[PATCH v8 2/3] drm: rcar-du: Add RZ/G2L DSI driver

From: Biju Das <biju.das.jz@bp.renesas.com>
To: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Philipp Zabel <p.zabel@pengutronix.de>
Cc: Biju Das <biju.das.jz@bp.renesas.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
	dri-devel@lists.freedesktop.org,
	linux-renesas-soc@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Biju Das <biju.das@bp.renesas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Sam Ravnborg <sam@ravnborg.org>
Subject: [PATCH v8 2/3] drm: rcar-du: Add RZ/G2L DSI driver
Date: Tue, 20 Sep 2022 11:55:00 +0100	[thread overview]
Message-ID: <20220920105501.396999-3-biju.das.jz@bp.renesas.com> (raw)
In-Reply-To: <20220920105501.396999-1-biju.das.jz@bp.renesas.com>

This driver supports the MIPI DSI encoder found in the RZ/G2L
SoC. It currently supports DSI video mode only.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v7->v8:
 * Added Rb tag from Laurent.
 * Added hsfreq_max to struct rzg2l_mipi_dsi_timings.
 * Removed enums rzg2l_mipi_dsi_dphy_timings.
 * Replaced if else with for loop for finding dphy_timings
   based on hsfreq.
 * Removed checking "number of lanes capability" from rzg2l_mipi_dsi_
   startup() and added patch#3 for handling it in probe() and enforcing
   it in rzg2l_mipi_dsi_host_attach().
 * Added Labels with an "err_" prefix.
	out_pm_put->err_pm_put
	out_assert_rst_and_stop_clocks->err_stop
	out_stop_hs_clock->err_stop_clock
	out_pm_disable->err_pm_disable
 * Added error message for lane check in rzg2l_mipi_dsi_host_attach()
 * Replaced dev_warn->dev_err for the format error in rzg2l_mipi_dsi_host
   _attach(). Added missing "\n" and print the format for debugging.
v6->v7:
 * Added rzg2l_mipi_dsi_stop() counterpart of rzg2l_mipi_dsi_startup().
 * Error labels are named according to the cleanup operation they perform.
 * Restored Max lane capability read after dphy timing initialization
   as per the guide lines from SoC design team.
 * Added recommended lut values for the Global Operation Timing
   parameters for MIPI DPHY.
v5->v6:
 * Updated commit description
 * Moved handling of arst and prst from rzg2l_mipi_dsi_startup->runtime
   PM suspend/resume handlers.
 * Max lane capability read at probe(), and enforced in
   rzg2l_mipi_dsi_host_attach()
 * Simplified vich1ppsetr setting.
 * Renamed hsclk_running_mode,hsclk_mode->is_clk_cont.
 * Fixed typo in probe error message(arst->rst).
 * Reordered DRM bridge initaization in probe()
 * Updated typo in e-mail address.
v4->v5:
 * Added Ack from Sam.
 * Added a trivial change, replaced rzg2l_mipi_dsi_parse_dt()
   with drm_of_get_data_lanes_count_ep() in probe.
v3->v4:
 * Updated error handling in rzg2l_mipi_dsi_startup() and rzg2l_mipi_dsi_atomic_enable()
v2->v3:
 * pass rzg2l_mipi_dsi pointer to {Link,Phy} register rd/wr function instead
   of the memory pointer
 * Fixed the comment in rzg2l_mipi_dsi_startup()
 * Removed unnecessary dbg message from rzg2l_mipi_dsi_start_video()
 * DRM bridge parameter initialization moved to probe
 * Replaced dev_dbg->dev_err in rzg2l_mipi_dsi_parse_dt()
 * Inserted the missing blank lane after return in probe()
 * Added missing MODULE_DEVICE_TABLE
 * Added include linux/bits.h in header file
 * Fixed various macros in header file.
 * Reorder the make file for DSI, so that it is no more dependent
   on RZ/G2L DU patch series.
v1->v2:
 * Rework based on dt-binding change (DSI + D-PHY) as single block
 * Replaced link_mmio and phy_mmio with mmio in struct rzg2l_mipi_dsi
 * Replaced rzg2l_mipi_phy_write with rzg2l_mipi_dsi_phy_write
   and rzg2l_mipi_dsi_link_write
 * Replaced rzg2l_mipi_phy_read->rzg2l_mipi_dsi_link_read
RFC->v1:
 * Added "depends on ARCH_RENESAS || COMPILE_TEST" on KCONFIG
   and dropped DRM as it is implied by DRM_BRIDGE
 * Used devm_reset_control_get_exclusive() for reset handle
 * Removed bool hsclkmode from struct rzg2l_mipi_dsi
 * Added error check for pm, using pm_runtime_resume_and_get() instead of
   pm_runtime_get_sync()
 * Added check for unsupported formats in rzg2l_mipi_dsi_host_attach()
 * Avoided read-modify-write stopping hsclock
 * Used devm_platform_ioremap_resource for resource allocation
 * Removed unnecessary assert call from probe and remove.
 * wrap the line after the PTR_ERR() in probe()
 * Updated reset failure messages in probe
 * Fixed the typo arstc->prstc
 * Made hex constants to lower case.
RFC:
 * https://patchwork.kernel.org/project/linux-renesas-soc/patch/20220112174612.10773-23-biju.das.jz@bp.renesas.com/
---
 drivers/gpu/drm/rcar-du/Kconfig               |   8 +
 drivers/gpu/drm/rcar-du/Makefile              |   2 +
 drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c      | 762 ++++++++++++++++++
 drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h | 151 ++++
 4 files changed, 923 insertions(+)
 create mode 100644 drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
 create mode 100644 drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h

diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
index c959e8c6be7d..58ffb8c2443b 100644
--- a/drivers/gpu/drm/rcar-du/Kconfig
+++ b/drivers/gpu/drm/rcar-du/Kconfig
@@ -51,6 +51,14 @@ config DRM_RCAR_MIPI_DSI
 	help
 	  Enable support for the R-Car Display Unit embedded MIPI DSI encoders.
 
+config DRM_RZG2L_MIPI_DSI
+	tristate "RZ/G2L MIPI DSI Encoder Support"
+	depends on DRM_BRIDGE && OF
+	depends on ARCH_RENESAS || COMPILE_TEST
+	select DRM_MIPI_DSI
+	help
+	  Enable support for the RZ/G2L Display Unit embedded MIPI DSI encoders.
+
 config DRM_RCAR_VSP
 	bool "R-Car DU VSP Compositor Support" if ARM
 	default y if ARM64
diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile
index 6f132325c8b7..b8f2c82651d9 100644
--- a/drivers/gpu/drm/rcar-du/Makefile
+++ b/drivers/gpu/drm/rcar-du/Makefile
@@ -14,3 +14,5 @@ obj-$(CONFIG_DRM_RCAR_DU)		+= rcar-du-drm.o
 obj-$(CONFIG_DRM_RCAR_DW_HDMI)		+= rcar_dw_hdmi.o
 obj-$(CONFIG_DRM_RCAR_LVDS)		+= rcar_lvds.o
 obj-$(CONFIG_DRM_RCAR_MIPI_DSI)		+= rcar_mipi_dsi.o
+
+obj-$(CONFIG_DRM_RZG2L_MIPI_DSI)	+= rzg2l_mipi_dsi.o
diff --git a/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
new file mode 100644
index 000000000000..8579208db218
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
@@ -0,0 +1,762 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RZ/G2L MIPI DSI Encoder Driver
+ *
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+#include "rzg2l_mipi_dsi_regs.h"
+
+struct rzg2l_mipi_dsi {
+	struct device *dev;
+	void __iomem *mmio;
+
+	struct reset_control *rstc;
+	struct reset_control *arstc;
+	struct reset_control *prstc;
+
+	struct mipi_dsi_host host;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+
+	struct clk *vclk;
+
+	enum mipi_dsi_pixel_format format;
+	unsigned int num_data_lanes;
+	unsigned int lanes;
+	unsigned long mode_flags;
+};
+
+static inline struct rzg2l_mipi_dsi *
+bridge_to_rzg2l_mipi_dsi(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct rzg2l_mipi_dsi, bridge);
+}
+
+static inline struct rzg2l_mipi_dsi *
+host_to_rzg2l_mipi_dsi(struct mipi_dsi_host *host)
+{
+	return container_of(host, struct rzg2l_mipi_dsi, host);
+}
+
+struct rzg2l_mipi_dsi_timings {
+	unsigned long hsfreq_max;
+	u32 t_init;
+	u32 tclk_prepare;
+	u32 ths_prepare;
+	u32 tclk_zero;
+	u32 tclk_pre;
+	u32 tclk_post;
+	u32 tclk_trail;
+	u32 ths_zero;
+	u32 ths_trail;
+	u32 ths_exit;
+	u32 tlpx;
+};
+
+static const struct rzg2l_mipi_dsi_timings rzg2l_mipi_dsi_global_timings[] = {
+	{
+		.hsfreq_max = 80000,
+		.t_init = 79801,
+		.tclk_prepare = 8,
+		.ths_prepare = 13,
+		.tclk_zero = 33,
+		.tclk_pre = 24,
+		.tclk_post = 94,
+		.tclk_trail = 10,
+		.ths_zero = 23,
+		.ths_trail = 17,
+		.ths_exit = 13,
+		.tlpx = 6,
+	},
+	{
+		.hsfreq_max = 125000,
+		.t_init = 79801,
+		.tclk_prepare = 8,
+		.ths_prepare = 12,
+		.tclk_zero = 33,
+		.tclk_pre = 15,
+		.tclk_post = 94,
+		.tclk_trail = 10,
+		.ths_zero = 23,
+		.ths_trail = 17,
+		.ths_exit = 13,
+		.tlpx = 6,
+	},
+	{
+		.hsfreq_max = 250000,
+		.t_init = 79801,
+		.tclk_prepare = 8,
+		.ths_prepare = 12,
+		.tclk_zero = 33,
+		.tclk_pre = 13,
+		.tclk_post = 94,
+		.tclk_trail = 10,
+		.ths_zero = 23,
+		.ths_trail = 16,
+		.ths_exit = 13,
+		.tlpx = 6,
+	},
+	{
+		.hsfreq_max = 360000,
+		.t_init = 79801,
+		.tclk_prepare = 8,
+		.ths_prepare = 10,
+		.tclk_zero = 33,
+		.tclk_pre = 4,
+		.tclk_post = 35,
+		.tclk_trail = 7,
+		.ths_zero = 16,
+		.ths_trail = 9,
+		.ths_exit = 13,
+		.tlpx = 6,
+	},
+	{
+		.hsfreq_max = 720000,
+		.t_init = 79801,
+		.tclk_prepare = 8,
+		.ths_prepare = 9,
+		.tclk_zero = 33,
+		.tclk_pre = 4,
+		.tclk_post = 35,
+		.tclk_trail = 7,
+		.ths_zero = 16,
+		.ths_trail = 9,
+		.ths_exit = 13,
+		.tlpx = 6,
+	},
+	{
+		.hsfreq_max = 1500000,
+		.t_init = 79801,
+		.tclk_prepare = 8,
+		.ths_prepare = 9,
+		.tclk_zero = 33,
+		.tclk_pre = 4,
+		.tclk_post = 35,
+		.tclk_trail = 7,
+		.ths_zero = 16,
+		.ths_trail = 9,
+		.ths_exit = 13,
+		.tlpx = 6,
+	},
+};
+
+static void rzg2l_mipi_dsi_phy_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
+{
+	iowrite32(data, dsi->mmio + reg);
+}
+
+static void rzg2l_mipi_dsi_link_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
+{
+	iowrite32(data, dsi->mmio + LINK_REG_OFFSET + reg);
+}
+
+static u32 rzg2l_mipi_dsi_link_read(struct rzg2l_mipi_dsi *dsi, u32 reg)
+{
+	return ioread32(dsi->mmio + LINK_REG_OFFSET + reg);
+}
+
+/* -----------------------------------------------------------------------------
+ * Hardware Setup
+ */
+
+static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi,
+				  const struct drm_display_mode *mode)
+{
+	const struct rzg2l_mipi_dsi_timings *dphy_timings;
+	unsigned long hsfreq;
+	unsigned int i, bpp;
+	u32 txsetr;
+	u32 clstptsetr;
+	u32 lptrnstsetr;
+	u32 clkkpt;
+	u32 clkbfht;
+	u32 clkstpt;
+	u32 golpbkt;
+	u32 dphyctrl0;
+	u32 dphytim0;
+	u32 dphytim1;
+	u32 dphytim2;
+	u32 dphytim3;
+	int ret;
+
+	/*
+	 * Relationship between hsclk and vclk must follow
+	 * vclk * bpp = hsclk * 8 * lanes
+	 * where vclk: video clock (Hz)
+	 *       bpp: video pixel bit depth
+	 *       hsclk: DSI HS Byte clock frequency (Hz)
+	 *       lanes: number of data lanes
+	 *
+	 * hsclk(bit) = hsclk(byte) * 8
+	 */
+	bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
+	hsfreq = (mode->clock * bpp * 8) / (8 * dsi->lanes);
+
+	/* All DSI global operation timings are set with recommended setting */
+	for (i = 0; i < ARRAY_SIZE(rzg2l_mipi_dsi_global_timings); ++i) {
+		dphy_timings = &rzg2l_mipi_dsi_global_timings[i];
+		if (hsfreq <= dphy_timings->hsfreq_max)
+			break;
+	}
+
+	ret = pm_runtime_resume_and_get(dsi->dev);
+	if (ret < 0)
+		return ret;
+
+	clk_set_rate(dsi->vclk, mode->clock * 1000);
+
+	/* Initializing DPHY before accessing LINK */
+	dphyctrl0 = DSIDPHYCTRL0_CAL_EN_HSRX_OFS | DSIDPHYCTRL0_CMN_MASTER_EN |
+		    DSIDPHYCTRL0_RE_VDD_DETVCCQLV18 | DSIDPHYCTRL0_EN_BGR;
+
+	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYCTRL0, dphyctrl0);
+	usleep_range(20, 30);
+
+	dphyctrl0 |= DSIDPHYCTRL0_EN_LDO1200;
+	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYCTRL0, dphyctrl0);
+	usleep_range(10, 20);
+
+	dphytim0 = DSIDPHYTIM0_TCLK_MISS(0) |
+		   DSIDPHYTIM0_T_INIT(dphy_timings->t_init);
+	dphytim1 = DSIDPHYTIM1_THS_PREPARE(dphy_timings->ths_prepare) |
+		   DSIDPHYTIM1_TCLK_PREPARE(dphy_timings->tclk_prepare) |
+		   DSIDPHYTIM1_THS_SETTLE(0) |
+		   DSIDPHYTIM1_TCLK_SETTLE(0);
+	dphytim2 = DSIDPHYTIM2_TCLK_TRAIL(dphy_timings->tclk_trail) |
+		   DSIDPHYTIM2_TCLK_POST(dphy_timings->tclk_post) |
+		   DSIDPHYTIM2_TCLK_PRE(dphy_timings->tclk_pre) |
+		   DSIDPHYTIM2_TCLK_ZERO(dphy_timings->tclk_zero);
+	dphytim3 = DSIDPHYTIM3_TLPX(dphy_timings->tlpx) |
+		   DSIDPHYTIM3_THS_EXIT(dphy_timings->ths_exit) |
+		   DSIDPHYTIM3_THS_TRAIL(dphy_timings->ths_trail) |
+		   DSIDPHYTIM3_THS_ZERO(dphy_timings->ths_zero);
+
+	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM0, dphytim0);
+	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM1, dphytim1);
+	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM2, dphytim2);
+	rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM3, dphytim3);
+
+	ret = reset_control_deassert(dsi->rstc);
+	if (ret < 0)
+		goto err_pm_put;
+
+	udelay(1);
+
+	/* Enable Data lanes and Clock lanes */
+	txsetr = TXSETR_DLEN | TXSETR_NUMLANEUSE(dsi->lanes - 1) | TXSETR_CLEN;
+	rzg2l_mipi_dsi_link_write(dsi, TXSETR, txsetr);
+
+	/*
+	 * Global timings characteristic depends on high speed Clock Frequency
+	 * Currently MIPI DSI-IF just supports maximum FHD@60 with:
+	 * - videoclock = 148.5 (MHz)
+	 * - bpp: maximum 24bpp
+	 * - data lanes: maximum 4 lanes
+	 * Therefore maximum hsclk will be 891 Mbps.
+	 */
+	if (hsfreq > 445500) {
+		clkkpt = 12;
+		clkbfht = 15;
+		clkstpt = 48;
+		golpbkt = 75;
+	} else if (hsfreq > 250000) {
+		clkkpt = 7;
+		clkbfht = 8;
+		clkstpt = 27;
+		golpbkt = 40;
+	} else {
+		clkkpt = 8;
+		clkbfht = 6;
+		clkstpt = 24;
+		golpbkt = 29;
+	}
+
+	clstptsetr = CLSTPTSETR_CLKKPT(clkkpt) | CLSTPTSETR_CLKBFHT(clkbfht) |
+		     CLSTPTSETR_CLKSTPT(clkstpt);
+	rzg2l_mipi_dsi_link_write(dsi, CLSTPTSETR, clstptsetr);
+
+	lptrnstsetr = LPTRNSTSETR_GOLPBKT(golpbkt);
+	rzg2l_mipi_dsi_link_write(dsi, LPTRNSTSETR, lptrnstsetr);
+
+	return 0;
+
+err_pm_put:
+	pm_runtime_put(dsi->dev);
+
+	return ret;
+}
+
+static void rzg2l_mipi_dsi_stop(struct rzg2l_mipi_dsi *dsi)
+{
+	reset_control_assert(dsi->rstc);
+	pm_runtime_put(dsi->dev);
+}
+
+static void rzg2l_mipi_dsi_set_display_timing(struct rzg2l_mipi_dsi *dsi,
+					      const struct drm_display_mode *mode)
+{
+	u32 vich1ppsetr;
+	u32 vich1vssetr;
+	u32 vich1vpsetr;
+	u32 vich1hssetr;
+	u32 vich1hpsetr;
+	int dsi_format;
+	u32 delay[2];
+	u8 index;
+
+	/* Configuration for Pixel Packet */
+	dsi_format = mipi_dsi_pixel_format_to_bpp(dsi->format);
+	switch (dsi_format) {
+	case 24:
+		vich1ppsetr = VICH1PPSETR_DT_RGB24;
+		break;
+	case 18:
+		vich1ppsetr = VICH1PPSETR_DT_RGB18;
+		break;
+	}
+
+	if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) &&
+	    !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST))
+		vich1ppsetr |= VICH1PPSETR_TXESYNC_PULSE;
+
+	rzg2l_mipi_dsi_link_write(dsi, VICH1PPSETR, vich1ppsetr);
+
+	/* Configuration for Video Parameters */
+	vich1vssetr = VICH1VSSETR_VACTIVE(mode->vdisplay) |
+		      VICH1VSSETR_VSA(mode->vsync_end - mode->vsync_start);
+	vich1vssetr |= (mode->flags & DRM_MODE_FLAG_PVSYNC) ?
+			VICH1VSSETR_VSPOL_HIGH : VICH1VSSETR_VSPOL_LOW;
+
+	vich1vpsetr = VICH1VPSETR_VFP(mode->vsync_start - mode->vdisplay) |
+		      VICH1VPSETR_VBP(mode->vtotal - mode->vsync_end);
+
+	vich1hssetr = VICH1HSSETR_HACTIVE(mode->hdisplay) |
+		      VICH1HSSETR_HSA(mode->hsync_end - mode->hsync_start);
+	vich1hssetr |= (mode->flags & DRM_MODE_FLAG_PHSYNC) ?
+			VICH1HSSETR_HSPOL_HIGH : VICH1HSSETR_HSPOL_LOW;
+
+	vich1hpsetr = VICH1HPSETR_HFP(mode->hsync_start - mode->hdisplay) |
+		      VICH1HPSETR_HBP(mode->htotal - mode->hsync_end);
+
+	rzg2l_mipi_dsi_link_write(dsi, VICH1VSSETR, vich1vssetr);
+	rzg2l_mipi_dsi_link_write(dsi, VICH1VPSETR, vich1vpsetr);
+	rzg2l_mipi_dsi_link_write(dsi, VICH1HSSETR, vich1hssetr);
+	rzg2l_mipi_dsi_link_write(dsi, VICH1HPSETR, vich1hpsetr);
+
+	/*
+	 * Configuration for Delay Value
+	 * Delay value based on 2 ranges of video clock.
+	 * 74.25MHz is videoclock of HD@60p or FHD@30p
+	 */
+	if (mode->clock > 74250) {
+		delay[0] = 231;
+		delay[1] = 216;
+	} else {
+		delay[0] = 220;
+		delay[1] = 212;
+	}
+
+	if (dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
+		index = 0;
+	else
+		index = 1;
+
+	rzg2l_mipi_dsi_link_write(dsi, VICH1SET1R,
+				  VICH1SET1R_DLY(delay[index]));
+}
+
+static int rzg2l_mipi_dsi_start_hs_clock(struct rzg2l_mipi_dsi *dsi)
+{
+	bool is_clk_cont;
+	u32 hsclksetr;
+	u32 status;
+	int ret;
+
+	is_clk_cont = !(dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS);
+
+	/* Start HS clock */
+	hsclksetr = HSCLKSETR_HSCLKRUN_HS | (is_clk_cont ?
+					     HSCLKSETR_HSCLKMODE_CONT :
+					     HSCLKSETR_HSCLKMODE_NON_CONT);
+	rzg2l_mipi_dsi_link_write(dsi, HSCLKSETR, hsclksetr);
+
+	if (is_clk_cont) {
+		ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
+					status & PLSR_CLLP2HS,
+					2000, 20000, false, dsi, PLSR);
+		if (ret < 0) {
+			dev_err(dsi->dev, "failed to start HS clock\n");
+			return ret;
+		}
+	}
+
+	dev_dbg(dsi->dev, "Start High Speed Clock with %s clock mode",
+		is_clk_cont ? "continuous" : "non-continuous");
+
+	return 0;
+}
+
+static int rzg2l_mipi_dsi_stop_hs_clock(struct rzg2l_mipi_dsi *dsi)
+{
+	bool is_clk_cont;
+	u32 status;
+	int ret;
+
+	is_clk_cont = !(dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS);
+
+	/* Stop HS clock */
+	rzg2l_mipi_dsi_link_write(dsi, HSCLKSETR,
+				  is_clk_cont ? HSCLKSETR_HSCLKMODE_CONT :
+				  HSCLKSETR_HSCLKMODE_NON_CONT);
+
+	if (is_clk_cont) {
+		ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
+					status & PLSR_CLHS2LP,
+					2000, 20000, false, dsi, PLSR);
+		if (ret < 0) {
+			dev_err(dsi->dev, "failed to stop HS clock\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int rzg2l_mipi_dsi_start_video(struct rzg2l_mipi_dsi *dsi)
+{
+	u32 vich1set0r;
+	u32 status;
+	int ret;
+
+	/* Configuration for Blanking sequence and start video input*/
+	vich1set0r = VICH1SET0R_HFPNOLP | VICH1SET0R_HBPNOLP |
+		     VICH1SET0R_HSANOLP | VICH1SET0R_VSTART;
+	rzg2l_mipi_dsi_link_write(dsi, VICH1SET0R, vich1set0r);
+
+	ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
+				status & VICH1SR_VIRDY,
+				2000, 20000, false, dsi, VICH1SR);
+	if (ret < 0)
+		dev_err(dsi->dev, "Failed to start video signal input\n");
+
+	return ret;
+}
+
+static int rzg2l_mipi_dsi_stop_video(struct rzg2l_mipi_dsi *dsi)
+{
+	u32 status;
+	int ret;
+
+	rzg2l_mipi_dsi_link_write(dsi, VICH1SET0R, VICH1SET0R_VSTPAFT);
+	ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
+				(status & VICH1SR_STOP) && (!(status & VICH1SR_RUNNING)),
+				2000, 20000, false, dsi, VICH1SR);
+	if (ret < 0)
+		goto err;
+
+	ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
+				!(status & LINKSR_HSBUSY),
+				2000, 20000, false, dsi, LINKSR);
+	if (ret < 0)
+		goto err;
+
+	return 0;
+
+err:
+	dev_err(dsi->dev, "Failed to stop video signal input\n");
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Bridge
+ */
+
+static int rzg2l_mipi_dsi_attach(struct drm_bridge *bridge,
+				 enum drm_bridge_attach_flags flags)
+{
+	struct rzg2l_mipi_dsi *dsi = bridge_to_rzg2l_mipi_dsi(bridge);
+
+	return drm_bridge_attach(bridge->encoder, dsi->next_bridge, bridge,
+				 flags);
+}
+
+static void rzg2l_mipi_dsi_atomic_enable(struct drm_bridge *bridge,
+					 struct drm_bridge_state *old_bridge_state)
+{
+	struct drm_atomic_state *state = old_bridge_state->base.state;
+	struct rzg2l_mipi_dsi *dsi = bridge_to_rzg2l_mipi_dsi(bridge);
+	const struct drm_display_mode *mode;
+	struct drm_connector *connector;
+	struct drm_crtc *crtc;
+	int ret;
+
+	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+	crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
+	mode = &drm_atomic_get_new_crtc_state(state, crtc)->adjusted_mode;
+
+	ret = rzg2l_mipi_dsi_startup(dsi, mode);
+	if (ret < 0)
+		return;
+
+	rzg2l_mipi_dsi_set_display_timing(dsi, mode);
+
+	ret = rzg2l_mipi_dsi_start_hs_clock(dsi);
+	if (ret < 0)
+		goto err_stop;
+
+	ret = rzg2l_mipi_dsi_start_video(dsi);
+	if (ret < 0)
+		goto err_stop_clock;
+
+	return;
+
+err_stop_clock:
+	rzg2l_mipi_dsi_stop_hs_clock(dsi);
+err_stop:
+	rzg2l_mipi_dsi_stop(dsi);
+}
+
+static void rzg2l_mipi_dsi_atomic_disable(struct drm_bridge *bridge,
+					  struct drm_bridge_state *old_bridge_state)
+{
+	struct rzg2l_mipi_dsi *dsi = bridge_to_rzg2l_mipi_dsi(bridge);
+
+	rzg2l_mipi_dsi_stop_video(dsi);
+	rzg2l_mipi_dsi_stop_hs_clock(dsi);
+	rzg2l_mipi_dsi_stop(dsi);
+}
+
+static enum drm_mode_status
+rzg2l_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge,
+				 const struct drm_display_info *info,
+				 const struct drm_display_mode *mode)
+{
+	if (mode->clock > 148500)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static const struct drm_bridge_funcs rzg2l_mipi_dsi_bridge_ops = {
+	.attach = rzg2l_mipi_dsi_attach,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_enable = rzg2l_mipi_dsi_atomic_enable,
+	.atomic_disable = rzg2l_mipi_dsi_atomic_disable,
+	.mode_valid = rzg2l_mipi_dsi_bridge_mode_valid,
+};
+
+/* -----------------------------------------------------------------------------
+ * Host setting
+ */
+
+static int rzg2l_mipi_dsi_host_attach(struct mipi_dsi_host *host,
+				      struct mipi_dsi_device *device)
+{
+	struct rzg2l_mipi_dsi *dsi = host_to_rzg2l_mipi_dsi(host);
+	int ret;
+
+	if (device->lanes > dsi->num_data_lanes) {
+		dev_err(dsi->dev,
+			"Number of lines of device (%u) exceeds host (%u)\n",
+			device->lanes, dsi->num_data_lanes);
+		return -EINVAL;
+	}
+
+	switch (mipi_dsi_pixel_format_to_bpp(device->format)) {
+	case 24:
+	case 18:
+		break;
+	default:
+		dev_err(dsi->dev, "Unsupported format 0x%04x\n", device->format);
+		return -EINVAL;
+	}
+
+	dsi->lanes = device->lanes;
+	dsi->format = device->format;
+	dsi->mode_flags = device->mode_flags;
+
+	dsi->next_bridge = devm_drm_of_get_bridge(dsi->dev, dsi->dev->of_node,
+						  1, 0);
+	if (IS_ERR(dsi->next_bridge)) {
+		ret = PTR_ERR(dsi->next_bridge);
+		dev_err(dsi->dev, "failed to get next bridge: %d\n", ret);
+		return ret;
+	}
+
+	drm_bridge_add(&dsi->bridge);
+
+	return 0;
+}
+
+static int rzg2l_mipi_dsi_host_detach(struct mipi_dsi_host *host,
+				      struct mipi_dsi_device *device)
+{
+	struct rzg2l_mipi_dsi *dsi = host_to_rzg2l_mipi_dsi(host);
+
+	drm_bridge_remove(&dsi->bridge);
+
+	return 0;
+}
+
+static const struct mipi_dsi_host_ops rzg2l_mipi_dsi_host_ops = {
+	.attach = rzg2l_mipi_dsi_host_attach,
+	.detach = rzg2l_mipi_dsi_host_detach,
+};
+
+/* -----------------------------------------------------------------------------
+ * Power Management
+ */
+
+static int __maybe_unused rzg2l_mipi_pm_runtime_suspend(struct device *dev)
+{
+	struct rzg2l_mipi_dsi *dsi = dev_get_drvdata(dev);
+
+	reset_control_assert(dsi->prstc);
+	reset_control_assert(dsi->arstc);
+
+	return 0;
+}
+
+static int __maybe_unused rzg2l_mipi_pm_runtime_resume(struct device *dev)
+{
+	struct rzg2l_mipi_dsi *dsi = dev_get_drvdata(dev);
+	int ret;
+
+	ret = reset_control_deassert(dsi->arstc);
+	if (ret < 0)
+		return ret;
+
+	ret = reset_control_deassert(dsi->prstc);
+	if (ret < 0)
+		reset_control_assert(dsi->arstc);
+
+	return ret;
+}
+
+static const struct dev_pm_ops rzg2l_mipi_pm_ops = {
+	SET_RUNTIME_PM_OPS(rzg2l_mipi_pm_runtime_suspend, rzg2l_mipi_pm_runtime_resume, NULL)
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe & Remove
+ */
+
+static int rzg2l_mipi_dsi_probe(struct platform_device *pdev)
+{
+	struct rzg2l_mipi_dsi *dsi;
+	int ret;
+
+	dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
+	if (!dsi)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dsi);
+	dsi->dev = &pdev->dev;
+
+	ret = drm_of_get_data_lanes_count_ep(dsi->dev->of_node, 1, 0, 1, 4);
+	if (ret < 0)
+		return dev_err_probe(dsi->dev, ret,
+				     "missing or invalid data-lanes property\n");
+
+	dsi->num_data_lanes = ret;
+
+	dsi->mmio = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dsi->mmio))
+		return PTR_ERR(dsi->mmio);
+
+	dsi->vclk = devm_clk_get(dsi->dev, "vclk");
+	if (IS_ERR(dsi->vclk))
+		return PTR_ERR(dsi->vclk);
+
+	dsi->rstc = devm_reset_control_get_exclusive(dsi->dev, "rst");
+	if (IS_ERR(dsi->rstc))
+		return dev_err_probe(dsi->dev, PTR_ERR(dsi->rstc),
+				     "failed to get rst\n");
+
+	dsi->arstc = devm_reset_control_get_exclusive(dsi->dev, "arst");
+	if (IS_ERR(dsi->arstc))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dsi->arstc),
+				     "failed to get arst\n");
+
+	dsi->prstc = devm_reset_control_get_exclusive(dsi->dev, "prst");
+	if (IS_ERR(dsi->prstc))
+		return dev_err_probe(dsi->dev, PTR_ERR(dsi->prstc),
+				     "failed to get prst\n");
+
+	platform_set_drvdata(pdev, dsi);
+
+	pm_runtime_enable(dsi->dev);
+
+	/* Initialize the DRM bridge. */
+	dsi->bridge.funcs = &rzg2l_mipi_dsi_bridge_ops;
+	dsi->bridge.of_node = dsi->dev->of_node;
+
+	/* Init host device */
+	dsi->host.dev = dsi->dev;
+	dsi->host.ops = &rzg2l_mipi_dsi_host_ops;
+	ret = mipi_dsi_host_register(&dsi->host);
+	if (ret < 0)
+		goto err_pm_disable;
+
+	return 0;
+
+err_pm_disable:
+	pm_runtime_disable(dsi->dev);
+	return ret;
+}
+
+static int rzg2l_mipi_dsi_remove(struct platform_device *pdev)
+{
+	struct rzg2l_mipi_dsi *dsi = platform_get_drvdata(pdev);
+
+	mipi_dsi_host_unregister(&dsi->host);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id rzg2l_mipi_dsi_of_table[] = {
+	{ .compatible = "renesas,rzg2l-mipi-dsi" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, rzg2l_mipi_dsi_of_table);
+
+static struct platform_driver rzg2l_mipi_dsi_platform_driver = {
+	.probe	= rzg2l_mipi_dsi_probe,
+	.remove	= rzg2l_mipi_dsi_remove,
+	.driver	= {
+		.name = "rzg2l-mipi-dsi",
+		.pm = &rzg2l_mipi_pm_ops,
+		.of_match_table = rzg2l_mipi_dsi_of_table,
+	},
+};
+
+module_platform_driver(rzg2l_mipi_dsi_platform_driver);
+
+MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
+MODULE_DESCRIPTION("Renesas RZ/G2L MIPI DSI Encoder Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h
new file mode 100644
index 000000000000..1dbc16ec64a4
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h
@@ -0,0 +1,151 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RZ/G2L MIPI DSI Interface Registers Definitions
+ *
+ * Copyright (C) 2022 Renesas Electronics Corporation
+ */
+
+#ifndef __RZG2L_MIPI_DSI_REGS_H__
+#define __RZG2L_MIPI_DSI_REGS_H__
+
+#include <linux/bits.h>
+
+/* DPHY Registers */
+#define DSIDPHYCTRL0			0x00
+#define DSIDPHYCTRL0_CAL_EN_HSRX_OFS	BIT(16)
+#define DSIDPHYCTRL0_CMN_MASTER_EN	BIT(8)
+#define DSIDPHYCTRL0_RE_VDD_DETVCCQLV18	BIT(2)
+#define DSIDPHYCTRL0_EN_LDO1200		BIT(1)
+#define DSIDPHYCTRL0_EN_BGR		BIT(0)
+
+#define DSIDPHYTIM0			0x04
+#define DSIDPHYTIM0_TCLK_MISS(x)	((x) << 24)
+#define DSIDPHYTIM0_T_INIT(x)		((x) << 0)
+
+#define DSIDPHYTIM1			0x08
+#define DSIDPHYTIM1_THS_PREPARE(x)	((x) << 24)
+#define DSIDPHYTIM1_TCLK_PREPARE(x)	((x) << 16)
+#define DSIDPHYTIM1_THS_SETTLE(x)	((x) << 8)
+#define DSIDPHYTIM1_TCLK_SETTLE(x)	((x) << 0)
+
+#define DSIDPHYTIM2			0x0c
+#define DSIDPHYTIM2_TCLK_TRAIL(x)	((x) << 24)
+#define DSIDPHYTIM2_TCLK_POST(x)	((x) << 16)
+#define DSIDPHYTIM2_TCLK_PRE(x)		((x) << 8)
+#define DSIDPHYTIM2_TCLK_ZERO(x)	((x) << 0)
+
+#define DSIDPHYTIM3			0x10
+#define DSIDPHYTIM3_TLPX(x)		((x) << 24)
+#define DSIDPHYTIM3_THS_EXIT(x)		((x) << 16)
+#define DSIDPHYTIM3_THS_TRAIL(x)	((x) << 8)
+#define DSIDPHYTIM3_THS_ZERO(x)		((x) << 0)
+
+/* --------------------------------------------------------*/
+/* Link Registers */
+#define LINK_REG_OFFSET			0x10000
+
+/* Link Status Register */
+#define LINKSR				0x10
+#define LINKSR_LPBUSY			BIT(13)
+#define LINKSR_HSBUSY			BIT(12)
+#define LINKSR_VICHRUN1			BIT(8)
+#define LINKSR_SQCHRUN1			BIT(4)
+#define LINKSR_SQCHRUN0			BIT(0)
+
+/* Tx Set Register */
+#define TXSETR				0x100
+#define TXSETR_NUMLANECAP		(0x3 << 16)
+#define TXSETR_DLEN			(1 << 9)
+#define TXSETR_CLEN			(1 << 8)
+#define TXSETR_NUMLANEUSE(x)		(((x) & 0x3) << 0)
+
+/* HS Clock Set Register */
+#define HSCLKSETR			0x104
+#define HSCLKSETR_HSCLKMODE_CONT	(1 << 1)
+#define HSCLKSETR_HSCLKMODE_NON_CONT	(0 << 1)
+#define HSCLKSETR_HSCLKRUN_HS		(1 << 0)
+#define HSCLKSETR_HSCLKRUN_LP		(0 << 0)
+
+/* Reset Control Register */
+#define RSTCR				0x110
+#define RSTCR_SWRST			BIT(0)
+#define RSTCR_FCETXSTP			BIT(16)
+
+/* Reset Status Register */
+#define RSTSR				0x114
+#define RSTSR_DL0DIR			(1 << 15)
+#define RSTSR_DLSTPST			(0xf << 8)
+#define RSTSR_SWRSTV1			(1 << 4)
+#define RSTSR_SWRSTIB			(1 << 3)
+#define RSTSR_SWRSTAPB			(1 << 2)
+#define RSTSR_SWRSTLP			(1 << 1)
+#define RSTSR_SWRSTHS			(1 << 0)
+
+/* Clock Lane Stop Time Set Register */
+#define CLSTPTSETR			0x314
+#define CLSTPTSETR_CLKKPT(x)		((x) << 24)
+#define CLSTPTSETR_CLKBFHT(x)		((x) << 16)
+#define CLSTPTSETR_CLKSTPT(x)		((x) << 2)
+
+/* LP Transition Time Set Register */
+#define LPTRNSTSETR			0x318
+#define LPTRNSTSETR_GOLPBKT(x)		((x) << 0)
+
+/* Physical Lane Status Register */
+#define PLSR				0x320
+#define PLSR_CLHS2LP			BIT(27)
+#define PLSR_CLLP2HS			BIT(26)
+
+/* Video-Input Channel 1 Set 0 Register */
+#define VICH1SET0R			0x400
+#define VICH1SET0R_VSEN			BIT(12)
+#define VICH1SET0R_HFPNOLP		BIT(10)
+#define VICH1SET0R_HBPNOLP		BIT(9)
+#define VICH1SET0R_HSANOLP		BIT(8)
+#define VICH1SET0R_VSTPAFT		BIT(1)
+#define VICH1SET0R_VSTART		BIT(0)
+
+/* Video-Input Channel 1 Set 1 Register */
+#define VICH1SET1R			0x404
+#define VICH1SET1R_DLY(x)		(((x) & 0xfff) << 2)
+
+/* Video-Input Channel 1 Status Register */
+#define VICH1SR				0x410
+#define VICH1SR_VIRDY			BIT(3)
+#define VICH1SR_RUNNING			BIT(2)
+#define VICH1SR_STOP			BIT(1)
+#define VICH1SR_START			BIT(0)
+
+/* Video-Input Channel 1 Pixel Packet Set Register */
+#define VICH1PPSETR			0x420
+#define VICH1PPSETR_DT_RGB18		(0x1e << 16)
+#define VICH1PPSETR_DT_RGB18_LS		(0x2e << 16)
+#define VICH1PPSETR_DT_RGB24		(0x3e << 16)
+#define VICH1PPSETR_TXESYNC_PULSE	(1 << 15)
+#define VICH1PPSETR_VC(x)		((x) << 22)
+
+/* Video-Input Channel 1 Vertical Size Set Register */
+#define VICH1VSSETR			0x428
+#define VICH1VSSETR_VACTIVE(x)		(((x) & 0x7fff) << 16)
+#define VICH1VSSETR_VSPOL_LOW		(1 << 15)
+#define VICH1VSSETR_VSPOL_HIGH		(0 << 15)
+#define VICH1VSSETR_VSA(x)		(((x) & 0xfff) << 0)
+
+/* Video-Input Channel 1 Vertical Porch Set Register */
+#define VICH1VPSETR			0x42c
+#define VICH1VPSETR_VFP(x)		(((x) & 0x1fff) << 16)
+#define VICH1VPSETR_VBP(x)		(((x) & 0x1fff) << 0)
+
+/* Video-Input Channel 1 Horizontal Size Set Register */
+#define VICH1HSSETR			0x430
+#define VICH1HSSETR_HACTIVE(x)		(((x) & 0x7fff) << 16)
+#define VICH1HSSETR_HSPOL_LOW		(1 << 15)
+#define VICH1HSSETR_HSPOL_HIGH		(0 << 15)
+#define VICH1HSSETR_HSA(x)		(((x) & 0xfff) << 0)
+
+/* Video-Input Channel 1 Horizontal Porch Set Register */
+#define VICH1HPSETR			0x434
+#define VICH1HPSETR_HFP(x)		(((x) & 0x1fff) << 16)
+#define VICH1HPSETR_HBP(x)		(((x) & 0x1fff) << 0)
+
+#endif /* __RZG2L_MIPI_DSI_REGS_H__ */
-- 
2.25.1

