U-Boot

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2025 Ion Agorria <ion@agorria.com>
 */

#include <backlight.h>
#include <dm.h>
#include <panel.h>
#include <log.h>
#include <malloc.h>
#include <spi.h>
#include <mipi_display.h>
#include <linux/delay.h>
#include <power/regulator.h>
#include <asm/gpio.h>

#define S6E63M0_DCS_CMD			0
#define S6E63M0_DCS_DATA		1

#define S6E63M0_INFO_FLAG_PGAMMACTL	BIT(0)
#define S6E63M0_INFO_FLAG_GAMMA_DELTA	BIT(1)

#define S6E63M0_GTCON_FLAG_FLIP_H	BIT(0)
#define S6E63M0_GTCON_FLAG_FLIP_V	BIT(1)

/* Manufacturer Command Set */
#define MCS_PENTILE_1			0xb3
#define MCS_GAMMA_DELTA_Y_RED		0xb5
#define MCS_GAMMA_DELTA_X_RED		0xb6
#define MCS_GAMMA_DELTA_Y_GREEN		0xb7
#define MCS_GAMMA_DELTA_X_GREEN		0xb8
#define MCS_GAMMA_DELTA_Y_BLUE		0xb9
#define MCS_GAMMA_DELTA_X_BLUE		0xba
#define MCS_DISCTL			0xf2
#define MCS_SRCCTL			0xf6
#define MCS_IFCTL			0xf7
#define MCS_PANELCTL			0xf8
#define MCS_PGAMMACTL			0xfa

#define MCS_PANELCTL_LEN		14
#define MCS_IFCTL_LEN			3
#define MCS_PGAMMACTL_LEN		22
#define MCS_GAMMA_DELTA_Y_LEN		32
#define MCS_GAMMA_DELTA_X_LEN		16

struct s6e63m0_priv {
	struct udevice *vdd3;
	struct udevice *vci;

	struct s6e63m0_info *info;

	struct gpio_desc reset_gpio;

	u8 gtcon;
};

struct s6e63m0_info {
	const u32 flags;
	struct display_timing timing;
	const u8 cmd_mcs_panelctl[MCS_PANELCTL_LEN];
	const u8 cmd_mcs_pgammactl_1[MCS_PGAMMACTL_LEN];
	const u8 cmd_mcs_pgammactl_2;
	const u8 cmd_mcs_gamma_delta_y[MCS_GAMMA_DELTA_Y_LEN];
	const u8 cmd_mcs_gamma_delta_x[MCS_GAMMA_DELTA_X_LEN];
};

static const struct s6e63m0_info s6e63m0_generic_info = {
	.flags = S6E63M0_INFO_FLAG_GAMMA_DELTA,
	.timing = {
		.pixelclock.typ		= 25628,
		.hactive.typ		= 480,
		.hfront_porch.typ	= 16,
		.hback_porch.typ	= 16,
		.hsync_len.typ		= 2,
		.vactive.typ		= 800,
		.vfront_porch.typ	= 28,
		.vback_porch.typ	= 1,
		.vsync_len.typ		= 2,
		.flags			= DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
	},
	.cmd_mcs_panelctl = {
		0x01,	/* DOCT */	0x27,	/* CLWEA */
		0x27,	/* CLWEB*/	0x07,	/* CLTE */
		0x07,	/* SHE */	0x54,	/* FLTE */
		0x9F,	/* FLWE */	0x63,	/* SCTE */
		0x8F,	/* SCWE */	0x1A,	/* INTE */
		0x33,	/* INWE */	0x0D,	/* EMPS */
		0x00,	/* E_INTE */	0x00	/* E_INWE */
	},
	.cmd_mcs_pgammactl_1 = {
		0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33, 0xb6,
		0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1, 0xc1, 0xb7,
		0x00, 0x9c, 0x00, 0x9f, 0x00, 0xd6
	},
	.cmd_mcs_pgammactl_2 = 0x01,
	.cmd_mcs_gamma_delta_y = {
		0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17, 0x13,
		0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b, 0x1a, 0x17,
		0x2b, 0x26, 0x22, 0x20, 0x3a, 0x34, 0x30, 0x2c,
		0x29, 0x26, 0x25, 0x23, 0x21, 0x20, 0x1e, 0x1e
	},
	.cmd_mcs_gamma_delta_x = {
		0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44, 0x44,
		0x55, 0x55, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66
	},
};

static const struct s6e63m0_info samsung_bose_panel_info = {
	.flags = S6E63M0_INFO_FLAG_PGAMMACTL | S6E63M0_INFO_FLAG_GAMMA_DELTA,
	.timing = {
		.pixelclock.typ		= 24000000,
		.hactive.typ		= 480,
		.hfront_porch.typ	= 16,
		.hback_porch.typ	= 14,
		.hsync_len.typ		= 2,
		.vactive.typ		= 800,
		.vfront_porch.typ	= 28,
		.vback_porch.typ	= 1,
		.vsync_len.typ		= 2,
		.flags			= DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
					  DISPLAY_FLAGS_DE_LOW | DISPLAY_FLAGS_PIXDATA_NEGEDGE,
	},
	.cmd_mcs_panelctl = {
		0x01,	/* DOCT */	0x27,	/* CLWEA */
		0x27,	/* CLWEB*/	0x07,	/* CLTE */
		0x07,	/* SHE */	0x54,	/* FLTE */
		0x9F,	/* FLWE */	0x63,	/* SCTE */
		0x86,	/* SCWE */	0x1A,	/* INTE */
		0x33,	/* INWE */	0x0D,	/* EMPS */
		0x00,	/* E_INTE */	0x00	/* E_INWE */
	},
	.cmd_mcs_pgammactl_1 = {
		0x02, 0x18, 0x08, 0x24, 0x70, 0x6e, 0x4e, 0xbc,
		0xc0, 0xaf, 0xb3, 0xb8, 0xa5, 0xc5, 0xc7, 0xbb,
		0x00, 0xb9, 0x00, 0xb8, 0x00, 0xfc
	},
	.cmd_mcs_pgammactl_2 = 0x03,
	.cmd_mcs_gamma_delta_y = {
		0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17, 0x13,
		0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b, 0x1a, 0x17,
		0x2b, 0x26, 0x22, 0x20, 0x3a, 0x34, 0x30, 0x2c,
		0x29, 0x26, 0x25, 0x23, 0x21, 0x20, 0x1e, 0x1e
	},
	.cmd_mcs_gamma_delta_x = {
		0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44, 0x44,
		0x55, 0x55, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66
	},
};

static int s6e63m0_dcs_write(struct udevice *dev, u8 cmd, const u8 *seq, size_t len)
{
	int ret;
	u8 data[2];
	int i;

	data[0] = S6E63M0_DCS_CMD;
	data[1] = cmd;

	ret = dm_spi_xfer(dev, 9, &data, NULL, SPI_XFER_ONCE);
	if (ret)
		return ret;

	for (i = 0; i < len; i++) {
		data[0] = S6E63M0_DCS_DATA;
		data[1] = seq[i];

		ret = dm_spi_xfer(dev, 9, &data, NULL, SPI_XFER_ONCE);
		if (ret)
			return ret;
	}

	return 0;
}

#define s6e63m0_dcs_write_seq_static(dev, cmd, seq ...) ({	\
	static const u8 d[] = { seq };				\
	ret = s6e63m0_dcs_write(dev, cmd, d, ARRAY_SIZE(d));	\
	if (ret)						\
		return ret;					\
})

static int s6e63m0_enable_backlight(struct udevice *dev)
{
	struct s6e63m0_priv *priv = dev_get_priv(dev);
	struct s6e63m0_info *info = priv->info;
	u8 cmd_mcs_ifctl[MCS_IFCTL_LEN];
	int ret;

	ret = s6e63m0_dcs_write(dev, MCS_PANELCTL, info->cmd_mcs_panelctl, MCS_PANELCTL_LEN);
	if (ret)
		return ret;

	s6e63m0_dcs_write_seq_static(dev, MCS_DISCTL,
				     0x02,	/* Number of Line */
				     0x03,	/* VBP */
				     0x1c,	/* VFP */
				     0x10,	/* HBP */
				     0x10);	/* HFP */

	cmd_mcs_ifctl[0] = priv->gtcon;	/* GTCON */
	cmd_mcs_ifctl[1] = 0x00;	/* Display Mode */
	cmd_mcs_ifctl[2] = 0x00;	/* Vsync/Hsync, DOCCLK, RGB mode */
	ret = s6e63m0_dcs_write(dev, MCS_IFCTL, cmd_mcs_ifctl, MCS_IFCTL_LEN);
	if (ret)
		return ret;

	if (info->flags & S6E63M0_INFO_FLAG_PGAMMACTL) {
		ret = s6e63m0_dcs_write(dev, MCS_PGAMMACTL, info->cmd_mcs_pgammactl_1,
					MCS_PGAMMACTL_LEN);
		if (ret)
			return ret;

		s6e63m0_dcs_write(dev, MCS_PGAMMACTL, &info->cmd_mcs_pgammactl_2, 1);
	}

	s6e63m0_dcs_write_seq_static(dev, MCS_SRCCTL, 0x00, 0x8e, 0x07);
	s6e63m0_dcs_write_seq_static(dev, MCS_PENTILE_1, 0x6c);

	if (info->flags & S6E63M0_INFO_FLAG_GAMMA_DELTA) {
		ret = s6e63m0_dcs_write(dev, MCS_GAMMA_DELTA_Y_RED, info->cmd_mcs_gamma_delta_y,
					MCS_GAMMA_DELTA_Y_LEN);
		if (ret)
			return ret;

		ret = s6e63m0_dcs_write(dev, MCS_GAMMA_DELTA_X_RED, info->cmd_mcs_gamma_delta_x,
					MCS_GAMMA_DELTA_X_LEN);
		if (ret)
			return ret;

		ret = s6e63m0_dcs_write(dev, MCS_GAMMA_DELTA_Y_GREEN, info->cmd_mcs_gamma_delta_y,
					MCS_GAMMA_DELTA_Y_LEN);
		if (ret)
			return ret;

		ret = s6e63m0_dcs_write(dev, MCS_GAMMA_DELTA_X_GREEN, info->cmd_mcs_gamma_delta_x,
					MCS_GAMMA_DELTA_X_LEN);
		if (ret)
			return ret;

		ret = s6e63m0_dcs_write(dev, MCS_GAMMA_DELTA_Y_BLUE, info->cmd_mcs_gamma_delta_y,
					MCS_GAMMA_DELTA_Y_LEN);
		if (ret)
			return ret;

		ret = s6e63m0_dcs_write(dev, MCS_GAMMA_DELTA_X_BLUE, info->cmd_mcs_gamma_delta_x,
					MCS_GAMMA_DELTA_X_LEN);
		if (ret)
			return ret;
	}

	s6e63m0_dcs_write_seq_static(dev, MIPI_DCS_EXIT_SLEEP_MODE);
	s6e63m0_dcs_write_seq_static(dev, MIPI_DCS_SET_DISPLAY_ON);

	return 0;
}

static int s6e63m0_set_backlight(struct udevice *dev, int percent)
{
	return 0;
}

static int s6e63m0_get_display_timing(struct udevice *dev, struct display_timing *timing)
{
	struct s6e63m0_priv *priv = dev_get_priv(dev);

	memcpy(timing, &priv->info->timing, sizeof(*timing));

	return 0;
}

static int s6e63m0_of_to_plat(struct udevice *dev)
{
	struct s6e63m0_priv *priv = dev_get_priv(dev);
	int ret;

	ret = device_get_supply_regulator(dev, "vdd3-supply", &priv->vdd3);
	if (ret) {
		log_debug("%s: cannot get vdd3-supply: ret = %d\n",
			  __func__, ret);
		return ret;
	}

	ret = device_get_supply_regulator(dev, "vci-supply", &priv->vci);
	if (ret) {
		log_debug("%s: cannot get vci-supply: ret = %d\n",
			  __func__, ret);
		return ret;
	}

	ret = gpio_request_by_name(dev, "reset-gpios", 0,
				   &priv->reset_gpio, GPIOD_IS_OUT);
	if (ret) {
		log_debug("%s: cannot decode reset-gpios (%d)\n",
			  __func__, ret);
		return ret;
	}

	if (dev_read_bool(dev, "flip-horizontal"))
		priv->gtcon |= S6E63M0_GTCON_FLAG_FLIP_H;

	if (dev_read_bool(dev, "flip-vertical"))
		priv->gtcon |= S6E63M0_GTCON_FLAG_FLIP_V;

	return 0;
}

static int s6e63m0_hw_init(struct udevice *dev)
{
	struct s6e63m0_priv *priv = dev_get_priv(dev);
	int ret;

	ret = dm_gpio_set_value(&priv->reset_gpio, 1);
	if (ret) {
		log_debug("%s: error entering reset (%d)\n", __func__, ret);
		return ret;
	}

	ret = regulator_set_enable_if_allowed(priv->vdd3, 1);
	if (ret) {
		log_debug("%s: enabling vdd3-supply failed (%d)\n",
			  __func__, ret);
		return ret;
	}

	mdelay(1);

	ret = regulator_set_enable_if_allowed(priv->vci, 1);
	if (ret) {
		log_debug("%s: enabling vci-supply failed (%d)\n",
			  __func__, ret);
		return ret;
	}

	mdelay(26);

	ret = dm_gpio_set_value(&priv->reset_gpio, 0);
	if (ret) {
		log_debug("%s: error exiting reset (%d)\n", __func__, ret);
		return ret;
	}

	mdelay(10);

	return 0;
}

static int s6e63m0_probe(struct udevice *dev)
{
	struct s6e63m0_priv *priv = dev_get_priv(dev);
	struct spi_slave *slave = dev_get_parent_priv(dev);
	int ret;

	if (device_get_uclass_id(dev->parent) != UCLASS_SPI)
		return -EPROTONOSUPPORT;

	ret = spi_claim_bus(slave);
	if (ret) {
		log_err("SPI bus allocation failed (%d)\n", ret);
		return ret;
	}

	priv->info = (struct s6e63m0_info *)dev_get_driver_data(dev);

	return s6e63m0_hw_init(dev);
}

static const struct panel_ops s6e63m0_ops = {
	.enable_backlight	= s6e63m0_enable_backlight,
	.set_backlight		= s6e63m0_set_backlight,
	.get_display_timing	= s6e63m0_get_display_timing,
};

static const struct udevice_id s6e63m0_ids[] = {
	{
		.compatible = "samsung,s6e63m0",
		.data = (ulong)&s6e63m0_generic_info
	},
	{
		.compatible = "samsung,bose-panel",
		.data = (ulong)&samsung_bose_panel_info
	},
	{ }
};

U_BOOT_DRIVER(samsung_s6e63m0) = {
	.name		= "samsung_s6e63m0",
	.id		= UCLASS_PANEL,
	.of_match	= s6e63m0_ids,
	.ops		= &s6e63m0_ops,
	.of_to_plat	= s6e63m0_of_to_plat,
	.probe		= s6e63m0_probe,
	.priv_auto	= sizeof(struct s6e63m0_priv),
};