have a NXP i.MX8MQ based system and want to use the
> + Display Controller Subsystem. This option enables DCSS support.
> diff --git a/drivers/gpu/drm/imx/dcss/Makefile b/drivers/gpu/drm/imx/dcss/Makefile
> new file mode 100644
> index 000000000000..8c7c8da42792
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/Makefile
> @@ -0,0 +1,6 @@
> +imx-dcss-objs := dcss-drv.o dcss-dev.o dcss-blkctl.o dcss-ctxld.o dcss-dtg.o \
> + dcss-ss.o dcss-dpr.o dcss-scaler.o dcss-kms.o dcss-crtc.o \
> + dcss-plane.o
> +
> +obj-$(CONFIG_DRM_IMX_DCSS) += imx-dcss.o
> +
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-blkctl.c b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> new file mode 100644
> index 000000000000..c9b54bb2692d
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> @@ -0,0 +1,70 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/slab.h>
> +
> +#include "dcss-dev.h"
> +
> +#define DCSS_BLKCTL_RESET_CTRL 0x00
> +#define B_CLK_RESETN BIT(0)
> +#define APB_CLK_RESETN BIT(1)
> +#define P_CLK_RESETN BIT(2)
> +#define RTR_CLK_RESETN BIT(4)
> +#define DCSS_BLKCTL_CONTROL0 0x10
> +#define HDMI_MIPI_CLK_SEL BIT(0)
> +#define DISPMIX_REFCLK_SEL_POS 4
> +#define DISPMIX_REFCLK_SEL_MASK GENMASK(5, 4)
> +#define DISPMIX_PIXCLK_SEL BIT(8)
> +#define HDMI_SRC_SECURE_EN BIT(16)
> +
> +struct dcss_blkctl {
> + struct dcss_dev *dcss;
> + void __iomem *base_reg;
> +};
> +
> +void dcss_blkctl_cfg(struct dcss_blkctl *blkctl)
> +{
> + if (blkctl->dcss->hdmi_output)
> + dcss_writel(0, blkctl->base_reg + DCSS_BLKCTL_CONTROL0);
> + else
> + dcss_writel(DISPMIX_PIXCLK_SEL,
> + blkctl->base_reg + DCSS_BLKCTL_CONTROL0);
> +
> + dcss_set(B_CLK_RESETN | APB_CLK_RESETN | P_CLK_RESETN | RTR_CLK_RESETN,
> + blkctl->base_reg + DCSS_BLKCTL_RESET_CTRL);
> +}
> +
> +int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
> +{
> + struct dcss_blkctl *blkctl;
> +
> + blkctl = kzalloc(sizeof(*blkctl), GFP_KERNEL);
> + if (!blkctl)
> + return -ENOMEM;
> +
> + blkctl->base_reg = ioremap(blkctl_base, SZ_4K);
> + if (!blkctl->base_reg) {
> + dev_err(dcss->dev, "unable to remap BLK CTRL base\n");
> + kfree(blkctl);
> + return -ENOMEM;
> + }
> +
> + dcss->blkctl = blkctl;
> + blkctl->dcss = dcss;
> +
> + dcss_blkctl_cfg(blkctl);
> +
> + return 0;
> +}
> +
> +void dcss_blkctl_exit(struct dcss_blkctl *blkctl)
> +{
> + if (blkctl->base_reg)
> + iounmap(blkctl->base_reg);
> +
> + kfree(blkctl);
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-crtc.c b/drivers/gpu/drm/imx/dcss/dcss-crtc.c
> new file mode 100644
> index 000000000000..36abff0890b2
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-crtc.c
> @@ -0,0 +1,219 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_vblank.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +
> +#include "dcss-dev.h"
> +#include "dcss-kms.h"
> +
> +static int dcss_enable_vblank(struct drm_crtc *crtc)
> +{
> + struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
> + base);
> + struct dcss_dev *dcss = crtc->dev->dev_private;
> +
> + dcss_dtg_vblank_irq_enable(dcss->dtg, true);
> +
> + dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
> +
> + enable_irq(dcss_crtc->irq);
> +
> + return 0;
> +}
> +
> +static void dcss_disable_vblank(struct drm_crtc *crtc)
> +{
> + struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
> + base);
> + struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
> +
> + disable_irq_nosync(dcss_crtc->irq);
> +
> + dcss_dtg_vblank_irq_enable(dcss->dtg, false);
> +
> + if (dcss_crtc->disable_ctxld_kick_irq)
> + dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, false);
> +}
> +
> +static const struct drm_crtc_funcs dcss_crtc_funcs = {
> + .set_config = drm_atomic_helper_set_config,
> + .destroy = drm_crtc_cleanup,
> + .page_flip = drm_atomic_helper_page_flip,
> + .reset = drm_atomic_helper_crtc_reset,
> + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> + .enable_vblank = dcss_enable_vblank,
> + .disable_vblank = dcss_disable_vblank,
> +};
> +
> +static void dcss_crtc_atomic_begin(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_crtc_state)
> +{
> + drm_crtc_vblank_on(crtc);
> +}
> +
> +static void dcss_crtc_atomic_flush(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_crtc_state)
> +{
> + struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
> + base);
> + struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
> +
> + spin_lock_irq(&crtc->dev->event_lock);
> + if (crtc->state->event) {
> + WARN_ON(drm_crtc_vblank_get(crtc));
> + drm_crtc_arm_vblank_event(crtc, crtc->state->event);
> + crtc->state->event = NULL;
> + }
> + spin_unlock_irq(&crtc->dev->event_lock);
> +
> + if (dcss_dtg_is_enabled(dcss->dtg))
> + dcss_ctxld_enable(dcss->ctxld);
> +}
> +
> +static void dcss_crtc_atomic_enable(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_crtc_state)
> +{
> + struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
> + base);
> + struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
> + struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> + struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
> + struct videomode vm;
> +
> + drm_display_mode_to_videomode(mode, &vm);
> +
> + pm_runtime_get_sync(dcss->dev);
> +
> + vm.pixelclock = mode->crtc_clock * 1000;
> +
> + dcss_ss_subsam_set(dcss->ss);
> + dcss_dtg_css_set(dcss->dtg);
> +
> + if (!drm_mode_equal(mode, old_mode) || !old_crtc_state->active) {
> + dcss_dtg_sync_set(dcss->dtg, &vm);
> + dcss_ss_sync_set(dcss->ss, &vm,
> + mode->flags & DRM_MODE_FLAG_PHSYNC,
> + mode->flags & DRM_MODE_FLAG_PVSYNC);
> + }
> +
> + dcss_enable_dtg_and_ss(dcss);
> +
> + dcss_ctxld_enable(dcss->ctxld);
> +
> + /* Allow CTXLD kick interrupt to be disabled when VBLANK is disabled. */
> + dcss_crtc->disable_ctxld_kick_irq = true;
> +}
> +
> +static void dcss_crtc_atomic_disable(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_crtc_state)
> +{
> + struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
> + base);
> + struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
> + struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> + struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
> +
> + drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false);
> +
> + spin_lock_irq(&crtc->dev->event_lock);
> + if (crtc->state->event) {
> + drm_crtc_send_vblank_event(crtc, crtc->state->event);
> + crtc->state->event = NULL;
> + }
> + spin_unlock_irq(&crtc->dev->event_lock);
> +
> + dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
> +
> + reinit_completion(&dcss->disable_completion);
> +
> + dcss_disable_dtg_and_ss(dcss);
> +
> + dcss_ctxld_enable(dcss->ctxld);
> +
> + if (!drm_mode_equal(mode, old_mode) || !crtc->state->active)
> + if (!wait_for_completion_timeout(&dcss->disable_completion,
> + msecs_to_jiffies(100)))
> + dev_err(dcss->dev, "Shutting off DTG timed out.\n");
> +
> + /*
> + * Do not shut off CTXLD kick interrupt when shutting VBLANK off. It
> + * will be needed to commit the last changes, before going to suspend.
> + */
> + dcss_crtc->disable_ctxld_kick_irq = false;
> +
> + drm_crtc_vblank_off(crtc);
> +
> + pm_runtime_mark_last_busy(dcss->dev);
> + pm_runtime_put_autosuspend(dcss->dev);
> +}
> +
> +static const struct drm_crtc_helper_funcs dcss_helper_funcs = {
> + .atomic_begin = dcss_crtc_atomic_begin,
> + .atomic_flush = dcss_crtc_atomic_flush,
> + .atomic_enable = dcss_crtc_atomic_enable,
> + .atomic_disable = dcss_crtc_atomic_disable,
> +};
> +
> +static irqreturn_t dcss_crtc_irq_handler(int irq, void *dev_id)
> +{
> + struct dcss_crtc *dcss_crtc = dev_id;
> + struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
> +
> + if (!dcss_dtg_vblank_irq_valid(dcss->dtg))
> + return IRQ_NONE;
> +
> + if (dcss_ctxld_is_flushed(dcss->ctxld))
> + drm_crtc_handle_vblank(&dcss_crtc->base);
> +
> + dcss_dtg_vblank_irq_clear(dcss->dtg);
> +
> + return IRQ_HANDLED;
> +}
> +
> +int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm)
> +{
> + struct dcss_dev *dcss = drm->dev_private;
> + struct platform_device *pdev = to_platform_device(dcss->dev);
> + int ret;
> +
> + crtc->plane[0] = dcss_plane_init(drm, drm_crtc_mask(&crtc->base),
> + DRM_PLANE_TYPE_PRIMARY, 0);
> + if (IS_ERR(crtc->plane[0]))
> + return PTR_ERR(crtc->plane[0]);
> +
> + crtc->base.port = dcss->of_port;
> +
> + drm_crtc_helper_add(&crtc->base, &dcss_helper_funcs);
> + ret = drm_crtc_init_with_planes(drm, &crtc->base, &crtc->plane[0]->base,
> + NULL, &dcss_crtc_funcs, NULL);
> + if (ret) {
> + dev_err(dcss->dev, "failed to init crtc\n");
> + return ret;
> + }
> +
> + crtc->irq = platform_get_irq_byname(pdev, "vblank");
> + if (crtc->irq < 0)
> + return crtc->irq;
> +
> + ret = request_irq(crtc->irq, dcss_crtc_irq_handler,
> + 0, "dcss_drm", crtc);
> + if (ret) {
> + dev_err(dcss->dev, "irq request failed with %d.\n", ret);
> + return ret;
> + }
> +
> + disable_irq(crtc->irq);
> +
> + return 0;
> +}
> +
> +void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm)
> +{
> + free_irq(crtc->irq, crtc);
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
> new file mode 100644
> index 000000000000..3a84cb3209c4
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c
> @@ -0,0 +1,424 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#include "dcss-dev.h"
> +
> +#define DCSS_CTXLD_CONTROL_STATUS 0x0
> +#define CTXLD_ENABLE BIT(0)
> +#define ARB_SEL BIT(1)
> +#define RD_ERR_EN BIT(2)
> +#define DB_COMP_EN BIT(3)
> +#define SB_HP_COMP_EN BIT(4)
> +#define SB_LP_COMP_EN BIT(5)
> +#define DB_PEND_SB_REC_EN BIT(6)
> +#define SB_PEND_DISP_ACTIVE_EN BIT(7)
> +#define AHB_ERR_EN BIT(8)
> +#define RD_ERR BIT(16)
> +#define DB_COMP BIT(17)
> +#define SB_HP_COMP BIT(18)
> +#define SB_LP_COMP BIT(19)
> +#define DB_PEND_SB_REC BIT(20)
> +#define SB_PEND_DISP_ACTIVE BIT(21)
> +#define AHB_ERR BIT(22)
> +#define DCSS_CTXLD_DB_BASE_ADDR 0x10
> +#define DCSS_CTXLD_DB_COUNT 0x14
> +#define DCSS_CTXLD_SB_BASE_ADDR 0x18
> +#define DCSS_CTXLD_SB_COUNT 0x1C
> +#define SB_HP_COUNT_POS 0
> +#define SB_HP_COUNT_MASK 0xffff
> +#define SB_LP_COUNT_POS 16
> +#define SB_LP_COUNT_MASK 0xffff0000
> +#define DCSS_AHB_ERR_ADDR 0x20
> +
> +#define CTXLD_IRQ_COMPLETION (DB_COMP | SB_HP_COMP | SB_LP_COMP)
> +#define CTXLD_IRQ_ERROR (RD_ERR | DB_PEND_SB_REC | AHB_ERR)
> +
> +/* The following sizes are in context loader entries, 8 bytes each. */
> +#define CTXLD_DB_CTX_ENTRIES 1024 /* max 65536 */
> +#define CTXLD_SB_LP_CTX_ENTRIES 10240 /* max 65536 */
> +#define CTXLD_SB_HP_CTX_ENTRIES 20000 /* max 65536 */
> +#define CTXLD_SB_CTX_ENTRIES (CTXLD_SB_LP_CTX_ENTRIES + \
> + CTXLD_SB_HP_CTX_ENTRIES)
> +
> +/* Sizes, in entries, of the DB, SB_HP and SB_LP context regions. */
> +static u16 dcss_ctxld_ctx_size[3] = {
> + CTXLD_DB_CTX_ENTRIES,
> + CTXLD_SB_HP_CTX_ENTRIES,
> + CTXLD_SB_LP_CTX_ENTRIES
> +};
> +
> +/* this represents an entry in the context loader map */
> +struct dcss_ctxld_item {
> + u32 val;
> + u32 ofs;
> +};
> +
> +#define CTX_ITEM_SIZE sizeof(struct dcss_ctxld_item)
> +
> +struct dcss_ctxld {
> + struct device *dev;
> + void __iomem *ctxld_reg;
> + int irq;
> + bool irq_en;
> +
> + struct dcss_ctxld_item *db[2];
> + struct dcss_ctxld_item *sb_hp[2];
> + struct dcss_ctxld_item *sb_lp[2];
> +
> + dma_addr_t db_paddr[2];
> + dma_addr_t sb_paddr[2];
> +
> + u16 ctx_size[2][3]; /* holds the sizes of DB, SB_HP and SB_LP ctx */
> + u8 current_ctx;
> +
> + bool in_use;
> + bool armed;
> +
> + spinlock_t lock; /* protects concurent access to private data */
> +};
> +
> +static irqreturn_t dcss_ctxld_irq_handler(int irq, void *data)
> +{
> + struct dcss_ctxld *ctxld = data;
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev);
> + u32 irq_status;
> +
> + irq_status = dcss_readl(ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
> +
> + if (irq_status & CTXLD_IRQ_COMPLETION &&
> + !(irq_status & CTXLD_ENABLE) && ctxld->in_use) {
> + ctxld->in_use = false;
> +
> + if (dcss && dcss->disable_callback)
> + dcss->disable_callback(dcss);
> + } else if (irq_status & CTXLD_IRQ_ERROR) {
> + /*
> + * Except for throwing an error message and clearing the status
> + * register, there's not much we can do here.
> + */
> + dev_err(ctxld->dev, "ctxld: error encountered: %08x\n",
> + irq_status);
> + dev_err(ctxld->dev, "ctxld: db=%d, sb_hp=%d, sb_lp=%d\n",
> + ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_DB],
> + ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_HP],
> + ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_LP]);
> + }
> +
> + dcss_clr(irq_status & (CTXLD_IRQ_ERROR | CTXLD_IRQ_COMPLETION),
> + ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int dcss_ctxld_irq_config(struct dcss_ctxld *ctxld,
> + struct platform_device *pdev)
> +{
> + int ret;
> +
> + ctxld->irq = platform_get_irq_byname(pdev, "ctxld");
> + if (ctxld->irq < 0)
> + return ctxld->irq;
> +
> + ret = request_irq(ctxld->irq, dcss_ctxld_irq_handler,
> + 0, "dcss_ctxld", ctxld);
> + if (ret) {
> + dev_err(ctxld->dev, "ctxld: irq request failed.\n");
> + return ret;
> + }
> +
> + ctxld->irq_en = true;
> +
> + return 0;
> +}
> +
> +static void dcss_ctxld_hw_cfg(struct dcss_ctxld *ctxld)
> +{
> + dcss_writel(RD_ERR_EN | SB_HP_COMP_EN |
> + DB_PEND_SB_REC_EN | AHB_ERR_EN | RD_ERR | AHB_ERR,
> + ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
> +}
> +
> +static void dcss_ctxld_free_ctx(struct dcss_ctxld *ctxld)
> +{
> + struct dcss_ctxld_item *ctx;
> + int i;
> +
> + for (i = 0; i < 2; i++) {
> + if (ctxld->db[i]) {
> + dma_free_coherent(ctxld->dev,
> + CTXLD_DB_CTX_ENTRIES * sizeof(*ctx),
> + ctxld->db[i], ctxld->db_paddr[i]);
> + ctxld->db[i] = NULL;
> + ctxld->db_paddr[i] = 0;
> + }
> +
> + if (ctxld->sb_hp[i]) {
> + dma_free_coherent(ctxld->dev,
> + CTXLD_SB_CTX_ENTRIES * sizeof(*ctx),
> + ctxld->sb_hp[i], ctxld->sb_paddr[i]);
> + ctxld->sb_hp[i] = NULL;
> + ctxld->sb_paddr[i] = 0;
> + }
> + }
> +}
> +
> +static int dcss_ctxld_alloc_ctx(struct dcss_ctxld *ctxld)
> +{
> + struct dcss_ctxld_item *ctx;
> + int i;
> +
> + for (i = 0; i < 2; i++) {
> + ctx = dma_alloc_coherent(ctxld->dev,
> + CTXLD_DB_CTX_ENTRIES * sizeof(*ctx),
> + &ctxld->db_paddr[i], GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + ctxld->db[i] = ctx;
> +
> + ctx = dma_alloc_coherent(ctxld->dev,
> + CTXLD_SB_CTX_ENTRIES * sizeof(*ctx),
> + &ctxld->sb_paddr[i], GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + ctxld->sb_hp[i] = ctx;
> + ctxld->sb_lp[i] = ctx + CTXLD_SB_HP_CTX_ENTRIES;
> + }
> +
> + return 0;
> +}
> +
> +int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base)
> +{
> + struct dcss_ctxld *ctxld;
> + int ret;
> +
> + ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL);
> + if (!ctxld)
> + return -ENOMEM;
> +
> + dcss->ctxld = ctxld;
> + ctxld->dev = dcss->dev;
> +
> + spin_lock_init(&ctxld->lock);
> +
> + ret = dcss_ctxld_alloc_ctx(ctxld);
> + if (ret) {
> + dev_err(dcss->dev, "ctxld: cannot allocate context memory.\n");
> + goto err;
> + }
> +
> + ctxld->ctxld_reg = ioremap(ctxld_base, SZ_4K);
> + if (!ctxld->ctxld_reg) {
> + dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n");
> + ret = -ENOMEM;
> + goto err;
> + }
> +
> + ret = dcss_ctxld_irq_config(ctxld, to_platform_device(dcss->dev));
> + if (ret)
> + goto err_irq;
> +
> + dcss_ctxld_hw_cfg(ctxld);
> +
> + return 0;
> +
> +err_irq:
> + iounmap(ctxld->ctxld_reg);
> +
> +err:
> + dcss_ctxld_free_ctx(ctxld);
> + kfree(ctxld);
> +
> + return ret;
> +}
> +
> +void dcss_ctxld_exit(struct dcss_ctxld *ctxld)
> +{
> + free_irq(ctxld->irq, ctxld);
> +
> + if (ctxld->ctxld_reg)
> + iounmap(ctxld->ctxld_reg);
> +
> + dcss_ctxld_free_ctx(ctxld);
> + kfree(ctxld);
> +}
> +
> +static int dcss_ctxld_enable_locked(struct dcss_ctxld *ctxld)
> +{
> + int curr_ctx = ctxld->current_ctx;
> + u32 db_base, sb_base, sb_count;
> + u32 sb_hp_cnt, sb_lp_cnt, db_cnt;
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev);
> +
> + if (!dcss)
> + return 0;
> +
> + dcss_dpr_write_sysctrl(dcss->dpr);
> +
> + dcss_scaler_write_sclctrl(dcss->scaler);
> +
> + sb_hp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_HP];
> + sb_lp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_LP];
> + db_cnt = ctxld->ctx_size[curr_ctx][CTX_DB];
> +
> + /* make sure SB_LP context area comes after SB_HP */
> + if (sb_lp_cnt &&
> + ctxld->sb_lp[curr_ctx] != ctxld->sb_hp[curr_ctx] + sb_hp_cnt) {
> + struct dcss_ctxld_item *sb_lp_adjusted;
> +
> + sb_lp_adjusted = ctxld->sb_hp[curr_ctx] + sb_hp_cnt;
> +
> + memcpy(sb_lp_adjusted, ctxld->sb_lp[curr_ctx],
> + sb_lp_cnt * CTX_ITEM_SIZE);
> + }
> +
> + db_base = db_cnt ? ctxld->db_paddr[curr_ctx] : 0;
> +
> + dcss_writel(db_base, ctxld->ctxld_reg + DCSS_CTXLD_DB_BASE_ADDR);
> + dcss_writel(db_cnt, ctxld->ctxld_reg + DCSS_CTXLD_DB_COUNT);
> +
> + if (sb_hp_cnt)
> + sb_count = ((sb_hp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK) |
> + ((sb_lp_cnt << SB_LP_COUNT_POS) & SB_LP_COUNT_MASK);
> + else
> + sb_count = (sb_lp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK;
> +
> + sb_base = sb_count ? ctxld->sb_paddr[curr_ctx] : 0;
> +
> + dcss_writel(sb_base, ctxld->ctxld_reg + DCSS_CTXLD_SB_BASE_ADDR);
> + dcss_writel(sb_count, ctxld->ctxld_reg + DCSS_CTXLD_SB_COUNT);
> +
> + /* enable the context loader */
> + dcss_set(CTXLD_ENABLE, ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS);
> +
> + ctxld->in_use = true;
> +
> + /*
> + * Toggle the current context to the alternate one so that any updates
> + * in the modules' settings take place there.
> + */
> + ctxld->current_ctx ^= 1;
> +
> + ctxld->ctx_size[ctxld->current_ctx][CTX_DB] = 0;
> + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] = 0;
> + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] = 0;
> +
> + return 0;
> +}
> +
> +int dcss_ctxld_enable(struct dcss_ctxld *ctxld)
> +{
> + spin_lock_irq(&ctxld->lock);
> + ctxld->armed = true;
> + spin_unlock_irq(&ctxld->lock);
> +
> + return 0;
> +}
> +
> +void dcss_ctxld_kick(struct dcss_ctxld *ctxld)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&ctxld->lock, flags);
> + if (ctxld->armed && !ctxld->in_use) {
> + ctxld->armed = false;
> + dcss_ctxld_enable_locked(ctxld);
> + }
> + spin_unlock_irqrestore(&ctxld->lock, flags);
> +}
> +
> +void dcss_ctxld_write_irqsafe(struct dcss_ctxld *ctxld, u32 ctx_id, u32 val,
> + u32 reg_ofs)
> +{
> + int curr_ctx = ctxld->current_ctx;
> + struct dcss_ctxld_item *ctx[] = {
> + [CTX_DB] = ctxld->db[curr_ctx],
> + [CTX_SB_HP] = ctxld->sb_hp[curr_ctx],
> + [CTX_SB_LP] = ctxld->sb_lp[curr_ctx]
> + };
> + int item_idx = ctxld->ctx_size[curr_ctx][ctx_id];
> +
> + if (item_idx + 1 > dcss_ctxld_ctx_size[ctx_id]) {
> + WARN_ON(1);
> + return;
> + }
> +
> + ctx[ctx_id][item_idx].val = val;
> + ctx[ctx_id][item_idx].ofs = reg_ofs;
> + ctxld->ctx_size[curr_ctx][ctx_id] += 1;
> +}
> +
> +void dcss_ctxld_write(struct dcss_ctxld *ctxld, u32 ctx_id,
> + u32 val, u32 reg_ofs)
> +{
> + spin_lock_irq(&ctxld->lock);
> + dcss_ctxld_write_irqsafe(ctxld, ctx_id, val, reg_ofs);
> + spin_unlock_irq(&ctxld->lock);
> +}
> +
> +bool dcss_ctxld_is_flushed(struct dcss_ctxld *ctxld)
> +{
> + return ctxld->ctx_size[ctxld->current_ctx][CTX_DB] == 0 &&
> + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] == 0 &&
> + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] == 0;
> +}
> +
> +int dcss_ctxld_resume(struct dcss_ctxld *ctxld)
> +{
> + dcss_ctxld_hw_cfg(ctxld);
> +
> + if (!ctxld->irq_en) {
> + enable_irq(ctxld->irq);
> + ctxld->irq_en = true;
> + }
> +
> + return 0;
> +}
> +
> +int dcss_ctxld_suspend(struct dcss_ctxld *ctxld)
> +{
> + int ret = 0;
> + unsigned long timeout = jiffies + msecs_to_jiffies(500);
> +
> + if (!dcss_ctxld_is_flushed(ctxld)) {
> + dcss_ctxld_kick(ctxld);
> +
> + while (!time_after(jiffies, timeout) && ctxld->in_use)
> + msleep(20);
> +
> + if (time_after(jiffies, timeout))
> + return -ETIMEDOUT;
> + }
> +
> + spin_lock_irq(&ctxld->lock);
> +
> + if (ctxld->irq_en) {
> + disable_irq_nosync(ctxld->irq);
> + ctxld->irq_en = false;
> + }
> +
> + /* reset context region and sizes */
> + ctxld->current_ctx = 0;
> + ctxld->ctx_size[0][CTX_DB] = 0;
> + ctxld->ctx_size[0][CTX_SB_HP] = 0;
> + ctxld->ctx_size[0][CTX_SB_LP] = 0;
> +
> + spin_unlock_irq(&ctxld->lock);
> +
> + return ret;
> +}
> +
> +void dcss_ctxld_assert_locked(struct dcss_ctxld *ctxld)
> +{
> + lockdep_assert_held(&ctxld->lock);
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c b/drivers/gpu/drm/imx/dcss/dcss-dev.c
> new file mode 100644
> index 000000000000..83a4840435cf
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dev.c
> @@ -0,0 +1,314 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/slab.h>
> +#include <drm/drm_modeset_helper.h>
> +
> +#include "dcss-dev.h"
> +
> +static void dcss_clocks_enable(struct dcss_dev *dcss)
> +{
> + clk_prepare_enable(dcss->axi_clk);
> + clk_prepare_enable(dcss->apb_clk);
> + clk_prepare_enable(dcss->rtrm_clk);
> + clk_prepare_enable(dcss->dtrc_clk);
> + clk_prepare_enable(dcss->pix_clk);
> +}
> +
> +static void dcss_clocks_disable(struct dcss_dev *dcss)
> +{
> + clk_disable_unprepare(dcss->pix_clk);
> + clk_disable_unprepare(dcss->dtrc_clk);
> + clk_disable_unprepare(dcss->rtrm_clk);
> + clk_disable_unprepare(dcss->apb_clk);
> + clk_disable_unprepare(dcss->axi_clk);
> +}
> +
> +static void dcss_disable_dtg_and_ss_cb(void *data)
> +{
> + struct dcss_dev *dcss = data;
> +
> + dcss->disable_callback = NULL;
> +
> + dcss_ss_shutoff(dcss->ss);
> + dcss_dtg_shutoff(dcss->dtg);
> +
> + complete(&dcss->disable_completion);
> +}
> +
> +void dcss_disable_dtg_and_ss(struct dcss_dev *dcss)
> +{
> + dcss->disable_callback = dcss_disable_dtg_and_ss_cb;
> +}
> +
> +void dcss_enable_dtg_and_ss(struct dcss_dev *dcss)
> +{
> + if (dcss->disable_callback)
> + dcss->disable_callback = NULL;
> +
> + dcss_dtg_enable(dcss->dtg);
> + dcss_ss_enable(dcss->ss);
> +}
> +
> +static int dcss_submodules_init(struct dcss_dev *dcss)
> +{
> + int ret = 0;
> + u32 base_addr = dcss->start_addr;
> + const struct dcss_type_data *devtype = dcss->devtype;
> +
> + dcss_clocks_enable(dcss);
> +
> + ret = dcss_blkctl_init(dcss, base_addr + devtype->blkctl_ofs);
> + if (ret)
> + return ret;
> +
> + ret = dcss_ctxld_init(dcss, base_addr + devtype->ctxld_ofs);
> + if (ret)
> + goto ctxld_err;
> +
> + ret = dcss_dtg_init(dcss, base_addr + devtype->dtg_ofs);
> + if (ret)
> + goto dtg_err;
> +
> + ret = dcss_ss_init(dcss, base_addr + devtype->ss_ofs);
> + if (ret)
> + goto ss_err;
> +
> + ret = dcss_dpr_init(dcss, base_addr + devtype->dpr_ofs);
> + if (ret)
> + goto dpr_err;
> +
> + ret = dcss_scaler_init(dcss, base_addr + devtype->scaler_ofs);
> + if (ret)
> + goto scaler_err;
> +
> + dcss_clocks_disable(dcss);
> +
> + return 0;
> +
> +scaler_err:
> + dcss_dpr_exit(dcss->dpr);
> +
> +dpr_err:
> + dcss_ss_exit(dcss->ss);
> +
> +ss_err:
> + dcss_dtg_exit(dcss->dtg);
> +
> +dtg_err:
> + dcss_ctxld_exit(dcss->ctxld);
> +
> +ctxld_err:
> + dcss_blkctl_exit(dcss->blkctl);
> +
> + dcss_clocks_disable(dcss);
> +
> + return ret;
> +}
> +
> +static void dcss_submodules_stop(struct dcss_dev *dcss)
> +{
> + dcss_clocks_enable(dcss);
> + dcss_scaler_exit(dcss->scaler);
> + dcss_dpr_exit(dcss->dpr);
> + dcss_ss_exit(dcss->ss);
> + dcss_dtg_exit(dcss->dtg);
> + dcss_ctxld_exit(dcss->ctxld);
> + dcss_blkctl_exit(dcss->blkctl);
> + dcss_clocks_disable(dcss);
> +}
> +
> +static int dcss_clks_init(struct dcss_dev *dcss)
> +{
> + int i;
> + struct {
> + const char *id;
> + struct clk **clk;
> + } clks[] = {
> + {"apb", &dcss->apb_clk},
> + {"axi", &dcss->axi_clk},
> + {"pix", &dcss->pix_clk},
> + {"rtrm", &dcss->rtrm_clk},
> + {"dtrc", &dcss->dtrc_clk},
> + };
> +
> + for (i = 0; i < ARRAY_SIZE(clks); i++) {
> + *clks[i].clk = devm_clk_get(dcss->dev, clks[i].id);
> + if (IS_ERR(*clks[i].clk)) {
> + dev_err(dcss->dev, "failed to get %s clock\n",
> + clks[i].id);
> + return PTR_ERR(*clks[i].clk);
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void dcss_clks_release(struct dcss_dev *dcss)
> +{
> + devm_clk_put(dcss->dev, dcss->dtrc_clk);
> + devm_clk_put(dcss->dev, dcss->rtrm_clk);
> + devm_clk_put(dcss->dev, dcss->pix_clk);
> + devm_clk_put(dcss->dev, dcss->axi_clk);
> + devm_clk_put(dcss->dev, dcss->apb_clk);
> +}
> +
> +struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + int ret;
> + struct resource *res;
> + struct dcss_dev *dcss;
> + const struct dcss_type_data *devtype;
> +
> + devtype = of_device_get_match_data(dev);
> + if (!devtype) {
> + dev_err(dev, "no device match found\n");
> + return ERR_PTR(-ENODEV);
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(dev, "cannot get memory resource\n");
> + return ERR_PTR(-EINVAL);
> + }
> +
> + dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
> + if (!dcss)
> + return ERR_PTR(-ENOMEM);
> +
> + dcss->dev = dev;
> + dcss->devtype = devtype;
> + dcss->hdmi_output = hdmi_output;
> +
> + ret = dcss_clks_init(dcss);
> + if (ret) {
> + dev_err(dev, "clocks initialization failed\n");
> + goto err;
> + }
> +
> + dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
> + if (!dcss->of_port) {
> + dev_err(dev, "no port@0 node in %s\n", dev->of_node->full_name);
> + ret = -ENODEV;
> + goto clks_err;
> + }
> +
> + dcss->start_addr = res->start;
> +
> + ret = dcss_submodules_init(dcss);
> + if (ret) {
> + dev_err(dev, "submodules initialization failed\n");
> + goto clks_err;
> + }
> +
> + init_completion(&dcss->disable_completion);
> +
> + pm_runtime_set_autosuspend_delay(dev, 100);
> + pm_runtime_use_autosuspend(dev);
> + pm_runtime_set_suspended(dev);
> + pm_runtime_allow(dev);
> + pm_runtime_enable(dev);
> +
> + return dcss;
> +
> +clks_err:
> + dcss_clks_release(dcss);
> +
> +err:
> + kfree(dcss);
> +
> + return ERR_PTR(ret);
> +}
> +
> +void dcss_dev_destroy(struct dcss_dev *dcss)
> +{
> + if (!pm_runtime_suspended(dcss->dev)) {
> + dcss_ctxld_suspend(dcss->ctxld);
> + dcss_clocks_disable(dcss);
> + }
> +
> + pm_runtime_disable(dcss->dev);
> +
> + dcss_submodules_stop(dcss);
> +
> + dcss_clks_release(dcss);
> +
> + kfree(dcss);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +int dcss_dev_suspend(struct device *dev)
> +{
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
> + int ret;
> +
> + drm_mode_config_helper_suspend(dcss_drv_dev_to_drm(dev));
> +
> + if (pm_runtime_suspended(dev))
> + return 0;
> +
> + ret = dcss_ctxld_suspend(dcss->ctxld);
> + if (ret)
> + return ret;
> +
> + dcss_clocks_disable(dcss);
> +
> + return 0;
> +}
> +
> +int dcss_dev_resume(struct device *dev)
> +{
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
> +
> + if (pm_runtime_suspended(dev)) {
> + drm_mode_config_helper_resume(dcss_drv_dev_to_drm(dev));
> + return 0;
> + }
> +
> + dcss_clocks_enable(dcss);
> +
> + dcss_blkctl_cfg(dcss->blkctl);
> +
> + dcss_ctxld_resume(dcss->ctxld);
> +
> + drm_mode_config_helper_resume(dcss_drv_dev_to_drm(dev));
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM_SLEEP */
> +
> +#ifdef CONFIG_PM
> +int dcss_dev_runtime_suspend(struct device *dev)
> +{
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
> + int ret;
> +
> + ret = dcss_ctxld_suspend(dcss->ctxld);
> + if (ret)
> + return ret;
> +
> + dcss_clocks_disable(dcss);
> +
> + return 0;
> +}
> +
> +int dcss_dev_runtime_resume(struct device *dev)
> +{
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
> +
> + dcss_clocks_enable(dcss);
> +
> + dcss_blkctl_cfg(dcss->blkctl);
> +
> + dcss_ctxld_resume(dcss->ctxld);
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM */
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.h b/drivers/gpu/drm/imx/dcss/dcss-dev.h
> new file mode 100644
> index 000000000000..c642ae17837f
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dev.h
> @@ -0,0 +1,177 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#ifndef __DCSS_PRV_H__
> +#define __DCSS_PRV_H__
> +
> +#include <drm/drm_fourcc.h>
> +#include <linux/io.h>
> +#include <video/videomode.h>
> +
> +#define SET 0x04
> +#define CLR 0x08
> +#define TGL 0x0C
> +
> +#define dcss_writel(v, c) writel((v), (c))
> +#define dcss_readl(c) readl(c)
> +#define dcss_set(v, c) writel((v), (c) + SET)
> +#define dcss_clr(v, c) writel((v), (c) + CLR)
> +#define dcss_toggle(v, c) writel((v), (c) + TGL)
> +
> +static inline void dcss_update(u32 v, u32 m, void __iomem *c)
> +{
> + writel((readl(c) & ~(m)) | (v), (c));
> +}
> +
> +#define DCSS_DBG_REG(reg) {.name = #reg, .ofs = reg}
> +
> +enum {
> + DCSS_IMX8MQ = 0,
> +};
> +
> +struct dcss_type_data {
> + const char *name;
> + u32 blkctl_ofs;
> + u32 ctxld_ofs;
> + u32 rdsrc_ofs;
> + u32 wrscl_ofs;
> + u32 dtg_ofs;
> + u32 scaler_ofs;
> + u32 ss_ofs;
> + u32 dpr_ofs;
> + u32 dtrc_ofs;
> + u32 dec400d_ofs;
> + u32 hdr10_ofs;
> +};
> +
> +struct dcss_debug_reg {
> + char *name;
> + u32 ofs;
> +};
> +
> +enum dcss_ctxld_ctx_type {
> + CTX_DB,
> + CTX_SB_HP, /* high-priority */
> + CTX_SB_LP, /* low-priority */
> +};
> +
> +struct dcss_dev {
> + struct device *dev;
> + const struct dcss_type_data *devtype;
> + struct device_node *of_port;
> +
> + u32 start_addr;
> +
> + struct dcss_blkctl *blkctl;
> + struct dcss_ctxld *ctxld;
> + struct dcss_dpr *dpr;
> + struct dcss_dtg *dtg;
> + struct dcss_ss *ss;
> + struct dcss_hdr10 *hdr10;
> + struct dcss_scaler *scaler;
> + struct dcss_dtrc *dtrc;
> + struct dcss_dec400d *dec400d;
> + struct dcss_wrscl *wrscl;
> + struct dcss_rdsrc *rdsrc;
> +
> + struct clk *apb_clk;
> + struct clk *axi_clk;
> + struct clk *pix_clk;
> + struct clk *rtrm_clk;
> + struct clk *dtrc_clk;
> + struct clk *pll_src_clk;
> + struct clk *pll_phy_ref_clk;
> +
> + bool hdmi_output;
> +
> + void (*disable_callback)(void *data);
> + struct completion disable_completion;
> +};
> +
> +struct dcss_dev *dcss_drv_dev_to_dcss(struct device *dev);
> +struct drm_device *dcss_drv_dev_to_drm(struct device *dev);
> +struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output);
> +void dcss_dev_destroy(struct dcss_dev *dcss);
> +int dcss_dev_runtime_suspend(struct device *dev);
> +int dcss_dev_runtime_resume(struct device *dev);
> +int dcss_dev_suspend(struct device *dev);
> +int dcss_dev_resume(struct device *dev);
> +void dcss_enable_dtg_and_ss(struct dcss_dev *dcss);
> +void dcss_disable_dtg_and_ss(struct dcss_dev *dcss);
> +
> +/* BLKCTL */
> +int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base);
> +void dcss_blkctl_cfg(struct dcss_blkctl *blkctl);
> +void dcss_blkctl_exit(struct dcss_blkctl *blkctl);
> +
> +/* CTXLD */
> +int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base);
> +void dcss_ctxld_exit(struct dcss_ctxld *ctxld);
> +void dcss_ctxld_write(struct dcss_ctxld *ctxld, u32 ctx_id,
> + u32 val, u32 reg_idx);
> +int dcss_ctxld_resume(struct dcss_ctxld *dcss_ctxld);
> +int dcss_ctxld_suspend(struct dcss_ctxld *dcss_ctxld);
> +void dcss_ctxld_write_irqsafe(struct dcss_ctxld *ctlxd, u32 ctx_id, u32 val,
> + u32 reg_ofs);
> +void dcss_ctxld_kick(struct dcss_ctxld *ctxld);
> +bool dcss_ctxld_is_flushed(struct dcss_ctxld *ctxld);
> +int dcss_ctxld_enable(struct dcss_ctxld *ctxld);
> +void dcss_ctxld_register_completion(struct dcss_ctxld *ctxld,
> + struct completion *dis_completion);
> +void dcss_ctxld_assert_locked(struct dcss_ctxld *ctxld);
> +
> +/* DPR */
> +int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base);
> +void dcss_dpr_exit(struct dcss_dpr *dpr);
> +void dcss_dpr_write_sysctrl(struct dcss_dpr *dpr);
> +void dcss_dpr_set_res(struct dcss_dpr *dpr, int ch_num, u32 xres, u32 yres);
> +void dcss_dpr_addr_set(struct dcss_dpr *dpr, int ch_num, u32 luma_base_addr,
> + u32 chroma_base_addr, u16 pitch);
> +void dcss_dpr_enable(struct dcss_dpr *dpr, int ch_num, bool en);
> +void dcss_dpr_format_set(struct dcss_dpr *dpr, int ch_num,
> + const struct drm_format_info *format, u64 modifier);
> +void dcss_dpr_set_rotation(struct dcss_dpr *dpr, int ch_num, u32 rotation);
> +
> +/* DTG */
> +int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base);
> +void dcss_dtg_exit(struct dcss_dtg *dtg);
> +bool dcss_dtg_vblank_irq_valid(struct dcss_dtg *dtg);
> +void dcss_dtg_vblank_irq_enable(struct dcss_dtg *dtg, bool en);
> +void dcss_dtg_vblank_irq_clear(struct dcss_dtg *dtg);
> +void dcss_dtg_sync_set(struct dcss_dtg *dtg, struct videomode *vm);
> +void dcss_dtg_css_set(struct dcss_dtg *dtg);
> +void dcss_dtg_enable(struct dcss_dtg *dtg);
> +void dcss_dtg_shutoff(struct dcss_dtg *dtg);
> +bool dcss_dtg_is_enabled(struct dcss_dtg *dtg);
> +void dcss_dtg_ctxld_kick_irq_enable(struct dcss_dtg *dtg, bool en);
> +bool dcss_dtg_global_alpha_changed(struct dcss_dtg *dtg, int ch_num, int alpha);
> +void dcss_dtg_plane_alpha_set(struct dcss_dtg *dtg, int ch_num,
> + const struct drm_format_info *format, int alpha);
> +void dcss_dtg_plane_pos_set(struct dcss_dtg *dtg, int ch_num,
> + int px, int py, int pw, int ph);
> +void dcss_dtg_ch_enable(struct dcss_dtg *dtg, int ch_num, bool en);
> +
> +/* SUBSAM */
> +int dcss_ss_init(struct dcss_dev *dcss, unsigned long subsam_base);
> +void dcss_ss_exit(struct dcss_ss *ss);
> +void dcss_ss_enable(struct dcss_ss *ss);
> +void dcss_ss_shutoff(struct dcss_ss *ss);
> +void dcss_ss_subsam_set(struct dcss_ss *ss);
> +void dcss_ss_sync_set(struct dcss_ss *ss, struct videomode *vm,
> + bool phsync, bool pvsync);
> +
> +/* SCALER */
> +int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base);
> +void dcss_scaler_exit(struct dcss_scaler *scl);
> +void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
> + const struct drm_format_info *format,
> + int src_xres, int src_yres, int dst_xres, int dst_yres,
> + u32 vrefresh_hz);
> +void dcss_scaler_ch_enable(struct dcss_scaler *scl, int ch_num, bool en);
> +int dcss_scaler_get_min_max_ratios(struct dcss_scaler *scl, int ch_num,
> + int *min, int *max);
> +void dcss_scaler_write_sclctrl(struct dcss_scaler *scl);
> +
> +#endif /* __DCSS_PRV_H__ */
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dpr.c b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
> new file mode 100644
> index 000000000000..df9dab949bf2
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dpr.c
> @@ -0,0 +1,562 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/slab.h>
> +
> +#include "dcss-dev.h"
> +
> +#define DCSS_DPR_SYSTEM_CTRL0 0x000
> +#define RUN_EN BIT(0)
> +#define SOFT_RESET BIT(1)
> +#define REPEAT_EN BIT(2)
> +#define SHADOW_LOAD_EN BIT(3)
> +#define SW_SHADOW_LOAD_SEL BIT(4)
> +#define BCMD2AXI_MSTR_ID_CTRL BIT(16)
> +#define DCSS_DPR_IRQ_MASK 0x020
> +#define DCSS_DPR_IRQ_MASK_STATUS 0x030
> +#define DCSS_DPR_IRQ_NONMASK_STATUS 0x040
> +#define IRQ_DPR_CTRL_DONE BIT(0)
> +#define IRQ_DPR_RUN BIT(1)
> +#define IRQ_DPR_SHADOW_LOADED BIT(2)
> +#define IRQ_AXI_READ_ERR BIT(3)
> +#define DPR2RTR_YRGB_FIFO_OVFL BIT(4)
> +#define DPR2RTR_UV_FIFO_OVFL BIT(5)
> +#define DPR2RTR_FIFO_LD_BUF_RDY_YRGB_ERR BIT(6)
> +#define DPR2RTR_FIFO_LD_BUF_RDY_UV_ERR BIT(7)
> +#define DCSS_DPR_MODE_CTRL0 0x050
> +#define RTR_3BUF_EN BIT(0)
> +#define RTR_4LINE_BUF_EN BIT(1)
> +#define TILE_TYPE_POS 2
> +#define TILE_TYPE_MASK GENMASK(4, 2)
> +#define YUV_EN BIT(6)
> +#define COMP_2PLANE_EN BIT(7)
> +#define PIX_SIZE_POS 8
> +#define PIX_SIZE_MASK GENMASK(9, 8)
> +#define PIX_LUMA_UV_SWAP BIT(10)
> +#define PIX_UV_SWAP BIT(11)
> +#define B_COMP_SEL_POS 12
> +#define B_COMP_SEL_MASK GENMASK(13, 12)
> +#define G_COMP_SEL_POS 14
> +#define G_COMP_SEL_MASK GENMASK(15, 14)
> +#define R_COMP_SEL_POS 16
> +#define R_COMP_SEL_MASK GENMASK(17, 16)
> +#define A_COMP_SEL_POS 18
> +#define A_COMP_SEL_MASK GENMASK(19, 18)
> +#define DCSS_DPR_FRAME_CTRL0 0x070
> +#define HFLIP_EN BIT(0)
> +#define VFLIP_EN BIT(1)
> +#define ROT_ENC_POS 2
> +#define ROT_ENC_MASK GENMASK(3, 2)
> +#define ROT_FLIP_ORDER_EN BIT(4)
> +#define PITCH_POS 16
> +#define PITCH_MASK GENMASK(31, 16)
> +#define DCSS_DPR_FRAME_1P_CTRL0 0x090
> +#define DCSS_DPR_FRAME_1P_PIX_X_CTRL 0x0A0
> +#define DCSS_DPR_FRAME_1P_PIX_Y_CTRL 0x0B0
> +#define DCSS_DPR_FRAME_1P_BASE_ADDR 0x0C0
> +#define DCSS_DPR_FRAME_2P_CTRL0 0x0E0
> +#define DCSS_DPR_FRAME_2P_PIX_X_CTRL 0x0F0
> +#define DCSS_DPR_FRAME_2P_PIX_Y_CTRL 0x100
> +#define DCSS_DPR_FRAME_2P_BASE_ADDR 0x110
> +#define DCSS_DPR_STATUS_CTRL0 0x130
> +#define STATUS_MUX_SEL_MASK GENMASK(2, 0)
> +#define STATUS_SRC_SEL_POS 16
> +#define STATUS_SRC_SEL_MASK GENMASK(18, 16)
> +#define DCSS_DPR_STATUS_CTRL1 0x140
> +#define DCSS_DPR_RTRAM_CTRL0 0x200
> +#define NUM_ROWS_ACTIVE BIT(0)
> +#define THRES_HIGH_POS 1
> +#define THRES_HIGH_MASK GENMASK(3, 1)
> +#define THRES_LOW_POS 4
> +#define THRES_LOW_MASK GENMASK(6, 4)
> +#define ABORT_SEL BIT(7)
> +
> +enum dcss_tile_type {
> + TILE_LINEAR = 0,
> + TILE_GPU_STANDARD,
> + TILE_GPU_SUPER,
> + TILE_VPU_YUV420,
> + TILE_VPU_VP9,
> +};
> +
> +enum dcss_pix_size {
> + PIX_SIZE_8,
> + PIX_SIZE_16,
> + PIX_SIZE_32,
> +};
> +
> +struct dcss_dpr_ch {
> + struct dcss_dpr *dpr;
> + void __iomem *base_reg;
> + u32 base_ofs;
> +
> + struct drm_format_info format;
> + enum dcss_pix_size pix_size;
> + enum dcss_tile_type tile;
> + bool rtram_4line_en;
> + bool rtram_3buf_en;
> +
> + u32 frame_ctrl;
> + u32 mode_ctrl;
> + u32 sys_ctrl;
> + u32 rtram_ctrl;
> +
> + bool sys_ctrl_chgd;
> +
> + int ch_num;
> + int irq;
> +};
> +
> +struct dcss_dpr {
> + struct device *dev;
> + struct dcss_ctxld *ctxld;
> + u32 ctx_id;
> +
> + struct dcss_dpr_ch ch[3];
> +};
> +
> +static void dcss_dpr_write(struct dcss_dpr_ch *ch, u32 val, u32 ofs)
> +{
> + struct dcss_dpr *dpr = ch->dpr;
> +
> + dcss_ctxld_write(dpr->ctxld, dpr->ctx_id, val, ch->base_ofs + ofs);
> +}
> +
> +static int dcss_dpr_ch_init_all(struct dcss_dpr *dpr, unsigned long dpr_base)
> +{
> + struct dcss_dpr_ch *ch;
> + int i;
> +
> + for (i = 0; i < 3; i++) {
> + ch = &dpr->ch[i];
> +
> + ch->base_ofs = dpr_base + i * 0x1000;
> +
> + ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
> + if (!ch->base_reg) {
> + dev_err(dpr->dev, "dpr: unable to remap ch %d base\n",
> + i);
> + return -ENOMEM;
> + }
> +
> + ch->dpr = dpr;
> + ch->ch_num = i;
> +
> + dcss_writel(0xff, ch->base_reg + DCSS_DPR_IRQ_MASK);
> + }
> +
> + return 0;
> +}
> +
> +int dcss_dpr_init(struct dcss_dev *dcss, unsigned long dpr_base)
> +{
> + struct dcss_dpr *dpr;
> +
> + dpr = kzalloc(sizeof(*dpr), GFP_KERNEL);
> + if (!dpr)
> + return -ENOMEM;
> +
> + dcss->dpr = dpr;
> + dpr->dev = dcss->dev;
> + dpr->ctxld = dcss->ctxld;
> + dpr->ctx_id = CTX_SB_HP;
> +
> + if (dcss_dpr_ch_init_all(dpr, dpr_base)) {
> + int i;
> +
> + for (i = 0; i < 3; i++) {
> + if (dpr->ch[i].base_reg)
> + iounmap(dpr->ch[i].base_reg);
> + }
> +
> + kfree(dpr);
> +
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +void dcss_dpr_exit(struct dcss_dpr *dpr)
> +{
> + int ch_no;
> +
> + /* stop DPR on all channels */
> + for (ch_no = 0; ch_no < 3; ch_no++) {
> + struct dcss_dpr_ch *ch = &dpr->ch[ch_no];
> +
> + dcss_writel(0, ch->base_reg + DCSS_DPR_SYSTEM_CTRL0);
> +
> + if (ch->base_reg)
> + iounmap(ch->base_reg);
> + }
> +
> + kfree(dpr);
> +}
> +
> +static u32 dcss_dpr_x_pix_wide_adjust(struct dcss_dpr_ch *ch, u32 pix_wide,
> + u32 pix_format)
> +{
> + u8 pix_in_64byte_map[3][5] = {
> + /* LIN, GPU_STD, GPU_SUP, VPU_YUV420, VPU_VP9 */
> + { 64, 8, 8, 8, 16}, /* PIX_SIZE_8 */
> + { 32, 8, 8, 8, 8}, /* PIX_SIZE_16 */
> + { 16, 4, 4, 8, 8}, /* PIX_SIZE_32 */
> + };
> + u32 offset;
> + u32 div_64byte_mod, pix_in_64byte;
> +
> + pix_in_64byte = pix_in_64byte_map[ch->pix_size][ch->tile];
> +
> + div_64byte_mod = pix_wide % pix_in_64byte;
> + offset = (div_64byte_mod == 0) ? 0 : (pix_in_64byte - div_64byte_mod);
> +
> + return pix_wide + offset;
> +}
> +
> +static u32 dcss_dpr_y_pix_high_adjust(struct dcss_dpr_ch *ch, u32 pix_high,
> + u32 pix_format)
> +{
> + u8 num_rows_buf = ch->rtram_4line_en ? 4 : 8;
> + u32 offset, pix_y_mod;
> +
> + pix_y_mod = pix_high % num_rows_buf;
> + offset = pix_y_mod ? (num_rows_buf - pix_y_mod) : 0;
> +
> + return pix_high + offset;
> +}
> +
> +void dcss_dpr_set_res(struct dcss_dpr *dpr, int ch_num, u32 xres, u32 yres)
> +{
> + struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
> + u32 pix_format = ch->format.format;
> + u32 gap = DCSS_DPR_FRAME_2P_BASE_ADDR - DCSS_DPR_FRAME_1P_BASE_ADDR;
> + int plane, max_planes = 1;
> + u32 pix_x_wide, pix_y_high;
> +
> + if (pix_format == DRM_FORMAT_NV12 ||
> + pix_format == DRM_FORMAT_NV21)
> + max_planes = 2;
> +
> + for (plane = 0; plane < max_planes; plane++) {
> + yres = plane == 1 ? yres >> 1 : yres;
> +
> + pix_x_wide = dcss_dpr_x_pix_wide_adjust(ch, xres, pix_format);
> + pix_y_high = dcss_dpr_y_pix_high_adjust(ch, yres, pix_format);
> +
> + dcss_dpr_write(ch, pix_x_wide,
> + DCSS_DPR_FRAME_1P_PIX_X_CTRL + plane * gap);
> + dcss_dpr_write(ch, pix_y_high,
> + DCSS_DPR_FRAME_1P_PIX_Y_CTRL + plane * gap);
> +
> + dcss_dpr_write(ch, 2, DCSS_DPR_FRAME_1P_CTRL0 + plane * gap);
> + }
> +}
> +
> +void dcss_dpr_addr_set(struct dcss_dpr *dpr, int ch_num, u32 luma_base_addr,
> + u32 chroma_base_addr, u16 pitch)
> +{
> + struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
> +
> + dcss_dpr_write(ch, luma_base_addr, DCSS_DPR_FRAME_1P_BASE_ADDR);
> +
> + dcss_dpr_write(ch, chroma_base_addr, DCSS_DPR_FRAME_2P_BASE_ADDR);
> +
> + ch->frame_ctrl &= ~PITCH_MASK;
> + ch->frame_ctrl |= (((u32)pitch << PITCH_POS) & PITCH_MASK);
> +}
> +
> +static void dcss_dpr_argb_comp_sel(struct dcss_dpr_ch *ch, int a_sel, int r_sel,
> + int g_sel, int b_sel)
> +{
> + u32 sel;
> +
> + sel = ((a_sel << A_COMP_SEL_POS) & A_COMP_SEL_MASK) |
> + ((r_sel << R_COMP_SEL_POS) & R_COMP_SEL_MASK) |
> + ((g_sel << G_COMP_SEL_POS) & G_COMP_SEL_MASK) |
> + ((b_sel << B_COMP_SEL_POS) & B_COMP_SEL_MASK);
> +
> + ch->mode_ctrl &= ~(A_COMP_SEL_MASK | R_COMP_SEL_MASK |
> + G_COMP_SEL_MASK | B_COMP_SEL_MASK);
> + ch->mode_ctrl |= sel;
> +}
> +
> +static void dcss_dpr_pix_size_set(struct dcss_dpr_ch *ch,
> + const struct drm_format_info *format)
> +{
> + u32 val;
> +
> + switch (format->format) {
> + case DRM_FORMAT_NV12:
> + case DRM_FORMAT_NV21:
> + val = PIX_SIZE_8;
> + break;
> +
> + case DRM_FORMAT_UYVY:
> + case DRM_FORMAT_VYUY:
> + case DRM_FORMAT_YUYV:
> + case DRM_FORMAT_YVYU:
> + val = PIX_SIZE_16;
> + break;
> +
> + default:
> + val = PIX_SIZE_32;
> + break;
> + }
> +
> + ch->pix_size = val;
> +
> + ch->mode_ctrl &= ~PIX_SIZE_MASK;
> + ch->mode_ctrl |= ((val << PIX_SIZE_POS) & PIX_SIZE_MASK);
> +}
> +
> +static void dcss_dpr_uv_swap(struct dcss_dpr_ch *ch, bool swap)
> +{
> + ch->mode_ctrl &= ~PIX_UV_SWAP;
> + ch->mode_ctrl |= (swap ? PIX_UV_SWAP : 0);
> +}
> +
> +static void dcss_dpr_y_uv_swap(struct dcss_dpr_ch *ch, bool swap)
> +{
> + ch->mode_ctrl &= ~PIX_LUMA_UV_SWAP;
> + ch->mode_ctrl |= (swap ? PIX_LUMA_UV_SWAP : 0);
> +}
> +
> +static void dcss_dpr_2plane_en(struct dcss_dpr_ch *ch, bool en)
> +{
> + ch->mode_ctrl &= ~COMP_2PLANE_EN;
> + ch->mode_ctrl |= (en ? COMP_2PLANE_EN : 0);
> +}
> +
> +static void dcss_dpr_yuv_en(struct dcss_dpr_ch *ch, bool en)
> +{
> + ch->mode_ctrl &= ~YUV_EN;
> + ch->mode_ctrl |= (en ? YUV_EN : 0);
> +}
> +
> +void dcss_dpr_enable(struct dcss_dpr *dpr, int ch_num, bool en)
> +{
> + struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
> + u32 sys_ctrl;
> +
> + sys_ctrl = (en ? REPEAT_EN | RUN_EN : 0);
> +
> + if (en) {
> + dcss_dpr_write(ch, ch->mode_ctrl, DCSS_DPR_MODE_CTRL0);
> + dcss_dpr_write(ch, ch->frame_ctrl, DCSS_DPR_FRAME_CTRL0);
> + dcss_dpr_write(ch, ch->rtram_ctrl, DCSS_DPR_RTRAM_CTRL0);
> + }
> +
> + if (ch->sys_ctrl != sys_ctrl)
> + ch->sys_ctrl_chgd = true;
> +
> + ch->sys_ctrl = sys_ctrl;
> +}
> +
> +struct rgb_comp_sel {
> + u32 drm_format;
> + int a_sel;
> + int r_sel;
> + int g_sel;
> + int b_sel;
> +};
> +
> +static struct rgb_comp_sel comp_sel_map[] = {
> + {DRM_FORMAT_ARGB8888, 3, 2, 1, 0},
> + {DRM_FORMAT_XRGB8888, 3, 2, 1, 0},
> + {DRM_FORMAT_ABGR8888, 3, 0, 1, 2},
> + {DRM_FORMAT_XBGR8888, 3, 0, 1, 2},
> + {DRM_FORMAT_RGBA8888, 0, 3, 2, 1},
> + {DRM_FORMAT_RGBX8888, 0, 3, 2, 1},
> + {DRM_FORMAT_BGRA8888, 0, 1, 2, 3},
> + {DRM_FORMAT_BGRX8888, 0, 1, 2, 3},
> +};
> +
> +static int to_comp_sel(u32 pix_fmt, int *a_sel, int *r_sel, int *g_sel,
> + int *b_sel)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(comp_sel_map); i++) {
> + if (comp_sel_map[i].drm_format == pix_fmt) {
> + *a_sel = comp_sel_map[i].a_sel;
> + *r_sel = comp_sel_map[i].r_sel;
> + *g_sel = comp_sel_map[i].g_sel;
> + *b_sel = comp_sel_map[i].b_sel;
> +
> + return 0;
> + }
> + }
> +
> + return -1;
> +}
> +
> +static void dcss_dpr_rtram_set(struct dcss_dpr_ch *ch, u32 pix_format)
> +{
> + u32 val, mask;
> +
> + switch (pix_format) {
> + case DRM_FORMAT_NV21:
> + case DRM_FORMAT_NV12:
> + ch->rtram_3buf_en = true;
> + ch->rtram_4line_en = false;
> + break;
> +
> + default:
> + ch->rtram_3buf_en = true;
> + ch->rtram_4line_en = true;
> + break;
> + }
> +
> + val = (ch->rtram_4line_en ? RTR_4LINE_BUF_EN : 0);
> + val |= (ch->rtram_3buf_en ? RTR_3BUF_EN : 0);
> + mask = RTR_4LINE_BUF_EN | RTR_3BUF_EN;
> +
> + ch->mode_ctrl &= ~mask;
> + ch->mode_ctrl |= (val & mask);
> +
> + val = (ch->rtram_4line_en ? 0 : NUM_ROWS_ACTIVE);
> + val |= (3 << THRES_LOW_POS) & THRES_LOW_MASK;
> + val |= (4 << THRES_HIGH_POS) & THRES_HIGH_MASK;
> + mask = THRES_LOW_MASK | THRES_HIGH_MASK | NUM_ROWS_ACTIVE;
> +
> + ch->rtram_ctrl &= ~mask;
> + ch->rtram_ctrl |= (val & mask);
> +}
> +
> +static void dcss_dpr_setup_components(struct dcss_dpr_ch *ch,
> + const struct drm_format_info *format)
> +{
> + int a_sel, r_sel, g_sel, b_sel;
> + bool uv_swap, y_uv_swap;
> +
> + switch (format->format) {
> + case DRM_FORMAT_YVYU:
> + uv_swap = true;
> + y_uv_swap = true;
> + break;
> +
> + case DRM_FORMAT_VYUY:
> + case DRM_FORMAT_NV21:
> + uv_swap = true;
> + y_uv_swap = false;
> + break;
> +
> + case DRM_FORMAT_YUYV:
> + uv_swap = false;
> + y_uv_swap = true;
> + break;
> +
> + default:
> + uv_swap = false;
> + y_uv_swap = false;
> + break;
> + }
> +
> + dcss_dpr_uv_swap(ch, uv_swap);
> +
> + dcss_dpr_y_uv_swap(ch, y_uv_swap);
> +
> + if (!format->is_yuv) {
> + if (!to_comp_sel(format->format, &a_sel, &r_sel,
> + &g_sel, &b_sel)) {
> + dcss_dpr_argb_comp_sel(ch, a_sel, r_sel, g_sel, b_sel);
> + } else {
> + dcss_dpr_argb_comp_sel(ch, 3, 2, 1, 0);
> + }
> + } else {
> + dcss_dpr_argb_comp_sel(ch, 0, 0, 0, 0);
> + }
> +}
> +
> +static void dcss_dpr_tile_set(struct dcss_dpr_ch *ch, uint64_t modifier)
> +{
> + switch (ch->ch_num) {
> + case 0:
> + switch (modifier) {
> + case DRM_FORMAT_MOD_LINEAR:
> + ch->tile = TILE_LINEAR;
> + break;
> + case DRM_FORMAT_MOD_VIVANTE_TILED:
> + ch->tile = TILE_GPU_STANDARD;
> + break;
> + case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
> + ch->tile = TILE_GPU_SUPER;
> + break;
> + default:
> + WARN_ON(1);
> + break;
> + }
> + break;
> + case 1:
> + case 2:
> + ch->tile = TILE_LINEAR;
> + break;
> + default:
> + WARN_ON(1);
> + return;
> + }
> +
> + ch->mode_ctrl &= ~TILE_TYPE_MASK;
> + ch->mode_ctrl |= ((ch->tile << TILE_TYPE_POS) & TILE_TYPE_MASK);
> +}
> +
> +void dcss_dpr_format_set(struct dcss_dpr *dpr, int ch_num,
> + const struct drm_format_info *format, u64 modifier)
> +{
> + struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
> +
> + ch->format = *format;
> +
> + dcss_dpr_yuv_en(ch, format->is_yuv);
> +
> + dcss_dpr_pix_size_set(ch, format);
> +
> + dcss_dpr_setup_components(ch, format);
> +
> + dcss_dpr_2plane_en(ch, format->num_planes == 2);
> +
> + dcss_dpr_rtram_set(ch, format->format);
> +
> + dcss_dpr_tile_set(ch, modifier);
> +}
> +
> +/* This function will be called from interrupt context. */
> +void dcss_dpr_write_sysctrl(struct dcss_dpr *dpr)
> +{
> + int chnum;
> +
> + dcss_ctxld_assert_locked(dpr->ctxld);
> +
> + for (chnum = 0; chnum < 3; chnum++) {
> + struct dcss_dpr_ch *ch = &dpr->ch[chnum];
> +
> + if (ch->sys_ctrl_chgd) {
> + dcss_ctxld_write_irqsafe(dpr->ctxld, dpr->ctx_id,
> + ch->sys_ctrl,
> + ch->base_ofs +
> + DCSS_DPR_SYSTEM_CTRL0);
> + ch->sys_ctrl_chgd = false;
> + }
> + }
> +}
> +
> +void dcss_dpr_set_rotation(struct dcss_dpr *dpr, int ch_num, u32 rotation)
> +{
> + struct dcss_dpr_ch *ch = &dpr->ch[ch_num];
> +
> + ch->frame_ctrl &= ~(HFLIP_EN | VFLIP_EN | ROT_ENC_MASK);
> +
> + ch->frame_ctrl |= rotation & DRM_MODE_REFLECT_X ? HFLIP_EN : 0;
> + ch->frame_ctrl |= rotation & DRM_MODE_REFLECT_Y ? VFLIP_EN : 0;
> +
> + if (rotation & DRM_MODE_ROTATE_90)
> + ch->frame_ctrl |= 1 << ROT_ENC_POS;
> + else if (rotation & DRM_MODE_ROTATE_180)
> + ch->frame_ctrl |= 2 << ROT_ENC_POS;
> + else if (rotation & DRM_MODE_ROTATE_270)
> + ch->frame_ctrl |= 3 << ROT_ENC_POS;
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-drv.c b/drivers/gpu/drm/imx/dcss/dcss-drv.c
> new file mode 100644
> index 000000000000..8dc2f85c514b
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-drv.c
> @@ -0,0 +1,138 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <drm/drm_of.h>
> +
> +#include "dcss-dev.h"
> +#include "dcss-kms.h"
> +
> +struct dcss_drv {
> + struct dcss_dev *dcss;
> + struct dcss_kms_dev *kms;
> +};
> +
> +struct dcss_dev *dcss_drv_dev_to_dcss(struct device *dev)
> +{
> + struct dcss_drv *mdrv = dev_get_drvdata(dev);
> +
> + return mdrv ? mdrv->dcss : NULL;
> +}
> +
> +struct drm_device *dcss_drv_dev_to_drm(struct device *dev)
> +{
> + struct dcss_drv *mdrv = dev_get_drvdata(dev);
> +
> + return mdrv ? &mdrv->kms->base : NULL;
> +}
> +
> +static int dcss_drv_platform_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *remote;
> + struct dcss_drv *mdrv;
> + int err = 0;
> + bool hdmi_output = true;
> +
> + if (!dev->of_node)
> + return -ENODEV;
> +
> + remote = of_graph_get_remote_node(dev->of_node, 0, 0);
> + if (!remote)
> + return -ENODEV;
> +
> + hdmi_output = !of_device_is_compatible(remote, "fsl,imx8mq-nwl-dsi");
> +
> + of_node_put(remote);
> +
> + mdrv = kzalloc(sizeof(*mdrv), GFP_KERNEL);
> + if (!mdrv)
> + return -ENOMEM;
> +
> + mdrv->dcss = dcss_dev_create(dev, hdmi_output);
> + if (IS_ERR(mdrv->dcss)) {
> + err = PTR_ERR(mdrv->dcss);
> + goto err;
> + }
> +
> + dev_set_drvdata(dev, mdrv);
> +
> + mdrv->kms = dcss_kms_attach(mdrv->dcss);
> + if (IS_ERR(mdrv->kms)) {
> + err = PTR_ERR(mdrv->kms);
> + goto dcss_shutoff;
> + }
> +
> + return 0;
> +
> +dcss_shutoff:
> + dcss_dev_destroy(mdrv->dcss);
> +
> + dev_set_drvdata(dev, NULL);
> +
> +err:
> + kfree(mdrv);
> + return err;
> +}
> +
> +static int dcss_drv_platform_remove(struct platform_device *pdev)
> +{
> + struct dcss_drv *mdrv = dev_get_drvdata(&pdev->dev);
> +
> + if (!mdrv)
> + return 0;
> +
> + dcss_kms_detach(mdrv->kms);
> + dcss_dev_destroy(mdrv->dcss);
> +
> + dev_set_drvdata(&pdev->dev, NULL);
> +
> + kfree(mdrv);
> +
> + return 0;
> +}
> +
> +static struct dcss_type_data dcss_types[] = {
> + [DCSS_IMX8MQ] = {
> + .name = "DCSS_IMX8MQ",
> + .blkctl_ofs = 0x2F000,
> + .ctxld_ofs = 0x23000,
> + .dtg_ofs = 0x20000,
> + .scaler_ofs = 0x1C000,
> + .ss_ofs = 0x1B000,
> + .dpr_ofs = 0x18000,
> + },
> +};
> +
> +static const struct of_device_id dcss_of_match[] = {
> + { .compatible = "nxp,imx8mq-dcss", .data = &dcss_types[DCSS_IMX8MQ], },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, dcss_of_match);
> +
> +static const struct dev_pm_ops dcss_dev_pm = {
> + SET_SYSTEM_SLEEP_PM_OPS(dcss_dev_suspend, dcss_dev_resume)
> + SET_RUNTIME_PM_OPS(dcss_dev_runtime_suspend,
> + dcss_dev_runtime_resume, NULL)
> +};
> +
> +static struct platform_driver dcss_platform_driver = {
> + .probe = dcss_drv_platform_probe,
> + .remove = dcss_drv_platform_remove,
> + .driver = {
> + .name = "imx-dcss",
> + .of_match_table = dcss_of_match,
> + .pm = &dcss_dev_pm,
> + },
> +};
> +
> +module_platform_driver(dcss_platform_driver);
> +
> +MODULE_AUTHOR("Laurentiu Palcu <[email protected]>");
> +MODULE_DESCRIPTION("DCSS driver for i.MX8MQ");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dtg.c b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
> new file mode 100644
> index 000000000000..30de00540f63
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dtg.c
> @@ -0,0 +1,409 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#include "dcss-dev.h"
> +
> +#define DCSS_DTG_TC_CONTROL_STATUS 0x00
> +#define CH3_EN BIT(0)
> +#define CH2_EN BIT(1)
> +#define CH1_EN BIT(2)
> +#define OVL_DATA_MODE BIT(3)
> +#define BLENDER_VIDEO_ALPHA_SEL BIT(7)
> +#define DTG_START BIT(8)
> +#define DBY_MODE_EN BIT(9)
> +#define CH1_ALPHA_SEL BIT(10)
> +#define CSS_PIX_COMP_SWAP_POS 12
> +#define CSS_PIX_COMP_SWAP_MASK GENMASK(14, 12)
> +#define DEFAULT_FG_ALPHA_POS 24
> +#define DEFAULT_FG_ALPHA_MASK GENMASK(31, 24)
> +#define DCSS_DTG_TC_DTG 0x04
> +#define DCSS_DTG_TC_DISP_TOP 0x08
> +#define DCSS_DTG_TC_DISP_BOT 0x0C
> +#define DCSS_DTG_TC_CH1_TOP 0x10
> +#define DCSS_DTG_TC_CH1_BOT 0x14
> +#define DCSS_DTG_TC_CH2_TOP 0x18
> +#define DCSS_DTG_TC_CH2_BOT 0x1C
> +#define DCSS_DTG_TC_CH3_TOP 0x20
> +#define DCSS_DTG_TC_CH3_BOT 0x24
> +#define TC_X_POS 0
> +#define TC_X_MASK GENMASK(12, 0)
> +#define TC_Y_POS 16
> +#define TC_Y_MASK GENMASK(28, 16)
> +#define DCSS_DTG_TC_CTXLD 0x28
> +#define TC_CTXLD_DB_Y_POS 0
> +#define TC_CTXLD_DB_Y_MASK GENMASK(12, 0)
> +#define TC_CTXLD_SB_Y_POS 16
> +#define TC_CTXLD_SB_Y_MASK GENMASK(28, 16)
> +#define DCSS_DTG_TC_CH1_BKRND 0x2C
> +#define DCSS_DTG_TC_CH2_BKRND 0x30
> +#define BKRND_R_Y_COMP_POS 20
> +#define BKRND_R_Y_COMP_MASK GENMASK(29, 20)
> +#define BKRND_G_U_COMP_POS 10
> +#define BKRND_G_U_COMP_MASK GENMASK(19, 10)
> +#define BKRND_B_V_COMP_POS 0
> +#define BKRND_B_V_COMP_MASK GENMASK(9, 0)
> +#define DCSS_DTG_BLENDER_DBY_RANGEINV 0x38
> +#define DCSS_DTG_BLENDER_DBY_RANGEMIN 0x3C
> +#define DCSS_DTG_BLENDER_DBY_BDP 0x40
> +#define DCSS_DTG_BLENDER_BKRND_I 0x44
> +#define DCSS_DTG_BLENDER_BKRND_P 0x48
> +#define DCSS_DTG_BLENDER_BKRND_T 0x4C
> +#define DCSS_DTG_LINE0_INT 0x50
> +#define DCSS_DTG_LINE1_INT 0x54
> +#define DCSS_DTG_BG_ALPHA_DEFAULT 0x58
> +#define DCSS_DTG_INT_STATUS 0x5C
> +#define DCSS_DTG_INT_CONTROL 0x60
> +#define DCSS_DTG_TC_CH3_BKRND 0x64
> +#define DCSS_DTG_INT_MASK 0x68
> +#define LINE0_IRQ BIT(0)
> +#define LINE1_IRQ BIT(1)
> +#define LINE2_IRQ BIT(2)
> +#define LINE3_IRQ BIT(3)
> +#define DCSS_DTG_LINE2_INT 0x6C
> +#define DCSS_DTG_LINE3_INT 0x70
> +#define DCSS_DTG_DBY_OL 0x74
> +#define DCSS_DTG_DBY_BL 0x78
> +#define DCSS_DTG_DBY_EL 0x7C
> +
> +struct dcss_dtg {
> + struct device *dev;
> + struct dcss_ctxld *ctxld;
> + void __iomem *base_reg;
> + u32 base_ofs;
> +
> + u32 ctx_id;
> +
> + bool in_use;
> +
> + u32 dis_ulc_x;
> + u32 dis_ulc_y;
> +
> + u32 control_status;
> + u32 alpha;
> + u32 alpha_cfg;
> +
> + int ctxld_kick_irq;
> + bool ctxld_kick_irq_en;
> +};
> +
> +static void dcss_dtg_write(struct dcss_dtg *dtg, u32 val, u32 ofs)
> +{
> + if (!dtg->in_use)
> + dcss_writel(val, dtg->base_reg + ofs);
> +
> + dcss_ctxld_write(dtg->ctxld, dtg->ctx_id,
> + val, dtg->base_ofs + ofs);
> +}
> +
> +static irqreturn_t dcss_dtg_irq_handler(int irq, void *data)
> +{
> + struct dcss_dtg *dtg = data;
> + u32 status;
> +
> + status = dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS);
> +
> + if (!(status & LINE0_IRQ))
> + return IRQ_NONE;
> +
> + dcss_ctxld_kick(dtg->ctxld);
> +
> + dcss_writel(status & LINE0_IRQ, dtg->base_reg + DCSS_DTG_INT_CONTROL);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int dcss_dtg_irq_config(struct dcss_dtg *dtg,
> + struct platform_device *pdev)
> +{
> + int ret;
> +
> + dtg->ctxld_kick_irq = platform_get_irq_byname(pdev, "ctxld_kick");
> + if (dtg->ctxld_kick_irq < 0)
> + return dtg->ctxld_kick_irq;
> +
> + dcss_update(0, LINE0_IRQ | LINE1_IRQ,
> + dtg->base_reg + DCSS_DTG_INT_MASK);
> +
> + ret = request_irq(dtg->ctxld_kick_irq, dcss_dtg_irq_handler,
> + 0, "dcss_ctxld_kick", dtg);
> + if (ret) {
> + dev_err(dtg->dev, "dtg: irq request failed.\n");
> + return ret;
> + }
> +
> + disable_irq(dtg->ctxld_kick_irq);
> +
> + dtg->ctxld_kick_irq_en = false;
> +
> + return 0;
> +}
> +
> +int dcss_dtg_init(struct dcss_dev *dcss, unsigned long dtg_base)
> +{
> + int ret = 0;
> + struct dcss_dtg *dtg;
> +
> + dtg = kzalloc(sizeof(*dtg), GFP_KERNEL);
> + if (!dtg)
> + return -ENOMEM;
> +
> + dcss->dtg = dtg;
> + dtg->dev = dcss->dev;
> + dtg->ctxld = dcss->ctxld;
> +
> + dtg->base_reg = ioremap(dtg_base, SZ_4K);
> + if (!dtg->base_reg) {
> + dev_err(dcss->dev, "dtg: unable to remap dtg base\n");
> + ret = -ENOMEM;
> + goto err_ioremap;
> + }
> +
> + dtg->base_ofs = dtg_base;
> + dtg->ctx_id = CTX_DB;
> +
> + dtg->alpha = 255;
> +
> + dtg->control_status |= OVL_DATA_MODE | BLENDER_VIDEO_ALPHA_SEL |
> + ((dtg->alpha << DEFAULT_FG_ALPHA_POS) & DEFAULT_FG_ALPHA_MASK);
> +
> + ret = dcss_dtg_irq_config(dtg, to_platform_device(dcss->dev));
> + if (ret)
> + goto err_irq;
> +
> + return 0;
> +
> +err_irq:
> + iounmap(dtg->base_reg);
> +
> +err_ioremap:
> + kfree(dtg);
> +
> + return ret;
> +}
> +
> +void dcss_dtg_exit(struct dcss_dtg *dtg)
> +{
> + free_irq(dtg->ctxld_kick_irq, dtg);
> +
> + if (dtg->base_reg)
> + iounmap(dtg->base_reg);
> +
> + kfree(dtg);
> +}
> +
> +void dcss_dtg_sync_set(struct dcss_dtg *dtg, struct videomode *vm)
> +{
> + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dtg->dev);
> + u16 dtg_lrc_x, dtg_lrc_y;
> + u16 dis_ulc_x, dis_ulc_y;
> + u16 dis_lrc_x, dis_lrc_y;
> + u32 sb_ctxld_trig, db_ctxld_trig;
> + u32 pixclock = vm->pixelclock;
> + u32 actual_clk;
> +
> + dtg_lrc_x = vm->hfront_porch + vm->hback_porch + vm->hsync_len +
> + vm->hactive - 1;
> + dtg_lrc_y = vm->vfront_porch + vm->vback_porch + vm->vsync_len +
> + vm->vactive - 1;
> + dis_ulc_x = vm->hsync_len + vm->hback_porch - 1;
> + dis_ulc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch - 1;
> + dis_lrc_x = vm->hsync_len + vm->hback_porch + vm->hactive - 1;
> + dis_lrc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch +
> + vm->vactive - 1;
> +
> + clk_disable_unprepare(dcss->pix_clk);
> + clk_set_rate(dcss->pix_clk, vm->pixelclock);
> + clk_prepare_enable(dcss->pix_clk);
> +
> + actual_clk = clk_get_rate(dcss->pix_clk);
> + if (pixclock != actual_clk) {
> + dev_info(dtg->dev,
> + "Pixel clock set to %u kHz instead of %u kHz.\n",
> + (actual_clk / 1000), (pixclock / 1000));
> + }
> +
> + dcss_dtg_write(dtg, ((dtg_lrc_y << TC_Y_POS) | dtg_lrc_x),
> + DCSS_DTG_TC_DTG);
> + dcss_dtg_write(dtg, ((dis_ulc_y << TC_Y_POS) | dis_ulc_x),
> + DCSS_DTG_TC_DISP_TOP);
> + dcss_dtg_write(dtg, ((dis_lrc_y << TC_Y_POS) | dis_lrc_x),
> + DCSS_DTG_TC_DISP_BOT);
> +
> + dtg->dis_ulc_x = dis_ulc_x;
> + dtg->dis_ulc_y = dis_ulc_y;
> +
> + sb_ctxld_trig = ((0 * dis_lrc_y / 100) << TC_CTXLD_SB_Y_POS) &
> + TC_CTXLD_SB_Y_MASK;
> + db_ctxld_trig = ((99 * dis_lrc_y / 100) << TC_CTXLD_DB_Y_POS) &
> + TC_CTXLD_DB_Y_MASK;
> +
> + dcss_dtg_write(dtg, sb_ctxld_trig | db_ctxld_trig, DCSS_DTG_TC_CTXLD);
> +
> + /* vblank trigger */
> + dcss_dtg_write(dtg, 0, DCSS_DTG_LINE1_INT);
> +
> + /* CTXLD trigger */
> + dcss_dtg_write(dtg, ((90 * dis_lrc_y) / 100) << 16, DCSS_DTG_LINE0_INT);
> +}
> +
> +void dcss_dtg_plane_pos_set(struct dcss_dtg *dtg, int ch_num,
> + int px, int py, int pw, int ph)
> +{
> + u16 p_ulc_x, p_ulc_y;
> + u16 p_lrc_x, p_lrc_y;
> +
> + p_ulc_x = dtg->dis_ulc_x + px;
> + p_ulc_y = dtg->dis_ulc_y + py;
> + p_lrc_x = p_ulc_x + pw;
> + p_lrc_y = p_ulc_y + ph;
> +
> + if (!px && !py && !pw && !ph) {
> + dcss_dtg_write(dtg, 0, DCSS_DTG_TC_CH1_TOP + 0x8 * ch_num);
> + dcss_dtg_write(dtg, 0, DCSS_DTG_TC_CH1_BOT + 0x8 * ch_num);
> + } else {
> + dcss_dtg_write(dtg, ((p_ulc_y << TC_Y_POS) | p_ulc_x),
> + DCSS_DTG_TC_CH1_TOP + 0x8 * ch_num);
> + dcss_dtg_write(dtg, ((p_lrc_y << TC_Y_POS) | p_lrc_x),
> + DCSS_DTG_TC_CH1_BOT + 0x8 * ch_num);
> + }
> +}
> +
> +bool dcss_dtg_global_alpha_changed(struct dcss_dtg *dtg, int ch_num, int alpha)
> +{
> + if (ch_num)
> + return false;
> +
> + return alpha != dtg->alpha;
> +}
> +
> +void dcss_dtg_plane_alpha_set(struct dcss_dtg *dtg, int ch_num,
> + const struct drm_format_info *format, int alpha)
> +{
> + /* we care about alpha only when channel 0 is concerned */
> + if (ch_num)
> + return;
> +
> + /*
> + * Use global alpha if pixel format does not have alpha channel or the
> + * user explicitly chose to use global alpha (i.e. alpha is not OPAQUE).
> + */
> + if (!format->has_alpha || alpha != 255)
> + dtg->alpha_cfg = (alpha << DEFAULT_FG_ALPHA_POS) & DEFAULT_FG_ALPHA_MASK;
> + else /* use per-pixel alpha otherwise */
> + dtg->alpha_cfg = CH1_ALPHA_SEL;
> +
> + dtg->alpha = alpha;
> +}
> +
> +void dcss_dtg_css_set(struct dcss_dtg *dtg)
> +{
> + dtg->control_status |=
> + (0x5 << CSS_PIX_COMP_SWAP_POS) & CSS_PIX_COMP_SWAP_MASK;
> +}
> +
> +void dcss_dtg_enable(struct dcss_dtg *dtg)
> +{
> + dtg->control_status |= DTG_START;
> +
> + dtg->control_status &= ~(CH1_ALPHA_SEL | DEFAULT_FG_ALPHA_MASK);
> + dtg->control_status |= dtg->alpha_cfg;
> +
> + dcss_dtg_write(dtg, dtg->control_status, DCSS_DTG_TC_CONTROL_STATUS);
> +
> + dtg->in_use = true;
> +}
> +
> +void dcss_dtg_shutoff(struct dcss_dtg *dtg)
> +{
> + dtg->control_status &= ~DTG_START;
> +
> + dcss_writel(dtg->control_status,
> + dtg->base_reg + DCSS_DTG_TC_CONTROL_STATUS);
> +
> + dtg->in_use = false;
> +}
> +
> +bool dcss_dtg_is_enabled(struct dcss_dtg *dtg)
> +{
> + return dtg->in_use;
> +}
> +
> +void dcss_dtg_ch_enable(struct dcss_dtg *dtg, int ch_num, bool en)
> +{
> + u32 ch_en_map[] = {CH1_EN, CH2_EN, CH3_EN};
> + u32 control_status;
> +
> + control_status = dtg->control_status & ~ch_en_map[ch_num];
> + control_status |= en ? ch_en_map[ch_num] : 0;
> +
> + control_status &= ~(CH1_ALPHA_SEL | DEFAULT_FG_ALPHA_MASK);
> + control_status |= dtg->alpha_cfg;
> +
> + if (dtg->control_status != control_status)
> + dcss_dtg_write(dtg, control_status, DCSS_DTG_TC_CONTROL_STATUS);
> +
> + dtg->control_status = control_status;
> +}
> +
> +void dcss_dtg_vblank_irq_enable(struct dcss_dtg *dtg, bool en)
> +{
> + u32 status;
> + u32 mask = en ? LINE1_IRQ : 0;
> +
> + if (en) {
> + status = dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS);
> + dcss_writel(status & LINE1_IRQ,
> + dtg->base_reg + DCSS_DTG_INT_CONTROL);
> + }
> +
> + dcss_update(mask, LINE1_IRQ, dtg->base_reg + DCSS_DTG_INT_MASK);
> +}
> +
> +void dcss_dtg_ctxld_kick_irq_enable(struct dcss_dtg *dtg, bool en)
> +{
> + u32 status;
> + u32 mask = en ? LINE0_IRQ : 0;
> +
> + if (en) {
> + status = dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS);
> +
> + if (!dtg->ctxld_kick_irq_en) {
> + dcss_writel(status & LINE0_IRQ,
> + dtg->base_reg + DCSS_DTG_INT_CONTROL);
> + enable_irq(dtg->ctxld_kick_irq);
> + dtg->ctxld_kick_irq_en = true;
> + dcss_update(mask, LINE0_IRQ,
> + dtg->base_reg + DCSS_DTG_INT_MASK);
> + }
> +
> + return;
> + }
> +
> + if (!dtg->ctxld_kick_irq_en)
> + return;
> +
> + disable_irq_nosync(dtg->ctxld_kick_irq);
> + dtg->ctxld_kick_irq_en = false;
> +
> + dcss_update(mask, LINE0_IRQ, dtg->base_reg + DCSS_DTG_INT_MASK);
> +}
> +
> +void dcss_dtg_vblank_irq_clear(struct dcss_dtg *dtg)
> +{
> + dcss_update(LINE1_IRQ, LINE1_IRQ, dtg->base_reg + DCSS_DTG_INT_CONTROL);
> +}
> +
> +bool dcss_dtg_vblank_irq_valid(struct dcss_dtg *dtg)
> +{
> + return !!(dcss_readl(dtg->base_reg + DCSS_DTG_INT_STATUS) & LINE1_IRQ);
> +}
> +
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.c b/drivers/gpu/drm/imx/dcss/dcss-kms.c
> new file mode 100644
> index 000000000000..3ca49d0a3e61
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-kms.c
> @@ -0,0 +1,177 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include "dcss-dev.h"
> +#include "dcss-kms.h"
> +
> +DEFINE_DRM_GEM_CMA_FOPS(dcss_cma_fops);
> +
> +static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = {
> + .fb_create = drm_gem_fb_create,
> + .output_poll_changed = drm_fb_helper_output_poll_changed,
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static struct drm_driver dcss_kms_driver = {
> + .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
> + .gem_free_object_unlocked = drm_gem_cma_free_object,
> + .gem_vm_ops = &drm_gem_cma_vm_ops,
> + .dumb_create = drm_gem_cma_dumb_create,
> +
> + .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> + .gem_prime_import = drm_gem_prime_import,
> + .gem_prime_export = drm_gem_prime_export,
> + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
> + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> + .gem_prime_vmap = drm_gem_cma_prime_vmap,
> + .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
> + .gem_prime_mmap = drm_gem_cma_prime_mmap,
> + .fops = &dcss_cma_fops,
> + .name = "imx-dcss",
> + .desc = "i.MX8MQ Display Subsystem",
> + .date = "20190917",
> + .major = 1,
> + .minor = 0,
> + .patchlevel = 0,
> +};
> +
> +static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
> + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> +};
> +
> +static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
> +{
> + struct drm_mode_config *config = &kms->base.mode_config;
> +
> + drm_mode_config_init(&kms->base);
> +
> + config->min_width = 1;
> + config->min_height = 1;
> + config->max_width = 4096;
> + config->max_height = 4096;
> + config->allow_fb_modifiers = true;
> + config->normalize_zpos = true;
> +
> + config->funcs = &dcss_drm_mode_config_funcs;
> + config->helper_private = &dcss_mode_config_helpers;
> +}
> +
> +static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +static int dcss_kms_setup_encoder(struct dcss_kms_dev *kms)
> +{
> + struct drm_device *ddev = &kms->base;
> + struct drm_encoder *encoder = &kms->encoder;
> + struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc;
> + struct drm_panel *panel;
> + struct drm_bridge *bridge;
> + int ret;
> +
> + ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
> + &panel, &bridge);
> + if (ret)
> + return ret;
> +
> + if (!bridge) {
> + dev_err(ddev->dev, "No bridge found %d.\n", ret);
> + return -ENODEV;
> + }
> +
> + encoder->possible_crtcs = drm_crtc_mask(crtc);
> +
> + ret = drm_encoder_init(&kms->base, encoder,
> + &dcss_kms_simple_encoder_funcs,
> + DRM_MODE_ENCODER_NONE, NULL);
> + if (ret) {
> + dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret);
> + return ret;
> + }
> +
> + return drm_bridge_attach(encoder, bridge, NULL, 0);
> +}
> +
> +struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
> +{
> + struct dcss_kms_dev *kms;
> + struct drm_device *drm;
> + struct dcss_crtc *crtc;
> + int ret;
> +
> + kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver,
> + struct dcss_kms_dev, base);
> + if (IS_ERR(kms))
> + return kms;
> +
> + drm = &kms->base;
> + crtc = &kms->crtc;
> +
> + drm->dev_private = dcss;
> +
> + dcss_kms_mode_config_init(kms);
> +
> + ret = drm_vblank_init(drm, 1);
> + if (ret)
> + goto cleanup_mode_config;
> +
> + drm->irq_enabled = true;
> +
> + ret = dcss_crtc_init(crtc, drm);
> + if (ret)
> + goto cleanup_mode_config;
> +
> + ret = dcss_kms_setup_encoder(kms);
> + if (ret)
> + goto cleanup_crtc;
> +
> + drm_mode_config_reset(drm);
> +
> + drm_kms_helper_poll_init(drm);
> +
> + ret = drm_dev_register(drm, 0);
> + if (ret)
> + goto cleanup_crtc;
> +
> + drm_fbdev_generic_setup(drm, 32);
> +
> + return kms;
> +
> +cleanup_crtc:
> + drm_kms_helper_poll_fini(drm);
> + dcss_crtc_deinit(crtc, drm);
> +
> +cleanup_mode_config:
> + drm_mode_config_cleanup(drm);
> + drm->dev_private = NULL;
> +
> + return ERR_PTR(ret);
> +}
> +
> +void dcss_kms_detach(struct dcss_kms_dev *kms)
> +{
> + struct drm_device *drm = &kms->base;
> +
> + drm_dev_unregister(drm);
> + drm_kms_helper_poll_fini(drm);
> + drm_atomic_helper_shutdown(drm);
> + drm_crtc_vblank_off(&kms->crtc.base);
> + drm->irq_enabled = false;
> + drm_mode_config_cleanup(drm);
> + dcss_crtc_deinit(&kms->crtc, drm);
> + drm->dev_private = NULL;
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-kms.h b/drivers/gpu/drm/imx/dcss/dcss-kms.h
> new file mode 100644
> index 000000000000..1f51c86c6986
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-kms.h
> @@ -0,0 +1,43 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#ifndef _DCSS_KMS_H_
> +#define _DCSS_KMS_H_
> +
> +#include <drm/drm_encoder.h>
> +
> +struct dcss_plane {
> + struct drm_plane base;
> +
> + int ch_num;
> +};
> +
> +struct dcss_crtc {
> + struct drm_crtc base;
> + struct drm_crtc_state *state;
> +
> + struct dcss_plane *plane[3];
> +
> + int irq;
> +
> + bool disable_ctxld_kick_irq;
> +};
> +
> +struct dcss_kms_dev {
> + struct drm_device base;
> + struct dcss_crtc crtc;
> + struct drm_encoder encoder;
> +};
> +
> +struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss);
> +void dcss_kms_detach(struct dcss_kms_dev *kms);
> +int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm);
> +void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm);
> +struct dcss_plane *dcss_plane_init(struct drm_device *drm,
> + unsigned int possible_crtcs,
> + enum drm_plane_type type,
> + unsigned int zpos);
> +
> +#endif
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-plane.c b/drivers/gpu/drm/imx/dcss/dcss-plane.c
> new file mode 100644
> index 000000000000..961d671f171b
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-plane.c
> @@ -0,0 +1,405 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +
> +#include "dcss-dev.h"
> +#include "dcss-kms.h"
> +
> +static const u32 dcss_common_formats[] = {
> + /* RGB */
> + DRM_FORMAT_ARGB8888,
> + DRM_FORMAT_XRGB8888,
> + DRM_FORMAT_ABGR8888,
> + DRM_FORMAT_XBGR8888,
> + DRM_FORMAT_RGBA8888,
> + DRM_FORMAT_RGBX8888,
> + DRM_FORMAT_BGRA8888,
> + DRM_FORMAT_BGRX8888,
> + DRM_FORMAT_XRGB2101010,
> + DRM_FORMAT_XBGR2101010,
> + DRM_FORMAT_RGBX1010102,
> + DRM_FORMAT_BGRX1010102,
> + DRM_FORMAT_ARGB2101010,
> + DRM_FORMAT_ABGR2101010,
> + DRM_FORMAT_RGBA1010102,
> + DRM_FORMAT_BGRA1010102,
> +};
> +
> +static const u64 dcss_video_format_modifiers[] = {
> + DRM_FORMAT_MOD_LINEAR,
> + DRM_FORMAT_MOD_INVALID,
> +};
> +
> +static const u64 dcss_graphics_format_modifiers[] = {
> + DRM_FORMAT_MOD_VIVANTE_TILED,
> + DRM_FORMAT_MOD_VIVANTE_SUPER_TILED,
> + DRM_FORMAT_MOD_LINEAR,
> + DRM_FORMAT_MOD_INVALID,
> +};
> +
> +static inline struct dcss_plane *to_dcss_plane(struct drm_plane *p)
> +{
> + return container_of(p, struct dcss_plane, base);
> +}
> +
> +static inline bool dcss_plane_fb_is_linear(const struct drm_framebuffer *fb)
> +{
> + return ((fb->flags & DRM_MODE_FB_MODIFIERS) == 0) ||
> + ((fb->flags & DRM_MODE_FB_MODIFIERS) != 0 &&
> + fb->modifier == DRM_FORMAT_MOD_LINEAR);
> +}
> +
> +static void dcss_plane_destroy(struct drm_plane *plane)
> +{
> + struct dcss_plane *dcss_plane = container_of(plane, struct dcss_plane,
> + base);
> +
> + drm_plane_cleanup(plane);
> + kfree(dcss_plane);
> +}
> +
> +static bool dcss_plane_format_mod_supported(struct drm_plane *plane,
> + u32 format,
> + u64 modifier)
> +{
> + switch (plane->type) {
> + case DRM_PLANE_TYPE_PRIMARY:
> + switch (format) {
> + case DRM_FORMAT_ARGB8888:
> + case DRM_FORMAT_XRGB8888:
> + case DRM_FORMAT_ARGB2101010:
> + return modifier == DRM_FORMAT_MOD_LINEAR ||
> + modifier == DRM_FORMAT_MOD_VIVANTE_TILED ||
> + modifier == DRM_FORMAT_MOD_VIVANTE_SUPER_TILED;
> + default:
> + return modifier == DRM_FORMAT_MOD_LINEAR;
> + }
> + break;
> + case DRM_PLANE_TYPE_OVERLAY:
> + return modifier == DRM_FORMAT_MOD_LINEAR;
> + default:
> + return false;
> + }
> +}
> +
> +static const struct drm_plane_funcs dcss_plane_funcs = {
> + .update_plane = drm_atomic_helper_update_plane,
> + .disable_plane = drm_atomic_helper_disable_plane,
> + .destroy = dcss_plane_destroy,
> + .reset = drm_atomic_helper_plane_reset,
> + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> + .format_mod_supported = dcss_plane_format_mod_supported,
> +};
> +
> +static bool dcss_plane_can_rotate(const struct drm_format_info *format,
> + bool mod_present, u64 modifier,
> + unsigned int rotation)
> +{
> + bool linear_format = !mod_present ||
> + (mod_present && modifier == DRM_FORMAT_MOD_LINEAR);
> + u32 supported_rotation = DRM_MODE_ROTATE_0;
> +
> + if (!format->is_yuv && linear_format)
> + supported_rotation = DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
> + DRM_MODE_REFLECT_MASK;
> + else if (!format->is_yuv &&
> + modifier == DRM_FORMAT_MOD_VIVANTE_TILED)
> + supported_rotation = DRM_MODE_ROTATE_MASK |
> + DRM_MODE_REFLECT_MASK;
> + else if (format->is_yuv && linear_format &&
> + (format->format == DRM_FORMAT_NV12 ||
> + format->format == DRM_FORMAT_NV21))
> + supported_rotation = DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
> + DRM_MODE_REFLECT_MASK;
> +
> + return !!(rotation & supported_rotation);
> +}
> +
> +static bool dcss_plane_is_source_size_allowed(u16 src_w, u16 src_h, u32 pix_fmt)
> +{
> + if (src_w < 64 &&
> + (pix_fmt == DRM_FORMAT_NV12 || pix_fmt == DRM_FORMAT_NV21))
> + return false;
> + else if (src_w < 32 &&
> + (pix_fmt == DRM_FORMAT_UYVY || pix_fmt == DRM_FORMAT_VYUY ||
> + pix_fmt == DRM_FORMAT_YUYV || pix_fmt == DRM_FORMAT_YVYU))
> + return false;
> +
> + return src_w >= 16 && src_h >= 8;
> +}
> +
> +static int dcss_plane_atomic_check(struct drm_plane *plane,
> + struct drm_plane_state *state)
> +{
> + struct dcss_plane *dcss_plane = to_dcss_plane(plane);
> + struct dcss_dev *dcss = plane->dev->dev_private;
> + struct drm_framebuffer *fb = state->fb;
> + bool is_primary_plane = plane->type == DRM_PLANE_TYPE_PRIMARY;
> + struct drm_gem_cma_object *cma_obj;
> + struct drm_crtc_state *crtc_state;
> + int hdisplay, vdisplay;
> + int min, max;
> + int ret;
> +
> + if (!fb || !state->crtc)
> + return 0;
> +
> + cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> + WARN_ON(!cma_obj);
> +
> + crtc_state = drm_atomic_get_existing_crtc_state(state->state,
> + state->crtc);
> +
> + hdisplay = crtc_state->adjusted_mode.hdisplay;
> + vdisplay = crtc_state->adjusted_mode.vdisplay;
> +
> + if (!dcss_plane_is_source_size_allowed(state->src_w >> 16,
> + state->src_h >> 16,
> + fb->format->format)) {
> + DRM_DEBUG_KMS("Source plane size is not allowed!\n");
> + return -EINVAL;
> + }
> +
> + dcss_scaler_get_min_max_ratios(dcss->scaler, dcss_plane->ch_num,
> + &min, &max);
> +
> + ret = drm_atomic_helper_check_plane_state(state, crtc_state,
> + min, max, !is_primary_plane,
> + false);
> + if (ret)
> + return ret;
> +
> + if (!state->visible)
> + return 0;
> +
> + if (!dcss_plane_can_rotate(fb->format,
> + !!(fb->flags & DRM_MODE_FB_MODIFIERS),
> + fb->modifier,
> + state->rotation)) {
> + DRM_DEBUG_KMS("requested rotation is not allowed!\n");
> + return -EINVAL;
> + }
> +
> + if ((state->crtc_x < 0 || state->crtc_y < 0 ||
> + state->crtc_x + state->crtc_w > hdisplay ||
> + state->crtc_y + state->crtc_h > vdisplay) &&
> + !dcss_plane_fb_is_linear(fb)) {
> + DRM_DEBUG_KMS("requested cropping operation is not allowed!\n");
> + return -EINVAL;
> + }
> +
> + if ((fb->flags & DRM_MODE_FB_MODIFIERS) &&
> + !plane->funcs->format_mod_supported(plane,
> + fb->format->format,
> + fb->modifier)) {
> + DRM_DEBUG_KMS("Invalid modifier: %llx", fb->modifier);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static void dcss_plane_atomic_set_base(struct dcss_plane *dcss_plane)
> +{
> + struct drm_plane *plane = &dcss_plane->base;
> + struct drm_plane_state *state = plane->state;
> + struct dcss_dev *dcss = plane->dev->dev_private;
> + struct drm_framebuffer *fb = state->fb;
> + const struct drm_format_info *format = fb->format;
> + struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> + unsigned long p1_ba = 0, p2_ba = 0;
> +
> + if (!format->is_yuv ||
> + format->format == DRM_FORMAT_NV12 ||
> + format->format == DRM_FORMAT_NV21)
> + p1_ba = cma_obj->paddr + fb->offsets[0] +
> + fb->pitches[0] * (state->src.y1 >> 16) +
> + format->char_per_block[0] * (state->src.x1 >> 16);
> + else if (format->format == DRM_FORMAT_UYVY ||
> + format->format == DRM_FORMAT_VYUY ||
> + format->format == DRM_FORMAT_YUYV ||
> + format->format == DRM_FORMAT_YVYU)
> + p1_ba = cma_obj->paddr + fb->offsets[0] +
> + fb->pitches[0] * (state->src.y1 >> 16) +
> + 2 * format->char_per_block[0] * (state->src.x1 >> 17);
> +
> + if (format->format == DRM_FORMAT_NV12 ||
> + format->format == DRM_FORMAT_NV21)
> + p2_ba = cma_obj->paddr + fb->offsets[1] +
> + (((fb->pitches[1] >> 1) * (state->src.y1 >> 17) +
> + (state->src.x1 >> 17)) << 1);
> +
> + dcss_dpr_addr_set(dcss->dpr, dcss_plane->ch_num, p1_ba, p2_ba,
> + fb->pitches[0]);
> +}
> +
> +static bool dcss_plane_needs_setup(struct drm_plane_state *state,
> + struct drm_plane_state *old_state)
> +{
> + struct drm_framebuffer *fb = state->fb;
> + struct drm_framebuffer *old_fb = old_state->fb;
> +
> + return state->crtc_x != old_state->crtc_x ||
> + state->crtc_y != old_state->crtc_y ||
> + state->crtc_w != old_state->crtc_w ||
> + state->crtc_h != old_state->crtc_h ||
> + state->src_x != old_state->src_x ||
> + state->src_y != old_state->src_y ||
> + state->src_w != old_state->src_w ||
> + state->src_h != old_state->src_h ||
> + fb->format->format != old_fb->format->format ||
> + fb->modifier != old_fb->modifier ||
> + state->rotation != old_state->rotation;
> +}
> +
> +static void dcss_plane_atomic_update(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct drm_plane_state *state = plane->state;
> + struct dcss_plane *dcss_plane = to_dcss_plane(plane);
> + struct dcss_dev *dcss = plane->dev->dev_private;
> + struct drm_framebuffer *fb = state->fb;
> + u32 pixel_format;
> + struct drm_crtc_state *crtc_state;
> + bool modifiers_present;
> + u32 src_w, src_h, dst_w, dst_h;
> + struct drm_rect src, dst;
> + bool enable = true;
> +
> + if (!fb || !state->crtc || !state->visible)
> + return;
> +
> + pixel_format = state->fb->format->format;
> + crtc_state = state->crtc->state;
> + modifiers_present = !!(fb->flags & DRM_MODE_FB_MODIFIERS);
> +
> + if (old_state->fb && !drm_atomic_crtc_needs_modeset(crtc_state) &&
> + !dcss_plane_needs_setup(state, old_state)) {
> + dcss_plane_atomic_set_base(dcss_plane);
> + return;
> + }
> +
> + src = plane->state->src;
> + dst = plane->state->dst;
> +
> + /*
> + * The width and height after clipping.
> + */
> + src_w = drm_rect_width(&src) >> 16;
> + src_h = drm_rect_height(&src) >> 16;
> + dst_w = drm_rect_width(&dst);
> + dst_h = drm_rect_height(&dst);
> +
> + if (plane->type == DRM_PLANE_TYPE_OVERLAY &&
> + modifiers_present && fb->modifier == DRM_FORMAT_MOD_LINEAR)
> + modifiers_present = false;
> +
> + dcss_dpr_format_set(dcss->dpr, dcss_plane->ch_num, state->fb->format,
> + modifiers_present ? fb->modifier :
> + DRM_FORMAT_MOD_LINEAR);
> + dcss_dpr_set_res(dcss->dpr, dcss_plane->ch_num, src_w, src_h);
> + dcss_dpr_set_rotation(dcss->dpr, dcss_plane->ch_num,
> + state->rotation);
> +
> + dcss_plane_atomic_set_base(dcss_plane);
> +
> + dcss_scaler_setup(dcss->scaler, dcss_plane->ch_num,
> + state->fb->format, src_w, src_h,
> + dst_w, dst_h,
> + drm_mode_vrefresh(&crtc_state->mode));
> +
> + dcss_dtg_plane_pos_set(dcss->dtg, dcss_plane->ch_num,
> + dst.x1, dst.y1, dst_w, dst_h);
> + dcss_dtg_plane_alpha_set(dcss->dtg, dcss_plane->ch_num,
> + fb->format, state->alpha >> 8);
> +
> + if (!dcss_plane->ch_num && (state->alpha >> 8) == 0)
> + enable = false;
> +
> + dcss_dpr_enable(dcss->dpr, dcss_plane->ch_num, enable);
> + dcss_scaler_ch_enable(dcss->scaler, dcss_plane->ch_num, enable);
> +
> + if (!enable)
> + dcss_dtg_plane_pos_set(dcss->dtg, dcss_plane->ch_num,
> + 0, 0, 0, 0);
> +
> + dcss_dtg_ch_enable(dcss->dtg, dcss_plane->ch_num, enable);
> +}
> +
> +static void dcss_plane_atomic_disable(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct dcss_plane *dcss_plane = to_dcss_plane(plane);
> + struct dcss_dev *dcss = plane->dev->dev_private;
> +
> + dcss_dpr_enable(dcss->dpr, dcss_plane->ch_num, false);
> + dcss_scaler_ch_enable(dcss->scaler, dcss_plane->ch_num, false);
> + dcss_dtg_plane_pos_set(dcss->dtg, dcss_plane->ch_num, 0, 0, 0, 0);
> + dcss_dtg_ch_enable(dcss->dtg, dcss_plane->ch_num, false);
> +}
> +
> +static const struct drm_plane_helper_funcs dcss_plane_helper_funcs = {
> + .prepare_fb = drm_gem_fb_prepare_fb,
> + .atomic_check = dcss_plane_atomic_check,
> + .atomic_update = dcss_plane_atomic_update,
> + .atomic_disable = dcss_plane_atomic_disable,
> +};
> +
> +struct dcss_plane *dcss_plane_init(struct drm_device *drm,
> + unsigned int possible_crtcs,
> + enum drm_plane_type type,
> + unsigned int zpos)
> +{
> + struct dcss_plane *dcss_plane;
> + const u64 *format_modifiers = dcss_video_format_modifiers;
> + int ret;
> +
> + if (zpos > 2)
> + return ERR_PTR(-EINVAL);
> +
> + dcss_plane = kzalloc(sizeof(*dcss_plane), GFP_KERNEL);
> + if (!dcss_plane) {
> + DRM_ERROR("failed to allocate plane\n");
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + if (type == DRM_PLANE_TYPE_PRIMARY)
> + format_modifiers = dcss_graphics_format_modifiers;
> +
> + ret = drm_universal_plane_init(drm, &dcss_plane->base, possible_crtcs,
> + &dcss_plane_funcs, dcss_common_formats,
> + ARRAY_SIZE(dcss_common_formats),
> + format_modifiers, type, NULL);
> + if (ret) {
> + DRM_ERROR("failed to initialize plane\n");
> + kfree(dcss_plane);
> + return ERR_PTR(ret);
> + }
> +
> + drm_plane_helper_add(&dcss_plane->base, &dcss_plane_helper_funcs);
> +
> + ret = drm_plane_create_zpos_immutable_property(&dcss_plane->base, zpos);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + drm_plane_create_rotation_property(&dcss_plane->base,
> + DRM_MODE_ROTATE_0,
> + DRM_MODE_ROTATE_0 |
> + DRM_MODE_ROTATE_90 |
> + DRM_MODE_ROTATE_180 |
> + DRM_MODE_ROTATE_270 |
> + DRM_MODE_REFLECT_X |
> + DRM_MODE_REFLECT_Y);
> +
> + dcss_plane->ch_num = zpos;
> +
> + return dcss_plane;
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-scaler.c b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
> new file mode 100644
> index 000000000000..cd21905de580
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-scaler.c
> @@ -0,0 +1,826 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + *
> + * Scaling algorithms were contributed by Dzung Hoang <[email protected]>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/slab.h>
> +
> +#include "dcss-dev.h"
> +
> +#define DCSS_SCALER_CTRL 0x00
> +#define SCALER_EN BIT(0)
> +#define REPEAT_EN BIT(4)
> +#define SCALE2MEM_EN BIT(8)
> +#define MEM2OFIFO_EN BIT(12)
> +#define DCSS_SCALER_OFIFO_CTRL 0x04
> +#define OFIFO_LOW_THRES_POS 0
> +#define OFIFO_LOW_THRES_MASK GENMASK(9, 0)
> +#define OFIFO_HIGH_THRES_POS 16
> +#define OFIFO_HIGH_THRES_MASK GENMASK(25, 16)
> +#define UNDERRUN_DETECT_CLR BIT(26)
> +#define LOW_THRES_DETECT_CLR BIT(27)
> +#define HIGH_THRES_DETECT_CLR BIT(28)
> +#define UNDERRUN_DETECT_EN BIT(29)
> +#define LOW_THRES_DETECT_EN BIT(30)
> +#define HIGH_THRES_DETECT_EN BIT(31)
> +#define DCSS_SCALER_SDATA_CTRL 0x08
> +#define YUV_EN BIT(0)
> +#define RTRAM_8LINES BIT(1)
> +#define Y_UV_BYTE_SWAP BIT(4)
> +#define A2R10G10B10_FORMAT_POS 8
> +#define A2R10G10B10_FORMAT_MASK GENMASK(11, 8)
> +#define DCSS_SCALER_BIT_DEPTH 0x0C
> +#define LUM_BIT_DEPTH_POS 0
> +#define LUM_BIT_DEPTH_MASK GENMASK(1, 0)
> +#define CHR_BIT_DEPTH_POS 4
> +#define CHR_BIT_DEPTH_MASK GENMASK(5, 4)
> +#define DCSS_SCALER_SRC_FORMAT 0x10
> +#define DCSS_SCALER_DST_FORMAT 0x14
> +#define FORMAT_MASK GENMASK(1, 0)
> +#define DCSS_SCALER_SRC_LUM_RES 0x18
> +#define DCSS_SCALER_SRC_CHR_RES 0x1C
> +#define DCSS_SCALER_DST_LUM_RES 0x20
> +#define DCSS_SCALER_DST_CHR_RES 0x24
> +#define WIDTH_POS 0
> +#define WIDTH_MASK GENMASK(11, 0)
> +#define HEIGHT_POS 16
> +#define HEIGHT_MASK GENMASK(27, 16)
> +#define DCSS_SCALER_V_LUM_START 0x48
> +#define V_START_MASK GENMASK(15, 0)
> +#define DCSS_SCALER_V_LUM_INC 0x4C
> +#define V_INC_MASK GENMASK(15, 0)
> +#define DCSS_SCALER_H_LUM_START 0x50
> +#define H_START_MASK GENMASK(18, 0)
> +#define DCSS_SCALER_H_LUM_INC 0x54
> +#define H_INC_MASK GENMASK(15, 0)
> +#define DCSS_SCALER_V_CHR_START 0x58
> +#define DCSS_SCALER_V_CHR_INC 0x5C
> +#define DCSS_SCALER_H_CHR_START 0x60
> +#define DCSS_SCALER_H_CHR_INC 0x64
> +#define DCSS_SCALER_COEF_VLUM 0x80
> +#define DCSS_SCALER_COEF_HLUM 0x140
> +#define DCSS_SCALER_COEF_VCHR 0x200
> +#define DCSS_SCALER_COEF_HCHR 0x300
> +
> +struct dcss_scaler_ch {
> + void __iomem *base_reg;
> + u32 base_ofs;
> + struct dcss_scaler *scl;
> +
> + u32 sdata_ctrl;
> + u32 scaler_ctrl;
> +
> + bool scaler_ctrl_chgd;
> +
> + u32 c_vstart;
> + u32 c_hstart;
> +};
> +
> +struct dcss_scaler {
> + struct device *dev;
> +
> + struct dcss_ctxld *ctxld;
> + u32 ctx_id;
> +
> + struct dcss_scaler_ch ch[3];
> +};
> +
> +/* scaler coefficients generator */
> +#define PSC_FRAC_BITS 30
> +#define PSC_FRAC_SCALE BIT(PSC_FRAC_BITS)
> +#define PSC_BITS_FOR_PHASE 4
> +#define PSC_NUM_PHASES 16
> +#define PSC_STORED_PHASES (PSC_NUM_PHASES / 2 + 1)
> +#define PSC_NUM_TAPS 7
> +#define PSC_NUM_TAPS_RGBA 5
> +#define PSC_COEFF_PRECISION 10
> +#define PSC_PHASE_FRACTION_BITS 13
> +#define PSC_PHASE_MASK (PSC_NUM_PHASES - 1)
> +#define PSC_Q_FRACTION 19
> +#define PSC_Q_ROUND_OFFSET (1 << (PSC_Q_FRACTION - 1))
> +
> +/**
> + * mult_q() - Performs fixed-point multiplication.
> + * @A: multiplier
> + * @B: multiplicand
> + */
> +static int mult_q(int A, int B)
> +{
> + int result;
> + s64 temp;
> +
> + temp = (int64_t)A * (int64_t)B;
> + temp += PSC_Q_ROUND_OFFSET;
> + result = (int)(temp >> PSC_Q_FRACTION);
> + return result;
> +}
> +
> +/**
> + * div_q() - Performs fixed-point division.
> + * @A: dividend
> + * @B: divisor
> + */
> +static int div_q(int A, int B)
> +{
> + int result;
> + s64 temp;
> +
> + temp = (int64_t)A << PSC_Q_FRACTION;
> + if ((temp >= 0 && B >= 0) || (temp < 0 && B < 0))
> + temp += B / 2;
> + else
> + temp -= B / 2;
> +
> + result = (int)(temp / B);
> + return result;
> +}
> +
> +/**
> + * exp_approx_q() - Compute approximation to exp(x) function using Taylor
> + * series.
> + * @x: fixed-point argument of exp function
> + */
> +static int exp_approx_q(int x)
> +{
> + int sum = 1 << PSC_Q_FRACTION;
> + int term = 1 << PSC_Q_FRACTION;
> +
> + term = mult_q(term, div_q(x, 1 << PSC_Q_FRACTION));
> + sum += term;
> + term = mult_q(term, div_q(x, 2 << PSC_Q_FRACTION));
> + sum += term;
> + term = mult_q(term, div_q(x, 3 << PSC_Q_FRACTION));
> + sum += term;
> + term = mult_q(term, div_q(x, 4 << PSC_Q_FRACTION));
> + sum += term;
> +
> + return sum;
> +}
> +
> +/**
> + * dcss_scaler_gaussian_filter() - Generate gaussian prototype filter.
> + * @fc_q: fixed-point cutoff frequency normalized to range [0, 1]
> + * @use_5_taps: indicates whether to use 5 taps or 7 taps
> + * @coef: output filter coefficients
> + */
> +static void dcss_scaler_gaussian_filter(int fc_q, bool use_5_taps,
> + bool phase0_identity,
> + int coef[][PSC_NUM_TAPS])
> +{
> + int sigma_q, g0_q, g1_q, g2_q;
> + int tap_cnt1, tap_cnt2, tap_idx, phase_cnt;
> + int mid;
> + int phase;
> + int i;
> + int taps;
> +
> + if (use_5_taps)
> + for (phase = 0; phase < PSC_STORED_PHASES; phase++) {
> + coef[phase][0] = 0;
> + coef[phase][PSC_NUM_TAPS - 1] = 0;
> + }
> +
> + /* seed coefficient scanner */
> + taps = use_5_taps ? PSC_NUM_TAPS_RGBA : PSC_NUM_TAPS;
> + mid = (PSC_NUM_PHASES * taps) / 2 - 1;
> + phase_cnt = (PSC_NUM_PHASES * (PSC_NUM_TAPS + 1)) / 2;
> + tap_cnt1 = (PSC_NUM_PHASES * PSC_NUM_TAPS) / 2;
> + tap_cnt2 = (PSC_NUM_PHASES * PSC_NUM_TAPS) / 2;
> +
> + /* seed gaussian filter generator */
> + sigma_q = div_q(PSC_Q_ROUND_OFFSET, fc_q);
> + g0_q = 1 << PSC_Q_FRACTION;
> + g1_q = exp_approx_q(div_q(-PSC_Q_ROUND_OFFSET,
> + mult_q(sigma_q, sigma_q)));
> + g2_q = mult_q(g1_q, g1_q);
> + coef[phase_cnt & PSC_PHASE_MASK][tap_cnt1 >> PSC_BITS_FOR_PHASE] = g0_q;
> +
> + for (i = 0; i < mid; i++) {
> + phase_cnt++;
> + tap_cnt1--;
> + tap_cnt2++;
> +
> + g0_q = mult_q(g0_q, g1_q);
> + g1_q = mult_q(g1_q, g2_q);
> +
> + if ((phase_cnt & PSC_PHASE_MASK) <= 8) {
> + tap_idx = tap_cnt1 >> PSC_BITS_FOR_PHASE;
> + coef[phase_cnt & PSC_PHASE_MASK][tap_idx] = g0_q;
> + }
> + if (((-phase_cnt) & PSC_PHASE_MASK) <= 8) {
> + tap_idx = tap_cnt2 >> PSC_BITS_FOR_PHASE;
> + coef[(-phase_cnt) & PSC_PHASE_MASK][tap_idx] = g0_q;
> + }
> + }
> +
> + phase_cnt++;
> + tap_cnt1--;
> + coef[phase_cnt & PSC_PHASE_MASK][tap_cnt1 >> PSC_BITS_FOR_PHASE] = 0;
> +
> + /* override phase 0 with identity filter if specified */
> + if (phase0_identity)
> + for (i = 0; i < PSC_NUM_TAPS; i++)
> + coef[0][i] = i == (PSC_NUM_TAPS >> 1) ?
> + (1 << PSC_COEFF_PRECISION) : 0;
> +
> + /* normalize coef */
> + for (phase = 0; phase < PSC_STORED_PHASES; phase++) {
> + int sum = 0;
> + s64 ll_temp;
> +
> + for (i = 0; i < PSC_NUM_TAPS; i++)
> + sum += coef[phase][i];
> + for (i = 0; i < PSC_NUM_TAPS; i++) {
> + ll_temp = coef[phase][i];
> + ll_temp <<= PSC_COEFF_PRECISION;
> + ll_temp += sum >> 1;
> + ll_temp /= sum;
> + coef[phase][i] = (int)ll_temp;
> + }
> + }
> +}
> +
> +/**
> + * dcss_scaler_filter_design() - Compute filter coefficients using
> + * Gaussian filter.
> + * @src_length: length of input
> + * @dst_length: length of output
> + * @use_5_taps: 0 for 7 taps per phase, 1 for 5 taps
> + * @coef: output coefficients
> + */
> +static void dcss_scaler_filter_design(int src_length, int dst_length,
> + bool use_5_taps, bool phase0_identity,
> + int coef[][PSC_NUM_TAPS])
> +{
> + int fc_q;
> +
> + /* compute cutoff frequency */
> + if (dst_length >= src_length)
> + fc_q = div_q(1, PSC_NUM_PHASES);
> + else
> + fc_q = div_q(dst_length, src_length * PSC_NUM_PHASES);
> +
> + /* compute gaussian filter coefficients */
> + dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef);
> +}
> +
> +static void dcss_scaler_write(struct dcss_scaler_ch *ch, u32 val, u32 ofs)
> +{
> + struct dcss_scaler *scl = ch->scl;
> +
> + dcss_ctxld_write(scl->ctxld, scl->ctx_id, val, ch->base_ofs + ofs);
> +}
> +
> +static int dcss_scaler_ch_init_all(struct dcss_scaler *scl,
> + unsigned long scaler_base)
> +{
> + struct dcss_scaler_ch *ch;
> + int i;
> +
> + for (i = 0; i < 3; i++) {
> + ch = &scl->ch[i];
> +
> + ch->base_ofs = scaler_base + i * 0x400;
> +
> + ch->base_reg = ioremap(ch->base_ofs, SZ_4K);
> + if (!ch->base_reg) {
> + dev_err(scl->dev, "scaler: unable to remap ch base\n");
> + return -ENOMEM;
> + }
> +
> + ch->scl = scl;
> + }
> +
> + return 0;
> +}
> +
> +int dcss_scaler_init(struct dcss_dev *dcss, unsigned long scaler_base)
> +{
> + struct dcss_scaler *scaler;
> +
> + scaler = kzalloc(sizeof(*scaler), GFP_KERNEL);
> + if (!scaler)
> + return -ENOMEM;
> +
> + dcss->scaler = scaler;
> + scaler->dev = dcss->dev;
> + scaler->ctxld = dcss->ctxld;
> + scaler->ctx_id = CTX_SB_HP;
> +
> + if (dcss_scaler_ch_init_all(scaler, scaler_base)) {
> + int i;
> +
> + for (i = 0; i < 3; i++) {
> + if (scaler->ch[i].base_reg)
> + iounmap(scaler->ch[i].base_reg);
> + }
> +
> + kfree(scaler);
> +
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +void dcss_scaler_exit(struct dcss_scaler *scl)
> +{
> + int ch_no;
> +
> + for (ch_no = 0; ch_no < 3; ch_no++) {
> + struct dcss_scaler_ch *ch = &scl->ch[ch_no];
> +
> + dcss_writel(0, ch->base_reg + DCSS_SCALER_CTRL);
> +
> + if (ch->base_reg)
> + iounmap(ch->base_reg);
> + }
> +
> + kfree(scl);
> +}
> +
> +void dcss_scaler_ch_enable(struct dcss_scaler *scl, int ch_num, bool en)
> +{
> + struct dcss_scaler_ch *ch = &scl->ch[ch_num];
> + u32 scaler_ctrl;
> +
> + scaler_ctrl = en ? SCALER_EN | REPEAT_EN : 0;
> +
> + if (en)
> + dcss_scaler_write(ch, ch->sdata_ctrl, DCSS_SCALER_SDATA_CTRL);
> +
> + if (ch->scaler_ctrl != scaler_ctrl)
> + ch->scaler_ctrl_chgd = true;
> +
> + ch->scaler_ctrl = scaler_ctrl;
> +}
> +
> +static void dcss_scaler_yuv_enable(struct dcss_scaler_ch *ch, bool en)
> +{
> + ch->sdata_ctrl &= ~YUV_EN;
> + ch->sdata_ctrl |= en ? YUV_EN : 0;
> +}
> +
> +static void dcss_scaler_rtr_8lines_enable(struct dcss_scaler_ch *ch, bool en)
> +{
> + ch->sdata_ctrl &= ~RTRAM_8LINES;
> + ch->sdata_ctrl |= en ? RTRAM_8LINES : 0;
> +}
> +
> +static void dcss_scaler_bit_depth_set(struct dcss_scaler_ch *ch, int depth)
> +{
> + u32 val;
> +
> + val = depth == 30 ? 2 : 0;
> +
> + dcss_scaler_write(ch,
> + ((val << CHR_BIT_DEPTH_POS) & CHR_BIT_DEPTH_MASK) |
> + ((val << LUM_BIT_DEPTH_POS) & LUM_BIT_DEPTH_MASK),
> + DCSS_SCALER_BIT_DEPTH);
> +}
> +
> +enum buffer_format {
> + BUF_FMT_YUV420,
> + BUF_FMT_YUV422,
> + BUF_FMT_ARGB8888_YUV444,
> +};
> +
> +enum chroma_location {
> + PSC_LOC_HORZ_0_VERT_1_OVER_4 = 0,
> + PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4 = 1,
> + PSC_LOC_HORZ_0_VERT_0 = 2,
> + PSC_LOC_HORZ_1_OVER_4_VERT_0 = 3,
> + PSC_LOC_HORZ_0_VERT_1_OVER_2 = 4,
> + PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2 = 5
> +};
> +
> +static void dcss_scaler_format_set(struct dcss_scaler_ch *ch,
> + enum buffer_format src_fmt,
> + enum buffer_format dst_fmt)
> +{
> + dcss_scaler_write(ch, src_fmt, DCSS_SCALER_SRC_FORMAT);
> + dcss_scaler_write(ch, dst_fmt, DCSS_SCALER_DST_FORMAT);
> +}
> +
> +static void dcss_scaler_res_set(struct dcss_scaler_ch *ch,
> + int src_xres, int src_yres,
> + int dst_xres, int dst_yres,
> + u32 pix_format, enum buffer_format dst_format)
> +{
> + u32 lsrc_xres, lsrc_yres, csrc_xres, csrc_yres;
> + u32 ldst_xres, ldst_yres, cdst_xres, cdst_yres;
> + bool src_is_444 = true;
> +
> + lsrc_xres = src_xres;
> + csrc_xres = src_xres;
> + lsrc_yres = src_yres;
> + csrc_yres = src_yres;
> + ldst_xres = dst_xres;
> + cdst_xres = dst_xres;
> + ldst_yres = dst_yres;
> + cdst_yres = dst_yres;
> +
> + if (pix_format == DRM_FORMAT_UYVY || pix_format == DRM_FORMAT_VYUY ||
> + pix_format == DRM_FORMAT_YUYV || pix_format == DRM_FORMAT_YVYU) {
> + csrc_xres >>= 1;
> + src_is_444 = false;
> + } else if (pix_format == DRM_FORMAT_NV12 ||
> + pix_format == DRM_FORMAT_NV21) {
> + csrc_xres >>= 1;
> + csrc_yres >>= 1;
> + src_is_444 = false;
> + }
> +
> + if (dst_format == BUF_FMT_YUV422)
> + cdst_xres >>= 1;
> +
> + /* for 4:4:4 to 4:2:2 conversion, source height should be 1 less */
> + if (src_is_444 && dst_format == BUF_FMT_YUV422) {
> + lsrc_yres--;
> + csrc_yres--;
> + }
> +
> + dcss_scaler_write(ch, (((lsrc_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
> + (((lsrc_xres - 1) << WIDTH_POS) & WIDTH_MASK),
> + DCSS_SCALER_SRC_LUM_RES);
> + dcss_scaler_write(ch, (((csrc_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
> + (((csrc_xres - 1) << WIDTH_POS) & WIDTH_MASK),
> + DCSS_SCALER_SRC_CHR_RES);
> + dcss_scaler_write(ch, (((ldst_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
> + (((ldst_xres - 1) << WIDTH_POS) & WIDTH_MASK),
> + DCSS_SCALER_DST_LUM_RES);
> + dcss_scaler_write(ch, (((cdst_yres - 1) << HEIGHT_POS) & HEIGHT_MASK) |
> + (((cdst_xres - 1) << WIDTH_POS) & WIDTH_MASK),
> + DCSS_SCALER_DST_CHR_RES);
> +}
> +
> +#define downscale_fp(factor, fp_pos) ((factor) << (fp_pos))
> +#define upscale_fp(factor, fp_pos) ((1 << (fp_pos)) / (factor))
> +
> +struct dcss_scaler_factors {
> + int downscale;
> + int upscale;
> +};
> +
> +static const struct dcss_scaler_factors dcss_scaler_factors[] = {
> + {3, 8}, {5, 8}, {5, 8},
> +};
> +
> +static void dcss_scaler_fractions_set(struct dcss_scaler_ch *ch,
> + int src_xres, int src_yres,
> + int dst_xres, int dst_yres,
> + u32 src_format, u32 dst_format,
> + enum chroma_location src_chroma_loc)
> +{
> + int src_c_xres, src_c_yres, dst_c_xres, dst_c_yres;
> + u32 l_vinc, l_hinc, c_vinc, c_hinc;
> + u32 c_vstart, c_hstart;
> +
> + src_c_xres = src_xres;
> + src_c_yres = src_yres;
> + dst_c_xres = dst_xres;
> + dst_c_yres = dst_yres;
> +
> + c_vstart = 0;
> + c_hstart = 0;
> +
> + /* adjustments for source chroma location */
> + if (src_format == BUF_FMT_YUV420) {
> + /* vertical input chroma position adjustment */
> + switch (src_chroma_loc) {
> + case PSC_LOC_HORZ_0_VERT_1_OVER_4:
> + case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4:
> + /*
> + * move chroma up to first luma line
> + * (1/4 chroma input line spacing)
> + */
> + c_vstart -= (1 << (PSC_PHASE_FRACTION_BITS - 2));
> + break;
> + case PSC_LOC_HORZ_0_VERT_1_OVER_2:
> + case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2:
> + /*
> + * move chroma up to first luma line
> + * (1/2 chroma input line spacing)
> + */
> + c_vstart -= (1 << (PSC_PHASE_FRACTION_BITS - 1));
> + break;
> + default:
> + break;
> + }
> + /* horizontal input chroma position adjustment */
> + switch (src_chroma_loc) {
> + case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_4:
> + case PSC_LOC_HORZ_1_OVER_4_VERT_0:
> + case PSC_LOC_HORZ_1_OVER_4_VERT_1_OVER_2:
> + /* move chroma left 1/4 chroma input sample spacing */
> + c_hstart -= (1 << (PSC_PHASE_FRACTION_BITS - 2));
> + break;
> + default:
> + break;
> + }
> + }
> +
> + /* adjustments to chroma resolution */
> + if (src_format == BUF_FMT_YUV420) {
> + src_c_xres >>= 1;
> + src_c_yres >>= 1;
> + } else if (src_format == BUF_FMT_YUV422) {
> + src_c_xres >>= 1;
> + }
> +
> + if (dst_format == BUF_FMT_YUV422)
> + dst_c_xres >>= 1;
> +
> + l_vinc = ((src_yres << 13) + (dst_yres >> 1)) / dst_yres;
> + c_vinc = ((src_c_yres << 13) + (dst_c_yres >> 1)) / dst_c_yres;
> + l_hinc = ((src_xres << 13) + (dst_xres >> 1)) / dst_xres;
> + c_hinc = ((src_c_xres << 13) + (dst_c_xres >> 1)) / dst_c_xres;
> +
> + /* save chroma start phase */
> + ch->c_vstart = c_vstart;
> + ch->c_hstart = c_hstart;
> +
> + dcss_scaler_write(ch, 0, DCSS_SCALER_V_LUM_START);
> + dcss_scaler_write(ch, l_vinc, DCSS_SCALER_V_LUM_INC);
> +
> + dcss_scaler_write(ch, 0, DCSS_SCALER_H_LUM_START);
> + dcss_scaler_write(ch, l_hinc, DCSS_SCALER_H_LUM_INC);
> +
> + dcss_scaler_write(ch, c_vstart, DCSS_SCALER_V_CHR_START);
> + dcss_scaler_write(ch, c_vinc, DCSS_SCALER_V_CHR_INC);
> +
> + dcss_scaler_write(ch, c_hstart, DCSS_SCALER_H_CHR_START);
> + dcss_scaler_write(ch, c_hinc, DCSS_SCALER_H_CHR_INC);
> +}
> +
> +int dcss_scaler_get_min_max_ratios(struct dcss_scaler *scl, int ch_num,
> + int *min, int *max)
> +{
> + *min = upscale_fp(dcss_scaler_factors[ch_num].upscale, 16);
> + *max = downscale_fp(dcss_scaler_factors[ch_num].downscale, 16);
> +
> + return 0;
> +}
> +
> +static void dcss_scaler_program_5_coef_set(struct dcss_scaler_ch *ch,
> + int base_addr,
> + int coef[][PSC_NUM_TAPS])
> +{
> + int i, phase;
> +
> + for (i = 0; i < PSC_STORED_PHASES; i++) {
> + dcss_scaler_write(ch, ((coef[i][1] & 0xfff) << 16 |
> + (coef[i][2] & 0xfff) << 4 |
> + (coef[i][3] & 0xf00) >> 8),
> + base_addr + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[i][3] & 0x0ff) << 20 |
> + (coef[i][4] & 0xfff) << 8 |
> + (coef[i][5] & 0xff0) >> 4),
> + base_addr + 0x40 + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[i][5] & 0x00f) << 24),
> + base_addr + 0x80 + i * sizeof(u32));
> + }
> +
> + /* reverse both phase and tap orderings */
> + for (phase = (PSC_NUM_PHASES >> 1) - 1;
> + i < PSC_NUM_PHASES; i++, phase--) {
> + dcss_scaler_write(ch, ((coef[phase][5] & 0xfff) << 16 |
> + (coef[phase][4] & 0xfff) << 4 |
> + (coef[phase][3] & 0xf00) >> 8),
> + base_addr + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[phase][3] & 0x0ff) << 20 |
> + (coef[phase][2] & 0xfff) << 8 |
> + (coef[phase][1] & 0xff0) >> 4),
> + base_addr + 0x40 + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[phase][1] & 0x00f) << 24),
> + base_addr + 0x80 + i * sizeof(u32));
> + }
> +}
> +
> +static void dcss_scaler_program_7_coef_set(struct dcss_scaler_ch *ch,
> + int base_addr,
> + int coef[][PSC_NUM_TAPS])
> +{
> + int i, phase;
> +
> + for (i = 0; i < PSC_STORED_PHASES; i++) {
> + dcss_scaler_write(ch, ((coef[i][0] & 0xfff) << 16 |
> + (coef[i][1] & 0xfff) << 4 |
> + (coef[i][2] & 0xf00) >> 8),
> + base_addr + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[i][2] & 0x0ff) << 20 |
> + (coef[i][3] & 0xfff) << 8 |
> + (coef[i][4] & 0xff0) >> 4),
> + base_addr + 0x40 + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[i][4] & 0x00f) << 24 |
> + (coef[i][5] & 0xfff) << 12 |
> + (coef[i][6] & 0xfff)),
> + base_addr + 0x80 + i * sizeof(u32));
> + }
> +
> + /* reverse both phase and tap orderings */
> + for (phase = (PSC_NUM_PHASES >> 1) - 1;
> + i < PSC_NUM_PHASES; i++, phase--) {
> + dcss_scaler_write(ch, ((coef[phase][6] & 0xfff) << 16 |
> + (coef[phase][5] & 0xfff) << 4 |
> + (coef[phase][4] & 0xf00) >> 8),
> + base_addr + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[phase][4] & 0x0ff) << 20 |
> + (coef[phase][3] & 0xfff) << 8 |
> + (coef[phase][2] & 0xff0) >> 4),
> + base_addr + 0x40 + i * sizeof(u32));
> + dcss_scaler_write(ch, ((coef[phase][2] & 0x00f) << 24 |
> + (coef[phase][1] & 0xfff) << 12 |
> + (coef[phase][0] & 0xfff)),
> + base_addr + 0x80 + i * sizeof(u32));
> + }
> +}
> +
> +static void dcss_scaler_yuv_coef_set(struct dcss_scaler_ch *ch,
> + enum buffer_format src_format,
> + enum buffer_format dst_format,
> + bool use_5_taps,
> + int src_xres, int src_yres, int dst_xres,
> + int dst_yres)
> +{
> + int coef[PSC_STORED_PHASES][PSC_NUM_TAPS];
> + bool program_5_taps = use_5_taps ||
> + (dst_format == BUF_FMT_YUV422 &&
> + src_format == BUF_FMT_ARGB8888_YUV444);
> +
> + /* horizontal luma */
> + dcss_scaler_filter_design(src_xres, dst_xres, false,
> + src_xres == dst_xres, coef);
> + dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
> +
> + /* vertical luma */
> + dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
> + src_yres == dst_yres, coef);
> +
> + if (program_5_taps)
> + dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
> + else
> + dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
> +
> + /* adjust chroma resolution */
> + if (src_format != BUF_FMT_ARGB8888_YUV444)
> + src_xres >>= 1;
> + if (src_format == BUF_FMT_YUV420)
> + src_yres >>= 1;
> + if (dst_format != BUF_FMT_ARGB8888_YUV444)
> + dst_xres >>= 1;
> + if (dst_format == BUF_FMT_YUV420) /* should not happen */
> + dst_yres >>= 1;
> +
> + /* horizontal chroma */
> + dcss_scaler_filter_design(src_xres, dst_xres, false,
> + (src_xres == dst_xres) && (ch->c_hstart == 0),
> + coef);
> +
> + dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HCHR, coef);
> +
> + /* vertical chroma */
> + dcss_scaler_filter_design(src_yres, dst_yres, program_5_taps,
> + (src_yres == dst_yres) && (ch->c_vstart == 0),
> + coef);
> + if (program_5_taps)
> + dcss_scaler_program_5_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
> + else
> + dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VCHR, coef);
> +}
> +
> +static void dcss_scaler_rgb_coef_set(struct dcss_scaler_ch *ch,
> + int src_xres, int src_yres, int dst_xres,
> + int dst_yres)
> +{
> + int coef[PSC_STORED_PHASES][PSC_NUM_TAPS];
> +
> + /* horizontal RGB */
> + dcss_scaler_filter_design(src_xres, dst_xres, false,
> + src_xres == dst_xres, coef);
> + dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_HLUM, coef);
> +
> + /* vertical RGB */
> + dcss_scaler_filter_design(src_yres, dst_yres, false,
> + src_yres == dst_yres, coef);
> + dcss_scaler_program_7_coef_set(ch, DCSS_SCALER_COEF_VLUM, coef);
> +}
> +
> +static void dcss_scaler_set_rgb10_order(struct dcss_scaler_ch *ch,
> + const struct drm_format_info *format)
> +{
> + u32 a2r10g10b10_format;
> +
> + if (format->is_yuv)
> + return;
> +
> + ch->sdata_ctrl &= ~A2R10G10B10_FORMAT_MASK;
> +
> + if (format->depth != 30)
> + return;
> +
> + switch (format->format) {
> + case DRM_FORMAT_ARGB2101010:
> + case DRM_FORMAT_XRGB2101010:
> + a2r10g10b10_format = 0;
> + break;
> +
> + case DRM_FORMAT_ABGR2101010:
> + case DRM_FORMAT_XBGR2101010:
> + a2r10g10b10_format = 5;
> + break;
> +
> + case DRM_FORMAT_RGBA1010102:
> + case DRM_FORMAT_RGBX1010102:
> + a2r10g10b10_format = 6;
> + break;
> +
> + case DRM_FORMAT_BGRA1010102:
> + case DRM_FORMAT_BGRX1010102:
> + a2r10g10b10_format = 11;
> + break;
> +
> + default:
> + a2r10g10b10_format = 0;
> + break;
> + }
> +
> + ch->sdata_ctrl |= a2r10g10b10_format << A2R10G10B10_FORMAT_POS;
> +}
> +
> +void dcss_scaler_setup(struct dcss_scaler *scl, int ch_num,
> + const struct drm_format_info *format,
> + int src_xres, int src_yres, int dst_xres, int dst_yres,
> + u32 vrefresh_hz)
> +{
> + struct dcss_scaler_ch *ch = &scl->ch[ch_num];
> + unsigned int pixel_depth = 0;
> + bool rtr_8line_en = false;
> + bool use_5_taps = false;
> + enum buffer_format src_format = BUF_FMT_ARGB8888_YUV444;
> + enum buffer_format dst_format = BUF_FMT_ARGB8888_YUV444;
> + u32 pix_format = format->format;
> +
> + if (format->is_yuv) {
> + dcss_scaler_yuv_enable(ch, true);
> +
> + if (pix_format == DRM_FORMAT_NV12 ||
> + pix_format == DRM_FORMAT_NV21) {
> + rtr_8line_en = true;
> + src_format = BUF_FMT_YUV420;
> + } else if (pix_format == DRM_FORMAT_UYVY ||
> + pix_format == DRM_FORMAT_VYUY ||
> + pix_format == DRM_FORMAT_YUYV ||
> + pix_format == DRM_FORMAT_YVYU) {
> + src_format = BUF_FMT_YUV422;
> + }
> +
> + use_5_taps = !rtr_8line_en;
> + } else {
> + dcss_scaler_yuv_enable(ch, false);
> +
> + pixel_depth = format->depth;
> + }
> +
> + dcss_scaler_fractions_set(ch, src_xres, src_yres, dst_xres,
> + dst_yres, src_format, dst_format,
> + PSC_LOC_HORZ_0_VERT_1_OVER_4);
> +
> + if (format->is_yuv)
> + dcss_scaler_yuv_coef_set(ch, src_format, dst_format,
> + use_5_taps, src_xres, src_yres,
> + dst_xres, dst_yres);
> + else
> + dcss_scaler_rgb_coef_set(ch, src_xres, src_yres,
> + dst_xres, dst_yres);
> +
> + dcss_scaler_rtr_8lines_enable(ch, rtr_8line_en);
> + dcss_scaler_bit_depth_set(ch, pixel_depth);
> + dcss_scaler_set_rgb10_order(ch, format);
> + dcss_scaler_format_set(ch, src_format, dst_format);
> + dcss_scaler_res_set(ch, src_xres, src_yres, dst_xres, dst_yres,
> + pix_format, dst_format);
> +}
> +
> +/* This function will be called from interrupt context. */
> +void dcss_scaler_write_sclctrl(struct dcss_scaler *scl)
> +{
> + int chnum;
> +
> + dcss_ctxld_assert_locked(scl->ctxld);
> +
> + for (chnum = 0; chnum < 3; chnum++) {
> + struct dcss_scaler_ch *ch = &scl->ch[chnum];
> +
> + if (ch->scaler_ctrl_chgd) {
> + dcss_ctxld_write_irqsafe(scl->ctxld, scl->ctx_id,
> + ch->scaler_ctrl,
> + ch->base_ofs +
> + DCSS_SCALER_CTRL);
> + ch->scaler_ctrl_chgd = false;
> + }
> + }
> +}
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-ss.c b/drivers/gpu/drm/imx/dcss/dcss-ss.c
> new file mode 100644
> index 000000000000..8ddf08da911b
> --- /dev/null
> +++ b/drivers/gpu/drm/imx/dcss/dcss-ss.c
> @@ -0,0 +1,180 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/slab.h>
> +
> +#include "dcss-dev.h"
> +
> +#define DCSS_SS_SYS_CTRL 0x00
> +#define RUN_EN BIT(0)
> +#define DCSS_SS_DISPLAY 0x10
> +#define LRC_X_POS 0
> +#define LRC_X_MASK GENMASK(12, 0)
> +#define LRC_Y_POS 16
> +#define LRC_Y_MASK GENMASK(28, 16)
> +#define DCSS_SS_HSYNC 0x20
> +#define DCSS_SS_VSYNC 0x30
> +#define SYNC_START_POS 0
> +#define SYNC_START_MASK GENMASK(12, 0)
> +#define SYNC_END_POS 16
> +#define SYNC_END_MASK GENMASK(28, 16)
> +#define SYNC_POL BIT(31)
> +#define DCSS_SS_DE_ULC 0x40
> +#define ULC_X_POS 0
> +#define ULC_X_MASK GENMASK(12, 0)
> +#define ULC_Y_POS 16
> +#define ULC_Y_MASK GENMASK(28, 16)
> +#define ULC_POL BIT(31)
> +#define DCSS_SS_DE_LRC 0x50
> +#define DCSS_SS_MODE 0x60
> +#define PIPE_MODE_POS 0
> +#define PIPE_MODE_MASK GENMASK(1, 0)
> +#define DCSS_SS_COEFF 0x70
> +#define HORIZ_A_POS 0
> +#define HORIZ_A_MASK GENMASK(3, 0)
> +#define HORIZ_B_POS 4
> +#define HORIZ_B_MASK GENMASK(7, 4)
> +#define HORIZ_C_POS 8
> +#define HORIZ_C_MASK GENMASK(11, 8)
> +#define HORIZ_H_NORM_POS 12
> +#define HORIZ_H_NORM_MASK GENMASK(14, 12)
> +#define VERT_A_POS 16
> +#define VERT_A_MASK GENMASK(19, 16)
> +#define VERT_B_POS 20
> +#define VERT_B_MASK GENMASK(23, 20)
> +#define VERT_C_POS 24
> +#define VERT_C_MASK GENMASK(27, 24)
> +#define VERT_H_NORM_POS 28
> +#define VERT_H_NORM_MASK GENMASK(30, 28)
> +#define DCSS_SS_CLIP_CB 0x80
> +#define DCSS_SS_CLIP_CR 0x90
> +#define CLIP_MIN_POS 0
> +#define CLIP_MIN_MASK GENMASK(9, 0)
> +#define CLIP_MAX_POS 0
> +#define CLIP_MAX_MASK GENMASK(23, 16)
> +#define DCSS_SS_INTER_MODE 0xA0
> +#define INT_EN BIT(0)
> +#define VSYNC_SHIFT BIT(1)
> +
> +struct dcss_ss {
> + struct device *dev;
> + void __iomem *base_reg;
> + u32 base_ofs;
> +
> + struct dcss_ctxld *ctxld;
> + u32 ctx_id;
> +
> + bool in_use;
> +};
> +
> +static void dcss_ss_write(struct dcss_ss *ss, u32 val, u32 ofs)
> +{
> + if (!ss->in_use)
> + dcss_writel(val, ss->base_reg + ofs);
> +
> + dcss_ctxld_write(ss->ctxld, ss->ctx_id, val,
> + ss->base_ofs + ofs);
> +}
> +
> +int dcss_ss_init(struct dcss_dev *dcss, unsigned long ss_base)
> +{
> + struct dcss_ss *ss;
> +
> + ss = kzalloc(sizeof(*ss), GFP_KERNEL);
> + if (!ss)
> + return -ENOMEM;
> +
> + dcss->ss = ss;
> + ss->dev = dcss->dev;
> + ss->ctxld = dcss->ctxld;
> +
> + ss->base_reg = ioremap(ss_base, SZ_4K);
> + if (!ss->base_reg) {
> + dev_err(dcss->dev, "ss: unable to remap ss base\n");
> + kfree(ss);
> + return -ENOMEM;
> + }
> +
> + ss->base_ofs = ss_base;
> + ss->ctx_id = CTX_SB_HP;
> +
> + return 0;
> +}
> +
> +void dcss_ss_exit(struct dcss_ss *ss)
> +{
> + /* stop SS */
> + dcss_writel(0, ss->base_reg + DCSS_SS_SYS_CTRL);
> +
> + if (ss->base_reg)
> + iounmap(ss->base_reg);
> +
> + kfree(ss);
> +}
> +
> +void dcss_ss_subsam_set(struct dcss_ss *ss)
> +{
> + dcss_ss_write(ss, 0x41614161, DCSS_SS_COEFF);
> + dcss_ss_write(ss, 0, DCSS_SS_MODE);
> + dcss_ss_write(ss, 0x03ff0000, DCSS_SS_CLIP_CB);
> + dcss_ss_write(ss, 0x03ff0000, DCSS_SS_CLIP_CR);
> +}
> +
> +void dcss_ss_sync_set(struct dcss_ss *ss, struct videomode *vm,
> + bool phsync, bool pvsync)
> +{
> + u16 lrc_x, lrc_y;
> + u16 hsync_start, hsync_end;
> + u16 vsync_start, vsync_end;
> + u16 de_ulc_x, de_ulc_y;
> + u16 de_lrc_x, de_lrc_y;
> +
> + lrc_x = vm->hfront_porch + vm->hback_porch + vm->hsync_len +
> + vm->hactive - 1;
> + lrc_y = vm->vfront_porch + vm->vback_porch + vm->vsync_len +
> + vm->vactive - 1;
> +
> + dcss_ss_write(ss, (lrc_y << LRC_Y_POS) | lrc_x, DCSS_SS_DISPLAY);
> +
> + hsync_start = vm->hfront_porch + vm->hback_porch + vm->hsync_len +
> + vm->hactive - 1;
> + hsync_end = vm->hsync_len - 1;
> +
> + dcss_ss_write(ss, (phsync ? SYNC_POL : 0) |
> + ((u32)hsync_end << SYNC_END_POS) | hsync_start,
> + DCSS_SS_HSYNC);
> +
> + vsync_start = vm->vfront_porch - 1;
> + vsync_end = vm->vfront_porch + vm->vsync_len - 1;
> +
> + dcss_ss_write(ss, (pvsync ? SYNC_POL : 0) |
> + ((u32)vsync_end << SYNC_END_POS) | vsync_start,
> + DCSS_SS_VSYNC);
> +
> + de_ulc_x = vm->hsync_len + vm->hback_porch - 1;
> + de_ulc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch;
> +
> + dcss_ss_write(ss, SYNC_POL | ((u32)de_ulc_y << ULC_Y_POS) | de_ulc_x,
> + DCSS_SS_DE_ULC);
> +
> + de_lrc_x = vm->hsync_len + vm->hback_porch + vm->hactive - 1;
> + de_lrc_y = vm->vsync_len + vm->vfront_porch + vm->vback_porch +
> + vm->vactive - 1;
> +
> + dcss_ss_write(ss, (de_lrc_y << LRC_Y_POS) | de_lrc_x, DCSS_SS_DE_LRC);
> +}
> +
> +void dcss_ss_enable(struct dcss_ss *ss)
> +{
> + dcss_ss_write(ss, RUN_EN, DCSS_SS_SYS_CTRL);
> + ss->in_use = true;
> +}
> +
> +void dcss_ss_shutoff(struct dcss_ss *ss)
> +{
> + dcss_writel(0, ss->base_reg + DCSS_SS_SYS_CTRL);
> + ss->in_use = false;
> +}
> --
> 2.23.0
>