From bd07dbb929f6c5bbda60d52a0003246e53f48c29 Mon Sep 17 00:00:00 2001
From: Danila Tikhonov <danila@jiaxyga.com>
Date: Mon, 30 Sep 2024 23:24:48 +0300
Subject: [PATCH] drm/panel: Add Samsung AMS639RQ08 panel driver

Add the driver for Samsung AMS639RQ08 FHD Plus CMD mode panel support
found in:
- Xiaomi Mi 9 Lite / CC9 (sdm710-xiaomi-pyxis)
- Xiaomi Mi 9T / Redmi K20 (sm7150-xiaomi-davinci)
- Xiaomi Mi 9T Pro / Redmi K20 Pro (sm8150-xiaomi-raphael)

Tested-by: Degdag Mohamed <degdagmohamed@gmail.com> # xiaomi-raphael
Tested-by: Jens Reidel <adrian@travitia.xyz> # xiaomi-davinci
Signed-off-by: Danila Tikhonov <danila@jiaxyga.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240930202448.188051-3-danila@jiaxyga.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240930202448.188051-3-danila@jiaxyga.com
---
 drivers/gpu/drm/panel/Kconfig                 |   9 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-samsung-ams639rq08.c  | 329 ++++++++++++++++++
 3 files changed, 339 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-samsung-ams639rq08.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 7d3c9cbfe8357..ddfaa99ea9dd2 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -614,6 +614,15 @@ config DRM_PANEL_RONBO_RB070D30
 	  Say Y here if you want to enable support for Ronbo Electronics
 	  RB070D30 1024x600 DSI panel.
 
+config DRM_PANEL_SAMSUNG_AMS639RQ08
+	tristate "Samsung AMS639RQ08 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y or M here if you want to enable support for the
+	  Samsung AMS639RQ08 FHD Plus (2340x1080@60Hz) CMD mode panel.
+
 config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01
 	tristate "Samsung AMS452EF01 panel with S6E88A0 DSI video mode controller"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 8ee28f5a22138..4b5eaf1116762 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o
 obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_AMS639RQ08) += panel-samsung-ams639rq08.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-ams639rq08.c b/drivers/gpu/drm/panel/panel-samsung-ams639rq08.c
new file mode 100644
index 0000000000000..817365cb5e461
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-ams639rq08.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024, Danila Tikhonov <danila@jiaxyga.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+/* Manufacturer Command Set */
+#define MCS_ACCESS_PROT_OFF	0xb0
+#define MCS_UNKNOWN_B7		0xb7
+#define MCS_BIAS_CURRENT_CTRL	0xd1
+#define MCS_PASSWD1		0xf0
+#define MCS_PASSWD2		0xfc
+#define MCS_UNKNOWN_FF		0xff
+
+struct ams639rq08 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data *supplies;
+};
+
+static const struct regulator_bulk_data ams639rq08_supplies[] = {
+	{ .supply = "vdd3p3" },
+	{ .supply = "vddio" },
+	{ .supply = "vsn" },
+	{ .supply = "vsp" },
+};
+
+static inline struct ams639rq08 *to_ams639rq08(struct drm_panel *panel)
+{
+	return container_of(panel, struct ams639rq08, panel);
+}
+
+static void ams639rq08_reset(struct ams639rq08 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(1000, 2000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+}
+
+static int ams639rq08_on(struct ams639rq08 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+	/* Delay 2ms for VCI1 power */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD1, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD2, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x0c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_UNKNOWN_FF, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x2f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_BIAS_CURRENT_CTRL, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD1, 0xa5, 0xa5);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD2, 0xa5, 0xa5);
+
+	/* Sleep Out */
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	usleep_range(10000, 11000);
+
+	/* TE OUT (Vsync On) */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD1, 0x5a, 0x5a);
+
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+
+	/* DBV Smooth Transition */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_UNKNOWN_B7, 0x01, 0x4b);
+
+	/* Edge Dimming Speed Setting */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_UNKNOWN_B7, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD1, 0xa5, 0xa5);
+
+	/* Page Address Set */
+	mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x0923);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD1, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD2, 0x5a, 0x5a);
+
+	/* Set DDIC internal HFP */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x23);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_BIAS_CURRENT_CTRL, 0x11);
+
+	/* OFC Setting 84.1 Mhz */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe9, 0x11, 0x55,
+					       0xa6, 0x75, 0xa3,
+					       0xb9, 0xa1, 0x4a,
+					       0x00, 0x1a, 0xb8);
+
+	/* Err_FG Setting */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe1,
+					       0x00, 0x00, 0x02,
+					       0x02, 0x42, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe2,
+					       0x00, 0x00, 0x00,
+					       0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x0c);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe1, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD1, 0xa5, 0xa5);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD2, 0xa5, 0xa5);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
+
+	/* Brightness Control */
+	mipi_dsi_dcs_set_display_brightness_multi(&dsi_ctx, 0x0000);
+
+	/* Display On */
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+	mipi_dsi_msleep(&dsi_ctx, 67);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static void ams639rq08_off(struct ams639rq08 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
+}
+
+static int ams639rq08_prepare(struct drm_panel *panel)
+{
+	struct ams639rq08 *ctx = to_ams639rq08(panel);
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ams639rq08_supplies),
+				    ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	ams639rq08_reset(ctx);
+
+	ret = ams639rq08_on(ctx);
+	if (ret < 0) {
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		regulator_bulk_disable(ARRAY_SIZE(ams639rq08_supplies),
+				       ctx->supplies);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ams639rq08_unprepare(struct drm_panel *panel)
+{
+	struct ams639rq08 *ctx = to_ams639rq08(panel);
+
+	ams639rq08_off(ctx);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ams639rq08_supplies),
+			       ctx->supplies);
+
+	return 0;
+}
+
+static const struct drm_display_mode ams639rq08_mode = {
+	.clock = (1080 + 64 + 20 + 64) * (2340 + 64 + 20 + 64) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 64,
+	.hsync_end = 1080 + 64 + 20,
+	.htotal = 1080 + 64 + 20 + 64,
+	.vdisplay = 2340,
+	.vsync_start = 2340 + 64,
+	.vsync_end = 2340 + 64 + 20,
+	.vtotal = 2340 + 64 + 20 + 64,
+	.width_mm = 68,
+	.height_mm = 147,
+	.type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int ams639rq08_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &ams639rq08_mode);
+}
+
+static const struct drm_panel_funcs ams639rq08_panel_funcs = {
+	.prepare = ams639rq08_prepare,
+	.unprepare = ams639rq08_unprepare,
+	.get_modes = ams639rq08_get_modes,
+};
+
+static int ams639rq08_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int ams639rq08_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return brightness;
+}
+
+static const struct backlight_ops ams639rq08_bl_ops = {
+	.update_status = ams639rq08_bl_update_status,
+	.get_brightness = ams639rq08_bl_get_brightness,
+};
+
+static struct backlight_device *
+ams639rq08_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 1023,
+		.max_brightness = 2047,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+						&ams639rq08_bl_ops, &props);
+}
+
+static int ams639rq08_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct ams639rq08 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ret = devm_regulator_bulk_get_const(&dsi->dev,
+					    ARRAY_SIZE(ams639rq08_supplies),
+					    ams639rq08_supplies,
+					    &ctx->supplies);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+					"Failed to get reset-gpios\n");
+
+	ctx->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;
+
+	drm_panel_init(&ctx->panel, dev, &ams639rq08_panel_funcs,
+			DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = true;
+
+	ctx->panel.backlight = ams639rq08_create_backlight(dsi);
+	if (IS_ERR(ctx->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+					"Failed to create backlight\n");
+
+	drm_panel_add(&ctx->panel);
+
+	ret = devm_mipi_dsi_attach(dev, dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void ams639rq08_remove(struct mipi_dsi_device *dsi)
+{
+	struct ams639rq08 *ctx = mipi_dsi_get_drvdata(dsi);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id ams639rq08_of_match[] = {
+	{ .compatible = "samsung,ams639rq08" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ams639rq08_of_match);
+
+static struct mipi_dsi_driver ams639rq08_driver = {
+	.probe = ams639rq08_probe,
+	.remove = ams639rq08_remove,
+	.driver = {
+		.name = "panel-samsung-ams639rq08",
+		.of_match_table = ams639rq08_of_match,
+	},
+};
+module_mipi_dsi_driver(ams639rq08_driver);
+
+MODULE_AUTHOR("Danila Tikhonov <danila@jiaxyga.com>");
+MODULE_DESCRIPTION("DRM driver for SAMSUNG AMS639RQ08 cmd mode dsi panel");
+MODULE_LICENSE("GPL");