drm/sprd: add Unisoc's drm mipi dsi&dphy driver

Adds dsi host controller support for the Unisoc's display subsystem.
Adds dsi phy support for the Unisoc's display subsystem.
Only MIPI DSI Displays supported, DP/TV/HMDI will be support
in the feature.

v1:
  - Remove dphy and dsi graph binding, merge the dphy driver into the dsi.

v2:
  - Use drm_xxx to replace all DRM_XXX.
  - Use kzalloc to replace devm_kzalloc for sprd_dsi structure init.

v4:
  - Use drmm_helpers to allocate encoder.
  - Move allocate encoder and connector to bind function.

v5:
  - Drop the dsi ip file prefix.
  - Fix the checkpatch warnings.
  - Add Signed-off-by for dsi&dphy patch.
  - Use the mode_flags of mipi_dsi_device to setup crtc DPI and EDPI mode.

v6:
  - Redesign the way to access the dsi register.
  - Reduce the dsi_context member variables.

v7:
  - Fix codeing style issue by checkpatch.
  - Drop the pll registers structure define.
  - Use bridge API instead of drm panel API.
  - Register mipi_dsi_host on probe phase;
  - Remove some unused function.

v8:
  - Fix missing signed-off-by.
  - Move component_add to dsi_host.attach callback.

Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211207142717.30296-7-kevin3.tang@gmail.com

drivers/gpu/drm/sprd/Kconfig

@@ -5,6 +5,7 @@ config DRM_SPRD
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_CMA_HELPER
 	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
 	select VIDEOMODE_HELPERS
 	help
 	  Choose this option if you have a Unisoc chipset.

drivers/gpu/drm/sprd/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
-obj-y := sprd_drm.o \
-	sprd_dpu.o
+sprd-drm-y := sprd_drm.o \
+	sprd_dpu.o \
+	sprd_dsi.o \
+	megacores_pll.o
+
+obj-$(CONFIG_DRM_SPRD) += sprd-drm.o
\ No newline at end of file

drivers/gpu/drm/sprd/megacores_pll.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Unisoc Inc.
+ */
+
+#include <asm/div64.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/regmap.h>
+#include <linux/string.h>
+
+#include "sprd_dsi.h"
+
+#define L						0
+#define H						1
+#define CLK						0
+#define DATA					1
+#define INFINITY				0xffffffff
+#define MIN_OUTPUT_FREQ			(100)
+
+#define AVERAGE(a, b) (min(a, b) + abs((b) - (a)) / 2)
+
+/* sharkle */
+#define VCO_BAND_LOW	750
+#define VCO_BAND_MID	1100
+#define VCO_BAND_HIGH	1500
+#define PHY_REF_CLK	26000
+
+static int dphy_calc_pll_param(struct dphy_pll *pll)
+{
+	const u32 khz = 1000;
+	const u32 mhz = 1000000;
+	const unsigned long long factor = 100;
+	unsigned long long tmp;
+	int i;
+
+	pll->potential_fvco = pll->freq / khz;
+	pll->ref_clk = PHY_REF_CLK / khz;
+
+	for (i = 0; i < 4; ++i) {
+		if (pll->potential_fvco >= VCO_BAND_LOW &&
+		    pll->potential_fvco <= VCO_BAND_HIGH) {
+			pll->fvco = pll->potential_fvco;
+			pll->out_sel = BIT(i);
+			break;
+		}
+		pll->potential_fvco <<= 1;
+	}
+	if (pll->fvco == 0)
+		return -EINVAL;
+
+	if (pll->fvco >= VCO_BAND_LOW && pll->fvco <= VCO_BAND_MID) {
+		/* vco band control */
+		pll->vco_band = 0x0;
+		/* low pass filter control */
+		pll->lpf_sel = 1;
+	} else if (pll->fvco > VCO_BAND_MID && pll->fvco <= VCO_BAND_HIGH) {
+		pll->vco_band = 0x1;
+		pll->lpf_sel = 0;
+	} else {
+		return -EINVAL;
+	}
+
+	pll->nint = pll->fvco / pll->ref_clk;
+	tmp = pll->fvco * factor * mhz;
+	do_div(tmp, pll->ref_clk);
+	tmp = tmp - pll->nint * factor * mhz;
+	tmp *= BIT(20);
+	do_div(tmp, 100000000);
+	pll->kint = (u32)tmp;
+	pll->refin = 3; /* pre-divider bypass */
+	pll->sdm_en = true; /* use fraction N PLL */
+	pll->fdk_s = 0x1; /* fraction */
+	pll->cp_s = 0x0;
+	pll->det_delay = 0x1;
+
+	return 0;
+}
+
+static void dphy_set_pll_reg(struct dphy_pll *pll, struct regmap *regmap)
+{
+	u8 reg_val[9] = {0};
+	int i;
+
+	u8 reg_addr[] = {
+		0x03, 0x04, 0x06, 0x08, 0x09,
+		0x0a, 0x0b, 0x0e, 0x0f
+	};
+
+	reg_val[0] = 1 | (1 << 1) |  (pll->lpf_sel << 2);
+	reg_val[1] = pll->div | (1 << 3) | (pll->cp_s << 5) | (pll->fdk_s << 7);
+	reg_val[2] = pll->nint;
+	reg_val[3] = pll->vco_band | (pll->sdm_en << 1) | (pll->refin << 2);
+	reg_val[4] = pll->kint >> 12;
+	reg_val[5] = pll->kint >> 4;
+	reg_val[6] = pll->out_sel | ((pll->kint << 4) & 0xf);
+	reg_val[7] = 1 << 4;
+	reg_val[8] = pll->det_delay;
+
+	for (i = 0; i < sizeof(reg_addr); ++i) {
+		regmap_write(regmap, reg_addr[i], reg_val[i]);
+		DRM_DEBUG("%02x: %02x\n", reg_addr[i], reg_val[i]);
+	}
+}
+
+int dphy_pll_config(struct dsi_context *ctx)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	struct regmap *regmap = ctx->regmap;
+	struct dphy_pll *pll = &ctx->pll;
+	int ret;
+
+	pll->freq = dsi->slave->hs_rate;
+
+	/* FREQ = 26M * (NINT + KINT / 2^20) / out_sel */
+	ret = dphy_calc_pll_param(pll);
+	if (ret) {
+		drm_err(dsi->drm, "failed to calculate dphy pll parameters\n");
+		return ret;
+	}
+	dphy_set_pll_reg(pll, regmap);
+
+	return 0;
+}
+
+static void dphy_set_timing_reg(struct regmap *regmap, int type, u8 val[])
+{
+	switch (type) {
+	case REQUEST_TIME:
+		regmap_write(regmap, 0x31, val[CLK]);
+		regmap_write(regmap, 0x41, val[DATA]);
+		regmap_write(regmap, 0x51, val[DATA]);
+		regmap_write(regmap, 0x61, val[DATA]);
+		regmap_write(regmap, 0x71, val[DATA]);
+
+		regmap_write(regmap, 0x90, val[CLK]);
+		regmap_write(regmap, 0xa0, val[DATA]);
+		regmap_write(regmap, 0xb0, val[DATA]);
+		regmap_write(regmap, 0xc0, val[DATA]);
+		regmap_write(regmap, 0xd0, val[DATA]);
+		break;
+	case PREPARE_TIME:
+		regmap_write(regmap, 0x32, val[CLK]);
+		regmap_write(regmap, 0x42, val[DATA]);
+		regmap_write(regmap, 0x52, val[DATA]);
+		regmap_write(regmap, 0x62, val[DATA]);
+		regmap_write(regmap, 0x72, val[DATA]);
+
+		regmap_write(regmap, 0x91, val[CLK]);
+		regmap_write(regmap, 0xa1, val[DATA]);
+		regmap_write(regmap, 0xb1, val[DATA]);
+		regmap_write(regmap, 0xc1, val[DATA]);
+		regmap_write(regmap, 0xd1, val[DATA]);
+		break;
+	case ZERO_TIME:
+		regmap_write(regmap, 0x33, val[CLK]);
+		regmap_write(regmap, 0x43, val[DATA]);
+		regmap_write(regmap, 0x53, val[DATA]);
+		regmap_write(regmap, 0x63, val[DATA]);
+		regmap_write(regmap, 0x73, val[DATA]);
+
+		regmap_write(regmap, 0x92, val[CLK]);
+		regmap_write(regmap, 0xa2, val[DATA]);
+		regmap_write(regmap, 0xb2, val[DATA]);
+		regmap_write(regmap, 0xc2, val[DATA]);
+		regmap_write(regmap, 0xd2, val[DATA]);
+		break;
+	case TRAIL_TIME:
+		regmap_write(regmap, 0x34, val[CLK]);
+		regmap_write(regmap, 0x44, val[DATA]);
+		regmap_write(regmap, 0x54, val[DATA]);
+		regmap_write(regmap, 0x64, val[DATA]);
+		regmap_write(regmap, 0x74, val[DATA]);
+
+		regmap_write(regmap, 0x93, val[CLK]);
+		regmap_write(regmap, 0xa3, val[DATA]);
+		regmap_write(regmap, 0xb3, val[DATA]);
+		regmap_write(regmap, 0xc3, val[DATA]);
+		regmap_write(regmap, 0xd3, val[DATA]);
+		break;
+	case EXIT_TIME:
+		regmap_write(regmap, 0x36, val[CLK]);
+		regmap_write(regmap, 0x46, val[DATA]);
+		regmap_write(regmap, 0x56, val[DATA]);
+		regmap_write(regmap, 0x66, val[DATA]);
+		regmap_write(regmap, 0x76, val[DATA]);
+
+		regmap_write(regmap, 0x95, val[CLK]);
+		regmap_write(regmap, 0xA5, val[DATA]);
+		regmap_write(regmap, 0xB5, val[DATA]);
+		regmap_write(regmap, 0xc5, val[DATA]);
+		regmap_write(regmap, 0xd5, val[DATA]);
+		break;
+	case CLKPOST_TIME:
+		regmap_write(regmap, 0x35, val[CLK]);
+		regmap_write(regmap, 0x94, val[CLK]);
+		break;
+
+	/* the following just use default value */
+	case SETTLE_TIME:
+		fallthrough;
+	case TA_GET:
+		fallthrough;
+	case TA_GO:
+		fallthrough;
+	case TA_SURE:
+		fallthrough;
+	default:
+		break;
+	}
+}
+
+void dphy_timing_config(struct dsi_context *ctx)
+{
+	struct regmap *regmap = ctx->regmap;
+	struct dphy_pll *pll = &ctx->pll;
+	const u32 factor = 2;
+	const u32 scale = 100;
+	u32 t_ui, t_byteck, t_half_byteck;
+	u32 range[2], constant;
+	u8 val[2];
+	u32 tmp = 0;
+
+	/* t_ui: 1 ui, byteck: 8 ui, half byteck: 4 ui */
+	t_ui = 1000 * scale / (pll->freq / 1000);
+	t_byteck = t_ui << 3;
+	t_half_byteck = t_ui << 2;
+	constant = t_ui << 1;
+
+	/* REQUEST_TIME: HS T-LPX: LP-01
+	 * For T-LPX, mipi spec defined min value is 50ns,
+	 * but maybe it shouldn't be too small, because BTA,
+	 * LP-10, LP-00, LP-01, all of this is related to T-LPX.
+	 */
+	range[L] = 50 * scale;
+	range[H] = INFINITY;
+	val[CLK] = DIV_ROUND_UP(range[L] * (factor << 1), t_byteck) - 2;
+	val[DATA] = val[CLK];
+	dphy_set_timing_reg(regmap, REQUEST_TIME, val);
+
+	/* PREPARE_TIME: HS sequence: LP-00 */
+	range[L] = 38 * scale;
+	range[H] = 95 * scale;
+	tmp = AVERAGE(range[L], range[H]);
+	val[CLK] = DIV_ROUND_UP(AVERAGE(range[L], range[H]), t_half_byteck) - 1;
+	range[L] = 40 * scale + 4 * t_ui;
+	range[H] = 85 * scale + 6 * t_ui;
+	tmp |= AVERAGE(range[L], range[H]) << 16;
+	val[DATA] = DIV_ROUND_UP(AVERAGE(range[L], range[H]), t_half_byteck) - 1;
+	dphy_set_timing_reg(regmap, PREPARE_TIME, val);
+
+	/* ZERO_TIME: HS-ZERO */
+	range[L] = 300 * scale;
+	range[H] = INFINITY;
+	val[CLK] = DIV_ROUND_UP(range[L] * factor + (tmp & 0xffff)
+			- 525 * t_byteck / 100, t_byteck) - 2;
+	range[L] = 145 * scale + 10 * t_ui;
+	val[DATA] = DIV_ROUND_UP(range[L] * factor
+			+ ((tmp >> 16) & 0xffff) - 525 * t_byteck / 100,
+			t_byteck) - 2;
+	dphy_set_timing_reg(regmap, ZERO_TIME, val);
+
+	/* TRAIL_TIME: HS-TRAIL */
+	range[L] = 60 * scale;
+	range[H] = INFINITY;
+	val[CLK] = DIV_ROUND_UP(range[L] * factor - constant, t_half_byteck);
+	range[L] = max(8 * t_ui, 60 * scale + 4 * t_ui);
+	val[DATA] = DIV_ROUND_UP(range[L] * 3 / 2 - constant, t_half_byteck) - 2;
+	dphy_set_timing_reg(regmap, TRAIL_TIME, val);
+
+	/* EXIT_TIME: */
+	range[L] = 100 * scale;
+	range[H] = INFINITY;
+	val[CLK] = DIV_ROUND_UP(range[L] * factor, t_byteck) - 2;
+	val[DATA] = val[CLK];
+	dphy_set_timing_reg(regmap, EXIT_TIME, val);
+
+	/* CLKPOST_TIME: */
+	range[L] = 60 * scale + 52 * t_ui;
+	range[H] = INFINITY;
+	val[CLK] = DIV_ROUND_UP(range[L] * factor, t_byteck) - 2;
+	val[DATA] = val[CLK];
+	dphy_set_timing_reg(regmap, CLKPOST_TIME, val);
+
+	/* SETTLE_TIME:
+	 * This time is used for receiver. So for transmitter,
+	 * it can be ignored.
+	 */
+
+	/* TA_GO:
+	 * transmitter drives bridge state(LP-00) before releasing control,
+	 * reg 0x1f default value: 0x04, which is good.
+	 */
+
+	/* TA_SURE:
+	 * After LP-10 state and before bridge state(LP-00),
+	 * reg 0x20 default value: 0x01, which is good.
+	 */
+
+	/* TA_GET:
+	 * receiver drives Bridge state(LP-00) before releasing control
+	 * reg 0x21 default value: 0x03, which is good.
+	 */
+}

drivers/gpu/drm/sprd/sprd_dpu.c

@@ -25,6 +25,7 @@
 
 #include "sprd_drm.h"
 #include "sprd_dpu.h"
+#include "sprd_dsi.h"
 
 /* Global control registers */
 #define REG_DPU_CTRL	0x04
@@ -618,9 +619,21 @@ static void sprd_crtc_mode_set_nofb(struct drm_crtc *crtc)
 {
 	struct sprd_dpu *dpu = to_sprd_crtc(crtc);
 	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+	struct drm_encoder *encoder;
+	struct sprd_dsi *dsi;
 
 	drm_display_mode_to_videomode(mode, &dpu->ctx.vm);
 
+	drm_for_each_encoder_mask(encoder, crtc->dev,
+				  crtc->state->encoder_mask) {
+		dsi = encoder_to_dsi(encoder);
+
+		if (dsi->slave->mode_flags & MIPI_DSI_MODE_VIDEO)
+			dpu->ctx.if_type = SPRD_DPU_IF_DPI;
+		else
+			dpu->ctx.if_type = SPRD_DPU_IF_EDPI;
+	}
+
 	sprd_dpi_init(dpu);
 }
 

drivers/gpu/drm/sprd/sprd_drm.c

@@ -181,6 +181,7 @@ static struct platform_driver sprd_drm_driver = {
 static struct platform_driver *sprd_drm_drivers[]  = {
 	&sprd_drm_driver,
 	&sprd_dpu_driver,
+	&sprd_dsi_driver,
 };
 
 static int __init sprd_drm_init(void)

drivers/gpu/drm/sprd/sprd_drm.h

@@ -14,5 +14,6 @@ struct sprd_drm {
 };
 
 extern struct platform_driver sprd_dpu_driver;
+extern struct platform_driver sprd_dsi_driver;
 
 #endif /* _SPRD_DRM_H_ */

drivers/gpu/drm/sprd/sprd_dsi.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Unisoc Inc.
+ */
+
+#include <linux/component.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_graph.h>
+#include <video/mipi_display.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+
+#include "sprd_drm.h"
+#include "sprd_dpu.h"
+#include "sprd_dsi.h"
+
+#define SOFT_RESET 0x04
+#define MASK_PROTOCOL_INT 0x0C
+#define MASK_INTERNAL_INT 0x14
+#define DSI_MODE_CFG 0x18
+
+#define VIRTUAL_CHANNEL_ID 0x1C
+#define GEN_RX_VCID GENMASK(1, 0)
+#define VIDEO_PKT_VCID GENMASK(3, 2)
+
+#define DPI_VIDEO_FORMAT 0x20
+#define DPI_VIDEO_MODE_FORMAT GENMASK(5, 0)
+#define LOOSELY18_EN BIT(6)
+
+#define VIDEO_PKT_CONFIG 0x24
+#define VIDEO_PKT_SIZE GENMASK(15, 0)
+#define VIDEO_LINE_CHUNK_NUM GENMASK(31, 16)
+
+#define VIDEO_LINE_HBLK_TIME 0x28
+#define VIDEO_LINE_HBP_TIME GENMASK(15, 0)
+#define VIDEO_LINE_HSA_TIME GENMASK(31, 16)
+
+#define VIDEO_LINE_TIME 0x2C
+
+#define VIDEO_VBLK_LINES 0x30
+#define VFP_LINES GENMASK(9, 0)
+#define VBP_LINES GENMASK(19, 10)
+#define VSA_LINES GENMASK(29, 20)
+
+#define VIDEO_VACTIVE_LINES 0x34
+
+#define VID_MODE_CFG 0x38
+#define VID_MODE_TYPE GENMASK(1, 0)
+#define LP_VSA_EN BIT(8)
+#define LP_VBP_EN BIT(9)
+#define LP_VFP_EN BIT(10)
+#define LP_VACT_EN BIT(11)
+#define LP_HBP_EN BIT(12)
+#define LP_HFP_EN BIT(13)
+#define FRAME_BTA_ACK_EN BIT(14)
+
+#define TIMEOUT_CNT_CLK_CONFIG 0x40
+#define HTX_TO_CONFIG 0x44
+#define LRX_H_TO_CONFIG 0x48
+
+#define TX_ESC_CLK_CONFIG 0x5C
+
+#define CMD_MODE_CFG 0x68
+#define TEAR_FX_EN BIT(0)
+
+#define GEN_HDR 0x6C
+#define GEN_DT GENMASK(5, 0)
+#define GEN_VC GENMASK(7, 6)
+
+#define GEN_PLD_DATA 0x70
+
+#define PHY_CLK_LANE_LP_CTRL 0x74
+#define PHY_CLKLANE_TX_REQ_HS BIT(0)
+#define AUTO_CLKLANE_CTRL_EN BIT(1)
+
+#define PHY_INTERFACE_CTRL 0x78
+#define RF_PHY_SHUTDOWN BIT(0)
+#define RF_PHY_RESET_N BIT(1)
+#define RF_PHY_CLK_EN BIT(2)
+
+#define CMD_MODE_STATUS 0x98
+#define GEN_CMD_RDATA_FIFO_EMPTY BIT(1)
+#define GEN_CMD_WDATA_FIFO_EMPTY BIT(3)
+#define GEN_CMD_CMD_FIFO_EMPTY BIT(5)
+#define GEN_CMD_RDCMD_DONE BIT(7)
+
+#define PHY_STATUS 0x9C
+#define PHY_LOCK BIT(1)
+
+#define PHY_MIN_STOP_TIME 0xA0
+#define PHY_LANE_NUM_CONFIG 0xA4
+
+#define PHY_CLKLANE_TIME_CONFIG 0xA8
+#define PHY_CLKLANE_LP_TO_HS_TIME GENMASK(15, 0)
+#define PHY_CLKLANE_HS_TO_LP_TIME GENMASK(31, 16)
+
+#define PHY_DATALANE_TIME_CONFIG 0xAC
+#define PHY_DATALANE_LP_TO_HS_TIME GENMASK(15, 0)
+#define PHY_DATALANE_HS_TO_LP_TIME GENMASK(31, 16)
+
+#define MAX_READ_TIME 0xB0
+
+#define RX_PKT_CHECK_CONFIG 0xB4
+#define RX_PKT_ECC_EN BIT(0)
+#define RX_PKT_CRC_EN BIT(1)
+
+#define TA_EN 0xB8
+
+#define EOTP_EN 0xBC
+#define TX_EOTP_EN BIT(0)
+#define RX_EOTP_EN BIT(1)
+
+#define VIDEO_NULLPKT_SIZE 0xC0
+#define DCS_WM_PKT_SIZE 0xC4
+
+#define VIDEO_SIG_DELAY_CONFIG 0xD0
+#define VIDEO_SIG_DELAY GENMASK(23, 0)
+
+#define PHY_TST_CTRL0 0xF0
+#define PHY_TESTCLR BIT(0)
+#define PHY_TESTCLK BIT(1)
+
+#define PHY_TST_CTRL1 0xF4
+#define PHY_TESTDIN GENMASK(7, 0)
+#define PHY_TESTDOUT GENMASK(15, 8)
+#define PHY_TESTEN BIT(16)
+
+#define host_to_dsi(host) \
+	container_of(host, struct sprd_dsi, host)
+
+static inline u32
+dsi_reg_rd(struct dsi_context *ctx, u32 offset, u32 mask,
+	   u32 shift)
+{
+	return (readl(ctx->base + offset) & mask) >> shift;
+}
+
+static inline void
+dsi_reg_wr(struct dsi_context *ctx, u32 offset, u32 mask,
+	   u32 shift, u32 val)
+{
+	u32 ret;
+
+	ret = readl(ctx->base + offset);
+	ret &= ~mask;
+	ret |= (val << shift) & mask;
+	writel(ret, ctx->base + offset);
+}
+
+static inline void
+dsi_reg_up(struct dsi_context *ctx, u32 offset, u32 mask,
+	   u32 val)
+{
+	u32 ret = readl(ctx->base + offset);
+
+	writel((ret & ~mask) | (val & mask), ctx->base + offset);
+}
+
+static int regmap_tst_io_write(void *context, u32 reg, u32 val)
+{
+	struct sprd_dsi *dsi = context;
+	struct dsi_context *ctx = &dsi->ctx;
+
+	if (val > 0xff || reg > 0xff)
+		return -EINVAL;
+
+	drm_dbg(dsi->drm, "reg = 0x%02x, val = 0x%02x\n", reg, val);
+
+	dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, PHY_TESTEN);
+	dsi_reg_wr(ctx, PHY_TST_CTRL1, PHY_TESTDIN, 0, reg);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, PHY_TESTCLK);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, 0);
+	dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, 0);
+	dsi_reg_wr(ctx, PHY_TST_CTRL1, PHY_TESTDIN, 0, val);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, PHY_TESTCLK);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, 0);
+
+	return 0;
+}
+
+static int regmap_tst_io_read(void *context, u32 reg, u32 *val)
+{
+	struct sprd_dsi *dsi = context;
+	struct dsi_context *ctx = &dsi->ctx;
+	int ret;
+
+	if (reg > 0xff)
+		return -EINVAL;
+
+	dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, PHY_TESTEN);
+	dsi_reg_wr(ctx, PHY_TST_CTRL1, PHY_TESTDIN, 0, reg);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, PHY_TESTCLK);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLK, 0);
+	dsi_reg_up(ctx, PHY_TST_CTRL1, PHY_TESTEN, 0);
+
+	udelay(1);
+
+	ret = dsi_reg_rd(ctx, PHY_TST_CTRL1, PHY_TESTDOUT, 8);
+	if (ret < 0)
+		return ret;
+
+	*val = ret;
+
+	drm_dbg(dsi->drm, "reg = 0x%02x, val = 0x%02x\n", reg, *val);
+	return 0;
+}
+
+static struct regmap_bus regmap_tst_io = {
+	.reg_write = regmap_tst_io_write,
+	.reg_read = regmap_tst_io_read,
+};
+
+static const struct regmap_config byte_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int dphy_wait_pll_locked(struct dsi_context *ctx)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	int i;
+
+	for (i = 0; i < 50000; i++) {
+		if (dsi_reg_rd(ctx, PHY_STATUS, PHY_LOCK, 1))
+			return 0;
+		udelay(3);
+	}
+
+	drm_err(dsi->drm, "dphy pll can not be locked\n");
+	return -ETIMEDOUT;
+}
+
+static int dsi_wait_tx_payload_fifo_empty(struct dsi_context *ctx)
+{
+	int i;
+
+	for (i = 0; i < 5000; i++) {
+		if (dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_WDATA_FIFO_EMPTY, 3))
+			return 0;
+		udelay(1);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int dsi_wait_tx_cmd_fifo_empty(struct dsi_context *ctx)
+{
+	int i;
+
+	for (i = 0; i < 5000; i++) {
+		if (dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_CMD_FIFO_EMPTY, 5))
+			return 0;
+		udelay(1);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int dsi_wait_rd_resp_completed(struct dsi_context *ctx)
+{
+	int i;
+
+	for (i = 0; i < 10000; i++) {
+		if (dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_RDCMD_DONE, 7))
+			return 0;
+		udelay(10);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static u16 calc_bytes_per_pixel_x100(int coding)
+{
+	u16 bpp_x100;
+
+	switch (coding) {
+	case COLOR_CODE_16BIT_CONFIG1:
+	case COLOR_CODE_16BIT_CONFIG2:
+	case COLOR_CODE_16BIT_CONFIG3:
+		bpp_x100 = 200;
+		break;
+	case COLOR_CODE_18BIT_CONFIG1:
+	case COLOR_CODE_18BIT_CONFIG2:
+		bpp_x100 = 225;
+		break;
+	case COLOR_CODE_24BIT:
+		bpp_x100 = 300;
+		break;
+	case COLOR_CODE_COMPRESSTION:
+		bpp_x100 = 100;
+		break;
+	case COLOR_CODE_20BIT_YCC422_LOOSELY:
+		bpp_x100 = 250;
+		break;
+	case COLOR_CODE_24BIT_YCC422:
+		bpp_x100 = 300;
+		break;
+	case COLOR_CODE_16BIT_YCC422:
+		bpp_x100 = 200;
+		break;
+	case COLOR_CODE_30BIT:
+		bpp_x100 = 375;
+		break;
+	case COLOR_CODE_36BIT:
+		bpp_x100 = 450;
+		break;
+	case COLOR_CODE_12BIT_YCC420:
+		bpp_x100 = 150;
+		break;
+	default:
+		DRM_ERROR("invalid color coding");
+		bpp_x100 = 0;
+		break;
+	}
+
+	return bpp_x100;
+}
+
+static u8 calc_video_size_step(int coding)
+{
+	u8 video_size_step;
+
+	switch (coding) {
+	case COLOR_CODE_16BIT_CONFIG1:
+	case COLOR_CODE_16BIT_CONFIG2:
+	case COLOR_CODE_16BIT_CONFIG3:
+	case COLOR_CODE_18BIT_CONFIG1:
+	case COLOR_CODE_18BIT_CONFIG2:
+	case COLOR_CODE_24BIT:
+	case COLOR_CODE_COMPRESSTION:
+		return video_size_step = 1;
+	case COLOR_CODE_20BIT_YCC422_LOOSELY:
+	case COLOR_CODE_24BIT_YCC422:
+	case COLOR_CODE_16BIT_YCC422:
+	case COLOR_CODE_30BIT:
+	case COLOR_CODE_36BIT:
+	case COLOR_CODE_12BIT_YCC420:
+		return video_size_step = 2;
+	default:
+		DRM_ERROR("invalid color coding");
+		return 0;
+	}
+}
+
+static u16 round_video_size(int coding, u16 video_size)
+{
+	switch (coding) {
+	case COLOR_CODE_16BIT_YCC422:
+	case COLOR_CODE_24BIT_YCC422:
+	case COLOR_CODE_20BIT_YCC422_LOOSELY:
+	case COLOR_CODE_12BIT_YCC420:
+		/* round up active H pixels to a multiple of 2 */
+		if ((video_size % 2) != 0)
+			video_size += 1;
+		break;
+	default:
+		break;
+	}
+
+	return video_size;
+}
+
+#define SPRD_MIPI_DSI_FMT_DSC 0xff
+static u32 fmt_to_coding(u32 fmt)
+{
+	switch (fmt) {
+	case MIPI_DSI_FMT_RGB565:
+		return COLOR_CODE_16BIT_CONFIG1;
+	case MIPI_DSI_FMT_RGB666:
+	case MIPI_DSI_FMT_RGB666_PACKED:
+		return COLOR_CODE_18BIT_CONFIG1;
+	case MIPI_DSI_FMT_RGB888:
+		return COLOR_CODE_24BIT;
+	case SPRD_MIPI_DSI_FMT_DSC:
+		return COLOR_CODE_COMPRESSTION;
+	default:
+		DRM_ERROR("Unsupported format (%d)\n", fmt);
+		return COLOR_CODE_24BIT;
+	}
+}
+
+#define ns_to_cycle(ns, byte_clk) \
+	DIV_ROUND_UP((ns) * (byte_clk), 1000000)
+
+static void sprd_dsi_init(struct dsi_context *ctx)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	u32 byte_clk = dsi->slave->hs_rate / 8;
+	u16 data_hs2lp, data_lp2hs, clk_hs2lp, clk_lp2hs;
+	u16 max_rd_time;
+	int div;
+
+	writel(0, ctx->base + SOFT_RESET);
+	writel(0xffffffff, ctx->base + MASK_PROTOCOL_INT);
+	writel(0xffffffff, ctx->base + MASK_INTERNAL_INT);
+	writel(1, ctx->base + DSI_MODE_CFG);
+	dsi_reg_up(ctx, EOTP_EN, RX_EOTP_EN, 0);
+	dsi_reg_up(ctx, EOTP_EN, TX_EOTP_EN, 0);
+	dsi_reg_up(ctx, RX_PKT_CHECK_CONFIG, RX_PKT_ECC_EN, RX_PKT_ECC_EN);
+	dsi_reg_up(ctx, RX_PKT_CHECK_CONFIG, RX_PKT_CRC_EN, RX_PKT_CRC_EN);
+	writel(1, ctx->base + TA_EN);
+	dsi_reg_up(ctx, VIRTUAL_CHANNEL_ID, VIDEO_PKT_VCID, 0);
+	dsi_reg_up(ctx, VIRTUAL_CHANNEL_ID, GEN_RX_VCID, 0);
+
+	div = DIV_ROUND_UP(byte_clk, dsi->slave->lp_rate);
+	writel(div, ctx->base + TX_ESC_CLK_CONFIG);
+
+	max_rd_time = ns_to_cycle(ctx->max_rd_time, byte_clk);
+	writel(max_rd_time, ctx->base + MAX_READ_TIME);
+
+	data_hs2lp = ns_to_cycle(ctx->data_hs2lp, byte_clk);
+	data_lp2hs = ns_to_cycle(ctx->data_lp2hs, byte_clk);
+	clk_hs2lp = ns_to_cycle(ctx->clk_hs2lp, byte_clk);
+	clk_lp2hs = ns_to_cycle(ctx->clk_lp2hs, byte_clk);
+	dsi_reg_wr(ctx, PHY_DATALANE_TIME_CONFIG,
+		   PHY_DATALANE_HS_TO_LP_TIME, 16, data_hs2lp);
+	dsi_reg_wr(ctx, PHY_DATALANE_TIME_CONFIG,
+		   PHY_DATALANE_LP_TO_HS_TIME, 0, data_lp2hs);
+	dsi_reg_wr(ctx, PHY_CLKLANE_TIME_CONFIG,
+		   PHY_CLKLANE_HS_TO_LP_TIME, 16, clk_hs2lp);
+	dsi_reg_wr(ctx, PHY_CLKLANE_TIME_CONFIG,
+		   PHY_CLKLANE_LP_TO_HS_TIME, 0, clk_lp2hs);
+
+	writel(1, ctx->base + SOFT_RESET);
+}
+
+/*
+ * Free up resources and shutdown host controller and PHY
+ */
+static void sprd_dsi_fini(struct dsi_context *ctx)
+{
+	writel(0xffffffff, ctx->base + MASK_PROTOCOL_INT);
+	writel(0xffffffff, ctx->base + MASK_INTERNAL_INT);
+	writel(0, ctx->base + SOFT_RESET);
+}
+
+/*
+ * If not in burst mode, it will compute the video and null packet sizes
+ * according to necessity.
+ * Configure timers for data lanes and/or clock lane to return to LP when
+ * bandwidth is not filled by data.
+ */
+static int sprd_dsi_dpi_video(struct dsi_context *ctx)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	struct videomode *vm = &ctx->vm;
+	u32 byte_clk = dsi->slave->hs_rate / 8;
+	u16 bpp_x100;
+	u16 video_size;
+	u32 ratio_x1000;
+	u16 null_pkt_size = 0;
+	u8 video_size_step;
+	u32 hs_to;
+	u32 total_bytes;
+	u32 bytes_per_chunk;
+	u32 chunks = 0;
+	u32 bytes_left = 0;
+	u32 chunk_overhead;
+	const u8 pkt_header = 6;
+	u8 coding;
+	int div;
+	u16 hline;
+	u16 byte_cycle;
+
+	coding = fmt_to_coding(dsi->slave->format);
+	video_size = round_video_size(coding, vm->hactive);
+	bpp_x100 = calc_bytes_per_pixel_x100(coding);
+	video_size_step = calc_video_size_step(coding);
+	ratio_x1000 = byte_clk * 1000 / (vm->pixelclock / 1000);
+	hline = vm->hactive + vm->hsync_len + vm->hfront_porch +
+		vm->hback_porch;
+
+	writel(0, ctx->base + SOFT_RESET);
+	dsi_reg_wr(ctx, VID_MODE_CFG, FRAME_BTA_ACK_EN, 15, ctx->frame_ack_en);
+	dsi_reg_wr(ctx, DPI_VIDEO_FORMAT, DPI_VIDEO_MODE_FORMAT, 0, coding);
+	dsi_reg_wr(ctx, VID_MODE_CFG, VID_MODE_TYPE, 0, ctx->burst_mode);
+	byte_cycle = 95 * hline * ratio_x1000 / 100000;
+	dsi_reg_wr(ctx, VIDEO_SIG_DELAY_CONFIG, VIDEO_SIG_DELAY, 0, byte_cycle);
+	byte_cycle = hline * ratio_x1000 / 1000;
+	writel(byte_cycle, ctx->base + VIDEO_LINE_TIME);
+	byte_cycle = vm->hsync_len * ratio_x1000 / 1000;
+	dsi_reg_wr(ctx, VIDEO_LINE_HBLK_TIME, VIDEO_LINE_HSA_TIME, 16, byte_cycle);
+	byte_cycle = vm->hback_porch * ratio_x1000 / 1000;
+	dsi_reg_wr(ctx, VIDEO_LINE_HBLK_TIME, VIDEO_LINE_HBP_TIME, 0, byte_cycle);
+	writel(vm->vactive, ctx->base + VIDEO_VACTIVE_LINES);
+	dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VFP_LINES, 0, vm->vfront_porch);
+	dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VBP_LINES, 10, vm->vback_porch);
+	dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VSA_LINES, 20, vm->vsync_len);
+	dsi_reg_up(ctx, VID_MODE_CFG, LP_HBP_EN | LP_HFP_EN | LP_VACT_EN |
+			LP_VFP_EN | LP_VBP_EN | LP_VSA_EN, LP_HBP_EN | LP_HFP_EN |
+			LP_VACT_EN | LP_VFP_EN | LP_VBP_EN | LP_VSA_EN);
+
+	hs_to = (hline * vm->vactive) + (2 * bpp_x100) / 100;
+	for (div = 0x80; (div < hs_to) && (div > 2); div--) {
+		if ((hs_to % div) == 0) {
+			writel(div, ctx->base + TIMEOUT_CNT_CLK_CONFIG);
+			writel(hs_to / div, ctx->base + LRX_H_TO_CONFIG);
+			writel(hs_to / div, ctx->base + HTX_TO_CONFIG);
+			break;
+		}
+	}
+
+	if (ctx->burst_mode == VIDEO_BURST_WITH_SYNC_PULSES) {
+		dsi_reg_wr(ctx, VIDEO_PKT_CONFIG, VIDEO_PKT_SIZE, 0, video_size);
+		writel(0, ctx->base + VIDEO_NULLPKT_SIZE);
+		dsi_reg_up(ctx, VIDEO_PKT_CONFIG, VIDEO_LINE_CHUNK_NUM, 0);
+	} else {
+		/* non burst transmission */
+		null_pkt_size = 0;
+
+		/* bytes to be sent - first as one chunk */
+		bytes_per_chunk = vm->hactive * bpp_x100 / 100 + pkt_header;
+
+		/* hline total bytes from the DPI interface */
+		total_bytes = (vm->hactive + vm->hfront_porch) *
+				ratio_x1000 / dsi->slave->lanes / 1000;
+
+		/* check if the pixels actually fit on the DSI link */
+		if (total_bytes < bytes_per_chunk) {
+			drm_err(dsi->drm, "current resolution can not be set\n");
+			return -EINVAL;
+		}
+
+		chunk_overhead = total_bytes - bytes_per_chunk;
+
+		/* overhead higher than 1 -> enable multi packets */
+		if (chunk_overhead > 1) {
+			/* multi packets */
+			for (video_size = video_size_step;
+			     video_size < vm->hactive;
+			     video_size += video_size_step) {
+				if (vm->hactive * 1000 / video_size % 1000)
+					continue;
+
+				chunks = vm->hactive / video_size;
+				bytes_per_chunk = bpp_x100 * video_size / 100
+						  + pkt_header;
+				if (total_bytes >= (bytes_per_chunk * chunks)) {
+					bytes_left = total_bytes -
+						     bytes_per_chunk * chunks;
+					break;
+				}
+			}
+
+			/* prevent overflow (unsigned - unsigned) */
+			if (bytes_left > (pkt_header * chunks)) {
+				null_pkt_size = (bytes_left -
+						pkt_header * chunks) / chunks;
+				/* avoid register overflow */
+				if (null_pkt_size > 1023)
+					null_pkt_size = 1023;
+			}
+
+		} else {
+			/* single packet */
+			chunks = 1;
+
+			/* must be a multiple of 4 except 18 loosely */
+			for (video_size = vm->hactive;
+			    (video_size % video_size_step) != 0;
+			     video_size++)
+				;
+		}
+
+		dsi_reg_wr(ctx, VIDEO_PKT_CONFIG, VIDEO_PKT_SIZE, 0, video_size);
+		writel(null_pkt_size, ctx->base + VIDEO_NULLPKT_SIZE);
+		dsi_reg_wr(ctx, VIDEO_PKT_CONFIG, VIDEO_LINE_CHUNK_NUM, 16, chunks);
+	}
+
+	writel(ctx->int0_mask, ctx->base + MASK_PROTOCOL_INT);
+	writel(ctx->int1_mask, ctx->base + MASK_INTERNAL_INT);
+	writel(1, ctx->base + SOFT_RESET);
+
+	return 0;
+}
+
+static void sprd_dsi_edpi_video(struct dsi_context *ctx)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	const u32 fifo_depth = 1096;
+	const u32 word_length = 4;
+	u32 hactive = ctx->vm.hactive;
+	u32 bpp_x100;
+	u32 max_fifo_len;
+	u8 coding;
+
+	coding = fmt_to_coding(dsi->slave->format);
+	bpp_x100 = calc_bytes_per_pixel_x100(coding);
+	max_fifo_len = word_length * fifo_depth * 100 / bpp_x100;
+
+	writel(0, ctx->base + SOFT_RESET);
+	dsi_reg_wr(ctx, DPI_VIDEO_FORMAT, DPI_VIDEO_MODE_FORMAT, 0, coding);
+	dsi_reg_wr(ctx, CMD_MODE_CFG, TEAR_FX_EN, 0, ctx->te_ack_en);
+
+	if (max_fifo_len > hactive)
+		writel(hactive, ctx->base + DCS_WM_PKT_SIZE);
+	else
+		writel(max_fifo_len, ctx->base + DCS_WM_PKT_SIZE);
+
+	writel(ctx->int0_mask, ctx->base + MASK_PROTOCOL_INT);
+	writel(ctx->int1_mask, ctx->base + MASK_INTERNAL_INT);
+	writel(1, ctx->base + SOFT_RESET);
+}
+
+/*
+ * Send a packet on the generic interface,
+ * this function has an active delay to wait for the buffer to clear.
+ * The delay is limited to:
+ * (param_length / 4) x DSIH_FIFO_ACTIVE_WAIT x register access time
+ * the controller restricts the sending of.
+ *
+ * This function will not be able to send Null and Blanking packets due to
+ * controller restriction
+ */
+static int sprd_dsi_wr_pkt(struct dsi_context *ctx, u8 vc, u8 type,
+			   const u8 *param, u16 len)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	u8 wc_lsbyte, wc_msbyte;
+	u32 payload;
+	int i, j, ret;
+
+	if (vc > 3)
+		return -EINVAL;
+
+	/* 1st: for long packet, must config payload first */
+	ret = dsi_wait_tx_payload_fifo_empty(ctx);
+	if (ret) {
+		drm_err(dsi->drm, "tx payload fifo is not empty\n");
+		return ret;
+	}
+
+	if (len > 2) {
+		for (i = 0, j = 0; i < len; i += j) {
+			payload = 0;
+			for (j = 0; (j < 4) && ((j + i) < (len)); j++)
+				payload |= param[i + j] << (j * 8);
+
+			writel(payload, ctx->base + GEN_PLD_DATA);
+		}
+		wc_lsbyte = len & 0xff;
+		wc_msbyte = len >> 8;
+	} else {
+		wc_lsbyte = (len > 0) ? param[0] : 0;
+		wc_msbyte = (len > 1) ? param[1] : 0;
+	}
+
+	/* 2nd: then set packet header */
+	ret = dsi_wait_tx_cmd_fifo_empty(ctx);
+	if (ret) {
+		drm_err(dsi->drm, "tx cmd fifo is not empty\n");
+		return ret;
+	}
+
+	writel(type | (vc << 6) | (wc_lsbyte << 8) | (wc_msbyte << 16),
+	       ctx->base + GEN_HDR);
+
+	return 0;
+}
+
+/*
+ * Send READ packet to peripheral using the generic interface,
+ * this will force command mode and stop video mode (because of BTA).
+ *
+ * This function has an active delay to wait for the buffer to clear,
+ * the delay is limited to 2 x DSIH_FIFO_ACTIVE_WAIT
+ * (waiting for command buffer, and waiting for receiving)
+ * @note this function will enable BTA
+ */
+static int sprd_dsi_rd_pkt(struct dsi_context *ctx, u8 vc, u8 type,
+			   u8 msb_byte, u8 lsb_byte,
+			   u8 *buffer, u8 bytes_to_read)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	int i, ret;
+	int count = 0;
+	u32 temp;
+
+	if (vc > 3)
+		return -EINVAL;
+
+	/* 1st: send read command to peripheral */
+	ret = dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_CMD_FIFO_EMPTY, 5);
+	if (!ret)
+		return -EIO;
+
+	writel(type | (vc << 6) | (lsb_byte << 8) | (msb_byte << 16),
+	       ctx->base + GEN_HDR);
+
+	/* 2nd: wait peripheral response completed */
+	ret = dsi_wait_rd_resp_completed(ctx);
+	if (ret) {
+		drm_err(dsi->drm, "wait read response time out\n");
+		return ret;
+	}
+
+	/* 3rd: get data from rx payload fifo */
+	ret = dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_RDATA_FIFO_EMPTY, 1);
+	if (ret) {
+		drm_err(dsi->drm, "rx payload fifo empty\n");
+		return -EIO;
+	}
+
+	for (i = 0; i < 100; i++) {
+		temp = readl(ctx->base + GEN_PLD_DATA);
+
+		if (count < bytes_to_read)
+			buffer[count++] = temp & 0xff;
+		if (count < bytes_to_read)
+			buffer[count++] = (temp >> 8) & 0xff;
+		if (count < bytes_to_read)
+			buffer[count++] = (temp >> 16) & 0xff;
+		if (count < bytes_to_read)
+			buffer[count++] = (temp >> 24) & 0xff;
+
+		ret = dsi_reg_rd(ctx, CMD_MODE_STATUS, GEN_CMD_RDATA_FIFO_EMPTY, 1);
+		if (ret)
+			return count;
+	}
+
+	return 0;
+}
+
+static void sprd_dsi_set_work_mode(struct dsi_context *ctx, u8 mode)
+{
+	if (mode == DSI_MODE_CMD)
+		writel(1, ctx->base + DSI_MODE_CFG);
+	else
+		writel(0, ctx->base + DSI_MODE_CFG);
+}
+
+static void sprd_dsi_state_reset(struct dsi_context *ctx)
+{
+	writel(0, ctx->base + SOFT_RESET);
+	udelay(100);
+	writel(1, ctx->base + SOFT_RESET);
+}
+
+static int sprd_dphy_init(struct dsi_context *ctx)
+{
+	struct sprd_dsi *dsi = container_of(ctx, struct sprd_dsi, ctx);
+	int ret;
+
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, 0);
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_SHUTDOWN, 0);
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_CLK_EN, 0);
+
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLR, 0);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLR, PHY_TESTCLR);
+	dsi_reg_up(ctx, PHY_TST_CTRL0, PHY_TESTCLR, 0);
+
+	dphy_pll_config(ctx);
+	dphy_timing_config(ctx);
+
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_SHUTDOWN, RF_PHY_SHUTDOWN);
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, RF_PHY_RESET_N);
+	writel(0x1C, ctx->base + PHY_MIN_STOP_TIME);
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_CLK_EN, RF_PHY_CLK_EN);
+	writel(dsi->slave->lanes - 1, ctx->base + PHY_LANE_NUM_CONFIG);
+
+	ret = dphy_wait_pll_locked(ctx);
+	if (ret) {
+		drm_err(dsi->drm, "dphy initial failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void sprd_dphy_fini(struct dsi_context *ctx)
+{
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, 0);
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_SHUTDOWN, 0);
+	dsi_reg_up(ctx, PHY_INTERFACE_CTRL, RF_PHY_RESET_N, RF_PHY_RESET_N);
+}
+
+static void sprd_dsi_encoder_mode_set(struct drm_encoder *encoder,
+				      struct drm_display_mode *mode,
+				 struct drm_display_mode *adj_mode)
+{
+	struct sprd_dsi *dsi = encoder_to_dsi(encoder);
+
+	drm_display_mode_to_videomode(adj_mode, &dsi->ctx.vm);
+}
+
+static void sprd_dsi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct sprd_dsi *dsi = encoder_to_dsi(encoder);
+	struct sprd_dpu *dpu = to_sprd_crtc(encoder->crtc);
+	struct dsi_context *ctx = &dsi->ctx;
+
+	if (ctx->enabled) {
+		drm_warn(dsi->drm, "dsi is initialized\n");
+		return;
+	}
+
+	sprd_dsi_init(ctx);
+	if (ctx->work_mode == DSI_MODE_VIDEO)
+		sprd_dsi_dpi_video(ctx);
+	else
+		sprd_dsi_edpi_video(ctx);
+
+	sprd_dphy_init(ctx);
+
+	sprd_dsi_set_work_mode(ctx, ctx->work_mode);
+	sprd_dsi_state_reset(ctx);
+
+	if (dsi->slave->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
+		dsi_reg_up(ctx, PHY_CLK_LANE_LP_CTRL, AUTO_CLKLANE_CTRL_EN,
+			   AUTO_CLKLANE_CTRL_EN);
+	} else {
+		dsi_reg_up(ctx, PHY_CLK_LANE_LP_CTRL, RF_PHY_CLK_EN, RF_PHY_CLK_EN);
+		dsi_reg_up(ctx, PHY_CLK_LANE_LP_CTRL, PHY_CLKLANE_TX_REQ_HS,
+			   PHY_CLKLANE_TX_REQ_HS);
+		dphy_wait_pll_locked(ctx);
+	}
+
+	sprd_dpu_run(dpu);
+
+	ctx->enabled = true;
+}
+
+static void sprd_dsi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct sprd_dsi *dsi = encoder_to_dsi(encoder);
+	struct sprd_dpu *dpu = to_sprd_crtc(encoder->crtc);
+	struct dsi_context *ctx = &dsi->ctx;
+
+	if (!ctx->enabled) {
+		drm_warn(dsi->drm, "dsi isn't initialized\n");
+		return;
+	}
+
+	sprd_dpu_stop(dpu);
+	sprd_dphy_fini(ctx);
+	sprd_dsi_fini(ctx);
+
+	ctx->enabled = false;
+}
+
+static const struct drm_encoder_helper_funcs sprd_encoder_helper_funcs = {
+	.mode_set	= sprd_dsi_encoder_mode_set,
+	.enable		= sprd_dsi_encoder_enable,
+	.disable	= sprd_dsi_encoder_disable
+};
+
+static const struct drm_encoder_funcs sprd_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int sprd_dsi_encoder_init(struct sprd_dsi *dsi,
+				 struct device *dev)
+{
+	struct drm_encoder *encoder = &dsi->encoder;
+	u32 crtc_mask;
+	int ret;
+
+	crtc_mask = drm_of_find_possible_crtcs(dsi->drm, dev->of_node);
+	if (!crtc_mask) {
+		drm_err(dsi->drm, "failed to find crtc mask\n");
+		return -EINVAL;
+	}
+
+	drm_dbg(dsi->drm, "find possible crtcs: 0x%08x\n", crtc_mask);
+
+	encoder->possible_crtcs = crtc_mask;
+	ret = drm_encoder_init(dsi->drm, encoder, &sprd_encoder_funcs,
+			       DRM_MODE_ENCODER_DSI, NULL);
+	if (ret) {
+		drm_err(dsi->drm, "failed to init dsi encoder\n");
+		return ret;
+	}
+
+	drm_encoder_helper_add(encoder, &sprd_encoder_helper_funcs);
+
+	return 0;
+}
+
+static int sprd_dsi_bridge_init(struct sprd_dsi *dsi,
+				struct device *dev)
+{
+	int ret;
+
+	dsi->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
+	if (IS_ERR(dsi->panel_bridge))
+		return PTR_ERR(dsi->panel_bridge);
+
+	ret = drm_bridge_attach(&dsi->encoder, dsi->panel_bridge, NULL, 0);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int sprd_dsi_context_init(struct sprd_dsi *dsi,
+				 struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct dsi_context *ctx = &dsi->ctx;
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	ctx->base = devm_ioremap(dev, res->start, resource_size(res));
+	if (!ctx->base) {
+		drm_err(dsi->drm, "failed to map dsi host registers\n");
+		return -ENXIO;
+	}
+
+	ctx->regmap = devm_regmap_init(dev, &regmap_tst_io, dsi, &byte_config);
+	if (IS_ERR(ctx->regmap)) {
+		drm_err(dsi->drm, "dphy regmap init failed\n");
+		return PTR_ERR(ctx->regmap);
+	}
+
+	ctx->data_hs2lp = 120;
+	ctx->data_lp2hs = 500;
+	ctx->clk_hs2lp = 4;
+	ctx->clk_lp2hs = 15;
+	ctx->max_rd_time = 6000;
+	ctx->int0_mask = 0xffffffff;
+	ctx->int1_mask = 0xffffffff;
+	ctx->enabled = true;
+
+	return 0;
+}
+
+static int sprd_dsi_bind(struct device *dev, struct device *master, void *data)
+{
+	struct drm_device *drm = data;
+	struct sprd_dsi *dsi = dev_get_drvdata(dev);
+	int ret;
+
+	dsi->drm = drm;
+
+	ret = sprd_dsi_encoder_init(dsi, dev);
+	if (ret)
+		return ret;
+
+	ret = sprd_dsi_bridge_init(dsi, dev);
+	if (ret)
+		return ret;
+
+	ret = sprd_dsi_context_init(dsi, dev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void sprd_dsi_unbind(struct device *dev,
+			    struct device *master, void *data)
+{
+	struct sprd_dsi *dsi = dev_get_drvdata(dev);
+
+	drm_of_panel_bridge_remove(dev->of_node, 1, 0);
+
+	drm_encoder_cleanup(&dsi->encoder);
+}
+
+static const struct component_ops dsi_component_ops = {
+	.bind	= sprd_dsi_bind,
+	.unbind	= sprd_dsi_unbind,
+};
+
+static int sprd_dsi_host_attach(struct mipi_dsi_host *host,
+				struct mipi_dsi_device *slave)
+{
+	struct sprd_dsi *dsi = host_to_dsi(host);
+	struct dsi_context *ctx = &dsi->ctx;
+
+	dsi->slave = slave;
+
+	if (slave->mode_flags & MIPI_DSI_MODE_VIDEO)
+		ctx->work_mode = DSI_MODE_VIDEO;
+	else
+		ctx->work_mode = DSI_MODE_CMD;
+
+	if (slave->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+		ctx->burst_mode = VIDEO_BURST_WITH_SYNC_PULSES;
+	else if (slave->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
+		ctx->burst_mode = VIDEO_NON_BURST_WITH_SYNC_PULSES;
+	else
+		ctx->burst_mode = VIDEO_NON_BURST_WITH_SYNC_EVENTS;
+
+	return component_add(host->dev, &dsi_component_ops);
+}
+
+static int sprd_dsi_host_detach(struct mipi_dsi_host *host,
+				struct mipi_dsi_device *slave)
+{
+	component_del(host->dev, &dsi_component_ops);
+
+	return 0;
+}
+
+static ssize_t sprd_dsi_host_transfer(struct mipi_dsi_host *host,
+				      const struct mipi_dsi_msg *msg)
+{
+	struct sprd_dsi *dsi = host_to_dsi(host);
+	const u8 *tx_buf = msg->tx_buf;
+
+	if (msg->rx_buf && msg->rx_len) {
+		u8 lsb = (msg->tx_len > 0) ? tx_buf[0] : 0;
+		u8 msb = (msg->tx_len > 1) ? tx_buf[1] : 0;
+
+		return sprd_dsi_rd_pkt(&dsi->ctx, msg->channel, msg->type,
+				msb, lsb, msg->rx_buf, msg->rx_len);
+	}
+
+	if (msg->tx_buf && msg->tx_len)
+		return sprd_dsi_wr_pkt(&dsi->ctx, msg->channel, msg->type,
+					tx_buf, msg->tx_len);
+
+	return 0;
+}
+
+static const struct mipi_dsi_host_ops sprd_dsi_host_ops = {
+	.attach = sprd_dsi_host_attach,
+	.detach = sprd_dsi_host_detach,
+	.transfer = sprd_dsi_host_transfer,
+};
+
+static const struct of_device_id dsi_match_table[] = {
+	{ .compatible = "sprd,sharkl3-dsi-host" },
+	{ /* sentinel */ },
+};
+
+static int sprd_dsi_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sprd_dsi *dsi;
+
+	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+	if (!dsi)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, dsi);
+
+	dsi->host.ops = &sprd_dsi_host_ops;
+	dsi->host.dev = dev;
+
+	return mipi_dsi_host_register(&dsi->host);
+}
+
+static int sprd_dsi_remove(struct platform_device *pdev)
+{
+	struct sprd_dsi *dsi = dev_get_drvdata(&pdev->dev);
+
+	mipi_dsi_host_unregister(&dsi->host);
+
+	return 0;
+}
+
+struct platform_driver sprd_dsi_driver = {
+	.probe = sprd_dsi_probe,
+	.remove = sprd_dsi_remove,
+	.driver = {
+		.name = "sprd-dsi-drv",
+		.of_match_table = dsi_match_table,
+	},
+};
+
+MODULE_AUTHOR("Leon He <leon.he@unisoc.com>");
+MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>");
+MODULE_DESCRIPTION("Unisoc MIPI DSI HOST Controller Driver");
+MODULE_LICENSE("GPL v2");

drivers/gpu/drm/sprd/sprd_dsi.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Unisoc Inc.
+ */
+
+#ifndef __SPRD_DSI_H__
+#define __SPRD_DSI_H__
+
+#include <linux/of.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <video/videomode.h>
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+#include <drm/drm_panel.h>
+
+#define encoder_to_dsi(encoder) \
+	container_of(encoder, struct sprd_dsi, encoder)
+
+enum dsi_work_mode {
+	DSI_MODE_CMD = 0,
+	DSI_MODE_VIDEO
+};
+
+enum video_burst_mode {
+	VIDEO_NON_BURST_WITH_SYNC_PULSES = 0,
+	VIDEO_NON_BURST_WITH_SYNC_EVENTS,
+	VIDEO_BURST_WITH_SYNC_PULSES
+};
+
+enum dsi_color_coding {
+	COLOR_CODE_16BIT_CONFIG1 = 0,
+	COLOR_CODE_16BIT_CONFIG2,
+	COLOR_CODE_16BIT_CONFIG3,
+	COLOR_CODE_18BIT_CONFIG1,
+	COLOR_CODE_18BIT_CONFIG2,
+	COLOR_CODE_24BIT,
+	COLOR_CODE_20BIT_YCC422_LOOSELY,
+	COLOR_CODE_24BIT_YCC422,
+	COLOR_CODE_16BIT_YCC422,
+	COLOR_CODE_30BIT,
+	COLOR_CODE_36BIT,
+	COLOR_CODE_12BIT_YCC420,
+	COLOR_CODE_COMPRESSTION,
+	COLOR_CODE_MAX
+};
+
+enum pll_timing {
+	NONE,
+	REQUEST_TIME,
+	PREPARE_TIME,
+	SETTLE_TIME,
+	ZERO_TIME,
+	TRAIL_TIME,
+	EXIT_TIME,
+	CLKPOST_TIME,
+	TA_GET,
+	TA_GO,
+	TA_SURE,
+	TA_WAIT,
+};
+
+struct dphy_pll {
+	u8 refin; /* Pre-divider control signal */
+	u8 cp_s; /* 00: SDM_EN=1, 10: SDM_EN=0 */
+	u8 fdk_s; /* PLL mode control: integer or fraction */
+	u8 sdm_en;
+	u8 div;
+	u8 int_n; /* integer N PLL */
+	u32 ref_clk; /* dphy reference clock, unit: MHz */
+	u32 freq; /* panel config, unit: KHz */
+	u32 fvco;
+	u32 potential_fvco;
+	u32 nint; /* sigma delta modulator NINT control */
+	u32 kint; /* sigma delta modulator KINT control */
+	u8 lpf_sel; /* low pass filter control */
+	u8 out_sel; /* post divider control */
+	u8 vco_band; /* vco range */
+	u8 det_delay;
+};
+
+struct dsi_context {
+	void __iomem *base;
+	struct regmap *regmap;
+	struct dphy_pll pll;
+	struct videomode vm;
+	bool enabled;
+
+	u8 work_mode;
+	u8 burst_mode;
+	u32 int0_mask;
+	u32 int1_mask;
+
+	/* maximum time (ns) for data lanes from HS to LP */
+	u16 data_hs2lp;
+	/* maximum time (ns) for data lanes from LP to HS */
+	u16 data_lp2hs;
+	/* maximum time (ns) for clk lanes from HS to LP */
+	u16 clk_hs2lp;
+	/* maximum time (ns) for clk lanes from LP to HS */
+	u16 clk_lp2hs;
+	/* maximum time (ns) for BTA operation - REQUIRED */
+	u16 max_rd_time;
+	/* enable receiving frame ack packets - for video mode */
+	bool frame_ack_en;
+	/* enable receiving tear effect ack packets - for cmd mode */
+	bool te_ack_en;
+};
+
+struct sprd_dsi {
+	struct drm_device *drm;
+	struct mipi_dsi_host host;
+	struct mipi_dsi_device *slave;
+	struct drm_encoder encoder;
+	struct drm_bridge *panel_bridge;
+	struct dsi_context ctx;
+};
+
+int dphy_pll_config(struct dsi_context *ctx);
+void dphy_timing_config(struct dsi_context *ctx);
+
+#endif /* __SPRD_DSI_H__ */