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From: Shengyang Chen <shengyang.chen@starfivetech.com>
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Subject: [PATCH v2 2/2] gpu: drm: bridge: cadence: Add a driver and platform ops for StarFive JH7110 SoC
Date: Tue,  9 Jan 2024 15:25:16 +0800
Message-Id: <20240109072516.24328-3-shengyang.chen@starfivetech.com>
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From: Keith Zhao <keith.zhao@starfivetech.com>

In order to fit CDNS DSI module in StarFive JH7110 SoC,
The mainly modification is followed:

1.Add driver for StarFive JH7110 SoC to drive its CDNS DSI module.
2.Add platform ops in cdns-dsi.c for StarFive JH7110 SoC probing.

Signed-off-by: Keith Zhao <keith.zhao@starfivetech.com>
---
 MAINTAINERS                                   |   8 +
 drivers/gpu/drm/bridge/cadence/Kconfig        |   7 +
 drivers/gpu/drm/bridge/cadence/Makefile       |   1 +
 .../gpu/drm/bridge/cadence/cdns-dsi-core.c    |  29 ++-
 .../gpu/drm/bridge/cadence/cdns-dsi-core.h    |  21 ++
 .../gpu/drm/bridge/cadence/cdns-dsi-jh7110.c  | 193 ++++++++++++++++++
 .../gpu/drm/bridge/cadence/cdns-dsi-jh7110.h  |  16 ++
 7 files changed, 274 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c
 create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h

diff --git a/MAINTAINERS b/MAINTAINERS
index d32920dd943f..a220ea04f5c4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6847,6 +6847,14 @@ F:	Documentation/devicetree/bindings/display/solomon,ssd-common.yaml
 F:	Documentation/devicetree/bindings/display/solomon,ssd13*.yaml
 F:	drivers/gpu/drm/solomon/ssd130x*
 
+DRM DRIVERS FOR STARFIVE
+M:	Keith Zhao <keith.zhao@starfivetech.com>
+M:	Shengyang Chen <shengyang.chen@starfivetech.com>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110*
+
 DRM DRIVER FOR ST-ERICSSON MCDE
 M:	Linus Walleij <linus.walleij@linaro.org>
 S:	Maintained
diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig b/drivers/gpu/drm/bridge/cadence/Kconfig
index cced81633ddc..ad9f572f4720 100644
--- a/drivers/gpu/drm/bridge/cadence/Kconfig
+++ b/drivers/gpu/drm/bridge/cadence/Kconfig
@@ -19,6 +19,13 @@ config DRM_CDNS_DSI_J721E
 	help
 	  Support J721E Cadence DSI wrapper. The wrapper manages
 	  the routing of the DSS DPI signal to the Cadence DSI.
+
+config DRM_CDNS_DSI_JH7110
+	bool "JH7110 SOC Cadence DSI support"
+	default n
+	help
+	  Cadence DPI to DSI bridge which is embedded in the
+	  StarFive JH7110 SoC.
 endif
 
 config DRM_CDNS_MHDP8546
diff --git a/drivers/gpu/drm/bridge/cadence/Makefile b/drivers/gpu/drm/bridge/cadence/Makefile
index c95fd5b81d13..87f603a9f4ad 100644
--- a/drivers/gpu/drm/bridge/cadence/Makefile
+++ b/drivers/gpu/drm/bridge/cadence/Makefile
@@ -2,6 +2,7 @@
 obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
 cdns-dsi-y := cdns-dsi-core.o
 cdns-dsi-$(CONFIG_DRM_CDNS_DSI_J721E) += cdns-dsi-j721e.o
+cdns-dsi-$(CONFIG_DRM_CDNS_DSI_JH7110) += cdns-dsi-jh7110.o
 obj-$(CONFIG_DRM_CDNS_MHDP8546) += cdns-mhdp8546.o
 cdns-mhdp8546-y := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o
 cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) += cdns-mhdp8546-j721e.o
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index 7457d38622b0..a8f976f9eeed 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -27,6 +27,10 @@
 #include "cdns-dsi-j721e.h"
 #endif
 
+#ifdef CONFIG_DRM_CDNS_DSI_JH7110
+#include "cdns-dsi-jh7110.h"
+#endif
+
 #define IP_CONF				0x0
 #define SP_HS_FIFO_DEPTH(x)		(((x) & GENMASK(30, 26)) >> 26)
 #define SP_LP_FIFO_DEPTH(x)		(((x) & GENMASK(25, 21)) >> 21)
@@ -552,6 +556,10 @@ static int cdns_dsi_adjust_phy_config(struct cdns_dsi *dsi,
 	/* data rate was in bytes/sec, convert to bits/sec. */
 	phy_cfg->hs_clk_rate = dlane_bps * 8;
 
+	if (dsi->platform_ops && dsi->platform_ops->update)
+		adj_dsi_htotal = dsi->platform_ops->update(dsi, dsi_cfg, phy_cfg,
+							   dpi_hz, dpi_htotal, dsi_htotal);
+
 	dsi_hfp_ext = adj_dsi_htotal - dsi_htotal;
 	dsi_cfg->hfp += dsi_hfp_ext;
 	dsi_cfg->htotal = dsi_htotal + dsi_hfp_ext;
@@ -683,7 +691,7 @@ static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)
 	pm_runtime_put(dsi->base.dev);
 }
 
-static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
+void cdns_dsi_hs_init(struct cdns_dsi *dsi)
 {
 	struct cdns_dsi_output *output = &dsi->output;
 	u32 status;
@@ -1026,6 +1034,14 @@ static ssize_t cdns_dsi_transfer(struct mipi_dsi_host *host,
 
 	cdns_dsi_init_link(dsi);
 
+	/*
+	 * on JH7110 SoC , when transfer dsi command ,
+	 * cdns_dsi_hs_init is needed.
+	 * or the final ret will be error value.
+	 */
+	if (dsi->platform_ops && dsi->platform_ops->transfer)
+		dsi->platform_ops->transfer(dsi);
+
 	ret = mipi_dsi_create_packet(&packet, msg);
 	if (ret)
 		goto out;
@@ -1142,6 +1158,9 @@ static int __maybe_unused cdns_dsi_resume(struct device *dev)
 	clk_prepare_enable(dsi->dsi_p_clk);
 	clk_prepare_enable(dsi->dsi_sys_clk);
 
+	if (dsi->platform_ops && dsi->platform_ops->resume)
+		dsi->platform_ops->resume(dsi);
+
 	return 0;
 }
 
@@ -1152,6 +1171,10 @@ static int __maybe_unused cdns_dsi_suspend(struct device *dev)
 	clk_disable_unprepare(dsi->dsi_sys_clk);
 	clk_disable_unprepare(dsi->dsi_p_clk);
 	reset_control_assert(dsi->dsi_p_rst);
+
+	if (dsi->platform_ops && dsi->platform_ops->suspend)
+		dsi->platform_ops->suspend(dsi);
+
 	dsi->link_initialized = false;
 	return 0;
 }
@@ -1294,6 +1317,10 @@ static const struct of_device_id cdns_dsi_of_match[] = {
 #ifdef CONFIG_DRM_CDNS_DSI_J721E
 	{ .compatible = "ti,j721e-dsi", .data = &dsi_ti_j721e_ops, },
 #endif
+#ifdef CONFIG_DRM_CDNS_DSI_JH7110
+	{ .compatible = "starfive,jh7110-dsi", .data = &dsi_ti_jh7110_ops, },
+#endif
+
 	{ },
 };
 MODULE_DEVICE_TABLE(of, cdns_dsi_of_match);
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
index ca7ea2da635c..f4491009c977 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
@@ -53,12 +53,22 @@ struct cdns_dsi;
  * @deinit: Called in the CDNS DSI remove
  * @enable: Called at the beginning of CDNS DSI bridge enable
  * @disable: Called at the end of CDNS DSI bridge disable
+ * @resume: Called at the resume of CDNS DSI
+ * @suspend: Called at the suspend of CDNS DSI
+ * @update: Called at the middle of CDNS DSI bridge enable
  */
 struct cdns_dsi_platform_ops {
 	int (*init)(struct cdns_dsi *dsi);
 	void (*deinit)(struct cdns_dsi *dsi);
 	void (*enable)(struct cdns_dsi *dsi);
 	void (*disable)(struct cdns_dsi *dsi);
+	void (*resume)(struct cdns_dsi *dsi);
+	void (*suspend)(struct cdns_dsi *dsi);
+	int (*update)(struct cdns_dsi *dsi, struct cdns_dsi_cfg *dsi_cfg,
+		      struct phy_configure_opts_mipi_dphy *phy_cfg,
+		      unsigned long dpi_hz, unsigned long dpi_htotal,
+		      unsigned long dsi_htotal);
+	void (*transfer)(struct cdns_dsi *dsi);
 };
 
 struct cdns_dsi {
@@ -79,6 +89,17 @@ struct cdns_dsi {
 	bool link_initialized;
 	bool phy_initialized;
 	struct phy *dphy;
+
+#ifdef CONFIG_DRM_CDNS_DSI_JH7110
+	struct clk *apb_clk;
+	struct clk *txesc_clk;
+	struct reset_control *dpi_rst;
+	struct reset_control *apb_rst;
+	struct reset_control *txesc_rst;
+	struct reset_control *txbytehs_rst;
+#endif
 };
 
+void cdns_dsi_hs_init(struct cdns_dsi *dsi);
+
 #endif /* !__CDNS_DSI_H__ */
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c
new file mode 100644
index 000000000000..654d083f49e1
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JH7110 SoC Cadence DSI wrapper
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/reset.h>
+
+#include "cdns-dsi-jh7110.h"
+
+static int cdns_dsi_clock_enable(struct cdns_dsi *dsi, struct device *dev)
+{
+	int ret;
+
+	ret = clk_prepare_enable(dsi->apb_clk);
+	if (ret) {
+		dev_err(dev, "Failed to prepare/enable apb_clk\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(dsi->txesc_clk);
+	if (ret) {
+		dev_err(dev, "Failed to prepare/enable txesc_clk\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static void cdns_dsi_clock_disable(struct cdns_dsi *dsi)
+{
+	clk_disable_unprepare(dsi->apb_clk);
+	clk_disable_unprepare(dsi->txesc_clk);
+}
+
+static int cdns_dsi_resets_deassert(struct cdns_dsi *dsi, struct device *dev)
+{
+	int ret;
+
+	ret = reset_control_deassert(dsi->apb_rst);
+	if (ret < 0) {
+		dev_err(dev, "failed to deassert apb_rst\n");
+		return ret;
+	}
+
+	ret = reset_control_deassert(dsi->txesc_rst);
+	if (ret < 0) {
+		dev_err(dev, "failed to deassert txesc_rst\n");
+		return ret;
+	}
+
+	ret = reset_control_deassert(dsi->dpi_rst);
+	if (ret < 0) {
+		dev_err(dev, "failed to deassert dpi_rst\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static int cdns_dsi_resets_assert(struct cdns_dsi *dsi, struct device *dev)
+{
+	int ret;
+
+	ret = reset_control_assert(dsi->apb_rst);
+	if (ret < 0) {
+		dev_err(dev, "failed to assert apb_rst\n");
+		return ret;
+	}
+
+	ret = reset_control_assert(dsi->txesc_rst);
+	if (ret < 0) {
+		dev_err(dev, "failed to assert txesc_rst\n");
+		return ret;
+	}
+
+	ret = reset_control_assert(dsi->dpi_rst);
+	if (ret < 0) {
+		dev_err(dev, "failed to assert dpi_rst\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static int cdns_dsi_get_clock(struct device *dev, struct cdns_dsi *dsi)
+{
+	dsi->apb_clk = devm_clk_get(dev, "apb");
+	if (IS_ERR(dsi->apb_clk))
+		return PTR_ERR(dsi->apb_clk);
+
+	dsi->txesc_clk = devm_clk_get(dev, "txesc");
+	if (IS_ERR(dsi->txesc_clk))
+		return PTR_ERR(dsi->txesc_clk);
+
+	return 0;
+}
+
+static int cdns_dsi_get_reset(struct device *dev, struct cdns_dsi *dsi)
+{
+	dsi->dpi_rst = devm_reset_control_get(dev, "dpi");
+	if (IS_ERR(dsi->dpi_rst))
+		return PTR_ERR(dsi->dpi_rst);
+
+	dsi->apb_rst = devm_reset_control_get(dev, "apb");
+	if (IS_ERR(dsi->apb_rst))
+		return PTR_ERR(dsi->apb_rst);
+
+	dsi->txesc_rst = devm_reset_control_get(dev, "txesc");
+	if (IS_ERR(dsi->txesc_rst))
+		return PTR_ERR(dsi->txesc_rst);
+
+	dsi->txbytehs_rst = devm_reset_control_get(dev, "txbytehs");
+	if (IS_ERR(dsi->txbytehs_rst))
+		return PTR_ERR(dsi->txbytehs_rst);
+
+	return 0;
+}
+
+static int cdns_dsi_jh7110_init(struct cdns_dsi *dsi)
+{
+	int ret;
+
+	ret = cdns_dsi_get_clock(dsi->base.dev, dsi);
+	if (ret)
+		return ret;
+
+	return cdns_dsi_get_reset(dsi->base.dev, dsi);
+}
+
+static void cdns_dsi_jh7110_resume(struct cdns_dsi *dsi)
+{
+	int ret;
+
+	ret = cdns_dsi_clock_enable(dsi, dsi->base.dev);
+	if (ret) {
+		dev_err(dsi->base.dev, "failed to enable clock\n");
+		return;
+	}
+	ret = cdns_dsi_resets_deassert(dsi, dsi->base.dev);
+	if (ret < 0) {
+		dev_err(dsi->base.dev, "failed to deassert reset\n");
+		return;
+	}
+}
+
+static void cdns_dsi_jh7110_suspend(struct cdns_dsi *dsi)
+{
+	int ret;
+
+	ret = cdns_dsi_resets_assert(dsi, dsi->base.dev);
+	if (ret < 0) {
+		dev_err(dsi->base.dev, "failed to deassert reset\n");
+		return;
+	}
+
+	cdns_dsi_clock_disable(dsi);
+}
+
+static int cdns_dsi_jh7110_update(struct cdns_dsi *dsi, struct cdns_dsi_cfg *dsi_cfg,
+				  struct phy_configure_opts_mipi_dphy *phy_cfg,
+				  unsigned long dpi_hz, unsigned long dpi_htotal,
+				  unsigned long dsi_htotal)
+{
+	unsigned long long dlane_bps;
+	unsigned long adj_dsi_htotal;
+	unsigned int lanes = dsi->output.dev->lanes;
+
+	phy_cfg->hs_clk_rate = phy_cfg->hs_clk_rate - (phy_cfg->hs_clk_rate % 10000000);
+	phy_cfg->hs_clk_rate = phy_cfg->hs_clk_rate + 40000000;
+	dlane_bps = phy_cfg->hs_clk_rate * lanes * dpi_htotal / 8;
+	adj_dsi_htotal = dlane_bps / dpi_hz;
+
+	return adj_dsi_htotal;
+}
+
+static void jh7110_cdns_dsi_hs_init(struct cdns_dsi *dsi)
+{
+	cdns_dsi_hs_init(dsi);
+	reset_control_deassert(dsi->txbytehs_rst);
+}
+
+const struct cdns_dsi_platform_ops dsi_ti_jh7110_ops = {
+	.init = cdns_dsi_jh7110_init,
+	.resume = cdns_dsi_jh7110_resume,
+	.suspend = cdns_dsi_jh7110_suspend,
+	.update = cdns_dsi_jh7110_update,
+	.transfer = jh7110_cdns_dsi_hs_init,
+};
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h
new file mode 100644
index 000000000000..15d6a766b502
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * JH7110 Cadence DSI
+ *
+ * Copyright (C) 2022-2023 StarFive Technology Co., Ltd.
+ * Author: keith.zhao <keith.zhao@starfivetech.com>
+ */
+
+#ifndef __CDNS_DSI_JH7110_H__
+#define __CDNS_DSI_JH7110_H__
+
+#include "cdns-dsi-core.h"
+
+extern const struct cdns_dsi_platform_ops dsi_ti_jh7110_ops;
+
+#endif /* !__CDNS_DSI_JH7110_H__ */
-- 
2.17.1