gpu/drm: panel: add Samsung LTL106HL02 MIPI DSI panel driver

LTL106HL02 is a color active matrix TFT (Thin Film Transistor) liquid
crystal display (LCD) that uses amorphous silicon TFT as switching
devices. This model is composed of a TFT LCD panel, a driver circuit and a
backlight unit. The resolution of a 10.6" contains 1920 x 1080 pixels and
can display up to 16,8M color with wide viewing angle.

Signed-off-by: Jonas Schwöbel <[e-mail]>
Signed-off-by: Anton Bambura <[e-mail]>
Signed-off-by: Svyatoslav Ryhel <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/gpu/drm/panel/Kconfig

···
 	depends on BACKLIGHT_CLASS_DEVICE
 	select VIDEOMODE_HELPERS
 
+config DRM_PANEL_SAMSUNG_LTL106HL02
+	tristate "Samsung LTL106HL02 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+	help
+	  Say Y here if you want to enable support for the Samsung LTL106HL02
+	  panel driver which is used in Microsoft Surface 2.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called panel-samsung-ltl106hl02.
+
 config DRM_PANEL_SAMSUNG_S6E3FA7
 	tristate "Samsung S6E3FA7 panel driver"
 	depends on OF

drivers/gpu/drm/panel/Makefile

···
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_LTL106HL02) += panel-samsung-ltl106hl02.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D27A1) += panel-samsung-s6d27a1.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D7AA0) += panel-samsung-s6d7aa0.o

drivers/gpu/drm/panel/panel-samsung-ltl106hl02.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/array_size.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.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>
+
+struct samsung_ltl106hl02 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+
+	struct regulator *supply;
+	struct gpio_desc *reset_gpio;
+};
+
+static inline struct samsung_ltl106hl02 *to_samsung_ltl106hl02(struct drm_panel *panel)
+{
+	return container_of(panel, struct samsung_ltl106hl02, panel);
+}
+
+static void samsung_ltl106hl02_reset(struct samsung_ltl106hl02 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(2000, 3000);
+}
+
+static int samsung_ltl106hl02_prepare(struct drm_panel *panel)
+{
+	struct samsung_ltl106hl02 *ctx = to_samsung_ltl106hl02(panel);
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = regulator_enable(ctx->supply);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable power supply %d\n", ret);
+		return ret;
+	}
+
+	if (ctx->reset_gpio)
+		samsung_ltl106hl02_reset(ctx);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 70);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 5);
+
+	return dsi_ctx.accum_err;
+}
+
+static int samsung_ltl106hl02_unprepare(struct drm_panel *panel)
+{
+	struct samsung_ltl106hl02 *ctx = to_samsung_ltl106hl02(panel);
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 150);
+
+	if (ctx->reset_gpio)
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	regulator_disable(ctx->supply);
+
+	return 0;
+}
+
+static const struct drm_display_mode samsung_ltl106hl02_mode = {
+	.clock = (1920 + 32 + 32 + 64) * (1080 + 6 + 3 + 22) * 60 / 1000,
+	.hdisplay = 1920,
+	.hsync_start = 1920 + 32,
+	.hsync_end = 1920 + 32 + 32,
+	.htotal = 1920 + 32 + 32 + 64,
+	.vdisplay = 1080,
+	.vsync_start = 1080 + 6,
+	.vsync_end = 1080 + 6 + 3,
+	.vtotal = 1080 + 6 + 3 + 22,
+	.width_mm = 235,
+	.height_mm = 132,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static int samsung_ltl106hl02_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &samsung_ltl106hl02_mode);
+}
+
+static const struct drm_panel_funcs samsung_ltl106hl02_panel_funcs = {
+	.prepare = samsung_ltl106hl02_prepare,
+	.unprepare = samsung_ltl106hl02_unprepare,
+	.get_modes = samsung_ltl106hl02_get_modes,
+};
+
+static int samsung_ltl106hl02_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct samsung_ltl106hl02 *ctx;
+	int ret;
+
+	ctx = devm_drm_panel_alloc(dev, struct samsung_ltl106hl02, panel,
+				   &samsung_ltl106hl02_panel_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ctx->supply = devm_regulator_get(dev, "power");
+	if (IS_ERR(ctx->supply))
+		return dev_err_probe(dev, PTR_ERR(ctx->supply),
+				     "Failed to get power regulator\n");
+
+	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	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 | MIPI_DSI_MODE_LPM;
+
+	ret = drm_panel_of_backlight(&ctx->panel);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get 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 samsung_ltl106hl02_remove(struct mipi_dsi_device *dsi)
+{
+	struct samsung_ltl106hl02 *ctx = mipi_dsi_get_drvdata(dsi);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id samsung_ltl106hl02_of_match[] = {
+	{ .compatible = "samsung,ltl106hl02-001" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, samsung_ltl106hl02_of_match);
+
+static struct mipi_dsi_driver samsung_ltl106hl02_driver = {
+	.driver = {
+		.name = "panel-samsung-ltl106hl02",
+		.of_match_table = samsung_ltl106hl02_of_match,
+	},
+	.probe = samsung_ltl106hl02_probe,
+	.remove = samsung_ltl106hl02_remove,
+};
+module_mipi_dsi_driver(samsung_ltl106hl02_driver);
+
+MODULE_AUTHOR("Anton Bambura <[e-mail]>");
+MODULE_DESCRIPTION("DRM driver for Samsung LTL106HL02 video mode DSI panel");
+MODULE_LICENSE("GPL");