drm/hisilicon: Add designware dsi encoder driver

Add DesignWare MIPI DSI Host Controller v1.02 encoder driver
for hi6220 SoC.

v9: Fix module compile error.
v8: None.
v7:
- A few regs define clean up.
v6:
- Change "pclk_dsi" to "pclk".
v5: None.
v4: None.
v3:
- Rename file name to dw_drm_dsi.c
- Make encoder type as DRM_MODE_ENCODER_DSI.
- A few cleanup.
v2:
- Remove abtraction layer.
Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
Signed-off-by: Andy Green <andy.green@linaro.org>

drivers/gpu/drm/hisilicon/kirin/Kconfig

@@ -7,3 +7,12 @@ config DRM_HISI_KIRIN
 	help
 	  Choose this option if you have a hisilicon Kirin chipsets(hi6220).
 	  If M is selected the module will be called kirin-drm.
+
+config HISI_KIRIN_DW_DSI
+	tristate "HiSilicon Kirin specific extensions for Synopsys DW MIPI DSI"
+	depends on DRM_HISI_KIRIN
+	select DRM_MIPI_DSI
+	help
+	 This selects support for HiSilicon Kirin SoC specific extensions for
+	 the Synopsys DesignWare DSI driver. If you want to enable MIPI DSI on
+	 hi6220 based SoC, you should selet this option.

drivers/gpu/drm/hisilicon/kirin/Makefile

@@ -2,3 +2,5 @@ kirin-drm-y := kirin_drm_drv.o \
 	       kirin_drm_ade.o
 
 obj-$(CONFIG_DRM_HISI_KIRIN) += kirin-drm.o
+
+obj-$(CONFIG_HISI_KIRIN_DW_DSI) += dw_drm_dsi.o

drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c

+/*
+ * DesignWare MIPI DSI Host Controller v1.02 driver
+ *
+ * Copyright (c) 2016 Linaro Limited.
+ * Copyright (c) 2014-2016 Hisilicon Limited.
+ *
+ * Author:
+ *	Xinliang Liu <z.liuxinliang@hisilicon.com>
+ *	Xinliang Liu <xinliang.liu@linaro.org>
+ *	Xinwei Kong <kong.kongxinwei@hisilicon.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/component.h>
+#include <linux/of_graph.h>
+
+#include <drm/drm_of.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "dw_dsi_reg.h"
+
+#define MAX_TX_ESC_CLK		10
+#define ROUND(x, y)		((x) / (y) + \
+				((x) % (y) * 10 / (y) >= 5 ? 1 : 0))
+#define PHY_REF_CLK_RATE	19200000
+#define PHY_REF_CLK_PERIOD_PS	(1000000000 / (PHY_REF_CLK_RATE / 1000))
+
+#define encoder_to_dsi(encoder) \
+	container_of(encoder, struct dw_dsi, encoder)
+#define host_to_dsi(host) \
+	container_of(host, struct dw_dsi, host)
+
+struct mipi_phy_params {
+	u32 clk_t_lpx;
+	u32 clk_t_hs_prepare;
+	u32 clk_t_hs_zero;
+	u32 clk_t_hs_trial;
+	u32 clk_t_wakeup;
+	u32 data_t_lpx;
+	u32 data_t_hs_prepare;
+	u32 data_t_hs_zero;
+	u32 data_t_hs_trial;
+	u32 data_t_ta_go;
+	u32 data_t_ta_get;
+	u32 data_t_wakeup;
+	u32 hstx_ckg_sel;
+	u32 pll_fbd_div5f;
+	u32 pll_fbd_div1f;
+	u32 pll_fbd_2p;
+	u32 pll_enbwt;
+	u32 pll_fbd_p;
+	u32 pll_fbd_s;
+	u32 pll_pre_div1p;
+	u32 pll_pre_p;
+	u32 pll_vco_750M;
+	u32 pll_lpf_rs;
+	u32 pll_lpf_cs;
+	u32 clklp2hs_time;
+	u32 clkhs2lp_time;
+	u32 lp2hs_time;
+	u32 hs2lp_time;
+	u32 clk_to_data_delay;
+	u32 data_to_clk_delay;
+	u32 lane_byte_clk_kHz;
+	u32 clk_division;
+};
+
+struct dsi_hw_ctx {
+	void __iomem *base;
+	struct clk *pclk;
+};
+
+struct dw_dsi {
+	struct drm_encoder encoder;
+	struct drm_display_mode cur_mode;
+	struct dsi_hw_ctx *ctx;
+	struct mipi_phy_params phy;
+
+	u32 lanes;
+	enum mipi_dsi_pixel_format format;
+	unsigned long mode_flags;
+	bool enable;
+};
+
+struct dsi_data {
+	struct dw_dsi dsi;
+	struct dsi_hw_ctx ctx;
+};
+
+struct dsi_phy_range {
+	u32 min_range_kHz;
+	u32 max_range_kHz;
+	u32 pll_vco_750M;
+	u32 hstx_ckg_sel;
+};
+
+static const struct dsi_phy_range dphy_range_info[] = {
+	{   46875,    62500,   1,    7 },
+	{   62500,    93750,   0,    7 },
+	{   93750,   125000,   1,    6 },
+	{  125000,   187500,   0,    6 },
+	{  187500,   250000,   1,    5 },
+	{  250000,   375000,   0,    5 },
+	{  375000,   500000,   1,    4 },
+	{  500000,   750000,   0,    4 },
+	{  750000,  1000000,   1,    0 },
+	{ 1000000,  1500000,   0,    0 }
+};
+
+static u32 dsi_calc_phy_rate(u32 req_kHz, struct mipi_phy_params *phy)
+{
+	u32 ref_clk_ps = PHY_REF_CLK_PERIOD_PS;
+	u32 tmp_kHz = req_kHz;
+	u32 i = 0;
+	u32 q_pll = 1;
+	u32 m_pll = 0;
+	u32 n_pll = 0;
+	u32 r_pll = 1;
+	u32 m_n = 0;
+	u32 m_n_int = 0;
+	u32 f_kHz = 0;
+	u64 temp;
+
+	/*
+	 * Find a rate >= req_kHz.
+	 */
+	do {
+		f_kHz = tmp_kHz;
+
+		for (i = 0; i < ARRAY_SIZE(dphy_range_info); i++)
+			if (f_kHz >= dphy_range_info[i].min_range_kHz &&
+			    f_kHz <= dphy_range_info[i].max_range_kHz)
+				break;
+
+		if (i == ARRAY_SIZE(dphy_range_info)) {
+			DRM_ERROR("%dkHz out of range\n", f_kHz);
+			return 0;
+		}
+
+		phy->pll_vco_750M = dphy_range_info[i].pll_vco_750M;
+		phy->hstx_ckg_sel = dphy_range_info[i].hstx_ckg_sel;
+
+		if (phy->hstx_ckg_sel <= 7 &&
+		    phy->hstx_ckg_sel >= 4)
+			q_pll = 0x10 >> (7 - phy->hstx_ckg_sel);
+
+		temp = f_kHz * (u64)q_pll * (u64)ref_clk_ps;
+		m_n_int = temp / (u64)1000000000;
+		m_n = (temp % (u64)1000000000) / (u64)100000000;
+
+		if (m_n_int % 2 == 0) {
+			if (m_n * 6 >= 50) {
+				n_pll = 2;
+				m_pll = (m_n_int + 1) * n_pll;
+			} else if (m_n * 6 >= 30) {
+				n_pll = 3;
+				m_pll = m_n_int * n_pll + 2;
+			} else {
+				n_pll = 1;
+				m_pll = m_n_int * n_pll;
+			}
+		} else {
+			if (m_n * 6 >= 50) {
+				n_pll = 1;
+				m_pll = (m_n_int + 1) * n_pll;
+			} else if (m_n * 6 >= 30) {
+				n_pll = 1;
+				m_pll = (m_n_int + 1) * n_pll;
+			} else if (m_n * 6 >= 10) {
+				n_pll = 3;
+				m_pll = m_n_int * n_pll + 1;
+			} else {
+				n_pll = 2;
+				m_pll = m_n_int * n_pll;
+			}
+		}
+
+		if (n_pll == 1) {
+			phy->pll_fbd_p = 0;
+			phy->pll_pre_div1p = 1;
+		} else {
+			phy->pll_fbd_p = n_pll;
+			phy->pll_pre_div1p = 0;
+		}
+
+		if (phy->pll_fbd_2p <= 7 && phy->pll_fbd_2p >= 4)
+			r_pll = 0x10 >> (7 - phy->pll_fbd_2p);
+
+		if (m_pll == 2) {
+			phy->pll_pre_p = 0;
+			phy->pll_fbd_s = 0;
+			phy->pll_fbd_div1f = 0;
+			phy->pll_fbd_div5f = 1;
+		} else if (m_pll >= 2 * 2 * r_pll && m_pll <= 2 * 4 * r_pll) {
+			phy->pll_pre_p = m_pll / (2 * r_pll);
+			phy->pll_fbd_s = 0;
+			phy->pll_fbd_div1f = 1;
+			phy->pll_fbd_div5f = 0;
+		} else if (m_pll >= 2 * 5 * r_pll && m_pll <= 2 * 150 * r_pll) {
+			if (((m_pll / (2 * r_pll)) % 2) == 0) {
+				phy->pll_pre_p =
+					(m_pll / (2 * r_pll)) / 2 - 1;
+				phy->pll_fbd_s =
+					(m_pll / (2 * r_pll)) % 2 + 2;
+			} else {
+				phy->pll_pre_p =
+					(m_pll / (2 * r_pll)) / 2;
+				phy->pll_fbd_s =
+					(m_pll / (2 * r_pll)) % 2;
+			}
+			phy->pll_fbd_div1f = 0;
+			phy->pll_fbd_div5f = 0;
+		} else {
+			phy->pll_pre_p = 0;
+			phy->pll_fbd_s = 0;
+			phy->pll_fbd_div1f = 0;
+			phy->pll_fbd_div5f = 1;
+		}
+
+		f_kHz = (u64)1000000000 * (u64)m_pll /
+			((u64)ref_clk_ps * (u64)n_pll * (u64)q_pll);
+
+		if (f_kHz >= req_kHz)
+			break;
+
+		tmp_kHz += 10;
+
+	} while (true);
+
+	return f_kHz;
+}
+
+static void dsi_get_phy_params(u32 phy_req_kHz,
+			       struct mipi_phy_params *phy)
+{
+	u32 ref_clk_ps = PHY_REF_CLK_PERIOD_PS;
+	u32 phy_rate_kHz;
+	u32 ui;
+
+	memset(phy, 0, sizeof(*phy));
+
+	phy_rate_kHz = dsi_calc_phy_rate(phy_req_kHz, phy);
+	if (!phy_rate_kHz)
+		return;
+
+	ui = 1000000 / phy_rate_kHz;
+
+	phy->clk_t_lpx = ROUND(50, 8 * ui);
+	phy->clk_t_hs_prepare = ROUND(133, 16 * ui) - 1;
+
+	phy->clk_t_hs_zero = ROUND(262, 8 * ui);
+	phy->clk_t_hs_trial = 2 * (ROUND(60, 8 * ui) - 1);
+	phy->clk_t_wakeup = ROUND(1000000, (ref_clk_ps / 1000) - 1);
+	if (phy->clk_t_wakeup > 0xff)
+		phy->clk_t_wakeup = 0xff;
+	phy->data_t_wakeup = phy->clk_t_wakeup;
+	phy->data_t_lpx = phy->clk_t_lpx;
+	phy->data_t_hs_prepare = ROUND(125 + 10 * ui, 16 * ui) - 1;
+	phy->data_t_hs_zero = ROUND(105 + 6 * ui, 8 * ui);
+	phy->data_t_hs_trial = 2 * (ROUND(60 + 4 * ui, 8 * ui) - 1);
+	phy->data_t_ta_go = 3;
+	phy->data_t_ta_get = 4;
+
+	phy->pll_enbwt = 1;
+	phy->clklp2hs_time = ROUND(407, 8 * ui) + 12;
+	phy->clkhs2lp_time = ROUND(105 + 12 * ui, 8 * ui);
+	phy->lp2hs_time = ROUND(240 + 12 * ui, 8 * ui) + 1;
+	phy->hs2lp_time = phy->clkhs2lp_time;
+	phy->clk_to_data_delay = 1 + phy->clklp2hs_time;
+	phy->data_to_clk_delay = ROUND(60 + 52 * ui, 8 * ui) +
+				phy->clkhs2lp_time;
+
+	phy->lane_byte_clk_kHz = phy_rate_kHz / 8;
+	phy->clk_division =
+		DIV_ROUND_UP(phy->lane_byte_clk_kHz, MAX_TX_ESC_CLK);
+}
+
+static u32 dsi_get_dpi_color_coding(enum mipi_dsi_pixel_format format)
+{
+	u32 val;
+
+	/*
+	 * TODO: only support RGB888 now, to support more
+	 */
+	switch (format) {
+	case MIPI_DSI_FMT_RGB888:
+		val = DSI_24BITS_1;
+		break;
+	default:
+		val = DSI_24BITS_1;
+		break;
+	}
+
+	return val;
+}
+
+/*
+ * dsi phy reg write function
+ */
+static void dsi_phy_tst_set(void __iomem *base, u32 reg, u32 val)
+{
+	u32 reg_write = 0x10000 + reg;
+
+	/*
+	 * latch reg first
+	 */
+	writel(reg_write, base + PHY_TST_CTRL1);
+	writel(0x02, base + PHY_TST_CTRL0);
+	writel(0x00, base + PHY_TST_CTRL0);
+
+	/*
+	 * then latch value
+	 */
+	writel(val, base + PHY_TST_CTRL1);
+	writel(0x02, base + PHY_TST_CTRL0);
+	writel(0x00, base + PHY_TST_CTRL0);
+}
+
+static void dsi_set_phy_timer(void __iomem *base,
+			      struct mipi_phy_params *phy,
+			      u32 lanes)
+{
+	u32 val;
+
+	/*
+	 * Set lane value and phy stop wait time.
+	 */
+	val = (lanes - 1) | (PHY_STOP_WAIT_TIME << 8);
+	writel(val, base + PHY_IF_CFG);
+
+	/*
+	 * Set phy clk division.
+	 */
+	val = readl(base + CLKMGR_CFG) | phy->clk_division;
+	writel(val, base + CLKMGR_CFG);
+
+	/*
+	 * Set lp and hs switching params.
+	 */
+	dw_update_bits(base + PHY_TMR_CFG, 24, MASK(8), phy->hs2lp_time);
+	dw_update_bits(base + PHY_TMR_CFG, 16, MASK(8), phy->lp2hs_time);
+	dw_update_bits(base + PHY_TMR_LPCLK_CFG, 16, MASK(10),
+		       phy->clkhs2lp_time);
+	dw_update_bits(base + PHY_TMR_LPCLK_CFG, 0, MASK(10),
+		       phy->clklp2hs_time);
+	dw_update_bits(base + CLK_DATA_TMR_CFG, 8, MASK(8),
+		       phy->data_to_clk_delay);
+	dw_update_bits(base + CLK_DATA_TMR_CFG, 0, MASK(8),
+		       phy->clk_to_data_delay);
+}
+
+static void dsi_set_mipi_phy(void __iomem *base,
+			     struct mipi_phy_params *phy,
+			     u32 lanes)
+{
+	u32 delay_count;
+	u32 val;
+	u32 i;
+
+	/* phy timer setting */
+	dsi_set_phy_timer(base, phy, lanes);
+
+	/*
+	 * Reset to clean up phy tst params.
+	 */
+	writel(0, base + PHY_RSTZ);
+	writel(0, base + PHY_TST_CTRL0);
+	writel(1, base + PHY_TST_CTRL0);
+	writel(0, base + PHY_TST_CTRL0);
+
+	/*
+	 * Clock lane timing control setting: TLPX, THS-PREPARE,
+	 * THS-ZERO, THS-TRAIL, TWAKEUP.
+	 */
+	dsi_phy_tst_set(base, CLK_TLPX, phy->clk_t_lpx);
+	dsi_phy_tst_set(base, CLK_THS_PREPARE, phy->clk_t_hs_prepare);
+	dsi_phy_tst_set(base, CLK_THS_ZERO, phy->clk_t_hs_zero);
+	dsi_phy_tst_set(base, CLK_THS_TRAIL, phy->clk_t_hs_trial);
+	dsi_phy_tst_set(base, CLK_TWAKEUP, phy->clk_t_wakeup);
+
+	/*
+	 * Data lane timing control setting: TLPX, THS-PREPARE,
+	 * THS-ZERO, THS-TRAIL, TTA-GO, TTA-GET, TWAKEUP.
+	 */
+	for (i = 0; i < lanes; i++) {
+		dsi_phy_tst_set(base, DATA_TLPX(i), phy->data_t_lpx);
+		dsi_phy_tst_set(base, DATA_THS_PREPARE(i),
+				phy->data_t_hs_prepare);
+		dsi_phy_tst_set(base, DATA_THS_ZERO(i), phy->data_t_hs_zero);
+		dsi_phy_tst_set(base, DATA_THS_TRAIL(i), phy->data_t_hs_trial);
+		dsi_phy_tst_set(base, DATA_TTA_GO(i), phy->data_t_ta_go);
+		dsi_phy_tst_set(base, DATA_TTA_GET(i), phy->data_t_ta_get);
+		dsi_phy_tst_set(base, DATA_TWAKEUP(i), phy->data_t_wakeup);
+	}
+
+	/*
+	 * physical configuration: I, pll I, pll II, pll III,
+	 * pll IV, pll V.
+	 */
+	dsi_phy_tst_set(base, PHY_CFG_I, phy->hstx_ckg_sel);
+	val = (phy->pll_fbd_div5f << 5) + (phy->pll_fbd_div1f << 4) +
+				(phy->pll_fbd_2p << 1) + phy->pll_enbwt;
+	dsi_phy_tst_set(base, PHY_CFG_PLL_I, val);
+	dsi_phy_tst_set(base, PHY_CFG_PLL_II, phy->pll_fbd_p);
+	dsi_phy_tst_set(base, PHY_CFG_PLL_III, phy->pll_fbd_s);
+	val = (phy->pll_pre_div1p << 7) + phy->pll_pre_p;
+	dsi_phy_tst_set(base, PHY_CFG_PLL_IV, val);
+	val = (5 << 5) + (phy->pll_vco_750M << 4) + (phy->pll_lpf_rs << 2) +
+		phy->pll_lpf_cs;
+	dsi_phy_tst_set(base, PHY_CFG_PLL_V, val);
+
+	writel(PHY_ENABLECLK, base + PHY_RSTZ);
+	udelay(1);
+	writel(PHY_ENABLECLK | PHY_UNSHUTDOWNZ, base + PHY_RSTZ);
+	udelay(1);
+	writel(PHY_ENABLECLK | PHY_UNRSTZ | PHY_UNSHUTDOWNZ, base + PHY_RSTZ);
+	usleep_range(1000, 1500);
+
+	/*
+	 * wait for phy's clock ready
+	 */
+	delay_count = 100;
+	while (delay_count--) {
+		val = readl(base +  PHY_STATUS);
+		if ((BIT(0) | BIT(2)) & val)
+			break;
+
+		udelay(1);
+	}
+
+	if (!delay_count)
+		DRM_INFO("phylock and phystopstateclklane is not ready.\n");
+}
+
+static void dsi_set_mode_timing(void __iomem *base,
+				u32 lane_byte_clk_kHz,
+				struct drm_display_mode *mode,
+				enum mipi_dsi_pixel_format format)
+{
+	u32 hfp, hbp, hsw, vfp, vbp, vsw;
+	u32 hline_time;
+	u32 hsa_time;
+	u32 hbp_time;
+	u32 pixel_clk_kHz;
+	int htot, vtot;
+	u32 val;
+	u64 tmp;
+
+	val = dsi_get_dpi_color_coding(format);
+	writel(val, base + DPI_COLOR_CODING);
+
+	val = (mode->flags & DRM_MODE_FLAG_NHSYNC ? 1 : 0) << 2;
+	val |= (mode->flags & DRM_MODE_FLAG_NVSYNC ? 1 : 0) << 1;
+	writel(val, base +  DPI_CFG_POL);
+
+	/*
+	 * The DSI IP accepts vertical timing using lines as normal,
+	 * but horizontal timing is a mixture of pixel-clocks for the
+	 * active region and byte-lane clocks for the blanking-related
+	 * timings.  hfp is specified as the total hline_time in byte-
+	 * lane clocks minus hsa, hbp and active.
+	 */
+	pixel_clk_kHz = mode->clock;
+	htot = mode->htotal;
+	vtot = mode->vtotal;
+	hfp = mode->hsync_start - mode->hdisplay;
+	hbp = mode->htotal - mode->hsync_end;
+	hsw = mode->hsync_end - mode->hsync_start;
+	vfp = mode->vsync_start - mode->vdisplay;
+	vbp = mode->vtotal - mode->vsync_end;
+	vsw = mode->vsync_end - mode->vsync_start;
+	if (vsw > 15) {
+		DRM_DEBUG_DRIVER("vsw exceeded 15\n");
+		vsw = 15;
+	}
+
+	hsa_time = (hsw * lane_byte_clk_kHz) / pixel_clk_kHz;
+	hbp_time = (hbp * lane_byte_clk_kHz) / pixel_clk_kHz;
+	tmp = (u64)htot * (u64)lane_byte_clk_kHz;
+	hline_time = DIV_ROUND_UP(tmp, pixel_clk_kHz);
+
+	/* all specified in byte-lane clocks */
+	writel(hsa_time, base + VID_HSA_TIME);
+	writel(hbp_time, base + VID_HBP_TIME);
+	writel(hline_time, base + VID_HLINE_TIME);
+
+	writel(vsw, base + VID_VSA_LINES);
+	writel(vbp, base + VID_VBP_LINES);
+	writel(vfp, base + VID_VFP_LINES);
+	writel(mode->vdisplay, base + VID_VACTIVE_LINES);
+	writel(mode->hdisplay, base + VID_PKT_SIZE);
+
+	DRM_DEBUG_DRIVER("htot=%d, hfp=%d, hbp=%d, hsw=%d\n",
+			 htot, hfp, hbp, hsw);
+	DRM_DEBUG_DRIVER("vtol=%d, vfp=%d, vbp=%d, vsw=%d\n",
+			 vtot, vfp, vbp, vsw);
+	DRM_DEBUG_DRIVER("hsa_time=%d, hbp_time=%d, hline_time=%d\n",
+			 hsa_time, hbp_time, hline_time);
+}
+
+static void dsi_set_video_mode(void __iomem *base, unsigned long flags)
+{
+	u32 val;
+	u32 mode_mask = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+		MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+	u32 non_burst_sync_pulse = MIPI_DSI_MODE_VIDEO |
+		MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+	u32 non_burst_sync_event = MIPI_DSI_MODE_VIDEO;
+
+	/*
+	 * choose video mode type
+	 */
+	if ((flags & mode_mask) == non_burst_sync_pulse)
+		val = DSI_NON_BURST_SYNC_PULSES;
+	else if ((flags & mode_mask) == non_burst_sync_event)
+		val = DSI_NON_BURST_SYNC_EVENTS;
+	else
+		val = DSI_BURST_SYNC_PULSES_1;
+	writel(val, base + VID_MODE_CFG);
+
+	writel(PHY_TXREQUESTCLKHS, base + LPCLK_CTRL);
+	writel(DSI_VIDEO_MODE, base + MODE_CFG);
+}
+
+static void dsi_mipi_init(struct dw_dsi *dsi)
+{
+	struct dsi_hw_ctx *ctx = dsi->ctx;
+	struct mipi_phy_params *phy = &dsi->phy;
+	struct drm_display_mode *mode = &dsi->cur_mode;
+	u32 bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
+	void __iomem *base = ctx->base;
+	u32 dphy_req_kHz;
+
+	/*
+	 * count phy params
+	 */
+	dphy_req_kHz = mode->clock * bpp / dsi->lanes;
+	dsi_get_phy_params(dphy_req_kHz, phy);
+
+	/* reset Core */
+	writel(RESET, base + PWR_UP);
+
+	/* set dsi phy params */
+	dsi_set_mipi_phy(base, phy, dsi->lanes);
+
+	/* set dsi mode timing */
+	dsi_set_mode_timing(base, phy->lane_byte_clk_kHz, mode, dsi->format);
+
+	/* set dsi video mode */
+	dsi_set_video_mode(base, dsi->mode_flags);
+
+	/* dsi wake up */
+	writel(POWERUP, base + PWR_UP);
+
+	DRM_DEBUG_DRIVER("lanes=%d, pixel_clk=%d kHz, bytes_freq=%d kHz\n",
+			 dsi->lanes, mode->clock, phy->lane_byte_clk_kHz);
+}
+
+static void dsi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct dw_dsi *dsi = encoder_to_dsi(encoder);
+	struct dsi_hw_ctx *ctx = dsi->ctx;
+	void __iomem *base = ctx->base;
+
+	if (!dsi->enable)
+		return;
+
+	writel(0, base + PWR_UP);
+	writel(0, base + LPCLK_CTRL);
+	writel(0, base + PHY_RSTZ);
+	clk_disable_unprepare(ctx->pclk);
+
+	dsi->enable = false;
+}
+
+static void dsi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct dw_dsi *dsi = encoder_to_dsi(encoder);
+	struct dsi_hw_ctx *ctx = dsi->ctx;
+	int ret;
+
+	if (dsi->enable)
+		return;
+
+	ret = clk_prepare_enable(ctx->pclk);
+	if (ret) {
+		DRM_ERROR("fail to enable pclk: %d\n", ret);
+		return;
+	}
+
+	dsi_mipi_init(dsi);
+
+	dsi->enable = true;
+}
+
+static void dsi_encoder_mode_set(struct drm_encoder *encoder,
+				 struct drm_display_mode *mode,
+				 struct drm_display_mode *adj_mode)
+{
+	struct dw_dsi *dsi = encoder_to_dsi(encoder);
+
+	drm_mode_copy(&dsi->cur_mode, adj_mode);
+}
+
+static int dsi_encoder_atomic_check(struct drm_encoder *encoder,
+				    struct drm_crtc_state *crtc_state,
+				    struct drm_connector_state *conn_state)
+{
+	/* do nothing */
+	return 0;
+}
+
+static const struct drm_encoder_helper_funcs dw_encoder_helper_funcs = {
+	.atomic_check	= dsi_encoder_atomic_check,
+	.mode_set	= dsi_encoder_mode_set,
+	.enable		= dsi_encoder_enable,
+	.disable	= dsi_encoder_disable
+};
+
+static const struct drm_encoder_funcs dw_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int dw_drm_encoder_init(struct device *dev,
+			       struct drm_device *drm_dev,
+			       struct drm_encoder *encoder)
+{
+	int ret;
+	u32 crtc_mask = drm_of_find_possible_crtcs(drm_dev, dev->of_node);
+
+	if (!crtc_mask) {
+		DRM_ERROR("failed to find crtc mask\n");
+		return -EINVAL;
+	}
+
+	encoder->possible_crtcs = crtc_mask;
+	ret = drm_encoder_init(drm_dev, encoder, &dw_encoder_funcs,
+			       DRM_MODE_ENCODER_DSI, NULL);
+	if (ret) {
+		DRM_ERROR("failed to init dsi encoder\n");
+		return ret;
+	}
+
+	drm_encoder_helper_add(encoder, &dw_encoder_helper_funcs);
+
+	return 0;
+}
+
+static int dsi_bind(struct device *dev, struct device *master, void *data)
+{
+	struct dsi_data *ddata = dev_get_drvdata(dev);
+	struct dw_dsi *dsi = &ddata->dsi;
+	struct drm_device *drm_dev = data;
+	int ret;
+
+	ret = dw_drm_encoder_init(dev, drm_dev, &dsi->encoder);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void dsi_unbind(struct device *dev, struct device *master, void *data)
+{
+	/* do nothing */
+}
+
+static const struct component_ops dsi_ops = {
+	.bind	= dsi_bind,
+	.unbind	= dsi_unbind,
+};
+
+static int dsi_parse_dt(struct platform_device *pdev, struct dw_dsi *dsi)
+{
+	struct dsi_hw_ctx *ctx = dsi->ctx;
+	struct resource *res;
+
+	ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
+	if (IS_ERR(ctx->pclk)) {
+		DRM_ERROR("failed to get pclk clock\n");
+		return PTR_ERR(ctx->pclk);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	ctx->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(ctx->base)) {
+		DRM_ERROR("failed to remap dsi io region\n");
+		return PTR_ERR(ctx->base);
+	}
+
+	return 0;
+}
+
+static int dsi_probe(struct platform_device *pdev)
+{
+	struct dsi_data *data;
+	struct dw_dsi *dsi;
+	struct dsi_hw_ctx *ctx;
+	int ret;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		DRM_ERROR("failed to allocate dsi data.\n");
+		return -ENOMEM;
+	}
+	dsi = &data->dsi;
+	ctx = &data->ctx;
+	dsi->ctx = ctx;
+
+	ret = dsi_parse_dt(pdev, dsi);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, data);
+
+	return component_add(&pdev->dev, &dsi_ops);
+}
+
+static int dsi_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &dsi_ops);
+
+	return 0;
+}
+
+static const struct of_device_id dsi_of_match[] = {
+	{.compatible = "hisilicon,hi6220-dsi"},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, dsi_of_match);
+
+static struct platform_driver dsi_driver = {
+	.probe = dsi_probe,
+	.remove = dsi_remove,
+	.driver = {
+		.name = "dw-dsi",
+		.of_match_table = dsi_of_match,
+	},
+};
+
+module_platform_driver(dsi_driver);
+
+MODULE_AUTHOR("Xinliang Liu <xinliang.liu@linaro.org>");
+MODULE_AUTHOR("Xinliang Liu <z.liuxinliang@hisilicon.com>");
+MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
+MODULE_DESCRIPTION("DesignWare MIPI DSI Host Controller v1.02 driver");
+MODULE_LICENSE("GPL v2");

drivers/gpu/drm/hisilicon/kirin/dw_dsi_reg.h

+/*
+ * Copyright (c) 2016 Linaro Limited.
+ * Copyright (c) 2014-2016 Hisilicon Limited.
+ *
+ * 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 __DW_DSI_REG_H__
+#define __DW_DSI_REG_H__
+
+#define MASK(x)				(BIT(x) - 1)
+
+/*
+ * regs
+ */
+#define PWR_UP                  0x04  /* Core power-up */
+#define RESET                   0
+#define POWERUP                 BIT(0)
+#define PHY_IF_CFG              0xA4  /* D-PHY interface configuration */
+#define CLKMGR_CFG              0x08  /* the internal clock dividers */
+#define PHY_RSTZ                0xA0  /* D-PHY reset control */
+#define PHY_ENABLECLK           BIT(2)
+#define PHY_UNRSTZ              BIT(1)
+#define PHY_UNSHUTDOWNZ         BIT(0)
+#define PHY_TST_CTRL0           0xB4  /* D-PHY test interface control 0 */
+#define PHY_TST_CTRL1           0xB8  /* D-PHY test interface control 1 */
+#define CLK_TLPX                0x10
+#define CLK_THS_PREPARE         0x11
+#define CLK_THS_ZERO            0x12
+#define CLK_THS_TRAIL           0x13
+#define CLK_TWAKEUP             0x14
+#define DATA_TLPX(x)            (0x20 + ((x) << 4))
+#define DATA_THS_PREPARE(x)     (0x21 + ((x) << 4))
+#define DATA_THS_ZERO(x)        (0x22 + ((x) << 4))
+#define DATA_THS_TRAIL(x)       (0x23 + ((x) << 4))
+#define DATA_TTA_GO(x)          (0x24 + ((x) << 4))
+#define DATA_TTA_GET(x)         (0x25 + ((x) << 4))
+#define DATA_TWAKEUP(x)         (0x26 + ((x) << 4))
+#define PHY_CFG_I               0x60
+#define PHY_CFG_PLL_I           0x63
+#define PHY_CFG_PLL_II          0x64
+#define PHY_CFG_PLL_III         0x65
+#define PHY_CFG_PLL_IV          0x66
+#define PHY_CFG_PLL_V           0x67
+#define DPI_COLOR_CODING        0x10  /* DPI color coding */
+#define DPI_CFG_POL             0x14  /* DPI polarity configuration */
+#define VID_HSA_TIME            0x48  /* Horizontal Sync Active time */
+#define VID_HBP_TIME            0x4C  /* Horizontal Back Porch time */
+#define VID_HLINE_TIME          0x50  /* Line time */
+#define VID_VSA_LINES           0x54  /* Vertical Sync Active period */
+#define VID_VBP_LINES           0x58  /* Vertical Back Porch period */
+#define VID_VFP_LINES           0x5C  /* Vertical Front Porch period */
+#define VID_VACTIVE_LINES       0x60  /* Vertical resolution */
+#define VID_PKT_SIZE            0x3C  /* Video packet size */
+#define VID_MODE_CFG            0x38  /* Video mode configuration */
+#define PHY_TMR_CFG             0x9C  /* Data lanes timing configuration */
+#define BTA_TO_CNT              0x8C  /* Response timeout definition */
+#define PHY_TMR_LPCLK_CFG       0x98  /* clock lane timing configuration */
+#define CLK_DATA_TMR_CFG        0xCC
+#define LPCLK_CTRL              0x94  /* Low-power in clock lane */
+#define PHY_TXREQUESTCLKHS      BIT(0)
+#define MODE_CFG                0x34  /* Video or Command mode selection */
+#define PHY_STATUS              0xB0  /* D-PHY PPI status interface */
+
+#define	PHY_STOP_WAIT_TIME      0x30
+
+/*
+ * regs relevant enum
+ */
+enum dpi_color_coding {
+	DSI_24BITS_1 = 5,
+};
+
+enum dsi_video_mode_type {
+	DSI_NON_BURST_SYNC_PULSES = 0,
+	DSI_NON_BURST_SYNC_EVENTS,
+	DSI_BURST_SYNC_PULSES_1,
+	DSI_BURST_SYNC_PULSES_2
+};
+
+enum dsi_work_mode {
+	DSI_VIDEO_MODE = 0,
+	DSI_COMMAND_MODE
+};
+
+/*
+ * Register Write/Read Helper functions
+ */
+static inline void dw_update_bits(void __iomem *addr, u32 bit_start,
+				  u32 mask, u32 val)
+{
+	u32 tmp, orig;
+
+	orig = readl(addr);
+	tmp = orig & ~(mask << bit_start);
+	tmp |= (val & mask) << bit_start;
+	writel(tmp, addr);
+}
+
+#endif /* __DW_DRM_DSI_H__ */