[RFC PATCH 3/4] video: display: Add exynos-dsi video source driver

[Tomasz Figa <t.figa@samsung.com>]

This patch adds new driver for DSI master block available in Samsung
Exynos SoCs. The driver is designed and written specifically for Common
Display Framework.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/video/display/Kconfig             |    3 +
 drivers/video/display/Makefile            |    1 +
 drivers/video/display/source-exynos_dsi.c | 1313 +++++++++++++++++++++++++++++
 include/video/exynos_dsi.h                |   41 +
 4 files changed, 1358 insertions(+)
 create mode 100644 drivers/video/display/source-exynos_dsi.c
 create mode 100644 include/video/exynos_dsi.h

diff --git a/drivers/video/display/Kconfig b/drivers/video/display/Kconfig
index 477192d..b14527a 100644
--- a/drivers/video/display/Kconfig
+++ b/drivers/video/display/Kconfig
@@ -6,5 +6,8 @@ menuconfig DISPLAY_CORE
 if DISPLAY_CORE
 
 
+config DISPLAY_SOURCE_EXYNOS_DSI
+	tristate "Samsung SoC MIPI DSI Master"
+
 
 endif # DISPLAY_CORE
diff --git a/drivers/video/display/Makefile b/drivers/video/display/Makefile
index bd93496..40a283a 100644
--- a/drivers/video/display/Makefile
+++ b/drivers/video/display/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_DISPLAY_CORE) += display-core.o
+obj-$(CONFIG_DISPLAY_SOURCE_EXYNOS_DSI) += source-exynos_dsi.o
diff --git a/drivers/video/display/source-exynos_dsi.c b/drivers/video/display/source-exynos_dsi.c
new file mode 100644
index 0000000..30b15bf
--- /dev/null
+++ b/drivers/video/display/source-exynos_dsi.c
@@ -0,0 +1,1313 @@
+/*
+ * Samsung SoC MIPI DSI Master driver.
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd
+ *
+ * Contacts: Tomasz Figa <t.figa@samsung.com>
+ *
+ * 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.
+*/
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/memory.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spinlock.h>
+#include <linux/videomode.h>
+#include <linux/wait.h>
+
+#include <video/display.h>
+#include <video/exynos_dsi.h>
+#include <video/mipi_display.h>
+
+#define DSIM_STATUS_REG		0x0	/* Status register */
+#define DSIM_SWRST_REG		0x4	/* Software reset register */
+#define DSIM_CLKCTRL_REG	0x8	/* Clock control register */
+#define DSIM_TIMEOUT_REG	0xc	/* Time out register */
+#define DSIM_CONFIG_REG		0x10	/* Configuration register */
+#define DSIM_ESCMODE_REG	0x14	/* Escape mode register */
+
+/* Main display image resolution register */
+#define DSIM_MDRESOL_REG	0x18
+#define DSIM_MVPORCH_REG	0x1c	/* Main display Vporch register */
+#define DSIM_MHPORCH_REG	0x20	/* Main display Hporch register */
+#define DSIM_MSYNC_REG		0x24	/* Main display sync area register */
+
+/* Sub display image resolution register */
+#define DSIM_SDRESOL_REG	0x28
+#define DSIM_INTSRC_REG		0x2c	/* Interrupt source register */
+#define DSIM_INTMSK_REG		0x30	/* Interrupt mask register */
+#define DSIM_PKTHDR_REG		0x34	/* Packet Header FIFO register */
+#define DSIM_PAYLOAD_REG	0x38	/* Payload FIFO register */
+#define DSIM_RXFIFO_REG		0x3c	/* Read FIFO register */
+#define DSIM_FIFOTHLD_REG	0x40	/* FIFO threshold level register */
+#define DSIM_FIFOCTRL_REG	0x44	/* FIFO status and control register */
+
+/* FIFO memory AC characteristic register */
+#define DSIM_PLLCTRL_REG	0x4c	/* PLL control register */
+#define DSIM_PLLTMR_REG		0x50	/* PLL timer register */
+#define DSIM_PHYACCHR_REG	0x54	/* D-PHY AC characteristic register */
+#define DSIM_PHYACCHR1_REG	0x58	/* D-PHY AC characteristic register1 */
+
+/* DSIM_STATUS */
+#define DSIM_STOP_STATE_DAT(x)		(((x) & 0xf) << 0)
+#define DSIM_STOP_STATE_CLK		(1 << 8)
+#define DSIM_TX_READY_HS_CLK		(1 << 10)
+#define DSIM_PLL_STABLE			(1 << 31)
+
+/* DSIM_SWRST */
+#define DSIM_FUNCRST			(1 << 16)
+#define DSIM_SWRST			(1 << 0)
+
+/* DSIM_TIMEOUT */
+#define DSIM_LPDR_TOUT(x)		((x) << 0)
+#define DSIM_BTA_TOUT(x)		((x) << 16)
+
+/* DSIM_CLKCTRL */
+#define DSIM_ESC_PRESCALER(x)		(((x) & 0xffff) << 0)
+#define DSIM_ESC_PRESCALER_MASK		(0xffff << 0)
+#define DSIM_LANE_ESC_CLK_EN_CLK	(1 << 19)
+#define DSIM_LANE_ESC_CLK_EN_DATA(x)	(((x) & 0xf) << 20)
+#define DSIM_LANE_ESC_CLK_EN_DATA_MASK	(0xf << 20)
+#define DSIM_BYTE_CLKEN			(1 << 24)
+#define DSIM_BYTE_CLK_SRC(x)		(((x) & 0x3) << 25)
+#define DSIM_BYTE_CLK_SRC_MASK		(0x3 << 25)
+#define DSIM_PLL_BYPASS			(1 << 27)
+#define DSIM_ESC_CLKEN			(1 << 28)
+#define DSIM_TX_REQUEST_HSCLK		(1 << 31)
+
+/* DSIM_CONFIG */
+#define DSIM_LANE_EN_CLK		(1 << 0)
+#define DSIM_LANE_EN(x)			(((x) & 0xf) << 1)
+#define DSIM_NUM_OF_DATA_LANE(x)	(((x) & 0x3) << 5)
+#define DSIM_SUB_PIX_FORMAT(x)		(((x) & 0x7) << 8)
+#define DSIM_MAIN_PIX_FORMAT_MASK	(0x7 << 12)
+#define DSIM_MAIN_PIX_FORMAT_RGB888	(0x7 << 12)
+#define DSIM_MAIN_PIX_FORMAT_RGB666	(0x6 << 12)
+#define DSIM_MAIN_PIX_FORMAT_RGB666_P	(0x5 << 12)
+#define DSIM_MAIN_PIX_FORMAT_RGB565	(0x4 << 12)
+#define DSIM_SUB_VC			(((x) & 0x3) << 16)
+#define DSIM_MAIN_VC			(((x) & 0x3) << 18)
+#define DSIM_HSA_MODE			(1 << 20)
+#define DSIM_HBP_MODE			(1 << 21)
+#define DSIM_HFP_MODE			(1 << 22)
+#define DSIM_HSE_MODE			(1 << 23)
+#define DSIM_AUTO_MODE			(1 << 24)
+#define DSIM_VIDEO_MODE			(1 << 25)
+#define DSIM_BURST_MODE			(1 << 26)
+#define DSIM_SYNC_INFORM		(1 << 27)
+#define DSIM_EOT_DISABLE		(1 << 28)
+#define DSIM_MFLUSH_VS			(1 << 29)
+
+/* DSIM_ESCMODE */
+#define DSIM_TX_LPDT_LP			(1 << 6)
+#define DSIM_CMD_LPDT_LP		(1 << 7)
+#define DSIM_FORCE_STOP_STATE		(1 << 20)
+#define DSIM_STOP_STATE_CNT(x)		(((x) & 0x7ff) << 21)
+#define DSIM_STOP_STATE_CNT_MASK	(0x7ff << 21)
+
+/* DSIM_MDRESOL */
+#define DSIM_MAIN_STAND_BY		(1 << 31)
+#define DSIM_MAIN_VRESOL(x)		(((x) & 0x7ff) << 16)
+#define DSIM_MAIN_HRESOL(x)		(((x) & 0X7ff) << 0)
+
+/* DSIM_MVPORCH */
+#define DSIM_CMD_ALLOW(x)		((x) << 28)
+#define DSIM_STABLE_VFP(x)		((x) << 16)
+#define DSIM_MAIN_VBP(x)		((x) << 0)
+#define DSIM_CMD_ALLOW_MASK		(0xf << 28)
+#define DSIM_STABLE_VFP_MASK		(0x7ff << 16)
+#define DSIM_MAIN_VBP_MASK		(0x7ff << 0)
+
+/* DSIM_MHPORCH */
+#define DSIM_MAIN_HFP(x)		((x) << 16)
+#define DSIM_MAIN_HBP(x)		((x) << 0)
+#define DSIM_MAIN_HFP_MASK		((0xffff) << 16)
+#define DSIM_MAIN_HBP_MASK		((0xffff) << 0)
+
+/* DSIM_MSYNC */
+#define DSIM_MAIN_VSA(x)		((x) << 22)
+#define DSIM_MAIN_HSA(x)		((x) << 0)
+#define DSIM_MAIN_VSA_MASK		((0x3ff) << 22)
+#define DSIM_MAIN_HSA_MASK		((0xffff) << 0)
+
+/* DSIM_SDRESOL */
+#define DSIM_SUB_STANDY(x)		((x) << 31)
+#define DSIM_SUB_VRESOL(x)		((x) << 16)
+#define DSIM_SUB_HRESOL(x)		((x) << 0)
+#define DSIM_SUB_STANDY_MASK		((0x1) << 31)
+#define DSIM_SUB_VRESOL_MASK		((0x7ff) << 16)
+#define DSIM_SUB_HRESOL_MASK		((0x7ff) << 0)
+
+/* DSIM_INTSRC */
+#define DSIM_INT_PLL_STABLE		(1 << 31)
+#define DSIM_INT_SW_RST_RELEASE		(1 << 30)
+#define DSIM_INT_SFR_FIFO_EMPTY		(1 << 29)
+#define DSIM_INT_BTA			(1 << 25)
+#define DSIM_INT_FRAME_DONE		(1 << 24)
+#define DSIM_INT_RX_TIMEOUT		(1 << 21)
+#define DSIM_INT_BTA_TIMEOUT		(1 << 20)
+#define DSIM_INT_RX_DONE		(1 << 18)
+#define DSIM_INT_RX_TE			(1 << 17)
+#define DSIM_INT_RX_ACK			(1 << 16)
+#define DSIM_INT_RX_ECC_ERR		(1 << 15)
+#define DSIM_INT_RX_CRC_ERR		(1 << 14)
+
+/* DSIM_FIFOCTRL */
+#define SFR_HEADER_EMPTY		(1 << 22)
+
+/* DSIM_PHYACCHR */
+#define DSIM_AFC_EN			(1 << 14)
+#define DSIM_AFC_CTL(x)			(((x) & 0x7) << 5)
+
+/* DSIM_PLLCTRL */
+#define DSIM_FREQ_BAND(x)		((x) << 24)
+#define DSIM_PLL_EN			(1 << 23)
+#define DSIM_PLL_P(x)			((x) << 13)
+#define DSIM_PLL_M(x)			((x) << 4)
+#define DSIM_PLL_S(x)			((x) << 1)
+
+#define DSI_MAX_BUS_WIDTH		4
+#define DSI_NUM_VIRTUAL_CHANNELS	4
+#define DSI_TX_FIFO_SIZE		2048
+#define DSI_XFER_TIMEOUT_MS		100
+
+enum exynos_dsi_transfer_type {
+	EXYNOS_DSI_TX,
+	EXYNOS_DSI_RX,
+};
+
+struct exynos_dsi_transfer {
+	struct list_head list;
+	struct completion completed;
+	int result;
+	u8 type;
+	u8 data[2];
+
+	const u8 *tx_payload;
+	u16 tx_len;
+	u16 tx_done;
+
+	u8 *rx_payload;
+	u16 rx_len;
+	u16 rx_done;
+};
+
+struct exynos_dsi {
+	struct video_source out;
+	struct mipi_dsi_interface_params params;
+	bool streaming;
+
+	struct device *dev;
+	struct resource *res;
+	struct clk *pll_clk;
+	struct clk *bus_clk;
+	unsigned int irq;
+	void __iomem *reg_base;
+	struct regulator_bulk_data supplies[2];
+	struct exynos_dsi_platform_data *pd;
+
+	spinlock_t transfer_lock;
+	struct list_head transfer_list;
+	bool hs_mode;
+};
+
+#define src_to_dsi(src)		container_of(src, struct exynos_dsi, out)
+
+/*
+ * H/W control
+ */
+
+static void exynos_dsi_reset(struct exynos_dsi *dsi)
+{
+	writel(DSIM_SWRST, dsi->reg_base + DSIM_SWRST_REG);
+
+	udelay(10);
+}
+
+#ifndef MHZ
+#define MHZ	(1000*1000)
+#endif
+
+static const unsigned long freq_bands[] = {
+	100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ,
+	270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ,
+	510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ,
+	770 * MHZ, 870 * MHZ, 950 * MHZ,
+};
+
+static const int afc_settings[] = {
+	1, 0, 3, 2, 5, 4,
+};
+
+static unsigned long exynos_dsi_pll_find_pms(struct exynos_dsi *dsi,
+		unsigned long fin, unsigned long fout, u8 *p, u16 *m, u8 *s)
+{
+	unsigned long best_freq = 0;
+	u32 min_delta = 0xffffffff;
+	u8 p_min, p_max;
+	u8 _p, best_p;
+	u16 _m, best_m;
+	u8 _s, best_s;
+
+	p_min = DIV_ROUND_UP(fin, (12 * MHZ));
+	p_max = fin / (6 * MHZ);
+
+	for (_p = p_min; _p <= p_max; ++_p) {
+		for (_s = 0; _s <= 5; ++_s) {
+			u64 tmp;
+			u32 delta;
+			u16 div;
+
+			tmp = (u64)fout * (_p << _s);
+			do_div(tmp, fin);
+			_m = tmp;
+			if (_m < 41 || _m > 125)
+				continue;
+
+			tmp = (u64)_m * fin;
+			do_div(tmp, _p);
+			if (tmp < 500 * MHZ || tmp > 1000 * MHZ)
+				continue;
+
+			tmp = (u64)_m * fin;
+			div = (_p << _s);
+			do_div(tmp, div);
+
+			delta = abs(fout - tmp);
+			if (delta < min_delta) {
+				best_p = _p;
+				best_m = _m;
+				best_s = _s;
+				min_delta = delta;
+				best_freq = tmp;
+			}
+		}
+	}
+
+	if (best_freq) {
+		*p = best_p;
+		*m = best_m;
+		*s = best_s;
+	}
+
+	return best_freq;
+}
+
+static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi,
+							unsigned long freq)
+{
+	unsigned long fin, fout, fin_pll;
+	int timeout;
+	u8 p;
+	u16 m;
+	u8 s;
+	int band;
+	int afc;
+	u32 reg;
+
+	clk_set_rate(dsi->pll_clk, dsi->pd->pll_clk_rate);
+
+	fin = clk_get_rate(dsi->pll_clk);
+	if (!fin) {
+		dev_err(dsi->dev, "failed to get PLL clock frequency\n");
+		return 0;
+	}
+
+	dev_dbg(dsi->dev, "PLL input frequency: %lu\n", fin);
+
+	fout = exynos_dsi_pll_find_pms(dsi, fin, freq, &p, &m, &s);
+	if (!fout) {
+		dev_err(dsi->dev,
+			"failed to find PLL coefficients for requested frequency\n");
+		return -EFAULT;
+	}
+
+	dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d)\n", fout, p, m, s);
+
+	for (band = 0; band < ARRAY_SIZE(freq_bands); ++band)
+		if (fout < freq_bands[band])
+			break;
+
+	fin_pll = DIV_ROUND_CLOSEST(fin, p);
+	fin_pll /= MHZ;
+	if (fin_pll > 6)
+		fin_pll -= 6;
+	else
+		fin_pll = 0;
+	if (fin_pll >= ARRAY_SIZE(afc_settings))
+		fin_pll = ARRAY_SIZE(afc_settings) - 1;
+
+	afc = afc_settings[fin_pll];
+
+	dev_dbg(dsi->dev, "freq band %d, afc_setting %d\n", band, afc);
+
+	writel(dsi->pd->pll_stable_time, dsi->reg_base + DSIM_PLLTMR_REG);
+
+	reg = DSIM_AFC_CTL(afc) | DSIM_AFC_EN;
+	writel(reg, dsi->reg_base + DSIM_PHYACCHR_REG);
+
+	reg = DSIM_FREQ_BAND(band) | DSIM_PLL_EN
+			| DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s);
+	writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG);
+
+	timeout = 1000;
+	do {
+		if (timeout-- = 0) {
+			dev_err(dsi->dev, "PLL failed to stabilize\n");
+			return -EFAULT;
+		}
+		reg = readl(dsi->reg_base + DSIM_STATUS_REG);
+	} while ((reg & DSIM_PLL_STABLE) = 0);
+
+	return fout;
+}
+
+static int exynos_dsi_enable_clock(struct exynos_dsi *dsi)
+{
+	unsigned long hs_clk, byte_clk, esc_clk;
+	unsigned long esc_div;
+	u32 reg;
+
+	hs_clk = exynos_dsi_set_pll(dsi, dsi->params.hs_clk_freq);
+	if (!hs_clk) {
+		dev_err(dsi->dev, "failed to configure DSI PLL\n");
+		return -EFAULT;
+	}
+
+	byte_clk = hs_clk / 8;
+	esc_div = DIV_ROUND_UP(byte_clk, dsi->params.esc_clk_freq);
+	esc_clk = byte_clk / esc_div;
+
+	if (esc_clk > 20 * MHZ) {
+		++esc_div;
+		esc_clk = byte_clk / esc_div;
+	}
+
+	dev_dbg(dsi->dev, "hs_clk = %lu, byte_clk = %lu, esc_clk = %lu\n",
+						hs_clk, byte_clk, esc_clk);
+
+	reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG);
+	reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK
+			| DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS
+			| DSIM_BYTE_CLK_SRC_MASK);
+	reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN
+			| DSIM_ESC_PRESCALER(esc_div)
+			| DSIM_LANE_ESC_CLK_EN_CLK
+			| DSIM_LANE_ESC_CLK_EN_DATA(dsi->params.data_lanes)
+			| DSIM_BYTE_CLK_SRC(0)
+			| DSIM_TX_REQUEST_HSCLK;
+	writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG);
+
+	return 0;
+}
+
+static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
+{
+	u32 reg;
+
+	reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG);
+	reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK |
+			DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN);
+	writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG);
+
+	reg = readl(dsi->reg_base + DSIM_PLLCTRL_REG);
+	reg &= ~DSIM_PLL_EN;
+	writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG);
+}
+
+static int exynos_dsi_init_link(struct exynos_dsi *dsi)
+{
+	u32 reg;
+	int timeout;
+
+	/* Initialize FIFO pointers */
+	reg = readl(dsi->reg_base + DSIM_FIFOCTRL_REG);
+	reg &= ~0x1f;
+	writel(reg, dsi->reg_base + DSIM_FIFOCTRL_REG);
+
+	msleep(10);
+
+	reg |= 0x1f;
+	writel(reg, dsi->reg_base + DSIM_FIFOCTRL_REG);
+
+	msleep(10);
+
+	/* DSI configuration */
+	reg = 0;
+
+	if (dsi->params.mode & DSI_MODE_VIDEO) {
+		reg |= DSIM_VIDEO_MODE;
+
+		if (!(dsi->params.mode & DSI_MODE_VSYNC_FLUSH))
+			reg |= DSIM_MFLUSH_VS;
+		if (!(dsi->params.mode & DSI_MODE_EOT_PACKET))
+			reg |= DSIM_EOT_DISABLE;
+		if (dsi->params.mode & DSI_MODE_VIDEO_SYNC_PULSE)
+			reg |= DSIM_SYNC_INFORM;
+		if (dsi->params.mode & DSI_MODE_VIDEO_BURST)
+			reg |= DSIM_BURST_MODE;
+		if (dsi->params.mode & DSI_MODE_VIDEO_AUTO_VERT)
+			reg |= DSIM_AUTO_MODE;
+		if (dsi->params.mode & DSI_MODE_VIDEO_HSE)
+			reg |= DSIM_HSE_MODE;
+		if (!(dsi->params.mode & DSI_MODE_VIDEO_HFP))
+			reg |= DSIM_HFP_MODE;
+		if (!(dsi->params.mode & DSI_MODE_VIDEO_HBP))
+			reg |= DSIM_HBP_MODE;
+		if (!(dsi->params.mode & DSI_MODE_VIDEO_HSA))
+			reg |= DSIM_HSA_MODE;
+	}
+
+	switch (dsi->params.format) {
+	case DSI_FMT_RGB888:
+		reg |= DSIM_MAIN_PIX_FORMAT_RGB888;
+		break;
+	case DSI_FMT_RGB666:
+		reg |= DSIM_MAIN_PIX_FORMAT_RGB666;
+		break;
+	case DSI_FMT_RGB666_PACKED:
+		reg |= DSIM_MAIN_PIX_FORMAT_RGB666_P;
+		break;
+	case DSI_FMT_RGB565:
+		reg |= DSIM_MAIN_PIX_FORMAT_RGB565;
+		break;
+	default:
+		dev_err(dsi->dev, "invalid pixel format\n");
+		return -EINVAL;
+	}
+
+	switch (dsi->params.data_lanes) {
+	case 0x1:
+		reg |= DSIM_NUM_OF_DATA_LANE(0);
+		break;
+	case 0x3:
+		reg |= DSIM_NUM_OF_DATA_LANE(1);
+		break;
+	case 0x7:
+		reg |= DSIM_NUM_OF_DATA_LANE(2);
+		break;
+	case 0xf:
+		reg |= DSIM_NUM_OF_DATA_LANE(3);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
+
+	reg |= DSIM_LANE_EN_CLK;
+	writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
+
+	reg |= DSIM_LANE_EN(dsi->params.data_lanes);
+	writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
+
+	/* Clock configuration */
+	exynos_dsi_enable_clock(dsi);
+
+	/* Check clock and data lane state are stop state */
+	timeout = 100;
+	do {
+		if (timeout-- = 0) {
+			dev_err(dsi->dev, "waiting for bus lanes timed out\n");
+			return -EFAULT;
+		}
+
+		reg = readl(dsi->reg_base + DSIM_STATUS_REG);
+		if ((reg & DSIM_STOP_STATE_DAT(dsi->params.data_lanes))
+		    != DSIM_STOP_STATE_DAT(dsi->params.data_lanes))
+			continue;
+	} while (!(reg & (DSIM_STOP_STATE_CLK | DSIM_TX_READY_HS_CLK)));
+
+	reg = readl(dsi->reg_base + DSIM_ESCMODE_REG);
+	reg &= ~DSIM_STOP_STATE_CNT_MASK;
+	reg |= DSIM_STOP_STATE_CNT(dsi->pd->stop_holding_cnt);
+	writel(reg, dsi->reg_base + DSIM_ESCMODE_REG);
+
+	reg = DSIM_BTA_TOUT(dsi->pd->bta_timeout)
+					| DSIM_LPDR_TOUT(dsi->pd->rx_timeout);
+	writel(reg, dsi->reg_base + DSIM_TIMEOUT_REG);
+
+	return 0;
+}
+
+static int exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
+{
+	const struct videomode *mode;
+	u32 reg;
+	int ret;
+
+	ret = display_entity_get_modes(dsi->out.sink, &mode);
+	if (ret < 0) {
+		dev_err(dsi->dev, "failed to get display video mode\n");
+		return ret;
+	}
+
+	if (dsi->params.mode & DSI_MODE_VIDEO) {
+		reg = DSIM_CMD_ALLOW(dsi->params.cmd_allow)
+			| DSIM_STABLE_VFP(mode->vfront_porch)
+			| DSIM_MAIN_VBP(mode->vback_porch);
+		writel(reg, dsi->reg_base + DSIM_MVPORCH_REG);
+
+		reg = DSIM_MAIN_HFP(mode->hfront_porch)
+			| DSIM_MAIN_HBP(mode->hback_porch);
+		writel(reg, dsi->reg_base + DSIM_MHPORCH_REG);
+
+		reg = DSIM_MAIN_VSA(mode->vsync_len)
+			| DSIM_MAIN_HSA(mode->hsync_len);
+		writel(reg, dsi->reg_base + DSIM_MSYNC_REG);
+	}
+
+	reg = DSIM_MAIN_HRESOL(mode->hactive) | DSIM_MAIN_VRESOL(mode->vactive);
+	writel(reg, dsi->reg_base + DSIM_MDRESOL_REG);
+
+	dev_dbg(dsi->dev, "LCD width = %d, height = %d\n",
+						mode->hactive, mode->vactive);
+
+	return 0;
+}
+
+static void exynos_dsi_set_display_enable(struct exynos_dsi *dsi, bool enable)
+{
+	u32 reg;
+
+	reg = readl(dsi->reg_base + DSIM_MDRESOL_REG);
+	if (enable)
+		reg |= DSIM_MAIN_STAND_BY;
+	else
+		reg &= ~DSIM_MAIN_STAND_BY;
+	writel(reg, dsi->reg_base +DSIM_MDRESOL_REG);
+}
+
+/*
+ * FIFO
+ */
+
+static void exynos_dsi_send_to_fifo(struct exynos_dsi *dsi,
+					struct exynos_dsi_transfer *xfer)
+{
+	const u8 *payload = xfer->tx_payload + xfer->tx_done;
+	u16 length = xfer->tx_len - xfer->tx_done;
+	bool first = !xfer->tx_done;
+	u32 reg;
+
+	dev_dbg(dsi->dev,
+		"< xfer %p, tx_len %u, tx_done %u, rx_len %u, rx_done %u\n",
+		xfer, xfer->tx_len, xfer->tx_done, xfer->rx_len, xfer->rx_done);
+
+	if (length > DSI_TX_FIFO_SIZE)
+		length = DSI_TX_FIFO_SIZE;
+
+	xfer->tx_done += length;
+
+	/* Send payload */
+	while (length >= 4) {
+		reg = (payload[3] << 24) | (payload[2] << 16)
+					| (payload[1] << 8) | payload[0];
+		writel(reg, dsi->reg_base + DSIM_PAYLOAD_REG);
+		payload += 4;
+		length -= 4;
+	}
+
+	reg = 0;
+	switch (length) {
+	case 3:
+		reg |= payload[2] << 16;
+		/* Fall through */
+	case 2:
+		reg |= payload[1] << 8;
+		/* Fall through */
+	case 1:
+		reg |= payload[0];
+		writel(reg, dsi->reg_base + DSIM_PAYLOAD_REG);
+		break;
+	case 0:
+		/* Do nothing */
+		break;
+	}
+
+	/* Send packet header */
+	if (first) {
+		if (xfer->rx_len) {
+			reg = (xfer->rx_len << 8)
+				| MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE;
+			writel(reg, dsi->reg_base + DSIM_PKTHDR_REG);
+		}
+		reg = (xfer->data[1] << 16) | (xfer->data[0] << 8) | xfer->type;
+		writel(reg, dsi->reg_base + DSIM_PKTHDR_REG);
+	}
+}
+
+static void exynos_readl_from_fifo(struct exynos_dsi *dsi,
+					struct exynos_dsi_transfer *xfer)
+{
+	u8 *payload = xfer->rx_payload + xfer->rx_done;
+	bool first = !xfer->rx_done;
+	u16 length;
+	u32 reg;
+
+	if (first) {
+		reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
+		length = (reg >> 8) & 0xffff;
+		if (length > xfer->rx_len)
+			dev_dbg(dsi->dev,
+				"response too long (expected %u, got %u bytes)\n",
+				xfer->rx_len, length);
+		if (length < xfer->rx_len)
+			xfer->rx_len = length;
+	}
+
+	length = xfer->rx_len - xfer->rx_done;
+	xfer->rx_done += length;
+
+	/* Receive payload */
+	while (length >= 4) {
+		reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
+		payload[0] = (reg >>  0) & 0xff;
+		payload[1] = (reg >>  8) & 0xff;
+		payload[2] = (reg >> 16) & 0xff;
+		payload[3] = (reg >> 24) & 0xff;
+		payload += 4;
+		length -= 4;
+	}
+
+	if (length) {
+		reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
+		switch (length) {
+		case 3:
+			payload[2] = (reg >> 16) & 0xff;
+			/* Fall through */
+		case 2:
+			payload[1] = (reg >> 8) & 0xff;
+			/* Fall through */
+		case 1:
+			payload[0] = reg & 0xff;
+		}
+	}
+
+	do {
+		reg = readl(dsi->reg_base + DSIM_RXFIFO_REG);
+	} while (reg != 0x30800002);
+}
+
+/*
+ * Transfer
+ */
+
+static void exynos_dsi_transfer_cancel(struct exynos_dsi *dsi,
+					struct exynos_dsi_transfer *xfer)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dsi->transfer_lock, flags);
+
+	if (!list_empty(&xfer->list))
+		list_del_init(&xfer->list);
+
+	spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+}
+
+static void exynos_dsi_transfer_start(struct exynos_dsi *dsi)
+{
+	unsigned long flags;
+	struct exynos_dsi_transfer *xfer;
+
+	spin_lock_irqsave(&dsi->transfer_lock, flags);
+
+	if (list_empty(&dsi->transfer_list)) {
+		spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+		return;
+	}
+
+	xfer = list_first_entry(&dsi->transfer_list,
+					struct exynos_dsi_transfer, list);
+
+	spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+
+	if (xfer->tx_len && xfer->tx_done = xfer->tx_len)
+		/* waiting for RX */
+		return;
+
+	exynos_dsi_send_to_fifo(dsi, xfer);
+}
+
+static void exynos_dsi_transfer_finish(struct exynos_dsi *dsi,
+					enum exynos_dsi_transfer_type type)
+{
+	struct exynos_dsi_transfer *xfer;
+	unsigned long flags;
+	bool start = true;
+
+	spin_lock_irqsave(&dsi->transfer_lock, flags);
+
+	if (list_empty(&dsi->transfer_list)) {
+		spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+		dev_warn(dsi->dev, "unexpected TX/RX interrupt\n");
+		return;
+	}
+
+	xfer = list_first_entry(&dsi->transfer_list,
+					struct exynos_dsi_transfer, list);
+
+	spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+
+	dev_dbg(dsi->dev,
+		"> xfer %p, tx_len %u, tx_done %u, rx_len %u, rx_done %u\n",
+		xfer, xfer->tx_len, xfer->tx_done, xfer->rx_len, xfer->rx_done);
+
+	if (type = EXYNOS_DSI_RX)
+		exynos_readl_from_fifo(dsi, xfer);
+
+	if (xfer->tx_done = xfer->tx_len && xfer->rx_done = xfer->rx_len) {
+		spin_lock_irqsave(&dsi->transfer_lock, flags);
+		list_del_init(&xfer->list);
+		start = !list_empty(&dsi->transfer_list);
+		spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+		xfer->result = 0;
+		complete(&xfer->completed);
+	}
+
+	if (type = EXYNOS_DSI_TX && xfer->tx_done != xfer->tx_len)
+		exynos_dsi_send_to_fifo(dsi, xfer);
+
+	if (start)
+		exynos_dsi_transfer_start(dsi);
+}
+
+static int exynos_dsi_transfer(struct exynos_dsi *dsi,
+		struct exynos_dsi_transfer *xfers, unsigned int num_xfers)
+{
+	unsigned long flags;
+	bool stopped;
+	LIST_HEAD(xfer_list);
+
+	for (; num_xfers; --num_xfers, ++xfers) {
+		xfers->tx_done = 0;
+		xfers->rx_done = 0;
+		xfers->result = -ETIMEDOUT;
+		init_completion(&xfers->completed);
+
+		list_add_tail(&xfers->list, &xfer_list);
+	}
+
+	spin_lock_irqsave(&dsi->transfer_lock, flags);
+
+	stopped = list_empty(&dsi->transfer_list);
+	list_splice_tail(&xfer_list, &dsi->transfer_list);
+
+	spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+
+	if (stopped)
+		exynos_dsi_transfer_start(dsi);
+
+	return 0;
+}
+
+/*
+ * Interrupt handler
+ */
+
+static irqreturn_t exynos_dsi_irq(int irq, void *dev_id)
+{
+	struct exynos_dsi *dsi = dev_id;
+	u32 status;
+
+	status = readl(dsi->reg_base + DSIM_INTSRC_REG);
+	writel(status, dsi->reg_base + DSIM_INTSRC_REG);
+
+	if (status & DSIM_INT_SW_RST_RELEASE) {
+		u32 mask = ~(DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY);
+		writel(mask, dsi->reg_base + DSIM_INTMSK_REG);
+		return IRQ_HANDLED;
+	}
+
+	if (status & DSIM_INT_RX_DONE) {
+		exynos_dsi_transfer_finish(dsi, EXYNOS_DSI_RX);
+		return IRQ_HANDLED;
+	}
+
+	if (status & DSIM_INT_SFR_FIFO_EMPTY) {
+		exynos_dsi_transfer_finish(dsi, EXYNOS_DSI_TX);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+/*
+ * Display source
+ */
+
+static int exynos_dsi_set_stream(struct video_source *src,
+					enum video_source_stream_state state)
+{
+	struct exynos_dsi *dsi = src_to_dsi(src);
+
+	if (pm_runtime_suspended(dsi->dev))
+		return -EINVAL;
+
+	switch (state) {
+	case DISPLAY_ENTITY_STREAM_STOPPED:
+		exynos_dsi_set_display_enable(dsi, false);
+		dsi->streaming = false;
+		break;
+
+	case DISPLAY_ENTITY_STREAM_CONTINUOUS:
+		exynos_dsi_set_display_mode(dsi);
+		exynos_dsi_set_display_enable(dsi, true);
+		dsi->streaming = true;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* enable/disable dsi bus */
+static int exynos_dsi_enable(struct video_source *src)
+{
+	struct display_entity_interface_params params;
+	struct exynos_dsi *dsi = src_to_dsi(src);
+	int ret;
+
+	ret = display_entity_get_params(src->sink, &params);
+	if (ret < 0)
+		return ret;
+	dsi->params = params.p.dsi;
+
+	ret = pm_runtime_get_sync(dsi->dev);
+	if (ret < 0)
+		return ret;
+
+	exynos_dsi_reset(dsi);
+	exynos_dsi_init_link(dsi);
+
+	return 0;
+}
+
+static int exynos_dsi_disable(struct video_source *src)
+{
+	struct exynos_dsi *dsi = src_to_dsi(src);
+
+	if (dsi->streaming)
+		return -EBUSY;
+
+	exynos_dsi_disable_clock(dsi);
+
+	return pm_runtime_put_sync(dsi->dev);
+}
+
+static void exynos_dsi_enable_hs(struct video_source *src, bool enable)
+{
+	struct exynos_dsi *dsi = src_to_dsi(src);
+	unsigned long flags;
+
+	spin_lock_irqsave(&dsi->transfer_lock, flags);
+
+	dsi->hs_mode = enable;
+
+	spin_unlock_irqrestore(&dsi->transfer_lock, flags);
+}
+
+/* data transfer */
+static int exynos_dsi_dcs_write(struct video_source *src, int channel,
+						const u8 *data, size_t len)
+{
+	struct exynos_dsi *dsi = src_to_dsi(src);
+	struct exynos_dsi_transfer xfer;
+	long ret;
+
+	if (!len)
+		return -EINVAL;
+
+	switch (len) {
+#if 0
+	/* FIXME: Fix handling of short packets */
+	case 1:
+		len = 0;
+		xfer.type = MIPI_DSI_DCS_SHORT_WRITE;
+		xfer.data[0] = data[0];
+		xfer.data[1] = 0;
+		break;
+	case 2:
+		len = 0;
+		xfer.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
+		xfer.data[0] = data[0];
+		xfer.data[1] = data[1];
+		break;
+#endif
+	default:
+		xfer.type = MIPI_DSI_DCS_LONG_WRITE;
+		xfer.data[0] = len & 0xff;
+		xfer.data[1] = len >> 8;
+	}
+	
+	xfer.tx_payload = data;
+	xfer.tx_len = len;
+	xfer.rx_len = 0;
+
+	ret = exynos_dsi_transfer(dsi, &xfer, 1);
+	if (ret < 0)
+		return ret;
+
+	wait_for_completion_timeout(&xfer.completed,
+					msecs_to_jiffies(DSI_XFER_TIMEOUT_MS));
+	if (xfer.result = -ETIMEDOUT) {
+		exynos_dsi_transfer_cancel(dsi, &xfer);
+		dev_err(dsi->dev, "xfer timed out\n");
+		return -ETIMEDOUT;
+	}
+
+	/* Also covers timeout condition */
+	return xfer.result;
+}
+
+static int exynos_dsi_dcs_read(struct video_source *src,
+				int channel, u8 dcs_cmd, u8 *data, size_t len)
+{
+	struct exynos_dsi *dsi = src_to_dsi(src);
+	struct exynos_dsi_transfer xfer;
+	long ret;
+
+	xfer.type = MIPI_DSI_DCS_READ;
+	xfer.tx_len = 0;
+	xfer.rx_payload = data;
+	xfer.rx_len = len;
+	xfer.data[0] = dcs_cmd;
+	xfer.data[1] = 0x00;
+
+	ret = exynos_dsi_transfer(dsi, &xfer, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = wait_for_completion_timeout(&xfer.completed,
+					msecs_to_jiffies(DSI_XFER_TIMEOUT_MS));
+	if (xfer.result = -ETIMEDOUT) {
+		exynos_dsi_transfer_cancel(dsi, &xfer);
+		dev_err(dsi->dev, "xfer timed out\n");
+		return -ETIMEDOUT;
+	}
+
+	/* Also covers timeout condition */
+	return xfer.result;
+}
+
+static const struct common_video_source_ops exynos_dsi_common_ops = {
+	.set_stream = exynos_dsi_set_stream,
+};
+
+static const struct dsi_video_source_ops exynos_dsi_ops = {
+	.enable = exynos_dsi_enable,
+	.disable = exynos_dsi_disable,
+
+	.enable_hs = exynos_dsi_enable_hs,
+
+	.dcs_write = exynos_dsi_dcs_write,
+	.dcs_read = exynos_dsi_dcs_read,
+};
+
+#ifdef CONFIG_OF
+/*
+ * Device Tree
+ */
+
+static int (* const of_phy_enables[])(struct platform_device *, bool) = {
+#ifdef CONFIG_S5P_SETUP_MIPIPHY
+	[0] = s5p_dsim_phy_enable,
+#endif
+};
+
+static struct exynos_dsi_platform_data *exynos_dsi_parse_dt(
+						struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct exynos_dsi_platform_data *dsi_pd;
+	struct device *dev = &pdev->dev;
+	const __be32 *prop_data;
+	u32 val;
+
+	dsi_pd = kzalloc(sizeof(*dsi_pd), GFP_KERNEL);
+	if (!dsi_pd) {
+		dev_err(dev, "failed to allocate dsi platform data\n");
+		return NULL;
+	}
+
+	prop_data = of_get_property(node, "samsung,phy-type", NULL);
+	if (!prop_data) {
+		dev_err(dev, "failed to get phy-type property\n");
+		goto err_free_pd;
+	}
+
+	val = be32_to_cpu(*prop_data);
+	if (val >= ARRAY_SIZE(of_phy_enables) || !of_phy_enables[val]) {
+		dev_err(dev, "Invalid phy-type %u\n", val);
+		goto err_free_pd;
+	}
+	dsi_pd->phy_enable = of_phy_enables[val];
+
+	prop_data = of_get_property(node, "samsung,pll-stable-time", NULL);
+	if (!prop_data) {
+		dev_err(dev, "failed to get pll-stable-time property\n");
+		goto err_free_pd;
+	}
+	dsi_pd->pll_stable_time = be32_to_cpu(*prop_data);
+
+	prop_data = of_get_property(node, "samsung,stop-holding-count", NULL);
+	if (!prop_data) {
+		dev_err(dev, "failed to get stop-holding-count property\n");
+		goto err_free_pd;
+	}
+	dsi_pd->stop_holding_cnt = be32_to_cpu(*prop_data);
+
+	prop_data = of_get_property(node, "samsung,bta-timeout", NULL);
+	if (!prop_data) {
+		dev_err(dev, "failed to get bta-timeout property\n");
+		goto err_free_pd;
+	}
+	dsi_pd->bta_timeout = be32_to_cpu(*prop_data);
+
+	prop_data = of_get_property(node, "samsung,rx-timeout", NULL);
+	if (!prop_data) {
+		dev_err(dev, "failed to get rx-timeout property\n");
+		goto err_free_pd;
+	}
+	dsi_pd->rx_timeout = be32_to_cpu(*prop_data);
+
+	prop_data = of_get_property(node, "samsung,pll-clk-freq", NULL);
+	if (!prop_data) {
+		dev_err(dev, "failed to get pll-clk-freq property\n");
+		goto err_free_pd;
+	}
+	dsi_pd->pll_clk_rate = be32_to_cpu(*prop_data);
+
+	return dsi_pd;
+
+err_free_pd:
+	kfree(dsi_pd);
+
+	return NULL;
+}
+
+static struct of_device_id exynos_dsi_of_match[] = {
+	{ .compatible = "samsung,exynos4210-mipi-dsi" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
+#else
+static struct exynos_dsi_platform_data *exynos_dsi_parse_dt(
+						struct platform_device *pdev)
+{
+	return NULL;
+}
+#endif
+
+/*
+ * Platform driver
+ */
+
+static int exynos_dsi_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct exynos_dsi *dsi;
+	int ret;
+
+	dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
+	if (!dsi) {
+		dev_err(&pdev->dev, "failed to allocate dsi object.\n");
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&dsi->transfer_lock);
+	INIT_LIST_HEAD(&dsi->transfer_list);
+
+	dsi->dev = &pdev->dev;
+	dsi->pd = pdev->dev.platform_data;
+
+	if (dsi->pd = NULL && pdev->dev.of_node)
+		dsi->pd = exynos_dsi_parse_dt(pdev);
+
+	if (dsi->pd = NULL) {
+		dev_err(&pdev->dev, "failed to get platform data for dsi.\n");
+		return -EINVAL;
+	}
+
+	dsi->supplies[0].supply = "vdd11";
+	dsi->supplies[1].supply = "vdd18";
+	ret = devm_regulator_bulk_get(&pdev->dev,
+				ARRAY_SIZE(dsi->supplies), dsi->supplies);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to get regulators: %d\n", ret);
+		return ret;
+	}
+
+	dsi->pll_clk = devm_clk_get(&pdev->dev, "pll_clk");
+	if (IS_ERR(dsi->pll_clk)) {
+		dev_err(&pdev->dev, "failed to get dsi pll input clock\n");
+		return -ENODEV;
+	}
+
+	dsi->bus_clk = devm_clk_get(&pdev->dev, "bus_clk");
+	if (IS_ERR(dsi->bus_clk)) {
+		dev_err(&pdev->dev, "failed to get dsi bus clock\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get io memory region\n");
+		return -ENODEV;
+	}
+
+	dsi->reg_base = devm_request_and_ioremap(&pdev->dev, res);
+	if (!dsi->reg_base) {
+		dev_err(&pdev->dev, "failed to remap io region\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, dsi);
+
+	pm_runtime_set_suspended(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	pm_runtime_get_sync(&pdev->dev);
+	writel(~0, dsi->reg_base + DSIM_INTMSK_REG);
+	pm_runtime_put_sync(&pdev->dev);
+
+	dsi->irq = platform_get_irq(pdev, 0);
+	if (dsi->irq < 0) {
+		dev_err(&pdev->dev, "failed to request dsi irq resource\n");
+		return -EINVAL;
+	}
+
+	ret = devm_request_irq(&pdev->dev, dsi->irq, exynos_dsi_irq,
+						0, dev_name(&pdev->dev), dsi);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request dsi irq\n");
+		return ret;
+	}
+
+	dsi->out.name = dev_name(&pdev->dev);
+	dsi->out.id = -1;
+	dsi->out.of_node = pdev->dev.of_node;
+	dsi->out.common_ops = &exynos_dsi_common_ops;
+	dsi->out.ops.dsi = &exynos_dsi_ops;
+
+	ret = video_source_register(&dsi->out);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register video source\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __devexit exynos_dsi_remove(struct platform_device *pdev)
+{
+	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
+
+	video_source_unregister(&dsi->out);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+/*
+ * Power management
+ */
+
+static int exynos_dsi_runtime_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
+
+	dev_info(dev, "%s\n", __func__);
+
+	if (dsi->pd->phy_enable)
+		dsi->pd->phy_enable(pdev, false);
+
+	clk_disable_unprepare(dsi->pll_clk);
+	clk_disable_unprepare(dsi->bus_clk);
+
+	regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
+
+	return 0;
+}
+
+static int exynos_dsi_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
+
+	dev_info(dev, "%s\n", __func__);
+
+	regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
+
+	clk_prepare_enable(dsi->bus_clk);
+	clk_prepare_enable(dsi->pll_clk);
+
+	if (dsi->pd->phy_enable)
+		dsi->pd->phy_enable(pdev, true);
+
+	return 0;
+}
+
+static int exynos_dsi_suspend(struct device *dev)
+{
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	return exynos_dsi_runtime_suspend(dev);
+}
+
+static int exynos_dsi_resume(struct device *dev)
+{
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	return exynos_dsi_runtime_resume(dev);
+}
+
+static const struct dev_pm_ops exynos_dsi_pm_ops = {
+	SET_RUNTIME_PM_OPS(exynos_dsi_runtime_suspend,
+					exynos_dsi_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(exynos_dsi_suspend, exynos_dsi_resume)
+};
+
+/*
+ * Module
+ */
+
+static struct platform_driver exynos_dsi_driver = {
+	.probe = exynos_dsi_probe,
+	.remove = __devexit_p(exynos_dsi_remove),
+	.driver = {
+		   .name = "exynos-dsi",
+		   .owner = THIS_MODULE,
+		   .pm = &exynos_dsi_pm_ops,
+		   .of_match_table = of_match_ptr(exynos_dsi_of_match),
+	},
+};
+
+module_platform_driver(exynos_dsi_driver);
+
+MODULE_AUTHOR("Tomasz Figa <t.figa@samsung.com>");
+MODULE_DESCRIPTION("Samsung SoC MIPI DSI Master");
+MODULE_LICENSE("GPL");
diff --git a/include/video/exynos_dsi.h b/include/video/exynos_dsi.h
new file mode 100644
index 0000000..95e1568
--- /dev/null
+++ b/include/video/exynos_dsi.h
@@ -0,0 +1,41 @@
+/* include/video/exynos_mipi_dsim.h
+ *
+ * Platform data header for Samsung SoC MIPI-DSIM.
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd
+ *
+ * InKi Dae <inki.dae@samsung.com>
+ * Donghwa Lee <dh09.lee@samsung.com>
+ *
+ * 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.
+*/
+
+#ifndef _EXYNOS_MIPI_DSIM_H
+#define _EXYNOS_MIPI_DSIM_H
+
+#include <linux/device.h>
+
+/*
+ * struct exynos_dsi_platform_data - interface to platform data
+ *	for mipi-dsi driver.
+ *
+ * TODO
+ */
+struct exynos_dsi_platform_data {
+	unsigned int enabled;
+
+	int (*phy_enable)(struct platform_device *pdev, bool on);
+
+	unsigned int pll_stable_time;
+	unsigned long pll_clk_rate;
+	unsigned long esc_clk_rate;
+	unsigned short stop_holding_cnt;
+	unsigned char bta_timeout;
+	unsigned short rx_timeout;
+};
+
+int s5p_dsim_phy_enable(struct platform_device *pdev, bool on);
+
+#endif /* _EXYNOS_MIPI_DSIM_H */
-- 
1.8.1