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Date:   Fri, 1 Mar 2019 09:26:46 +0100
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Paul Cercueil <paul@crapouillou.net>
Cc:     David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] DRM: Add KMS driver for the Ingenic JZ47xx SoCs
Message-ID: <20190301082645.GU2665@phenom.ffwll.local>
Mail-Followup-To: Paul Cercueil <paul@crapouillou.net>,
        David Airlie <airlied@linux.ie>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20190228220756.20262-1-paul@crapouillou.net>
 <20190228220756.20262-4-paul@crapouillou.net>
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On Thu, Feb 28, 2019 at 07:07:56PM -0300, Paul Cercueil wrote:
> Add a KMS driver for the Ingenic JZ47xx family of SoCs.
> This driver is meant to replace the aging jz4740-fb driver.
> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> Tested-by: Artur Rojek <contact@artur-rojek.eu>

Yay, more fbdev drivers moving to atmic!

Going on vacations for a week now, so just a few quick high-level comments
below. Those should make the driver even smaller and cleaner.

> ---
>  drivers/gpu/drm/Kconfig               |   2 +
>  drivers/gpu/drm/Makefile              |   1 +
>  drivers/gpu/drm/ingenic/Kconfig       |  16 +
>  drivers/gpu/drm/ingenic/Makefile      |   1 +
>  drivers/gpu/drm/ingenic/ingenic-drm.c | 896 ++++++++++++++++++++++++++++++++++
>  5 files changed, 916 insertions(+)
>  create mode 100644 drivers/gpu/drm/ingenic/Kconfig
>  create mode 100644 drivers/gpu/drm/ingenic/Makefile
>  create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index bd943a71756c..f1929112e559 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -303,6 +303,8 @@ source "drivers/gpu/drm/sti/Kconfig"
>  
>  source "drivers/gpu/drm/imx/Kconfig"
>  
> +source "drivers/gpu/drm/ingenic/Kconfig"
> +
>  source "drivers/gpu/drm/v3d/Kconfig"
>  
>  source "drivers/gpu/drm/vc4/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 1ac55c65eac0..9666c0767f44 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
>  obj-$(CONFIG_DRM_STM) += stm/
>  obj-$(CONFIG_DRM_STI) += sti/
>  obj-$(CONFIG_DRM_IMX) += imx/
> +obj-y			+= ingenic/
>  obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
>  obj-$(CONFIG_DRM_MESON)	+= meson/
>  obj-y			+= i2c/
> diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
> new file mode 100644
> index 000000000000..d82c3d37ec9c
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/Kconfig
> @@ -0,0 +1,16 @@
> +config DRM_INGENIC
> +	tristate "DRM Support for Ingenic SoCs"
> +	depends on MIPS || COMPILE_TEST
> +	depends on DRM
> +	depends on CMA
> +	depends on OF
> +	select DRM_BRIDGE
> +	select DRM_PANEL_BRIDGE
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_CMA_HELPER
> +	select DRM_GEM_CMA_HELPER
> +	select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
> +	help
> +	  Choose this option for DRM support for the Ingenic SoCs.
> +
> +	  If M is selected the module will be called ingenic-drm.
> diff --git a/drivers/gpu/drm/ingenic/Makefile b/drivers/gpu/drm/ingenic/Makefile
> new file mode 100644
> index 000000000000..11cac42ce0bb
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
> new file mode 100644
> index 000000000000..18120deea96f
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> @@ -0,0 +1,896 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Ingenic JZ47xx KMS driver
> +//
> +// Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
> +
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_irq.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_plane.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include <dt-bindings/display/ingenic,drm.h>
> +
> +#include "../drm_internal.h"
> +
> +#define JZ_REG_LCD_CFG		0x00
> +#define JZ_REG_LCD_VSYNC	0x04
> +#define JZ_REG_LCD_HSYNC	0x08
> +#define JZ_REG_LCD_VAT		0x0C
> +#define JZ_REG_LCD_DAH		0x10
> +#define JZ_REG_LCD_DAV		0x14
> +#define JZ_REG_LCD_PS		0x18
> +#define JZ_REG_LCD_CLS		0x1C
> +#define JZ_REG_LCD_SPL		0x20
> +#define JZ_REG_LCD_REV		0x24
> +#define JZ_REG_LCD_CTRL		0x30
> +#define JZ_REG_LCD_STATE	0x34
> +#define JZ_REG_LCD_IID		0x38
> +#define JZ_REG_LCD_DA0		0x40
> +#define JZ_REG_LCD_SA0		0x44
> +#define JZ_REG_LCD_FID0		0x48
> +#define JZ_REG_LCD_CMD0		0x4C
> +#define JZ_REG_LCD_DA1		0x50
> +#define JZ_REG_LCD_SA1		0x54
> +#define JZ_REG_LCD_FID1		0x58
> +#define JZ_REG_LCD_CMD1		0x5C
> +
> +#define JZ_LCD_CFG_SLCD			BIT(31)
> +#define JZ_LCD_CFG_PS_DISABLE		BIT(23)
> +#define JZ_LCD_CFG_CLS_DISABLE		BIT(22)
> +#define JZ_LCD_CFG_SPL_DISABLE		BIT(21)
> +#define JZ_LCD_CFG_REV_DISABLE		BIT(20)
> +#define JZ_LCD_CFG_HSYNCM		BIT(19)
> +#define JZ_LCD_CFG_PCLKM		BIT(18)
> +#define JZ_LCD_CFG_INV			BIT(17)
> +#define JZ_LCD_CFG_SYNC_DIR		BIT(16)
> +#define JZ_LCD_CFG_PS_POLARITY		BIT(15)
> +#define JZ_LCD_CFG_CLS_POLARITY		BIT(14)
> +#define JZ_LCD_CFG_SPL_POLARITY		BIT(13)
> +#define JZ_LCD_CFG_REV_POLARITY		BIT(12)
> +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW	BIT(11)
> +#define JZ_LCD_CFG_PCLK_FALLING_EDGE	BIT(10)
> +#define JZ_LCD_CFG_DE_ACTIVE_LOW	BIT(9)
> +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW	BIT(8)
> +#define JZ_LCD_CFG_18_BIT		BIT(7)
> +#define JZ_LCD_CFG_PDW			(BIT(5) | BIT(4))
> +#define JZ_LCD_CFG_MODE_MASK		0xf
> +
> +#define JZ_LCD_VSYNC_VPS_OFFSET		16
> +#define JZ_LCD_VSYNC_VPE_OFFSET		0
> +
> +#define JZ_LCD_HSYNC_HPS_OFFSET		16
> +#define JZ_LCD_HSYNC_HPE_OFFSET		0
> +
> +#define JZ_LCD_VAT_HT_OFFSET		16
> +#define JZ_LCD_VAT_VT_OFFSET		0
> +
> +#define JZ_LCD_DAH_HDS_OFFSET		16
> +#define JZ_LCD_DAH_HDE_OFFSET		0
> +
> +#define JZ_LCD_DAV_VDS_OFFSET		16
> +#define JZ_LCD_DAV_VDE_OFFSET		0
> +
> +#define JZ_LCD_CTRL_BURST_4		(0x0 << 28)
> +#define JZ_LCD_CTRL_BURST_8		(0x1 << 28)
> +#define JZ_LCD_CTRL_BURST_16		(0x2 << 28)
> +#define JZ_LCD_CTRL_RGB555		BIT(27)
> +#define JZ_LCD_CTRL_OFUP		BIT(26)
> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16	(0x0 << 24)
> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4	(0x1 << 24)
> +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2	(0x2 << 24)
> +#define JZ_LCD_CTRL_PDD_MASK		(0xff << 16)
> +#define JZ_LCD_CTRL_EOF_IRQ		BIT(13)
> +#define JZ_LCD_CTRL_SOF_IRQ		BIT(12)
> +#define JZ_LCD_CTRL_OFU_IRQ		BIT(11)
> +#define JZ_LCD_CTRL_IFU0_IRQ		BIT(10)
> +#define JZ_LCD_CTRL_IFU1_IRQ		BIT(9)
> +#define JZ_LCD_CTRL_DD_IRQ		BIT(8)
> +#define JZ_LCD_CTRL_QDD_IRQ		BIT(7)
> +#define JZ_LCD_CTRL_REVERSE_ENDIAN	BIT(6)
> +#define JZ_LCD_CTRL_LSB_FISRT		BIT(5)
> +#define JZ_LCD_CTRL_DISABLE		BIT(4)
> +#define JZ_LCD_CTRL_ENABLE		BIT(3)
> +#define JZ_LCD_CTRL_BPP_1		0x0
> +#define JZ_LCD_CTRL_BPP_2		0x1
> +#define JZ_LCD_CTRL_BPP_4		0x2
> +#define JZ_LCD_CTRL_BPP_8		0x3
> +#define JZ_LCD_CTRL_BPP_15_16		0x4
> +#define JZ_LCD_CTRL_BPP_18_24		0x5
> +#define JZ_LCD_CTRL_BPP_MASK		(JZ_LCD_CTRL_RGB555 | (0x7 << 0))
> +
> +#define JZ_LCD_CMD_SOF_IRQ		BIT(31)
> +#define JZ_LCD_CMD_EOF_IRQ		BIT(30)
> +#define JZ_LCD_CMD_ENABLE_PAL		BIT(28)
> +
> +#define JZ_LCD_SYNC_MASK		0x3ff
> +
> +#define JZ_LCD_STATE_EOF_IRQ		BIT(5)
> +#define JZ_LCD_STATE_SOF_IRQ		BIT(4)
> +#define JZ_LCD_STATE_DISABLED		BIT(0)
> +
> +struct ingenic_framedesc {
> +	uint32_t next;
> +	uint32_t addr;
> +	uint32_t id;
> +	uint32_t cmd;
> +} __packed;
> +
> +struct jz_soc_info {
> +	bool needs_dev_clk;
> +};
> +
> +struct ingenic_drm {
> +	struct device *dev;

Embedding is kinda the new thing, since it also prevents people from using
devm_ for this, which is (strictly speaking, not that it matters much) the
wrong lifetime for drm allocations. There's some patches from Noralf that
should land soon to make this a bit more convenient.

> +	void __iomem *base;
> +	struct regmap *map;
> +	struct clk *lcd_clk, *pix_clk;
> +
> +	u32 lcd_mode;
> +
> +	struct ingenic_framedesc *framedesc;
> +	dma_addr_t framedesc_phys;
> +
> +	struct drm_device *drm;
> +	struct drm_plane primary;
> +	struct drm_crtc crtc;
> +	struct drm_connector connector;
> +	struct drm_encoder encoder;

Any reason you didn't opt for the drm_simple_display_pipe helpers? Since
you have just 1:1:1 between crtc/plane/encoder that will allow you to
ditch lots of boilerplate.

https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#simple-kms-helper-reference

> +	struct drm_panel *panel;
> +
> +	struct device_node *panel_node;

There's panel bridge helpers which takes a panel and wraps it into a
drm_bridge (which you can glue into the simple pipe helpers), giving you
the connector for free.

https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#panel-bridge-helper-reference

This should cover all the bigger items, details look already really tidy.

Cheers, Daniel

> +
> +	unsigned short ps_start, ps_end, cls_start,
> +		       cls_end, spl_start, spl_end, rev_start;
> +};
> +
> +static const uint32_t ingenic_drm_primary_formats[] = {
> +	DRM_FORMAT_XRGB1555,
> +	DRM_FORMAT_RGB565,
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case JZ_REG_LCD_IID:
> +	case JZ_REG_LCD_SA0:
> +	case JZ_REG_LCD_FID0:
> +	case JZ_REG_LCD_CMD0:
> +	case JZ_REG_LCD_SA1:
> +	case JZ_REG_LCD_FID1:
> +	case JZ_REG_LCD_CMD1:
> +		return false;
> +	default:
> +		return true;
> +	}
> +}
> +
> +static const struct regmap_config ingenic_drm_regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +
> +	.max_register = JZ_REG_LCD_CMD1,
> +	.writeable_reg = ingenic_drm_writeable_reg,
> +};
> +
> +static inline struct ingenic_drm *drm_crtc_get_priv(struct drm_crtc *crtc)
> +{
> +	return container_of(crtc, struct ingenic_drm, crtc);
> +}
> +
> +static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane)
> +{
> +	return container_of(plane, struct ingenic_drm, primary);
> +}
> +
> +static inline struct ingenic_drm *drm_conn_get_priv(struct drm_connector *conn)
> +{
> +	return container_of(conn, struct ingenic_drm, connector);
> +}
> +
> +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
> +					  struct drm_crtc_state *state)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
> +			   JZ_LCD_CTRL_ENABLE);
> +
> +	drm_panel_enable(priv->panel);
> +
> +	drm_crtc_vblank_on(crtc);
> +}
> +
> +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> +					   struct drm_crtc_state *state)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	unsigned int var;
> +
> +	drm_crtc_vblank_off(crtc);
> +
> +	drm_panel_disable(priv->panel);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
> +
> +	regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
> +				 var & JZ_LCD_STATE_DISABLED,
> +				 1000, 0);
> +}
> +
> +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
> +{
> +	switch (mode) {
> +	case JZ_DRM_LCD_SPECIAL_TFT_1:
> +	case JZ_DRM_LCD_SPECIAL_TFT_2:
> +	case JZ_DRM_LCD_SPECIAL_TFT_3:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
> +{
> +	switch (mode) {
> +	case JZ_DRM_LCD_SINGLE_COLOR_STN:
> +	case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
> +	case JZ_DRM_LCD_DUAL_COLOR_STN:
> +	case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
> +					    struct drm_display_mode *mode)
> +{
> +	unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
> +
> +	vpe = mode->vsync_end - mode->vsync_start;
> +	vds = mode->vtotal - mode->vsync_start;
> +	vde = vds + mode->vdisplay;
> +	vt = vde + mode->vsync_start - mode->vdisplay;
> +
> +	hpe = mode->hsync_end - mode->hsync_start;
> +	hds = mode->htotal - mode->hsync_start;
> +	hde = hds + mode->hdisplay;
> +	ht = hde + mode->hsync_start - mode->hdisplay;
> +
> +	regmap_write(priv->map, JZ_REG_LCD_VSYNC,
> +		     0 << JZ_LCD_VSYNC_VPS_OFFSET |
> +		     vpe << JZ_LCD_VSYNC_VPE_OFFSET);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_HSYNC,
> +		     0 << JZ_LCD_HSYNC_HPS_OFFSET |
> +		     hpe << JZ_LCD_HSYNC_HPE_OFFSET);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_VAT,
> +		     ht << JZ_LCD_VAT_HT_OFFSET |
> +		     vt << JZ_LCD_VAT_VT_OFFSET);
> +
> +	regmap_write(priv->map, JZ_REG_LCD_DAH,
> +		     hds << JZ_LCD_DAH_HDS_OFFSET |
> +		     hde << JZ_LCD_DAH_HDE_OFFSET);
> +	regmap_write(priv->map, JZ_REG_LCD_DAV,
> +		     vds << JZ_LCD_DAV_VDS_OFFSET |
> +		     vde << JZ_LCD_DAV_VDE_OFFSET);
> +
> +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> +		regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
> +		regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
> +		regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
> +		regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
> +	}
> +}
> +
> +static void ingenic_drm_crtc_update_cfg(struct ingenic_drm *priv,
> +					struct drm_display_mode *mode)
> +
> +{
> +	unsigned int cfg = priv->lcd_mode;
> +	u32 bus_flags = priv->connector.display_info.bus_flags;
> +
> +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> +		cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
> +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> +		cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
> +	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
> +		cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
> +	if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> +		cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
> +
> +	if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> +		// TODO: Is that valid for all special modes?
> +		cfg |= JZ_LCD_CFG_REV_POLARITY;
> +	} else {
> +		cfg |= JZ_LCD_CFG_PS_DISABLE
> +		    | JZ_LCD_CFG_CLS_DISABLE
> +		    | JZ_LCD_CFG_SPL_DISABLE
> +		    | JZ_LCD_CFG_REV_DISABLE;
> +	}
> +
> +	regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
> +}
> +
> +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
> +					 unsigned int bpp)
> +{
> +	unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
> +
> +	switch (bpp) {
> +	case 1:
> +		ctrl |= JZ_LCD_CTRL_BPP_1;
> +		break;
> +	case 2:
> +		ctrl |= JZ_LCD_CTRL_BPP_2;
> +		break;
> +	case 4:
> +		ctrl |= JZ_LCD_CTRL_BPP_4;
> +		break;
> +	case 8:
> +		ctrl |= JZ_LCD_CTRL_BPP_8;
> +	break;
> +	case 15:
> +		ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
> +	case 16:
> +		ctrl |= JZ_LCD_CTRL_BPP_15_16;
> +		break;
> +	case 18:
> +	case 24:
> +	case 32:
> +		ctrl |= JZ_LCD_CTRL_BPP_18_24;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
> +			   JZ_LCD_CTRL_BPP_MASK, ctrl);
> +}
> +
> +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
> +					 struct drm_crtc_state *state)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	long rate;
> +
> +	if (!drm_atomic_crtc_needs_modeset(state))
> +		return 0;
> +
> +	rate = clk_round_rate(priv->pix_clk,
> +			      state->adjusted_mode.clock * 1000);
> +	if (rate < 0)
> +		return rate;
> +
> +	return 0;
> +}
> +
> +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> +					  struct drm_crtc_state *oldstate)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +	struct drm_crtc_state *state = crtc->state;
> +	struct drm_pending_vblank_event *event = state->event;
> +	struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
> +	const struct drm_format_info *finfo;
> +	unsigned int width, height;
> +
> +	if (drm_atomic_crtc_needs_modeset(state)) {
> +		finfo = drm_format_info(drm_fb->format->format);
> +		width = state->adjusted_mode.hdisplay;
> +		height = state->adjusted_mode.vdisplay;
> +
> +		ingenic_drm_crtc_update_timings(priv, &state->mode);
> +
> +		ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
> +		ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
> +
> +		clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
> +
> +		regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
> +	}
> +
> +	if (event) {
> +		state->event = NULL;
> +
> +		spin_lock_irq(&crtc->dev->event_lock);
> +		if (drm_crtc_vblank_get(crtc) == 0)
> +			drm_crtc_arm_vblank_event(crtc, event);
> +		else
> +			drm_crtc_send_vblank_event(crtc, event);
> +		spin_unlock_irq(&crtc->dev->event_lock);
> +	}
> +}
> +
> +static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
> +					    struct drm_plane_state *oldstate)
> +{
> +	struct ingenic_drm *priv = drm_plane_get_priv(plane);
> +	struct drm_plane_state *state = plane->state;
> +	const struct drm_format_info *finfo;
> +	unsigned int width, height;
> +
> +	finfo = drm_format_info(state->fb->format->format);
> +	width = state->crtc->state->adjusted_mode.hdisplay;
> +	height = state->crtc->state->adjusted_mode.vdisplay;
> +
> +	priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
> +
> +	priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8) / 4;
> +	priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
> +}
> +
> +static enum drm_connector_status
> +ingenic_drm_conn_detect(struct drm_connector *conn, bool force)
> +{
> +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
> +
> +	if (priv->panel) {
> +		drm_panel_attach(priv->panel, conn);
> +
> +		return connector_status_connected;
> +	}
> +
> +	return connector_status_disconnected;
> +}
> +
> +static void ingenic_drm_conn_destroy(struct drm_connector *conn)
> +{
> +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
> +
> +	if (priv->panel)
> +		drm_panel_detach(priv->panel);
> +
> +	drm_connector_cleanup(conn);
> +}
> +
> +static int ingenic_drm_conn_get_modes(struct drm_connector *conn)
> +{
> +	struct ingenic_drm *priv = drm_conn_get_priv(conn);
> +
> +	if (priv->panel)
> +		return priv->panel->funcs->get_modes(priv->panel);
> +
> +	return 0;
> +}
> +
> +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
> +{
> +	struct drm_device *drm = arg;
> +	struct ingenic_drm *priv = drm->dev_private;
> +	unsigned int state;
> +
> +	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
> +			   JZ_LCD_STATE_EOF_IRQ, 0);
> +
> +	if (state & JZ_LCD_STATE_EOF_IRQ)
> +		drm_crtc_handle_vblank(&priv->crtc);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> +			   JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
> +
> +	return 0;
> +}
> +
> +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
> +{
> +	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> +
> +	regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0);
> +}
> +
> +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
> +
> +static struct drm_driver ingenic_drm_driver_data = {
> +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
> +				| DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
> +	.name			= "ingenic-drm",
> +	.desc			= "DRM module for Ingenic SoCs",
> +	.date			= "20190228",
> +	.major			= 1,
> +	.minor			= 0,
> +	.patchlevel		= 0,
> +
> +	.fops			= &ingenic_drm_fops,
> +
> +	.dumb_create		= drm_gem_cma_dumb_create,
> +	.gem_free_object_unlocked = drm_gem_cma_free_object,
> +	.gem_vm_ops		= &drm_gem_cma_vm_ops,
> +
> +	.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,
> +
> +	.irq_handler		= ingenic_drm_irq_handler,
> +};
> +
> +static const struct drm_plane_funcs ingenic_drm_primary_plane_funcs = {
> +	.update_plane		= drm_atomic_helper_update_plane,
> +	.disable_plane		= drm_atomic_helper_disable_plane,
> +	.reset			= drm_atomic_helper_plane_reset,
> +
> +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> +};
> +
> +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
> +	.reset			= drm_atomic_helper_crtc_reset,
> +	.set_config		= drm_atomic_helper_set_config,
> +	.page_flip		= drm_atomic_helper_page_flip,
> +
> +	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
> +
> +	.enable_vblank		= ingenic_drm_enable_vblank,
> +	.disable_vblank		= ingenic_drm_disable_vblank,
> +
> +	.gamma_set		= drm_atomic_helper_legacy_gamma_set,
> +};
> +
> +static const struct drm_connector_funcs ingenic_drm_conn_funcs = {
> +	.fill_modes		= drm_helper_probe_single_connector_modes,
> +	.detect			= ingenic_drm_conn_detect,
> +	.destroy		= ingenic_drm_conn_destroy,
> +	.reset			= drm_atomic_helper_connector_reset,
> +	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = {
> +	.atomic_update		= ingenic_drm_plane_atomic_update,
> +	.prepare_fb		= drm_gem_fb_prepare_fb,
> +};
> +
> +static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
> +	.atomic_enable		= ingenic_drm_crtc_atomic_enable,
> +	.atomic_disable		= ingenic_drm_crtc_atomic_disable,
> +	.atomic_flush		= ingenic_drm_crtc_atomic_flush,
> +	.atomic_check		= ingenic_drm_crtc_atomic_check,
> +};
> +
> +static const struct drm_connector_helper_funcs ingenic_drm_conn_helper_funcs = {
> +	.get_modes		= ingenic_drm_conn_get_modes,
> +};
> +
> +static const struct drm_mode_config_funcs ingenic_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 const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
> +	.destroy		= drm_encoder_cleanup,
> +};
> +
> +static int ingenic_drm_probe(struct platform_device *pdev)
> +{
> +	const struct jz_soc_info *soc_info;
> +	struct device *dev = &pdev->dev;
> +	struct ingenic_drm *priv;
> +	struct clk *parent_clk;
> +	struct drm_device *drm;
> +	struct resource *mem;
> +	void __iomem *base;
> +	long parent_rate;
> +	int ret, irq;
> +
> +	soc_info = device_get_match_data(dev);
> +	if (!soc_info)
> +		return -EINVAL;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->dev = dev;
> +
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	priv->base = base = devm_ioremap_resource(dev, mem);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "Failed to get platform irq\n");
> +		return -ENOENT;
> +	}
> +
> +	priv->map = devm_regmap_init_mmio(dev, base,
> +					  &ingenic_drm_regmap_config);
> +	if (IS_ERR(priv->map)) {
> +		dev_err(dev, "Failed to create regmap\n");
> +		return PTR_ERR(priv->map);
> +	}
> +
> +	if (soc_info->needs_dev_clk) {
> +		priv->lcd_clk = devm_clk_get(dev, "lcd");
> +		if (IS_ERR(priv->lcd_clk)) {
> +			dev_err(dev, "Failed to get lcd clock\n");
> +			return PTR_ERR(priv->lcd_clk);
> +		}
> +	}
> +
> +	priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
> +	if (IS_ERR(priv->pix_clk)) {
> +		dev_err(dev, "Failed to get pixel clock\n");
> +		return PTR_ERR(priv->pix_clk);
> +	}
> +
> +	priv->panel_node = of_parse_phandle(dev->of_node, "ingenic,panel", 0);
> +	if (!priv->panel_node) {
> +		DRM_INFO("No panel found");
> +	} else {
> +		priv->panel = of_drm_find_panel(priv->panel_node);
> +		of_node_put(priv->panel_node);
> +
> +		if (IS_ERR(priv->panel)) {
> +			if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
> +				return -EPROBE_DEFER;
> +
> +			priv->panel = NULL;
> +		} else {
> +			ret = drm_panel_prepare(priv->panel);
> +			if (ret && ret != -ENOSYS)
> +				return ret;
> +		}
> +	}
> +
> +	if (priv->panel) {
> +		ret = device_property_read_u32(dev, "ingenic,lcd-mode",
> +					       &priv->lcd_mode);
> +		if (ret) {
> +			dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
> +			return ret;
> +		}
> +	}
> +
> +	priv->framedesc = dma_alloc_coherent(dev, sizeof(*priv->framedesc),
> +					     &priv->framedesc_phys, GFP_KERNEL);
> +	if (!priv->framedesc)
> +		return -ENOMEM;
> +
> +	priv->framedesc->next = priv->framedesc_phys;
> +	priv->framedesc->id = 0xdeafbead;
> +
> +	drm = drm_dev_alloc(&ingenic_drm_driver_data, dev);
> +	if (IS_ERR(drm)) {
> +		ret = PTR_ERR(drm);
> +		goto err_free_dma;
> +	}
> +
> +	priv->drm = drm;
> +
> +	drm_mode_config_init(drm);
> +	drm->mode_config.min_width = 0;
> +	drm->mode_config.min_height = 0;
> +	drm->mode_config.max_width = 800;
> +	drm->mode_config.max_height = 600;
> +	drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
> +
> +	drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs);
> +
> +	ret = drm_universal_plane_init(drm, &priv->primary,
> +				       0, &ingenic_drm_primary_plane_funcs,
> +				       ingenic_drm_primary_formats,
> +				       ARRAY_SIZE(ingenic_drm_primary_formats),
> +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
> +	if (ret) {
> +		dev_err(dev, "Failed to register primary plane: %i\n", ret);
> +		goto err_unref_drm;
> +	}
> +
> +	drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
> +
> +	ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
> +					NULL, &ingenic_drm_crtc_funcs, NULL);
> +	if (ret) {
> +		dev_err(dev, "Failed to init CRTC: %i\n", ret);
> +		goto err_cleanup_plane;
> +	}
> +
> +	drm_connector_helper_add(&priv->connector,
> +				 &ingenic_drm_conn_helper_funcs);
> +	ret = drm_connector_init(drm, &priv->connector,
> +				 &ingenic_drm_conn_funcs,
> +				 DRM_MODE_CONNECTOR_Unknown);
> +	if (ret) {
> +		dev_err(dev, "Failed to init connector: %i\n", ret);
> +		goto err_cleanup_crtc;
> +	}
> +
> +	priv->encoder.possible_crtcs = 1;
> +
> +	ret = drm_encoder_init(drm, &priv->encoder, &ingenic_drm_encoder_funcs,
> +			       DRM_MODE_ENCODER_NONE, NULL);
> +	if (ret) {
> +		dev_err(dev, "Failed to init encoder: %i\n", ret);
> +		goto err_cleanup_connector;
> +	}
> +
> +	drm_connector_attach_encoder(&priv->connector, &priv->encoder);
> +
> +	platform_set_drvdata(pdev, drm);
> +	priv->drm = drm;
> +	drm->dev_private = priv;
> +
> +	ret = drm_irq_install(drm, irq);
> +	if (ret) {
> +		dev_err(dev, "Unable to install IRQ handler\n");
> +		goto err_cleanup_encoder;
> +	}
> +
> +	ret = drm_vblank_init(drm, 1);
> +	if (ret) {
> +		dev_err(dev, "Failed calling drm_vblank_init()\n");
> +		goto err_uninstall_irq;
> +	}
> +
> +	drm_mode_config_reset(drm);
> +
> +	ret = clk_prepare_enable(priv->pix_clk);
> +	if (ret) {
> +		dev_err(dev, "Unable to start pixel clock\n");
> +		goto err_cleanup_vblank;
> +	}
> +
> +	if (priv->lcd_clk) {
> +		parent_clk = clk_get_parent(priv->lcd_clk);
> +		parent_rate = clk_get_rate(parent_clk);
> +
> +		/* LCD Device clock must be 3x the pixel clock for STN panels,
> +		 * or 1.5x the pixel clock for TFT panels. To avoid having to
> +		 * check for the LCD device clock everytime we do a mode change,
> +		 * we set the LCD device clock to the highest rate possible.
> +		 */
> +		ret = clk_set_rate(priv->lcd_clk, parent_rate);
> +		if (ret) {
> +			dev_err(dev, "Unable to set LCD clock rate\n");
> +			goto err_pixclk_disable;
> +		}
> +
> +		ret = clk_prepare_enable(priv->lcd_clk);
> +		if (ret) {
> +			dev_err(dev, "Unable to start lcd clock\n");
> +			goto err_pixclk_disable;
> +		}
> +	}
> +
> +	ret = drm_fbdev_generic_setup(drm, 16);
> +	if (ret) {
> +		dev_err(dev, "Failed to init fbdev\n");
> +		goto err_devclk_disable;
> +	}
> +
> +	ret = drm_dev_register(drm, 0);
> +	if (ret) {
> +		dev_err(dev, "Failed to register DRM driver\n");
> +		goto err_cleanup_fbdev;
> +	}
> +
> +	return 0;
> +
> +err_cleanup_fbdev:
> +	drm_mode_config_cleanup(drm);
> +err_devclk_disable:
> +	if (priv->lcd_clk)
> +		clk_disable_unprepare(priv->lcd_clk);
> +err_pixclk_disable:
> +	clk_disable_unprepare(priv->pix_clk);
> +err_cleanup_vblank:
> +	drm_vblank_cleanup(drm);
> +err_uninstall_irq:
> +	drm_irq_uninstall(drm);
> +err_cleanup_encoder:
> +	drm_encoder_cleanup(&priv->encoder);
> +err_cleanup_connector:
> +	drm_connector_cleanup(&priv->connector);
> +err_cleanup_crtc:
> +	drm_crtc_cleanup(&priv->crtc);
> +err_cleanup_plane:
> +	drm_plane_cleanup(&priv->primary);
> +err_unref_drm:
> +	drm_dev_put(drm);
> +err_free_dma:
> +	dma_free_coherent(dev, sizeof(*priv->framedesc),
> +			  priv->framedesc, priv->framedesc_phys);
> +	return ret;
> +}
> +
> +static int ingenic_drm_remove(struct platform_device *pdev)
> +{
> +	struct drm_device *drm = platform_get_drvdata(pdev);
> +	struct ingenic_drm *priv = drm->dev_private;
> +
> +	drm_dev_unregister(drm);
> +	drm_mode_config_cleanup(drm);
> +
> +	if (priv->lcd_clk)
> +		clk_disable_unprepare(priv->lcd_clk);
> +	clk_disable_unprepare(priv->pix_clk);
> +
> +	drm_vblank_cleanup(drm);
> +	drm_irq_uninstall(drm);
> +
> +	drm_encoder_cleanup(&priv->encoder);
> +	drm_connector_cleanup(&priv->connector);
> +	drm_crtc_cleanup(&priv->crtc);
> +	drm_plane_cleanup(&priv->primary);
> +
> +	drm_dev_put(drm);
> +
> +	dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
> +			  priv->framedesc, priv->framedesc_phys);
> +
> +	return 0;
> +}
> +
> +static const struct jz_soc_info jz4740_soc_info = {
> +	.needs_dev_clk = true,
> +};
> +
> +static const struct jz_soc_info jz4725b_soc_info = {
> +	.needs_dev_clk = false,
> +};
> +
> +static const struct of_device_id ingenic_drm_of_match[] = {
> +	{ .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
> +	{ .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info },
> +	{},
> +};
> +
> +static struct platform_driver ingenic_drm_driver = {
> +	.driver = {
> +		.name = "ingenic-drm",
> +		.of_match_table = of_match_ptr(ingenic_drm_of_match),
> +	},
> +	.probe = ingenic_drm_probe,
> +	.remove = ingenic_drm_remove,
> +};
> +module_platform_driver(ingenic_drm_driver);
> +
> +MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
> +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.11.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch