drm/mediatek: Add DSI sub driver

This patch add a drm encoder/connector driver for the MIPI DSI function
block of the Mediatek display subsystem and a phy driver for the MIPI TX
D-PHY control module.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 913 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
new file mode 100644
index 000000000000..2d808e59fefd
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -0,0 +1,913 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_graph.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <video/videomode.h>
+
+#include "mtk_drm_ddp_comp.h"
+
+#define DSI_VIDEO_FIFO_DEPTH	(1920 / 4)
+#define DSI_HOST_FIFO_DEPTH	64
+
+#define DSI_START		0x00
+
+#define DSI_CON_CTRL		0x10
+#define DSI_RESET			BIT(0)
+#define DSI_EN				BIT(1)
+
+#define DSI_MODE_CTRL		0x14
+#define MODE				(3)
+#define CMD_MODE			0
+#define SYNC_PULSE_MODE			1
+#define SYNC_EVENT_MODE			2
+#define BURST_MODE			3
+#define FRM_MODE			BIT(16)
+#define MIX_MODE			BIT(17)
+
+#define DSI_TXRX_CTRL		0x18
+#define VC_NUM				(2 << 0)
+#define LANE_NUM			(0xf << 2)
+#define DIS_EOT				BIT(6)
+#define NULL_EN				BIT(7)
+#define TE_FREERUN			BIT(8)
+#define EXT_TE_EN			BIT(9)
+#define EXT_TE_EDGE			BIT(10)
+#define MAX_RTN_SIZE			(0xf << 12)
+#define HSTX_CKLP_EN			BIT(16)
+
+#define DSI_PSCTRL		0x1c
+#define DSI_PS_WC			0x3fff
+#define DSI_PS_SEL			(3 << 16)
+#define PACKED_PS_16BIT_RGB565		(0 << 16)
+#define LOOSELY_PS_18BIT_RGB666		(1 << 16)
+#define PACKED_PS_18BIT_RGB666		(2 << 16)
+#define PACKED_PS_24BIT_RGB888		(3 << 16)
+
+#define DSI_VSA_NL		0x20
+#define DSI_VBP_NL		0x24
+#define DSI_VFP_NL		0x28
+#define DSI_VACT_NL		0x2C
+#define DSI_HSA_WC		0x50
+#define DSI_HBP_WC		0x54
+#define DSI_HFP_WC		0x58
+
+#define DSI_HSTX_CKL_WC		0x64
+
+#define DSI_PHY_LCCON		0x104
+#define LC_HS_TX_EN			BIT(0)
+#define LC_ULPM_EN			BIT(1)
+#define LC_WAKEUP_EN			BIT(2)
+
+#define DSI_PHY_LD0CON		0x108
+#define LD0_HS_TX_EN			BIT(0)
+#define LD0_ULPM_EN			BIT(1)
+#define LD0_WAKEUP_EN			BIT(2)
+
+#define DSI_PHY_TIMECON0	0x110
+#define LPX				(0xff << 0)
+#define HS_PRPR				(0xff << 8)
+#define HS_ZERO				(0xff << 16)
+#define HS_TRAIL			(0xff << 24)
+
+#define DSI_PHY_TIMECON1	0x114
+#define TA_GO				(0xff << 0)
+#define TA_SURE				(0xff << 8)
+#define TA_GET				(0xff << 16)
+#define DA_HS_EXIT			(0xff << 24)
+
+#define DSI_PHY_TIMECON2	0x118
+#define CONT_DET			(0xff << 0)
+#define CLK_ZERO			(0xff << 16)
+#define CLK_TRAIL			(0xff << 24)
+
+#define DSI_PHY_TIMECON3	0x11c
+#define CLK_HS_PRPR			(0xff << 0)
+#define CLK_HS_POST			(0xff << 8)
+#define CLK_HS_EXIT			(0xff << 16)
+
+#define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
+
+struct phy;
+
+struct mtk_dsi {
+	struct mtk_ddp_comp ddp_comp;
+	struct device *dev;
+	struct mipi_dsi_host host;
+	struct drm_encoder encoder;
+	struct drm_connector conn;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	struct phy *phy;
+
+	void __iomem *regs;
+
+	struct clk *engine_clk;
+	struct clk *digital_clk;
+	struct clk *hs_clk;
+
+	u32 data_rate;
+
+	unsigned long mode_flags;
+	enum mipi_dsi_pixel_format format;
+	unsigned int lanes;
+	struct videomode vm;
+	int refcount;
+	bool enabled;
+};
+
+static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
+{
+	return container_of(e, struct mtk_dsi, encoder);
+}
+
+static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
+{
+	return container_of(c, struct mtk_dsi, conn);
+}
+
+static inline struct mtk_dsi *host_to_dsi(struct mipi_dsi_host *h)
+{
+	return container_of(h, struct mtk_dsi, host);
+}
+
+static void mtk_dsi_mask(struct mtk_dsi *dsi, u32 offset, u32 mask, u32 data)
+{
+	u32 temp = readl(dsi->regs + offset);
+
+	writel((temp & ~mask) | (data & mask), dsi->regs + offset);
+}
+
+static void dsi_phy_timconfig(struct mtk_dsi *dsi)
+{
+	u32 timcon0, timcon1, timcon2, timcon3;
+	unsigned int ui, cycle_time;
+	unsigned int lpx;
+
+	ui = 1000 / dsi->data_rate + 0x01;
+	cycle_time = 8000 / dsi->data_rate + 0x01;
+	lpx = 5;
+
+	timcon0 = (8 << 24) | (0xa << 16) | (0x6 << 8) | lpx;
+	timcon1 = (7 << 24) | (5 * lpx << 16) | ((3 * lpx) / 2) << 8 |
+		  (4 * lpx);
+	timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) |
+		  (NS_TO_CYCLE(0x150, cycle_time) << 16);
+	timcon3 = (2 * lpx) << 16 | NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8 |
+		   NS_TO_CYCLE(0x40, cycle_time);
+
+	writel(timcon0, dsi->regs + DSI_PHY_TIMECON0);
+	writel(timcon1, dsi->regs + DSI_PHY_TIMECON1);
+	writel(timcon2, dsi->regs + DSI_PHY_TIMECON2);
+	writel(timcon3, dsi->regs + DSI_PHY_TIMECON3);
+}
+
+static void mtk_dsi_enable(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, DSI_EN);
+}
+
+static void mtk_dsi_disable(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, 0);
+}
+
+static void mtk_dsi_reset(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, DSI_RESET);
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);
+}
+
+static int mtk_dsi_poweron(struct mtk_dsi *dsi)
+{
+	struct device *dev = dsi->dev;
+	int ret;
+
+	if (++dsi->refcount != 1)
+		return 0;
+
+	/**
+	 * data_rate = (pixel_clock / 1000) * pixel_dipth * mipi_ratio;
+	 * pixel_clock unit is Khz, data_rata unit is MHz, so need divide 1000.
+	 * mipi_ratio is mipi clk coefficient for balance the pixel clk in mipi.
+	 * we set mipi_ratio is 1.05.
+	 */
+	dsi->data_rate = dsi->vm.pixelclock * 3 * 21 / (1 * 1000 * 10);
+
+	ret = clk_set_rate(dsi->hs_clk, dsi->data_rate * 1000000);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set data rate: %d\n", ret);
+		goto err_refcount;
+	}
+
+	phy_power_on(dsi->phy);
+
+	ret = clk_prepare_enable(dsi->engine_clk);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable engine clock: %d\n", ret);
+		goto err_phy_power_off;
+	}
+
+	ret = clk_prepare_enable(dsi->digital_clk);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable digital clock: %d\n", ret);
+		goto err_disable_engine_clk;
+	}
+
+	mtk_dsi_enable(dsi);
+	mtk_dsi_reset(dsi);
+	dsi_phy_timconfig(dsi);
+
+	return 0;
+
+err_disable_engine_clk:
+	clk_disable_unprepare(dsi->engine_clk);
+err_phy_power_off:
+	phy_power_off(dsi->phy);
+err_refcount:
+	dsi->refcount--;
+	return ret;
+}
+
+static void dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
+	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
+}
+
+static void dsi_clk_ulp_mode_leave(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
+	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, LC_WAKEUP_EN);
+	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, 0);
+}
+
+static void dsi_lane0_ulp_mode_enter(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_HS_TX_EN, 0);
+	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
+}
+
+static void dsi_lane0_ulp_mode_leave(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
+	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, LD0_WAKEUP_EN);
+	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, 0);
+}
+
+static bool dsi_clk_hs_state(struct mtk_dsi *dsi)
+{
+	u32 tmp_reg1;
+
+	tmp_reg1 = readl(dsi->regs + DSI_PHY_LCCON);
+	return ((tmp_reg1 & LC_HS_TX_EN) == 1) ? true : false;
+}
+
+static void dsi_clk_hs_mode(struct mtk_dsi *dsi, bool enter)
+{
+	if (enter && !dsi_clk_hs_state(dsi))
+		mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, LC_HS_TX_EN);
+	else if (!enter && dsi_clk_hs_state(dsi))
+		mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
+}
+
+static void dsi_set_mode(struct mtk_dsi *dsi)
+{
+	u32 vid_mode = CMD_MODE;
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
+		vid_mode = SYNC_PULSE_MODE;
+
+		if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&
+		    !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
+			vid_mode = BURST_MODE;
+	}
+
+	writel(vid_mode, dsi->regs + DSI_MODE_CTRL);
+}
+
+static void dsi_ps_control_vact(struct mtk_dsi *dsi)
+{
+	struct videomode *vm = &dsi->vm;
+	u32 dsi_buf_bpp, ps_wc;
+	u32 ps_bpp_mode;
+
+	if (dsi->format == MIPI_DSI_FMT_RGB565)
+		dsi_buf_bpp = 2;
+	else
+		dsi_buf_bpp = 3;
+
+	ps_wc = vm->hactive * dsi_buf_bpp;
+	ps_bpp_mode = ps_wc;
+
+	switch (dsi->format) {
+	case MIPI_DSI_FMT_RGB888:
+		ps_bpp_mode |= PACKED_PS_24BIT_RGB888;
+		break;
+	case MIPI_DSI_FMT_RGB666:
+		ps_bpp_mode |= PACKED_PS_18BIT_RGB666;
+		break;
+	case MIPI_DSI_FMT_RGB666_PACKED:
+		ps_bpp_mode |= LOOSELY_PS_18BIT_RGB666;
+		break;
+	case MIPI_DSI_FMT_RGB565:
+		ps_bpp_mode |= PACKED_PS_16BIT_RGB565;
+		break;
+	}
+
+	writel(vm->vactive, dsi->regs + DSI_VACT_NL);
+	writel(ps_bpp_mode, dsi->regs + DSI_PSCTRL);
+	writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
+}
+
+static void dsi_rxtx_control(struct mtk_dsi *dsi)
+{
+	u32 tmp_reg;
+
+	switch (dsi->lanes) {
+	case 1:
+		tmp_reg = 1 << 2;
+		break;
+	case 2:
+		tmp_reg = 3 << 2;
+		break;
+	case 3:
+		tmp_reg = 7 << 2;
+		break;
+	case 4:
+		tmp_reg = 0xf << 2;
+		break;
+	default:
+		tmp_reg = 0xf << 2;
+		break;
+	}
+
+	writel(tmp_reg, dsi->regs + DSI_TXRX_CTRL);
+}
+
+static void dsi_ps_control(struct mtk_dsi *dsi)
+{
+	unsigned int dsi_tmp_buf_bpp;
+	u32 tmp_reg;
+
+	switch (dsi->format) {
+	case MIPI_DSI_FMT_RGB888:
+		tmp_reg = PACKED_PS_24BIT_RGB888;
+		dsi_tmp_buf_bpp = 3;
+		break;
+	case MIPI_DSI_FMT_RGB666:
+		tmp_reg = LOOSELY_PS_18BIT_RGB666;
+		dsi_tmp_buf_bpp = 3;
+		break;
+	case MIPI_DSI_FMT_RGB666_PACKED:
+		tmp_reg = PACKED_PS_18BIT_RGB666;
+		dsi_tmp_buf_bpp = 3;
+		break;
+	case MIPI_DSI_FMT_RGB565:
+		tmp_reg = PACKED_PS_16BIT_RGB565;
+		dsi_tmp_buf_bpp = 2;
+		break;
+	default:
+		tmp_reg = PACKED_PS_24BIT_RGB888;
+		dsi_tmp_buf_bpp = 3;
+		break;
+	}
+
+	tmp_reg += dsi->vm.hactive * dsi_tmp_buf_bpp & DSI_PS_WC;
+	writel(tmp_reg, dsi->regs + DSI_PSCTRL);
+}
+
+static void dsi_config_vdo_timing(struct mtk_dsi *dsi)
+{
+	unsigned int horizontal_sync_active_byte;
+	unsigned int horizontal_backporch_byte;
+	unsigned int horizontal_frontporch_byte;
+	unsigned int dsi_tmp_buf_bpp;
+
+	struct videomode *vm = &dsi->vm;
+
+	if (dsi->format == MIPI_DSI_FMT_RGB565)
+		dsi_tmp_buf_bpp = 2;
+	else
+		dsi_tmp_buf_bpp = 3;
+
+	writel(vm->vsync_len, dsi->regs + DSI_VSA_NL);
+	writel(vm->vback_porch, dsi->regs + DSI_VBP_NL);
+	writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
+	writel(vm->vactive, dsi->regs + DSI_VACT_NL);
+
+	horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
+		horizontal_backporch_byte =
+			(vm->hback_porch * dsi_tmp_buf_bpp - 10);
+	else
+		horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
+			dsi_tmp_buf_bpp - 10);
+
+	horizontal_frontporch_byte = (vm->hfront_porch * dsi_tmp_buf_bpp - 12);
+
+	writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
+	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
+	writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
+
+	dsi_ps_control(dsi);
+}
+
+static void mtk_dsi_start(struct mtk_dsi *dsi)
+{
+	writel(0, dsi->regs + DSI_START);
+	writel(1, dsi->regs + DSI_START);
+}
+
+static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
+{
+	if (WARN_ON(dsi->refcount == 0))
+		return;
+
+	if (--dsi->refcount != 0)
+		return;
+
+	dsi_lane0_ulp_mode_enter(dsi);
+	dsi_clk_ulp_mode_enter(dsi);
+
+	mtk_dsi_disable(dsi);
+
+	clk_disable_unprepare(dsi->engine_clk);
+	clk_disable_unprepare(dsi->digital_clk);
+
+	phy_power_off(dsi->phy);
+}
+
+static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
+{
+	int ret;
+
+	if (dsi->enabled)
+		return;
+
+	if (dsi->panel) {
+		if (drm_panel_prepare(dsi->panel)) {
+			DRM_ERROR("failed to setup the panel\n");
+			return;
+		}
+	}
+
+	ret = mtk_dsi_poweron(dsi);
+	if (ret < 0) {
+		DRM_ERROR("failed to power on dsi\n");
+		return;
+	}
+
+	dsi_rxtx_control(dsi);
+
+	dsi_clk_ulp_mode_leave(dsi);
+	dsi_lane0_ulp_mode_leave(dsi);
+	dsi_clk_hs_mode(dsi, 0);
+	dsi_set_mode(dsi);
+
+	dsi_ps_control_vact(dsi);
+	dsi_config_vdo_timing(dsi);
+
+	dsi_set_mode(dsi);
+	dsi_clk_hs_mode(dsi, 1);
+
+	mtk_dsi_start(dsi);
+
+	dsi->enabled = true;
+}
+
+static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
+{
+	if (!dsi->enabled)
+		return;
+
+	if (dsi->panel) {
+		if (drm_panel_disable(dsi->panel)) {
+			DRM_ERROR("failed to disable the panel\n");
+			return;
+		}
+	}
+
+	mtk_dsi_poweroff(dsi);
+
+	dsi->enabled = false;
+}
+
+static void mtk_dsi_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs mtk_dsi_encoder_funcs = {
+	.destroy = mtk_dsi_encoder_destroy,
+};
+
+static bool mtk_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
+				       const struct drm_display_mode *mode,
+				       struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,
+				     struct drm_display_mode *mode,
+				     struct drm_display_mode *adjusted)
+{
+	struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+
+	dsi->vm.pixelclock = adjusted->clock;
+	dsi->vm.hactive = adjusted->hdisplay;
+	dsi->vm.hback_porch = adjusted->htotal - adjusted->hsync_end;
+	dsi->vm.hfront_porch = adjusted->hsync_start - adjusted->hdisplay;
+	dsi->vm.hsync_len = adjusted->hsync_end - adjusted->hsync_start;
+
+	dsi->vm.vactive = adjusted->vdisplay;
+	dsi->vm.vback_porch = adjusted->vtotal - adjusted->vsync_end;
+	dsi->vm.vfront_porch = adjusted->vsync_start - adjusted->vdisplay;
+	dsi->vm.vsync_len = adjusted->vsync_end - adjusted->vsync_start;
+}
+
+static void mtk_dsi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+
+	mtk_output_dsi_disable(dsi);
+}
+
+static void mtk_dsi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+
+	mtk_output_dsi_enable(dsi);
+}
+
+static enum drm_connector_status mtk_dsi_connector_detect(
+	struct drm_connector *connector, bool force)
+{
+	return connector_status_connected;
+}
+
+static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
+{
+	struct mtk_dsi *dsi = connector_to_dsi(connector);
+
+	return drm_panel_get_modes(dsi->panel);
+}
+
+static struct drm_encoder *mtk_dsi_connector_best_encoder(
+		struct drm_connector *connector)
+{
+	struct mtk_dsi *dsi = connector_to_dsi(connector);
+
+	return &dsi->encoder;
+}
+
+static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {
+	.mode_fixup = mtk_dsi_encoder_mode_fixup,
+	.mode_set = mtk_dsi_encoder_mode_set,
+	.disable = mtk_dsi_encoder_disable,
+	.enable = mtk_dsi_encoder_enable,
+};
+
+static const struct drm_connector_funcs mtk_dsi_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.detect = mtk_dsi_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.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_connector_helper_funcs
+	mtk_dsi_connector_helper_funcs = {
+	.get_modes = mtk_dsi_connector_get_modes,
+	.best_encoder = mtk_dsi_connector_best_encoder,
+};
+
+static int mtk_drm_attach_bridge(struct drm_bridge *bridge,
+				 struct drm_encoder *encoder)
+{
+	int ret;
+
+	if (!bridge)
+		return -ENOENT;
+
+	encoder->bridge = bridge;
+	bridge->encoder = encoder;
+	ret = drm_bridge_attach(encoder->dev, bridge);
+	if (ret) {
+		DRM_ERROR("Failed to attach bridge to drm\n");
+		encoder->bridge = NULL;
+		bridge->encoder = NULL;
+	}
+
+	return ret;
+}
+
+static int mtk_dsi_create_connector(struct drm_device *drm, struct mtk_dsi *dsi)
+{
+	int ret;
+
+	ret = drm_connector_init(drm, &dsi->conn, &mtk_dsi_connector_funcs,
+				 DRM_MODE_CONNECTOR_DSI);
+	if (ret) {
+		DRM_ERROR("Failed to connector init to drm\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(&dsi->conn, &mtk_dsi_connector_helper_funcs);
+
+	dsi->conn.dpms = DRM_MODE_DPMS_OFF;
+	drm_mode_connector_attach_encoder(&dsi->conn, &dsi->encoder);
+
+	if (dsi->panel) {
+		ret = drm_panel_attach(dsi->panel, &dsi->conn);
+		if (ret) {
+			DRM_ERROR("Failed to attach panel to drm\n");
+			goto err_connector_cleanup;
+		}
+	}
+
+	return 0;
+
+err_connector_cleanup:
+	drm_connector_cleanup(&dsi->conn);
+	return ret;
+}
+
+static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
+{
+	int ret;
+
+	ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
+			       DRM_MODE_ENCODER_DSI, NULL);
+	if (ret) {
+		DRM_ERROR("Failed to encoder init to drm\n");
+		return ret;
+	}
+	drm_encoder_helper_add(&dsi->encoder, &mtk_dsi_encoder_helper_funcs);
+
+	/*
+	 * Currently display data paths are statically assigned to a crtc each.
+	 * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
+	 */
+	dsi->encoder.possible_crtcs = 1;
+
+	/* If there's a bridge, attach to it and let it create the connector */
+	ret = mtk_drm_attach_bridge(dsi->bridge, &dsi->encoder);
+	if (ret) {
+		/* Otherwise create our own connector and attach to a panel */
+		ret = mtk_dsi_create_connector(drm, dsi);
+		if (ret)
+			goto err_encoder_cleanup;
+	}
+
+	return 0;
+
+err_encoder_cleanup:
+	drm_encoder_cleanup(&dsi->encoder);
+	return ret;
+}
+
+static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
+{
+	drm_encoder_cleanup(&dsi->encoder);
+	/* Skip connector cleanup if creation was delegated to the bridge */
+	if (dsi->conn.dev) {
+		drm_connector_unregister(&dsi->conn);
+		drm_connector_cleanup(&dsi->conn);
+	}
+}
+
+static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)
+{
+	struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
+
+	mtk_dsi_poweron(dsi);
+}
+
+static void mtk_dsi_ddp_stop(struct mtk_ddp_comp *comp)
+{
+	struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
+
+	mtk_dsi_poweroff(dsi);
+}
+
+static const struct mtk_ddp_comp_funcs mtk_dsi_funcs = {
+	.start = mtk_dsi_ddp_start,
+	.stop = mtk_dsi_ddp_stop,
+};
+
+static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
+			       struct mipi_dsi_device *device)
+{
+	struct mtk_dsi *dsi = host_to_dsi(host);
+
+	dsi->lanes = device->lanes;
+	dsi->format = device->format;
+	dsi->mode_flags = device->mode_flags;
+
+	if (dsi->conn.dev)
+		drm_helper_hpd_irq_event(dsi->conn.dev);
+
+	return 0;
+}
+
+static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
+			       struct mipi_dsi_device *device)
+{
+	struct mtk_dsi *dsi = host_to_dsi(host);
+
+	if (dsi->conn.dev)
+		drm_helper_hpd_irq_event(dsi->conn.dev);
+
+	return 0;
+}
+
+static const struct mipi_dsi_host_ops mtk_dsi_ops = {
+	.attach = mtk_dsi_host_attach,
+	.detach = mtk_dsi_host_detach,
+};
+
+static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
+{
+	int ret;
+	struct drm_device *drm = data;
+	struct mtk_dsi *dsi = dev_get_drvdata(dev);
+
+	ret = mtk_ddp_comp_register(drm, &dsi->ddp_comp);
+	if (ret < 0) {
+		dev_err(dev, "Failed to register component %s: %d\n",
+			dev->of_node->full_name, ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_host_register(&dsi->host);
+	if (ret < 0) {
+		dev_err(dev, "failed to register DSI host: %d\n", ret);
+		goto err_ddp_comp_unregister;
+	}
+
+	ret = mtk_dsi_create_conn_enc(drm, dsi);
+	if (ret) {
+		DRM_ERROR("Encoder create failed with %d\n", ret);
+		goto err_unregister;
+	}
+
+	return 0;
+
+err_unregister:
+	mipi_dsi_host_unregister(&dsi->host);
+err_ddp_comp_unregister:
+	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
+	return ret;
+}
+
+static void mtk_dsi_unbind(struct device *dev, struct device *master,
+			   void *data)
+{
+	struct drm_device *drm = data;
+	struct mtk_dsi *dsi = dev_get_drvdata(dev);
+
+	mtk_dsi_destroy_conn_enc(dsi);
+	mipi_dsi_host_unregister(&dsi->host);
+	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
+}
+
+static const struct component_ops mtk_dsi_component_ops = {
+	.bind = mtk_dsi_bind,
+	.unbind = mtk_dsi_unbind,
+};
+
+static int mtk_dsi_probe(struct platform_device *pdev)
+{
+	struct mtk_dsi *dsi;
+	struct device *dev = &pdev->dev;
+	struct device_node *remote_node, *endpoint;
+	struct resource *regs;
+	int comp_id;
+	int ret;
+
+	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+	if (!dsi)
+		return -ENOMEM;
+
+	dsi->host.ops = &mtk_dsi_ops;
+	dsi->host.dev = dev;
+
+	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+	if (endpoint) {
+		remote_node = of_graph_get_remote_port_parent(endpoint);
+		if (!remote_node) {
+			dev_err(dev, "No panel connected\n");
+			return -ENODEV;
+		}
+
+		dsi->bridge = of_drm_find_bridge(remote_node);
+		dsi->panel = of_drm_find_panel(remote_node);
+		of_node_put(remote_node);
+		if (!dsi->bridge && !dsi->panel) {
+			dev_info(dev, "Waiting for bridge or panel driver\n");
+			return -EPROBE_DEFER;
+		}
+	}
+
+	dsi->engine_clk = devm_clk_get(dev, "engine");
+	if (IS_ERR(dsi->engine_clk)) {
+		ret = PTR_ERR(dsi->engine_clk);
+		dev_err(dev, "Failed to get engine clock: %d\n", ret);
+		return ret;
+	}
+
+	dsi->digital_clk = devm_clk_get(dev, "digital");
+	if (IS_ERR(dsi->digital_clk)) {
+		ret = PTR_ERR(dsi->digital_clk);
+		dev_err(dev, "Failed to get digital clock: %d\n", ret);
+		return ret;
+	}
+
+	dsi->hs_clk = devm_clk_get(dev, "hs");
+	if (IS_ERR(dsi->hs_clk)) {
+		ret = PTR_ERR(dsi->hs_clk);
+		dev_err(dev, "Failed to get hs clock: %d\n", ret);
+		return ret;
+	}
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dsi->regs = devm_ioremap_resource(dev, regs);
+	if (IS_ERR(dsi->regs)) {
+		ret = PTR_ERR(dsi->regs);
+		dev_err(dev, "Failed to ioremap memory: %d\n", ret);
+		return ret;
+	}
+
+	dsi->phy = devm_phy_get(dev, "dphy");
+	if (IS_ERR(dsi->phy)) {
+		ret = PTR_ERR(dsi->phy);
+		dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
+		return ret;
+	}
+
+	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
+	if (comp_id < 0) {
+		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
+		return comp_id;
+	}
+
+	ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
+				&mtk_dsi_funcs);
+	if (ret) {
+		dev_err(dev, "Failed to initialize component: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, dsi);
+
+	return component_add(&pdev->dev, &mtk_dsi_component_ops);
+}
+
+static int mtk_dsi_remove(struct platform_device *pdev)
+{
+	struct mtk_dsi *dsi = platform_get_drvdata(pdev);
+
+	mtk_output_dsi_disable(dsi);
+	component_del(&pdev->dev, &mtk_dsi_component_ops);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_dsi_of_match[] = {
+	{ .compatible = "mediatek,mt8173-dsi" },
+	{ },
+};
+
+struct platform_driver mtk_dsi_driver = {
+	.probe = mtk_dsi_probe,
+	.remove = mtk_dsi_remove,
+	.driver = {
+		.name = "mtk-dsi",
+		.of_match_table = mtk_dsi_of_match,
+	},
+};