imx93-mipi-dsi.c

// SPDX-License-Identifier: GPL-2.0+

/*
 * Copyright 2022,2023 NXP
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/math.h>
#include <linux/media-bus-format.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-mipi-dphy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <drm/bridge/dw_mipi_dsi.h>
#include <drm/drm_bridge.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>

/* DPHY PLL configuration registers */
#define DSI_REG				0x4c
#define  CFGCLKFREQRANGE_MASK		GENMASK(5, 0)
#define  CFGCLKFREQRANGE(x)		FIELD_PREP(CFGCLKFREQRANGE_MASK, (x))
#define  CLKSEL_MASK			GENMASK(7, 6)
#define  CLKSEL_STOP			FIELD_PREP(CLKSEL_MASK, 0)
#define  CLKSEL_GEN			FIELD_PREP(CLKSEL_MASK, 1)
#define  CLKSEL_EXT			FIELD_PREP(CLKSEL_MASK, 2)
#define  HSFREQRANGE_MASK		GENMASK(14, 8)
#define  HSFREQRANGE(x)			FIELD_PREP(HSFREQRANGE_MASK, (x))
#define  UPDATE_PLL			BIT(17)
#define  SHADOW_CLR			BIT(18)
#define  CLK_EXT			BIT(19)

#define DSI_WRITE_REG0			0x50
#define  M_MASK				GENMASK(9, 0)
#define  M(x)				FIELD_PREP(M_MASK, ((x) - 2))
#define  N_MASK				GENMASK(13, 10)
#define  N(x)				FIELD_PREP(N_MASK, ((x) - 1))
#define  VCO_CTRL_MASK			GENMASK(19, 14)
#define  VCO_CTRL(x)			FIELD_PREP(VCO_CTRL_MASK, (x))
#define  PROP_CTRL_MASK			GENMASK(25, 20)
#define  PROP_CTRL(x)			FIELD_PREP(PROP_CTRL_MASK, (x))
#define  INT_CTRL_MASK			GENMASK(31, 26)
#define  INT_CTRL(x)			FIELD_PREP(INT_CTRL_MASK, (x))

#define DSI_WRITE_REG1			0x54
#define  GMP_CTRL_MASK			GENMASK(1, 0)
#define  GMP_CTRL(x)			FIELD_PREP(GMP_CTRL_MASK, (x))
#define  CPBIAS_CTRL_MASK		GENMASK(8, 2)
#define  CPBIAS_CTRL(x)			FIELD_PREP(CPBIAS_CTRL_MASK, (x))
#define  PLL_SHADOW_CTRL		BIT(9)

/* display mux control register */
#define DISPLAY_MUX			0x60
#define  MIPI_DSI_RGB666_MAP_CFG	GENMASK(7, 6)
#define  RGB666_CONFIG1			FIELD_PREP(MIPI_DSI_RGB666_MAP_CFG, 0)
#define  RGB666_CONFIG2			FIELD_PREP(MIPI_DSI_RGB666_MAP_CFG, 1)
#define  MIPI_DSI_RGB565_MAP_CFG	GENMASK(5, 4)
#define  RGB565_CONFIG1			FIELD_PREP(MIPI_DSI_RGB565_MAP_CFG, 0)
#define  RGB565_CONFIG2			FIELD_PREP(MIPI_DSI_RGB565_MAP_CFG, 1)
#define  RGB565_CONFIG3			FIELD_PREP(MIPI_DSI_RGB565_MAP_CFG, 2)
#define  LCDIF_CROSS_LINE_PATTERN	GENMASK(3, 0)
#define  RGB888_TO_RGB888		FIELD_PREP(LCDIF_CROSS_LINE_PATTERN, 0)
#define  RGB888_TO_RGB666		FIELD_PREP(LCDIF_CROSS_LINE_PATTERN, 6)
#define  RGB565_TO_RGB565		FIELD_PREP(LCDIF_CROSS_LINE_PATTERN, 7)

#define MHZ(x)				((x) * 1000000UL)

#define REF_CLK_RATE_MAX		MHZ(64)
#define REF_CLK_RATE_MIN		MHZ(2)
#define FOUT_MAX			MHZ(1250)
#define FOUT_MIN			MHZ(40)
#define FVCO_DIV_FACTOR			MHZ(80)

#define MBPS(x)				((x) * 1000000UL)

#define DATA_RATE_MAX_SPEED		MBPS(2500)
#define DATA_RATE_MIN_SPEED		MBPS(80)

#define M_MAX				625UL
#define M_MIN				64UL

#define N_MAX				16U
#define N_MIN				1U

struct imx93_dsi {
	struct device *dev;
	struct regmap *regmap;
	struct clk *clk_pixel;
	struct clk *clk_ref;
	struct clk *clk_cfg;
	struct dw_mipi_dsi *dmd;
	struct dw_mipi_dsi_plat_data pdata;
	union phy_configure_opts phy_cfg;
	unsigned long ref_clk_rate;
	u32 format;
};

struct dphy_pll_cfg {
	u32 m;	/* PLL Feedback Multiplication Ratio */
	u32 n;	/* PLL Input Frequency Division Ratio */
};

struct dphy_pll_vco_prop {
	unsigned long max_fout;
	u8 vco_cntl;
	u8 prop_cntl;
};

struct dphy_pll_hsfreqrange {
	unsigned long max_mbps;
	u8 hsfreqrange;
};

/* DPHY Databook Table 3-13 Charge-pump Programmability */
static const struct dphy_pll_vco_prop vco_prop_map[] = {
	{   55, 0x3f, 0x0d },
	{   82, 0x37, 0x0d },
	{  110, 0x2f, 0x0d },
	{  165, 0x27, 0x0d },
	{  220, 0x1f, 0x0d },
	{  330, 0x17, 0x0d },
	{  440, 0x0f, 0x0d },
	{  660, 0x07, 0x0d },
	{ 1149, 0x03, 0x0d },
	{ 1152, 0x01, 0x0d },
	{ 1250, 0x01, 0x0e },
};

/* DPHY Databook Table 5-7 Frequency Ranges and Defaults */
static const struct dphy_pll_hsfreqrange hsfreqrange_map[] = {
	{   89, 0x00 },
	{   99, 0x10 },
	{  109, 0x20 },
	{  119, 0x30 },
	{  129, 0x01 },
	{  139, 0x11 },
	{  149, 0x21 },
	{  159, 0x31 },
	{  169, 0x02 },
	{  179, 0x12 },
	{  189, 0x22 },
	{  204, 0x32 },
	{  219, 0x03 },
	{  234, 0x13 },
	{  249, 0x23 },
	{  274, 0x33 },
	{  299, 0x04 },
	{  324, 0x14 },
	{  349, 0x25 },
	{  399, 0x35 },
	{  449, 0x05 },
	{  499, 0x16 },
	{  549, 0x26 },
	{  599, 0x37 },
	{  649, 0x07 },
	{  699, 0x18 },
	{  749, 0x28 },
	{  799, 0x39 },
	{  849, 0x09 },
	{  899, 0x19 },
	{  949, 0x29 },
	{  999, 0x3a },
	{ 1049, 0x0a },
	{ 1099, 0x1a },
	{ 1149, 0x2a },
	{ 1199, 0x3b },
	{ 1249, 0x0b },
	{ 1299, 0x1b },
	{ 1349, 0x2b },
	{ 1399, 0x3c },
	{ 1449, 0x0c },
	{ 1499, 0x1c },
	{ 1549, 0x2c },
	{ 1599, 0x3d },
	{ 1649, 0x0d },
	{ 1699, 0x1d },
	{ 1749, 0x2e },
	{ 1799, 0x3e },
	{ 1849, 0x0e },
	{ 1899, 0x1e },
	{ 1949, 0x2f },
	{ 1999, 0x3f },
	{ 2049, 0x0f },
	{ 2099, 0x40 },
	{ 2149, 0x41 },
	{ 2199, 0x42 },
	{ 2249, 0x43 },
	{ 2299, 0x44 },
	{ 2349, 0x45 },
	{ 2399, 0x46 },
	{ 2449, 0x47 },
	{ 2499, 0x48 },
	{ 2500, 0x49 },
};

static void dphy_pll_write(struct imx93_dsi *dsi, unsigned int reg, u32 value)
{
	int ret;

	ret = regmap_write(dsi->regmap, reg, value);
	if (ret < 0)
		dev_err(dsi->dev, "failed to write 0x%08x to pll reg 0x%x: %d\n",
			value, reg, ret);
}

static inline unsigned long data_rate_to_fout(unsigned long data_rate)
{
	/* Fout is half of data rate */
	return data_rate / 2;
}

static int
dphy_pll_get_configure_from_opts(struct imx93_dsi *dsi,
				 struct phy_configure_opts_mipi_dphy *dphy_opts,
				 struct dphy_pll_cfg *cfg)
{
	struct device *dev = dsi->dev;
	unsigned long fin = dsi->ref_clk_rate;
	unsigned long fout;
	unsigned long best_fout = 0;
	unsigned int fvco_div;
	unsigned int min_n, max_n, n, best_n = UINT_MAX;
	unsigned long m, best_m = 0;
	unsigned long min_delta = ULONG_MAX;
	unsigned long delta;
	u64 tmp;

	if (dphy_opts->hs_clk_rate < DATA_RATE_MIN_SPEED ||
	    dphy_opts->hs_clk_rate > DATA_RATE_MAX_SPEED) {
		dev_dbg(dev, "invalid data rate per lane: %lu\n",
			dphy_opts->hs_clk_rate);
		return -EINVAL;
	}

	fout = data_rate_to_fout(dphy_opts->hs_clk_rate);

	/* DPHY Databook 3.3.6.1 Output Frequency */
	/* Fout = Fvco / Fvco_div = (Fin * M) / (Fvco_div * N) */
	/* Fvco_div could be 1/2/4/8 according to Fout range. */
	fvco_div = 8UL / min(DIV_ROUND_UP(fout, FVCO_DIV_FACTOR), 8UL);

	/* limitation: 2MHz <= Fin / N <= 8MHz */
	min_n = DIV_ROUND_UP_ULL((u64)fin, MHZ(8));
	max_n = DIV_ROUND_DOWN_ULL((u64)fin, MHZ(2));

	/* clamp possible N(s) */
	min_n = clamp(min_n, N_MIN, N_MAX);
	max_n = clamp(max_n, N_MIN, N_MAX);

	dev_dbg(dev, "Fout = %lu, Fvco_div = %u, n_range = [%u, %u]\n",
		fout, fvco_div, min_n, max_n);

	for (n = min_n; n <= max_n; n++) {
		/* M = (Fout * N * Fvco_div) / Fin */
		m = DIV_ROUND_CLOSEST(fout * n * fvco_div, fin);

		/* check M range */
		if (m < M_MIN || m > M_MAX)
			continue;

		/* calculate temporary Fout */
		tmp = m * fin;
		do_div(tmp, n * fvco_div);
		if (tmp < FOUT_MIN || tmp > FOUT_MAX)
			continue;

		delta = abs(fout - tmp);
		if (delta < min_delta) {
			best_n = n;
			best_m = m;
			min_delta = delta;
			best_fout = tmp;
		}
	}

	if (best_fout) {
		cfg->m = best_m;
		cfg->n = best_n;
		dev_dbg(dev, "best Fout = %lu, m = %u, n = %u\n",
			best_fout, cfg->m, cfg->n);
	} else {
		dev_dbg(dev, "failed to find best Fout\n");
		return -EINVAL;
	}

	return 0;
}

static void dphy_pll_clear_shadow(struct imx93_dsi *dsi)
{
	/* Reference DPHY Databook Figure 3-3 Initialization Timing Diagram. */
	/* Select clock generation first. */
	dphy_pll_write(dsi, DSI_REG, CLKSEL_GEN);

	/* Clear shadow after clock selection is done a while. */
	fsleep(1);
	dphy_pll_write(dsi, DSI_REG, CLKSEL_GEN | SHADOW_CLR);

	/* A minimum pulse of 5ns on shadow_clear signal. */
	fsleep(1);
	dphy_pll_write(dsi, DSI_REG, CLKSEL_GEN);
}

static unsigned long dphy_pll_get_cfgclkrange(struct imx93_dsi *dsi)
{
	/*
	 * DPHY Databook Table 4-4 System Control Signals mentions an equation
	 * for cfgclkfreqrange[5:0].
	 */
	return (clk_get_rate(dsi->clk_cfg) / MHZ(1) - 17) * 4;
}

static u8
dphy_pll_get_hsfreqrange(struct phy_configure_opts_mipi_dphy *dphy_opts)
{
	unsigned long mbps = dphy_opts->hs_clk_rate / MHZ(1);
	int i;

	for (i = 0; i < ARRAY_SIZE(hsfreqrange_map); i++)
		if (mbps <= hsfreqrange_map[i].max_mbps)
			return hsfreqrange_map[i].hsfreqrange;

	return 0;
}

static u8 dphy_pll_get_vco(struct phy_configure_opts_mipi_dphy *dphy_opts)
{
	unsigned long fout = data_rate_to_fout(dphy_opts->hs_clk_rate) / MHZ(1);
	int i;

	for (i = 0; i < ARRAY_SIZE(vco_prop_map); i++)
		if (fout <= vco_prop_map[i].max_fout)
			return vco_prop_map[i].vco_cntl;

	return 0;
}

static u8 dphy_pll_get_prop(struct phy_configure_opts_mipi_dphy *dphy_opts)
{
	unsigned long fout = data_rate_to_fout(dphy_opts->hs_clk_rate) / MHZ(1);
	int i;

	for (i = 0; i < ARRAY_SIZE(vco_prop_map); i++)
		if (fout <= vco_prop_map[i].max_fout)
			return vco_prop_map[i].prop_cntl;

	return 0;
}

static int dphy_pll_update(struct imx93_dsi *dsi)
{
	int ret;

	ret = regmap_update_bits(dsi->regmap, DSI_REG, UPDATE_PLL, UPDATE_PLL);
	if (ret < 0) {
		dev_err(dsi->dev, "failed to set UPDATE_PLL: %d\n", ret);
		return ret;
	}

	/*
	 * The updatepll signal should be asserted for a minimum of four clkin
	 * cycles, according to DPHY Databook Figure 3-3 Initialization Timing
	 * Diagram.
	 */
	fsleep(10);

	ret = regmap_update_bits(dsi->regmap, DSI_REG, UPDATE_PLL, 0);
	if (ret < 0) {
		dev_err(dsi->dev, "failed to clear UPDATE_PLL: %d\n", ret);
		return ret;
	}

	return 0;
}

static int dphy_pll_configure(struct imx93_dsi *dsi, union phy_configure_opts *opts)
{
	struct dphy_pll_cfg cfg = { 0 };
	u32 val;
	int ret;

	ret = dphy_pll_get_configure_from_opts(dsi, &opts->mipi_dphy, &cfg);
	if (ret) {
		dev_err(dsi->dev, "failed to get phy pll cfg %d\n", ret);
		return ret;
	}

	dphy_pll_clear_shadow(dsi);

	/* DSI_REG */
	val = CLKSEL_GEN |
	      CFGCLKFREQRANGE(dphy_pll_get_cfgclkrange(dsi)) |
	      HSFREQRANGE(dphy_pll_get_hsfreqrange(&opts->mipi_dphy));
	dphy_pll_write(dsi, DSI_REG, val);

	/* DSI_WRITE_REG0 */
	val = M(cfg.m) | N(cfg.n) | INT_CTRL(0) |
	      VCO_CTRL(dphy_pll_get_vco(&opts->mipi_dphy)) |
	      PROP_CTRL(dphy_pll_get_prop(&opts->mipi_dphy));
	dphy_pll_write(dsi, DSI_WRITE_REG0, val);

	/* DSI_WRITE_REG1 */
	dphy_pll_write(dsi, DSI_WRITE_REG1, GMP_CTRL(1) | CPBIAS_CTRL(0x10));

	ret = clk_prepare_enable(dsi->clk_ref);
	if (ret < 0) {
		dev_err(dsi->dev, "failed to enable ref clock: %d\n", ret);
		return ret;
	}

	/*
	 * At least 10 refclk cycles are required before updatePLL assertion,
	 * according to DPHY Databook Figure 3-3 Initialization Timing Diagram.
	 */
	fsleep(10);

	ret = dphy_pll_update(dsi);
	if (ret < 0) {
		clk_disable_unprepare(dsi->clk_ref);
		return ret;
	}

	return 0;
}

static void dphy_pll_clear_reg(struct imx93_dsi *dsi)
{
	dphy_pll_write(dsi, DSI_REG, 0);
	dphy_pll_write(dsi, DSI_WRITE_REG0, 0);
	dphy_pll_write(dsi, DSI_WRITE_REG1, 0);
}

static int dphy_pll_init(struct imx93_dsi *dsi)
{
	int ret;

	ret = clk_prepare_enable(dsi->clk_cfg);
	if (ret < 0) {
		dev_err(dsi->dev, "failed to enable config clock: %d\n", ret);
		return ret;
	}

	dphy_pll_clear_reg(dsi);

	return 0;
}

static void dphy_pll_uninit(struct imx93_dsi *dsi)
{
	dphy_pll_clear_reg(dsi);
	clk_disable_unprepare(dsi->clk_cfg);
}

static void dphy_pll_power_off(struct imx93_dsi *dsi)
{
	dphy_pll_clear_reg(dsi);
	clk_disable_unprepare(dsi->clk_ref);
}

static int imx93_dsi_get_phy_configure_opts(struct imx93_dsi *dsi,
					    const struct drm_display_mode *mode,
					    union phy_configure_opts *phy_cfg,
					    u32 lanes, u32 format)
{
	struct device *dev = dsi->dev;
	int bpp;
	int ret;

	bpp = mipi_dsi_pixel_format_to_bpp(format);
	if (bpp < 0) {
		dev_dbg(dev, "failed to get bpp for pixel format %d\n", format);
		return -EINVAL;
	}

	ret = phy_mipi_dphy_get_default_config(mode->clock * MSEC_PER_SEC, bpp,
					       lanes, &phy_cfg->mipi_dphy);
	if (ret < 0) {
		dev_dbg(dev, "failed to get default phy cfg %d\n", ret);
		return ret;
	}

	return 0;
}

static enum drm_mode_status
imx93_dsi_validate_mode(struct imx93_dsi *dsi, const struct drm_display_mode *mode)
{
	struct drm_bridge *bridge = dw_mipi_dsi_get_bridge(dsi->dmd);

	/* Get the last bridge */
	while (drm_bridge_get_next_bridge(bridge))
		bridge = drm_bridge_get_next_bridge(bridge);

	if ((bridge->ops & DRM_BRIDGE_OP_DETECT) &&
	    (bridge->ops & DRM_BRIDGE_OP_EDID)) {
		unsigned long pixel_clock_rate = mode->clock * 1000;
		unsigned long rounded_rate;

		/* Allow +/-0.5% pixel clock rate deviation */
		rounded_rate = clk_round_rate(dsi->clk_pixel, pixel_clock_rate);
		if (rounded_rate < pixel_clock_rate * 995 / 1000 ||
		    rounded_rate > pixel_clock_rate * 1005 / 1000) {
			dev_dbg(dsi->dev, "failed to round clock for mode " DRM_MODE_FMT "\n",
				DRM_MODE_ARG(mode));
			return MODE_NOCLOCK;
		}
	}

	return MODE_OK;
}

static enum drm_mode_status
imx93_dsi_validate_phy(struct imx93_dsi *dsi, const struct drm_display_mode *mode,
		       unsigned long mode_flags, u32 lanes, u32 format)
{
	union phy_configure_opts phy_cfg;
	struct dphy_pll_cfg cfg = { 0 };
	struct device *dev = dsi->dev;
	int ret;

	ret = imx93_dsi_get_phy_configure_opts(dsi, mode, &phy_cfg, lanes,
					       format);
	if (ret < 0) {
		dev_dbg(dev, "failed to get phy cfg opts %d\n", ret);
		return MODE_ERROR;
	}

	ret = dphy_pll_get_configure_from_opts(dsi, &phy_cfg.mipi_dphy, &cfg);
	if (ret < 0) {
		dev_dbg(dev, "failed to get phy pll cfg %d\n", ret);
		return MODE_NOCLOCK;
	}

	return MODE_OK;
}

static enum drm_mode_status
imx93_dsi_mode_valid(void *priv_data, const struct drm_display_mode *mode,
		     unsigned long mode_flags, u32 lanes, u32 format)
{
	struct imx93_dsi *dsi = priv_data;
	struct device *dev = dsi->dev;
	enum drm_mode_status ret;

	ret = imx93_dsi_validate_mode(dsi, mode);
	if (ret != MODE_OK) {
		dev_dbg(dev, "failed to validate mode " DRM_MODE_FMT "\n",
			DRM_MODE_ARG(mode));
		return ret;
	}

	ret = imx93_dsi_validate_phy(dsi, mode, mode_flags, lanes, format);
	if (ret != MODE_OK) {
		dev_dbg(dev, "failed to validate phy for mode " DRM_MODE_FMT "\n",
			DRM_MODE_ARG(mode));
		return ret;
	}

	return MODE_OK;
}

static bool imx93_dsi_mode_fixup(void *priv_data,
				 const struct drm_display_mode *mode,
				 struct drm_display_mode *adjusted_mode)
{
	struct imx93_dsi *dsi = priv_data;
	unsigned long pixel_clock_rate;
	unsigned long rounded_rate;

	pixel_clock_rate = mode->clock * 1000;
	rounded_rate = clk_round_rate(dsi->clk_pixel, pixel_clock_rate);

	memcpy(adjusted_mode, mode, sizeof(*mode));
	adjusted_mode->clock = rounded_rate / 1000;

	dev_dbg(dsi->dev, "adj clock %d for mode " DRM_MODE_FMT "\n",
		adjusted_mode->clock, DRM_MODE_ARG(mode));

	return true;
}

static u32 *imx93_dsi_get_input_bus_fmts(void *priv_data,
					 struct drm_bridge *bridge,
					 struct drm_bridge_state *bridge_state,
					 struct drm_crtc_state *crtc_state,
					 struct drm_connector_state *conn_state,
					 u32 output_fmt,
					 unsigned int *num_input_fmts)
{
	u32 *input_fmts, input_fmt;

	*num_input_fmts = 0;

	switch (output_fmt) {
	case MEDIA_BUS_FMT_RGB888_1X24:
	case MEDIA_BUS_FMT_RGB666_1X18:
	case MEDIA_BUS_FMT_FIXED:
		input_fmt = MEDIA_BUS_FMT_RGB888_1X24;
		break;
	case MEDIA_BUS_FMT_RGB565_1X16:
		input_fmt = output_fmt;
		break;
	default:
		return NULL;
	}

	input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
	if (!input_fmts)
		return NULL;
	input_fmts[0] = input_fmt;
	*num_input_fmts = 1;

	return input_fmts;
}

static int imx93_dsi_phy_init(void *priv_data)
{
	struct imx93_dsi *dsi = priv_data;
	unsigned int fmt = 0;
	int ret;

	switch (dsi->format) {
	case MIPI_DSI_FMT_RGB888:
		fmt = RGB888_TO_RGB888;
		break;
	case MIPI_DSI_FMT_RGB666:
		fmt = RGB888_TO_RGB666;
		regmap_update_bits(dsi->regmap, DISPLAY_MUX,
				   MIPI_DSI_RGB666_MAP_CFG, RGB666_CONFIG2);
		break;
	case MIPI_DSI_FMT_RGB666_PACKED:
		fmt = RGB888_TO_RGB666;
		regmap_update_bits(dsi->regmap, DISPLAY_MUX,
				   MIPI_DSI_RGB666_MAP_CFG, RGB666_CONFIG1);
		break;
	case MIPI_DSI_FMT_RGB565:
		fmt = RGB565_TO_RGB565;
		regmap_update_bits(dsi->regmap, DISPLAY_MUX,
				   MIPI_DSI_RGB565_MAP_CFG, RGB565_CONFIG1);
		break;
	}

	regmap_update_bits(dsi->regmap, DISPLAY_MUX, LCDIF_CROSS_LINE_PATTERN, fmt);

	ret = dphy_pll_init(dsi);
	if (ret < 0) {
		dev_err(dsi->dev, "failed to init phy pll: %d\n", ret);
		return ret;
	}

	ret = dphy_pll_configure(dsi, &dsi->phy_cfg);
	if (ret < 0) {
		dev_err(dsi->dev, "failed to configure phy pll: %d\n", ret);
		dphy_pll_uninit(dsi);
		return ret;
	}

	return 0;
}

static void imx93_dsi_phy_power_off(void *priv_data)
{
	struct imx93_dsi *dsi = priv_data;

	dphy_pll_power_off(dsi);
	dphy_pll_uninit(dsi);
}

static int
imx93_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
			unsigned long mode_flags, u32 lanes, u32 format,
			unsigned int *lane_mbps)
{
	struct imx93_dsi *dsi = priv_data;
	union phy_configure_opts phy_cfg;
	struct device *dev = dsi->dev;
	int ret;

	ret = imx93_dsi_get_phy_configure_opts(dsi, mode, &phy_cfg, lanes,
					       format);
	if (ret < 0) {
		dev_dbg(dev, "failed to get phy cfg opts %d\n", ret);
		return ret;
	}

	*lane_mbps = DIV_ROUND_UP(phy_cfg.mipi_dphy.hs_clk_rate, USEC_PER_SEC);

	memcpy(&dsi->phy_cfg, &phy_cfg, sizeof(phy_cfg));

	dev_dbg(dev, "get lane_mbps %u for mode " DRM_MODE_FMT "\n",
		*lane_mbps, DRM_MODE_ARG(mode));

	return 0;
}

/* High-Speed Transition Times */
struct hstt {
	unsigned int maxfreq;
	struct dw_mipi_dsi_dphy_timing timing;
};

#define HSTT(_maxfreq, _c_lp2hs, _c_hs2lp, _d_lp2hs, _d_hs2lp)	\
{								\
	.maxfreq = (_maxfreq),					\
	.timing = {						\
		.clk_lp2hs = (_c_lp2hs),			\
		.clk_hs2lp = (_c_hs2lp),			\
		.data_lp2hs = (_d_lp2hs),			\
		.data_hs2lp = (_d_hs2lp),			\
	}							\
}

/* DPHY Databook Table A-4 High-Speed Transition Times */
static const struct hstt hstt_table[] = {
	HSTT(80,    21,  17,  15, 10),
	HSTT(90,    23,  17,  16, 10),
	HSTT(100,   22,  17,  16, 10),
	HSTT(110,   25,  18,  17, 11),
	HSTT(120,   26,  20,  18, 11),
	HSTT(130,   27,  19,  19, 11),
	HSTT(140,   27,  19,  19, 11),
	HSTT(150,   28,  20,  20, 12),
	HSTT(160,   30,  21,  22, 13),
	HSTT(170,   30,  21,  23, 13),
	HSTT(180,   31,  21,  23, 13),
	HSTT(190,   32,  22,  24, 13),
	HSTT(205,   35,  22,  25, 13),
	HSTT(220,   37,  26,  27, 15),
	HSTT(235,   38,  28,  27, 16),
	HSTT(250,   41,  29,  30, 17),
	HSTT(275,   43,  29,  32, 18),
	HSTT(300,   45,  32,  35, 19),
	HSTT(325,   48,  33,  36, 18),
	HSTT(350,   51,  35,  40, 20),
	HSTT(400,   59,  37,  44, 21),
	HSTT(450,   65,  40,  49, 23),
	HSTT(500,   71,  41,  54, 24),
	HSTT(550,   77,  44,  57, 26),
	HSTT(600,   82,  46,  64, 27),
	HSTT(650,   87,  48,  67, 28),
	HSTT(700,   94,  52,  71, 29),
	HSTT(750,   99,  52,  75, 31),
	HSTT(800,  105,  55,  82, 32),
	HSTT(850,  110,  58,  85, 32),
	HSTT(900,  115,  58,  88, 35),
	HSTT(950,  120,  62,  93, 36),
	HSTT(1000, 128,  63,  99, 38),
	HSTT(1050, 132,  65, 102, 38),
	HSTT(1100, 138,  67, 106, 39),
	HSTT(1150, 146,  69, 112, 42),
	HSTT(1200, 151,  71, 117, 43),
	HSTT(1250, 153,  74, 120, 45),
	HSTT(1300, 160,  73, 124, 46),
	HSTT(1350, 165,  76, 130, 47),
	HSTT(1400, 172,  78, 134, 49),
	HSTT(1450, 177,  80, 138, 49),
	HSTT(1500, 183,  81, 143, 52),
	HSTT(1550, 191,  84, 147, 52),
	HSTT(1600, 194,  85, 152, 52),
	HSTT(1650, 201,  86, 155, 53),
	HSTT(1700, 208,  88, 161, 53),
	HSTT(1750, 212,  89, 165, 53),
	HSTT(1800, 220,  90, 171, 54),
	HSTT(1850, 223,  92, 175, 54),
	HSTT(1900, 231,  91, 180, 55),
	HSTT(1950, 236,  95, 185, 56),
	HSTT(2000, 243,  97, 190, 56),
	HSTT(2050, 248,  99, 194, 58),
	HSTT(2100, 252, 100, 199, 59),
	HSTT(2150, 259, 102, 204, 61),
	HSTT(2200, 266, 105, 210, 62),
	HSTT(2250, 269, 109, 213, 63),
	HSTT(2300, 272, 109, 217, 65),
	HSTT(2350, 281, 112, 225, 66),
	HSTT(2400, 283, 115, 226, 66),
	HSTT(2450, 282, 115, 226, 67),
	HSTT(2500, 281, 118, 227, 67),
};

static int imx93_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
				    struct dw_mipi_dsi_dphy_timing *timing)
{
	struct imx93_dsi *dsi = priv_data;
	struct device *dev = dsi->dev;
	int i;

	for (i = 0; i < ARRAY_SIZE(hstt_table); i++)
		if (lane_mbps <= hstt_table[i].maxfreq)
			break;

	if (i == ARRAY_SIZE(hstt_table)) {
		dev_err(dev, "failed to get phy timing for lane_mbps %u\n",
			lane_mbps);
		return -EINVAL;
	}

	*timing = hstt_table[i].timing;

	dev_dbg(dev, "get phy timing for %u <= %u (lane_mbps)\n",
		lane_mbps, hstt_table[i].maxfreq);

	return 0;
}

static const struct dw_mipi_dsi_phy_ops imx93_dsi_phy_ops = {
	.init = imx93_dsi_phy_init,
	.power_off = imx93_dsi_phy_power_off,
	.get_lane_mbps = imx93_dsi_get_lane_mbps,
	.get_timing = imx93_dsi_phy_get_timing,
};

static int imx93_dsi_host_attach(void *priv_data, struct mipi_dsi_device *device)
{
	struct imx93_dsi *dsi = priv_data;

	dsi->format = device->format;

	return 0;
}

static const struct dw_mipi_dsi_host_ops imx93_dsi_host_ops = {
	.attach = imx93_dsi_host_attach,
};

static int imx93_dsi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct imx93_dsi *dsi;
	int ret;

	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
	if (!dsi)
		return -ENOMEM;

	dsi->regmap = syscon_regmap_lookup_by_phandle(np, "fsl,media-blk-ctrl");
	if (IS_ERR(dsi->regmap)) {
		ret = PTR_ERR(dsi->regmap);
		dev_err(dev, "failed to get block ctrl regmap: %d\n", ret);
		return ret;
	}

	dsi->clk_pixel = devm_clk_get(dev, "pix");
	if (IS_ERR(dsi->clk_pixel))
		return dev_err_probe(dev, PTR_ERR(dsi->clk_pixel),
				     "failed to get pixel clock\n");

	dsi->clk_cfg = devm_clk_get(dev, "phy_cfg");
	if (IS_ERR(dsi->clk_cfg))
		return dev_err_probe(dev, PTR_ERR(dsi->clk_cfg),
				     "failed to get phy cfg clock\n");

	dsi->clk_ref = devm_clk_get(dev, "phy_ref");
	if (IS_ERR(dsi->clk_ref))
		return dev_err_probe(dev, PTR_ERR(dsi->clk_ref),
				     "failed to get phy ref clock\n");

	dsi->ref_clk_rate = clk_get_rate(dsi->clk_ref);
	if (dsi->ref_clk_rate < REF_CLK_RATE_MIN ||
	    dsi->ref_clk_rate > REF_CLK_RATE_MAX) {
		dev_err(dev, "invalid phy ref clock rate %lu\n",
			dsi->ref_clk_rate);
		return -EINVAL;
	}
	dev_dbg(dev, "phy ref clock rate: %lu\n", dsi->ref_clk_rate);

	dsi->dev = dev;
	dsi->pdata.max_data_lanes = 4;
	dsi->pdata.mode_valid = imx93_dsi_mode_valid;
	dsi->pdata.mode_fixup = imx93_dsi_mode_fixup;
	dsi->pdata.get_input_bus_fmts = imx93_dsi_get_input_bus_fmts;
	dsi->pdata.phy_ops = &imx93_dsi_phy_ops;
	dsi->pdata.host_ops = &imx93_dsi_host_ops;
	dsi->pdata.priv_data = dsi;
	platform_set_drvdata(pdev, dsi);

	dsi->dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata);
	if (IS_ERR(dsi->dmd))
		return dev_err_probe(dev, PTR_ERR(dsi->dmd),
				     "failed to probe dw_mipi_dsi\n");

	return 0;
}

static void imx93_dsi_remove(struct platform_device *pdev)
{
	struct imx93_dsi *dsi = platform_get_drvdata(pdev);

	dw_mipi_dsi_remove(dsi->dmd);
}

static const struct of_device_id imx93_dsi_dt_ids[] = {
	{ .compatible = "fsl,imx93-mipi-dsi", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx93_dsi_dt_ids);

static struct platform_driver imx93_dsi_driver = {
	.probe	= imx93_dsi_probe,
	.remove = imx93_dsi_remove,
	.driver	= {
		.of_match_table = imx93_dsi_dt_ids,
		.name = "imx93_mipi_dsi",
	},
};
module_platform_driver(imx93_dsi_driver);

MODULE_DESCRIPTION("Freescale i.MX93 MIPI DSI driver");
MODULE_AUTHOR("Liu Ying <[email protected]>");
MODULE_LICENSE("GPL");