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From: Philipp Zabel <p.zabel@pengutronix.de>
To: dri-devel@lists.freedesktop.org
Subject: [RFC v4 03/11] drm/mediatek: Add DSI sub driver
Date: Fri, 16 Oct 2015 22:12:05 +0200
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Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org,
	Paul Bolle <pebolle@tiscali.nl>, YT Shen <yt.shen@mediatek.com>,
	Jitao Shi <jitao.shi@mediatek.com>, Jie Qiu <jie.qiu@mediatek.com>,
	Pawel Moll <pawel.moll@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Cawa Cheng <cawa.cheng@mediatek.com>,
	Daniel Stone <daniel@fooishbar.org>,
	CK Hu <ck.hu@mediatek.com>, Rob Herring <robh+dt@kernel.org>,
	linux-mediatek@lists.infradead.org, Daniel Vetter <daniel@ffwll.ch>,
	Kumar Gala <galak@codeaurora.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Philipp Zabel <p.zabel@pengutronix.de>, Dave Airlie <airlied@gmail.com>,
	kernel@pengutronix.de
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From: CK Hu <ck.hu@mediatek.com>

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>
---
Changes since v3:
 - Simplified bind function
 - Removed superfluous module_platform_driver
 - Fixed phy power refcounting (double phy_power_off)
---
 drivers/gpu/drm/mediatek/Makefile      |   4 +-
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |  19 +
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |   2 +
 drivers/gpu/drm/mediatek/mtk_dsi.c     | 787 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_dsi.h     |  54 +++
 drivers/gpu/drm/mediatek/mtk_mipi_tx.c | 375 ++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_mipi_tx.h |  21 +
 7 files changed, 1261 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dsi.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dsi.h
 create mode 100644 drivers/gpu/drm/mediatek/mtk_mipi_tx.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_mipi_tx.h

diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index ba6d3fc..0d4aeeb 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -4,7 +4,9 @@ mediatek-drm-y := mtk_drm_drv.o \
 		  mtk_drm_ddp_comp.o \
 		  mtk_drm_fb.o \
 		  mtk_drm_gem.o \
-		  mtk_drm_plane.o
+		  mtk_drm_plane.o \
+		  mtk_dsi.o \
+		  mtk_mipi_tx.o
 
 obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
 
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index bb03b4a..6a6c792 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -534,8 +534,25 @@ static int __init mtk_drm_init(void)
 		goto drm_err;
 	}
 
+	ret = platform_driver_register(&mtk_dsi_driver);
+	if (ret < 0) {
+		pr_err("Failed to register DSI platform driver: %d\n!", ret);
+		goto disp_ovl_err;
+	}
+
+	ret = platform_driver_register(&mtk_mipi_tx_driver);
+	if (ret < 0) {
+		pr_err("Failed to register MIPI TX platform driver: %d\n!",
+		       ret);
+		goto dsi_err;
+	}
+
 	return 0;
 
+dsi_err:
+	platform_driver_unregister(&mtk_dsi_driver);
+disp_ovl_err:
+	platform_driver_unregister(&mtk_disp_ovl_driver);
 drm_err:
 	platform_driver_unregister(&mtk_drm_platform_driver);
 err:
@@ -544,6 +561,8 @@ err:
 
 static void __exit mtk_drm_exit(void)
 {
+	platform_driver_unregister(&mtk_mipi_tx_driver);
+	platform_driver_unregister(&mtk_dsi_driver);
 	platform_driver_unregister(&mtk_disp_ovl_driver);
 	platform_driver_unregister(&mtk_drm_platform_driver);
 }
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 5e5128e..9c81abe 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -57,5 +57,7 @@ struct mtk_drm_private {
 };
 
 extern struct platform_driver mtk_disp_ovl_driver;
+extern struct platform_driver mtk_dsi_driver;
+extern struct platform_driver mtk_mipi_tx_driver;
 
 #endif /* MTK_DRM_DRV_H */
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
new file mode 100644
index 0000000..fe3c450
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -0,0 +1,787 @@
+/*
+ * 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_dsi.h"
+#include "mtk_mipi_tx.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))
+
+static void mtk_dsi_mask(struct mtk_dsi *dsi, u32 offset, u32 mask, u32 data)
+{
+	u32 temp = readl(dsi->dsi_reg_base + offset);
+
+	writel((temp & ~mask) | (data & mask), dsi->dsi_reg_base + 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->dsi_reg_base + DSI_PHY_TIMECON0);
+	writel(timcon1, dsi->dsi_reg_base + DSI_PHY_TIMECON1);
+	writel(timcon2, dsi->dsi_reg_base + DSI_PHY_TIMECON2);
+	writel(timcon3, dsi->dsi_reg_base + DSI_PHY_TIMECON3);
+}
+
+static void mtk_dsi_clk_enable(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, DSI_EN);
+}
+
+static void mtk_dsi_clk_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)
+{
+	int ret;
+	struct drm_device *dev = dsi->drm_dev;
+
+	/**
+	 * 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);
+
+	mtk_mipi_tx_set_data_rate(dsi->phy, dsi->data_rate);
+	phy_power_on(dsi->phy);
+
+	ret = clk_prepare_enable(dsi->dsi0_engine_clk_cg);
+	if (ret < 0) {
+		dev_err(dev->dev, "can't enable dsi0_engine_clk_cg %d\n", ret);
+		goto err_dsi0_engine_clk_cg;
+	}
+
+	ret = clk_prepare_enable(dsi->dsi0_digital_clk_cg);
+	if (ret < 0) {
+		dev_err(dev->dev, "can't enable dsi0_digital_clk_cg %d\n", ret);
+		goto err_dsi0_digital_clk_cg;
+	}
+
+	mtk_dsi_clk_enable(dsi);
+	mtk_dsi_reset(dsi);
+	dsi_phy_timconfig(dsi);
+
+	return 0;
+
+err_dsi0_digital_clk_cg:
+	clk_disable_unprepare(dsi->dsi0_engine_clk_cg);
+
+err_dsi0_engine_clk_cg:
+	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->dsi_reg_base + 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->dsi_reg_base + 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->dsi_reg_base + DSI_VACT_NL);
+	writel(ps_bpp_mode, dsi->dsi_reg_base + DSI_PSCTRL);
+	writel(ps_wc, dsi->dsi_reg_base + 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->dsi_reg_base + 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->dsi_reg_base + 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->dsi_reg_base + DSI_VSA_NL);
+	writel(vm->vback_porch, dsi->dsi_reg_base + DSI_VBP_NL);
+	writel(vm->vfront_porch, dsi->dsi_reg_base + DSI_VFP_NL);
+	writel(vm->vactive, dsi->dsi_reg_base + 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->dsi_reg_base + DSI_HSA_WC);
+	writel(horizontal_backporch_byte, dsi->dsi_reg_base + DSI_HBP_WC);
+	writel(horizontal_frontporch_byte, dsi->dsi_reg_base + DSI_HFP_WC);
+
+	dsi_ps_control(dsi);
+}
+
+static void mtk_dsi_start(struct mtk_dsi *dsi)
+{
+	writel(0, dsi->dsi_reg_base + DSI_START);
+	writel(1, dsi->dsi_reg_base + DSI_START);
+}
+
+static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
+{
+	mtk_dsi_clk_disable(dsi);
+
+	clk_disable_unprepare(dsi->dsi0_engine_clk_cg);
+	clk_disable_unprepare(dsi->dsi0_digital_clk_cg);
+
+	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;
+		}
+	}
+
+	dsi_lane0_ulp_mode_enter(dsi);
+	dsi_clk_ulp_mode_enter(dsi);
+	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 void mtk_dsi_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+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 = mtk_dsi_connector_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_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_lcm_bridge(struct drm_bridge *bridge,
+				     struct drm_encoder *encoder)
+{
+	int ret;
+
+	encoder->bridge = bridge;
+	bridge->encoder = encoder;
+	ret = drm_bridge_attach(encoder->dev, bridge);
+	if (ret) {
+		DRM_ERROR("Failed to attach bridge to drm\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mtk_dsi_create_conn_enc(struct mtk_dsi *dsi)
+{
+	int ret;
+
+	ret = drm_encoder_init(dsi->drm_dev, &dsi->encoder,
+			       &mtk_dsi_encoder_funcs, DRM_MODE_ENCODER_DSI);
+
+	if (ret) {
+		DRM_ERROR("Failed to encoder init to drm\n");
+		return ret;
+	}
+	drm_encoder_helper_add(&dsi->encoder, &mtk_dsi_encoder_helper_funcs);
+
+	dsi->encoder.possible_crtcs = 1;
+
+	/* Pre-empt DP connector creation if there's a bridge */
+	ret = mtk_drm_attach_lcm_bridge(dsi->bridge, &dsi->encoder);
+	if (!ret)
+		return 0;
+
+	ret = drm_connector_init(dsi->drm_dev, &dsi->conn,
+				 &mtk_dsi_connector_funcs,
+				 DRM_MODE_CONNECTOR_DSI);
+	if (ret) {
+		DRM_ERROR("Failed to connector init to drm\n");
+		goto errconnector;
+	}
+
+	drm_connector_helper_add(&dsi->conn, &mtk_dsi_connector_helper_funcs);
+
+	ret = drm_connector_register(&dsi->conn);
+	if (ret) {
+		DRM_ERROR("Failed to connector register to drm\n");
+		goto errconnectorreg;
+	}
+
+	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 attact panel to drm\n");
+			return ret;
+		}
+	}
+	return 0;
+
+errconnector:
+	drm_encoder_cleanup(&dsi->encoder);
+errconnectorreg:
+	drm_connector_cleanup(&dsi->conn);
+
+	return ret;
+}
+
+static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
+{
+	drm_encoder_cleanup(&dsi->encoder);
+	drm_connector_unregister(&dsi->conn);
+	drm_connector_cleanup(&dsi->conn);
+}
+
+static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
+{
+	int ret;
+	struct mtk_dsi *dsi = dev_get_drvdata(dev);
+
+	dsi->drm_dev = data;
+
+	ret = mtk_dsi_create_conn_enc(dsi);
+	if (ret) {
+		DRM_ERROR("Encoder create failed with %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mtk_dsi_unbind(struct device *dev, struct device *master,
+			   void *data)
+{
+	struct mtk_dsi *dsi;
+
+	dsi = platform_get_drvdata(to_platform_device(dev));
+	mtk_dsi_destroy_conn_enc(dsi);
+
+	dsi->drm_dev = NULL;
+}
+
+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 ret;
+
+	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->lanes = 4;
+
+	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->dsi0_engine_clk_cg = devm_clk_get(dev, "engine");
+	if (IS_ERR(dsi->dsi0_engine_clk_cg)) {
+		ret = PTR_ERR(dsi->dsi0_engine_clk_cg);
+		dev_err(dev, "Failed to get engine clock: %d\n", ret);
+		return ret;
+	}
+
+	dsi->dsi0_digital_clk_cg = devm_clk_get(dev, "digital");
+	if (IS_ERR(dsi->dsi0_digital_clk_cg)) {
+		ret = PTR_ERR(dsi->dsi0_digital_clk_cg);
+		dev_err(dev, "Failed to get digital clock: %d\n", ret);
+		return ret;
+	}
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dsi->dsi_reg_base = devm_ioremap_resource(dev, regs);
+	if (IS_ERR(dsi->dsi_reg_base)) {
+		ret = PTR_ERR(dsi->dsi_reg_base);
+		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;
+	}
+
+	platform_set_drvdata(pdev, dsi);
+
+	ret = component_add(&pdev->dev, &mtk_dsi_component_ops);
+	if (ret) {
+		dev_err(dev, "Failed to add DSI component\n");
+		return -EPROBE_DEFER;
+	}
+
+	return 0;
+}
+
+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;
+}
+
+#ifdef CONFIG_PM
+static int mtk_dsi_suspend(struct device *dev)
+{
+	struct mtk_dsi *dsi;
+
+	dsi = dev_get_drvdata(dev);
+
+	mtk_output_dsi_disable(dsi);
+	DRM_INFO("dsi suspend success!\n");
+
+	return 0;
+}
+
+static int mtk_dsi_resume(struct device *dev)
+{
+	struct mtk_dsi *dsi;
+
+	dsi = dev_get_drvdata(dev);
+
+	mtk_output_dsi_enable(dsi);
+	DRM_INFO("dsi resume success!\n");
+
+	return 0;
+}
+#endif
+SIMPLE_DEV_PM_OPS(mtk_dsi_pm_ops, mtk_dsi_suspend, mtk_dsi_resume);
+
+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,
+		.pm = &mtk_dsi_pm_ops,
+	},
+};
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.h b/drivers/gpu/drm/mediatek/mtk_dsi.h
new file mode 100644
index 0000000..30a146b
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.h
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+#ifndef _MTK_DSI_H_
+#define _MTK_DSI_H_
+
+#include <drm/drm_crtc.h>
+
+struct phy;
+
+struct mtk_dsi {
+	struct drm_device *drm_dev;
+	struct drm_encoder encoder;
+	struct drm_connector conn;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	struct phy *phy;
+
+	void __iomem *dsi_reg_base;
+	void __iomem *dsi_tx_reg_base;
+
+	struct clk *dsi0_engine_clk_cg;
+	struct clk *dsi0_digital_clk_cg;
+
+	u32 data_rate;
+
+	unsigned long mode_flags;
+	enum mipi_dsi_pixel_format format;
+	unsigned int lanes;
+	struct videomode vm;
+	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);
+}
+
+#endif
diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
new file mode 100644
index 0000000..9d975cd
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
@@ -0,0 +1,375 @@
+/*
+ * 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 <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+
+#define MIPITX_DSI_CON		0x00
+#define RG_DSI_LDOCORE_EN		BIT(0)
+#define RG_DSI_CKG_LDOOUT_EN		BIT(1)
+#define RG_DSI_BCLK_SEL			(3 << 2)
+#define RG_DSI_LD_IDX_SEL		(7 << 4)
+#define RG_DSI_PHYCLK_SEL		(2 << 8)
+#define RG_DSI_DSICLK_FREQ_SEL		BIT(10)
+#define RG_DSI_LPTX_CLMP_EN		BIT(11)
+
+#define MIPITX_DSI_CLOCK_LANE	0x04
+#define RG_DSI_LNTC_LDOOUT_EN		BIT(0)
+#define RG_DSI_LNTC_CKLANE_EN		BIT(1)
+#define RG_DSI_LNTC_LPTX_IPLUS1		BIT(2)
+#define RG_DSI_LNTC_LPTX_IPLUS2		BIT(3)
+#define RG_DSI_LNTC_LPTX_IMINUS		BIT(4)
+#define RG_DSI_LNTC_LPCD_IPLUS		BIT(5)
+#define RG_DSI_LNTC_LPCD_IMLUS		BIT(6)
+#define RG_DSI_LNTC_RT_CODE		(0xf << 8)
+
+#define MIPITX_DSI_DATA_LANE0	0x08
+#define RG_DSI_LNT0_LDOOUT_EN		BIT(0)
+#define RG_DSI_LNT0_CKLANE_EN		BIT(1)
+#define RG_DSI_LNT0_LPTX_IPLUS1		BIT(2)
+#define RG_DSI_LNT0_LPTX_IPLUS2		BIT(3)
+#define RG_DSI_LNT0_LPTX_IMINUS		BIT(4)
+#define RG_DSI_LNT0_LPCD_IPLUS		BIT(5)
+#define RG_DSI_LNT0_LPCD_IMINUS		BIT(6)
+#define RG_DSI_LNT0_RT_CODE		(0xf << 8)
+
+#define MIPITX_DSI_DATA_LANE1	0x0c
+#define RG_DSI_LNT1_LDOOUT_EN		BIT(0)
+#define RG_DSI_LNT1_CKLANE_EN		BIT(1)
+#define RG_DSI_LNT1_LPTX_IPLUS1		BIT(2)
+#define RG_DSI_LNT1_LPTX_IPLUS2		BIT(3)
+#define RG_DSI_LNT1_LPTX_IMINUS		BIT(4)
+#define RG_DSI_LNT1_LPCD_IPLUS		BIT(5)
+#define RG_DSI_LNT1_LPCD_IMINUS		BIT(6)
+#define RG_DSI_LNT1_RT_CODE		(0xf << 8)
+
+#define MIPITX_DSI_DATA_LANE2	0x10
+#define RG_DSI_LNT2_LDOOUT_EN		BIT(0)
+#define RG_DSI_LNT2_CKLANE_EN		BIT(1)
+#define RG_DSI_LNT2_LPTX_IPLUS1		BIT(2)
+#define RG_DSI_LNT2_LPTX_IPLUS2		BIT(3)
+#define RG_DSI_LNT2_LPTX_IMINUS		BIT(4)
+#define RG_DSI_LNT2_LPCD_IPLUS		BIT(5)
+#define RG_DSI_LNT2_LPCD_IMINUS		BIT(6)
+#define RG_DSI_LNT2_RT_CODE		(0xf << 8)
+
+#define MIPITX_DSI_DATA_LANE3	0x14
+#define RG_DSI_LNT3_LDOOUT_EN		BIT(0)
+#define RG_DSI_LNT3_CKLANE_EN		BIT(1)
+#define RG_DSI_LNT3_LPTX_IPLUS1		BIT(2)
+#define RG_DSI_LNT3_LPTX_IPLUS2		BIT(3)
+#define RG_DSI_LNT3_LPTX_IMINUS		BIT(4)
+#define RG_DSI_LNT3_LPCD_IPLUS		BIT(5)
+#define RG_DSI_LNT3_LPCD_IMINUS		BIT(6)
+#define RG_DSI_LNT3_RT_CODE		(0xf << 8)
+
+#define MIPITX_DSI_TOP_CON	0x40
+#define RG_DSI_LNT_INTR_EN		BIT(0)
+#define RG_DSI_LNT_HS_BIAS_EN		BIT(1)
+#define RG_DSI_LNT_IMP_CAL_EN		BIT(2)
+#define RG_DSI_LNT_TESTMODE_EN		BIT(3)
+#define RG_DSI_LNT_IMP_CAL_CODE		(0xf << 4)
+#define RG_DSI_LNT_AIO_SEL		(7 << 8)
+#define RG_DSI_PAD_TIE_LOW_EN		BIT(11)
+#define RG_DSI_DEBUG_INPUT_EN		BIT(12)
+#define RG_DSI_PRESERVE			(7 << 13)
+
+#define MIPITX_DSI_BG_CON	0x44
+#define RG_DSI_BG_CORE_EN		BIT(0)
+#define RG_DSI_BG_CKEN			BIT(1)
+#define RG_DSI_BG_DIV			(0x3 << 2)
+#define RG_DSI_BG_FAST_CHARGE		BIT(4)
+#define RG_DSI_VOUT_MSK			(0x3ffff << 5)
+#define RG_DSI_V12_SEL			(7 << 5)
+#define RG_DSI_V10_SEL			(7 << 8)
+#define RG_DSI_V072_SEL			(7 << 11)
+#define RG_DSI_V04_SEL			(7 << 14)
+#define RG_DSI_V032_SEL			(7 << 17)
+#define RG_DSI_V02_SEL			(7 << 20)
+#define RG_DSI_BG_R1_TRIM		(0xf << 24)
+#define RG_DSI_BG_R2_TRIM		(0xf << 28)
+
+#define MIPITX_DSI_PLL_CON0	0x50
+#define RG_DSI_MPPLL_PLL_EN		BIT(0)
+#define RG_DSI_MPPLL_DIV_MSK		(0x1ff << 1)
+#define RG_DSI_MPPLL_PREDIV		(3 << 1)
+#define RG_DSI_MPPLL_TXDIV0		(3 << 3)
+#define RG_DSI_MPPLL_TXDIV1		(3 << 5)
+#define RG_DSI_MPPLL_POSDIV		(7 << 7)
+#define RG_DSI_MPPLL_MONVC_EN		BIT(10)
+#define RG_DSI_MPPLL_MONREF_EN		BIT(11)
+#define RG_DSI_MPPLL_VOD_EN		BIT(12)
+
+#define MIPITX_DSI_PLL_CON1	0x54
+#define RG_DSI_MPPLL_SDM_FRA_EN		BIT(0)
+#define RG_DSI_MPPLL_SDM_SSC_PH_INIT	BIT(1)
+#define RG_DSI_MPPLL_SDM_SSC_EN		BIT(2)
+#define RG_DSI_MPPLL_SDM_SSC_PRD	(0xffff << 16)
+
+#define MIPITX_DSI_PLL_CON2	0x58
+
+#define MIPITX_DSI_PLL_PWR	0x68
+#define RG_DSI_MPPLL_SDM_PWR_ON		BIT(0)
+#define RG_DSI_MPPLL_SDM_ISO_EN		BIT(1)
+#define RG_DSI_MPPLL_SDM_PWR_ACK	BIT(8)
+
+#define MIPITX_DSI_SW_CTRL	0x80
+#define SW_CTRL_EN			BIT(0)
+
+#define MIPITX_DSI_SW_CTRL_CON0	0x84
+#define SW_LNTC_LPTX_PRE_OE		BIT(0)
+#define SW_LNTC_LPTX_OE			BIT(1)
+#define SW_LNTC_LPTX_P			BIT(2)
+#define SW_LNTC_LPTX_N			BIT(3)
+#define SW_LNTC_HSTX_PRE_OE		BIT(4)
+#define SW_LNTC_HSTX_OE			BIT(5)
+#define SW_LNTC_HSTX_ZEROCLK		BIT(6)
+#define SW_LNT0_LPTX_PRE_OE		BIT(7)
+#define SW_LNT0_LPTX_OE			BIT(8)
+#define SW_LNT0_LPTX_P			BIT(9)
+#define SW_LNT0_LPTX_N			BIT(10)
+#define SW_LNT0_HSTX_PRE_OE		BIT(11)
+#define SW_LNT0_HSTX_OE			BIT(12)
+#define SW_LNT0_LPRX_EN			BIT(13)
+#define SW_LNT1_LPTX_PRE_OE		BIT(14)
+#define SW_LNT1_LPTX_OE			BIT(15)
+#define SW_LNT1_LPTX_P			BIT(16)
+#define SW_LNT1_LPTX_N			BIT(17)
+#define SW_LNT1_HSTX_PRE_OE		BIT(18)
+#define SW_LNT1_HSTX_OE			BIT(19)
+#define SW_LNT2_LPTX_PRE_OE		BIT(20)
+#define SW_LNT2_LPTX_OE			BIT(21)
+#define SW_LNT2_LPTX_P			BIT(22)
+#define SW_LNT2_LPTX_N			BIT(23)
+#define SW_LNT2_HSTX_PRE_OE		BIT(24)
+#define SW_LNT2_HSTX_OE			BIT(25)
+
+struct mtk_mipi_tx {
+	void __iomem *regs;
+	unsigned int data_rate;
+};
+
+static void mtk_mipi_tx_mask(struct mtk_mipi_tx *mipi_tx, u32 offset, u32 mask,
+			     u32 data)
+{
+	u32 temp = readl(mipi_tx->regs + offset);
+
+	writel((temp & ~mask) | (data & mask), mipi_tx->regs + offset);
+}
+
+int mtk_mipi_tx_set_data_rate(struct phy *phy, unsigned int data_rate)
+{
+	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
+
+	if (data_rate < 50 || data_rate > 1250)
+		return -EINVAL;
+
+	mipi_tx->data_rate = data_rate;
+
+	return 0;
+}
+
+static int mtk_mipi_tx_power_on(struct phy *phy)
+{
+	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
+	unsigned int txdiv, txdiv0, txdiv1;
+	u64 pcw;
+
+	if (mipi_tx->data_rate >= 500) {
+		txdiv = 1;
+		txdiv0 = 0;
+		txdiv1 = 0;
+	} else if (mipi_tx->data_rate >= 250) {
+		txdiv = 2;
+		txdiv0 = 1;
+		txdiv1 = 0;
+	} else if (mipi_tx->data_rate >= 125) {
+		txdiv = 4;
+		txdiv0 = 2;
+		txdiv1 = 0;
+	} else if (mipi_tx->data_rate > 62) {
+		txdiv = 8;
+		txdiv0 = 2;
+		txdiv1 = 1;
+	} else if (mipi_tx->data_rate >= 50) {
+		txdiv = 16;
+		txdiv0 = 2;
+		txdiv1 = 2;
+	} else {
+		return -EINVAL;
+	}
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_BG_CON,
+			 RG_DSI_VOUT_MSK | RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN,
+			 (4 << 20) | (4 << 17) | (4 << 14) |
+			 (4 << 11) | (4 << 8) | (4 << 5) |
+			 RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN);
+
+	usleep_range(30, 100);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_TOP_CON,
+			 RG_DSI_LNT_IMP_CAL_CODE | RG_DSI_LNT_HS_BIAS_EN,
+			 (8 << 4) | RG_DSI_LNT_HS_BIAS_EN);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_CON,
+			 RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN,
+			 RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_PWR,
+			 RG_DSI_MPPLL_SDM_PWR_ON | RG_DSI_MPPLL_SDM_ISO_EN,
+			 RG_DSI_MPPLL_SDM_PWR_ON);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON0, RG_DSI_MPPLL_PLL_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON0,
+			 RG_DSI_MPPLL_TXDIV0 | RG_DSI_MPPLL_TXDIV1 |
+			 RG_DSI_MPPLL_PREDIV,
+			 (txdiv0 << 3) | (txdiv1 << 5));
+
+	/*
+	 * PLL PCW config
+	 * PCW bit 24~30 = integer part of pcw
+	 * PCW bit 0~23 = fractional part of pcw
+	 * pcw = data_Rate*4*txdiv/(Ref_clk*2);
+	 * Post DIV =4, so need data_Rate*4
+	 * Ref_clk is 26MHz
+	 */
+	pcw = ((u64) mipi_tx->data_rate * txdiv) << 24;
+	pcw /= 13;
+	writel(pcw, mipi_tx->regs + MIPITX_DSI_PLL_CON2);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON1,
+			 RG_DSI_MPPLL_SDM_FRA_EN, RG_DSI_MPPLL_SDM_FRA_EN);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_CLOCK_LANE,
+			 RG_DSI_LNTC_LDOOUT_EN, RG_DSI_LNTC_LDOOUT_EN);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE0,
+			 RG_DSI_LNT0_LDOOUT_EN, RG_DSI_LNT0_LDOOUT_EN);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE1,
+			 RG_DSI_LNT1_LDOOUT_EN, RG_DSI_LNT1_LDOOUT_EN);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE2,
+			 RG_DSI_LNT2_LDOOUT_EN, RG_DSI_LNT2_LDOOUT_EN);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE3,
+			 RG_DSI_LNT3_LDOOUT_EN, RG_DSI_LNT3_LDOOUT_EN);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON0,
+			 RG_DSI_MPPLL_PLL_EN, RG_DSI_MPPLL_PLL_EN);
+
+	usleep_range(20, 100);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON1,
+			 RG_DSI_MPPLL_SDM_SSC_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_TOP_CON, RG_DSI_PAD_TIE_LOW_EN, 0);
+
+	return 0;
+}
+
+static int mtk_mipi_tx_power_off(struct phy *phy)
+{
+	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON0, RG_DSI_MPPLL_PLL_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_TOP_CON, RG_DSI_PAD_TIE_LOW_EN,
+			RG_DSI_PAD_TIE_LOW_EN);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_CLOCK_LANE,
+			 RG_DSI_LNTC_LDOOUT_EN, 0);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE0,
+			 RG_DSI_LNT0_LDOOUT_EN, 0);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE1,
+			 RG_DSI_LNT1_LDOOUT_EN, 0);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE2,
+			 RG_DSI_LNT2_LDOOUT_EN, 0);
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_DATA_LANE3,
+			 RG_DSI_LNT3_LDOOUT_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_PWR,
+			RG_DSI_MPPLL_SDM_ISO_EN | RG_DSI_MPPLL_SDM_PWR_ON,
+			RG_DSI_MPPLL_SDM_ISO_EN);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_TOP_CON, RG_DSI_LNT_HS_BIAS_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_CON,
+			RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_BG_CON,
+			RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN, 0);
+
+	mtk_mipi_tx_mask(mipi_tx, MIPITX_DSI_PLL_CON0, RG_DSI_MPPLL_DIV_MSK, 0);
+
+	return 0;
+}
+
+static struct phy_ops mtk_mipi_tx_ops = {
+	.power_on = mtk_mipi_tx_power_on,
+	.power_off = mtk_mipi_tx_power_off,
+	.owner = THIS_MODULE,
+};
+
+static int mtk_mipi_tx_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_mipi_tx *mipi_tx;
+	struct resource *mem;
+	struct phy *phy;
+	struct phy_provider *phy_provider;
+	int ret;
+
+	mipi_tx = devm_kzalloc(dev, sizeof(*mipi_tx), GFP_KERNEL);
+	if (!mipi_tx)
+		return -ENOMEM;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mipi_tx->regs = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(mipi_tx->regs)) {
+		ret = PTR_ERR(mipi_tx->regs);
+		dev_err(dev, "Failed to get memory resource: %d\n", ret);
+		return ret;
+	}
+
+	phy = devm_phy_create(dev, NULL, &mtk_mipi_tx_ops);
+	if (IS_ERR(phy)) {
+		dev_err(dev, "Failed to create MIPI D-PHY\n");
+		return PTR_ERR(phy);
+	}
+	phy_set_drvdata(phy, mipi_tx);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static int mtk_mipi_tx_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id mtk_mipi_tx_match[] = {
+	{ .compatible = "mediatek,mt8173-mipi-tx", },
+	{},
+};
+
+struct platform_driver mtk_mipi_tx_driver = {
+	.probe = mtk_mipi_tx_probe,
+	.remove = mtk_mipi_tx_remove,
+	.driver = {
+		.name = "mediatek-mipi-tx",
+		.of_match_table = mtk_mipi_tx_match,
+	},
+};
diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
new file mode 100644
index 0000000..35f4a10
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
@@ -0,0 +1,21 @@
+/*
+ * 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.
+ */
+
+#ifndef _MTK_MIPI_TX_H_
+#define _MTK_MIPI_TX_H
+
+struct phy;
+
+int mtk_mipi_tx_set_data_rate(struct phy *phy, unsigned int data_rate);
+
+#endif