drivers: drm: panel: Add ILITEK ili7807-fdhplus panel driver

drivers/gpu/drm/panel/Kconfig

@@ -638,4 +638,13 @@ config DRM_PANEL_FT8716_FHD
 	help
 	  Say Y here if you want to enable support for the FOCAL
 	  FT8716 controller for 1080x1920 LCD panels (found on Xiaomi Mi A1).
+
+config DRM_PANEL_ILI7807_FHDPLUS
+	tristate "EBBG ili7807(ilitek) panel driver"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the ILITEK
+	  ILI7807 controller for 1080x2280 LCD panels (found on Xiaomi Mi A2 Lite).
 endmenu

drivers/gpu/drm/panel/Makefile

@@ -69,3 +69,4 @@ obj-$(CONFIG_DRM_PANELS_XIAOMI_MIDO) +=panels-xiaomi-mido.o
 obj-$(CONFIG_DRM_PANEL_ILI7807_FHD) += panel-ili7807-fhd.o
 obj-$(CONFIG_DRM_PANEL_OTM1911_FHD) += panel-otm1911-fhd.o
 obj-$(CONFIG_DRM_PANEL_FT8716_FHD) += panel-ft8716-fhd.o
+obj-$(CONFIG_DRM_PANEL_ILI7807_FHDPLUS) += panel-ili7807-fhdplus.o

drivers/gpu/drm/panel/panel-ili7807-fhdplus.c

@@ -0,0 +1,270 @@
+// SPDX-License-Identifier: GPL-2.0 or later
+
+#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>
+
+struct ili7807_fhdplus {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data supplies[2];
+	struct gpio_desc *reset_gpio;
+	bool prepared;
+};
+
+static inline
+struct ili7807_fhdplus *to_ili7807_fhdplus(struct drm_panel *panel)
+{
+	return container_of(panel, struct ili7807_fhdplus, panel);
+}
+
+#define dsi_dcs_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static void ili7807_fhdplus_reset(struct ili7807_fhdplus *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(2000, 3000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(2000, 3000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+}
+
+static int ili7807_fhdplus_on(struct ili7807_fhdplus *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi_dcs_write_seq(dsi, 0xff, 0x78, 0x07, 0x00);
+	dsi_dcs_write_seq(dsi, 0x11, 0x00);
+	msleep(120);
+	dsi_dcs_write_seq(dsi, 0xff, 0x78, 0x07, 0x07);
+	dsi_dcs_write_seq(dsi, 0x12, 0x22);
+	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PARTIAL_COLUMNS, 0x0f);
+	dsi_dcs_write_seq(dsi, 0x44, 0x07);
+	dsi_dcs_write_seq(dsi, 0xff, 0x78, 0x07, 0x05);
+	dsi_dcs_write_seq(dsi, 0x00, 0x25);
+	dsi_dcs_write_seq(dsi, 0x03, 0x40);
+	dsi_dcs_write_seq(dsi, 0x04, 0x00);
+	dsi_dcs_write_seq(dsi, 0xff, 0x78, 0x07, 0x00);
+
+	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0xfc0f);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display brightness: %d\n", ret);
+		return ret;
+	}
+
+	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x2c);
+	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+
+	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear on: %d\n", ret);
+		return ret;
+	}
+
+	dsi_dcs_write_seq(dsi, 0x29, 0x00);
+	msleep(20);
+
+	return 0;
+}
+
+static int ili7807_fhdplus_off(struct ili7807_fhdplus *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+
+	dsi_dcs_write_seq(dsi, 0xff, 0x78, 0x07, 0x00);
+	dsi_dcs_write_seq(dsi, 0x28, 0x00);
+	msleep(20);
+	dsi_dcs_write_seq(dsi, 0x10, 0x00);
+	msleep(120);
+
+	return 0;
+}
+
+static int ili7807_fhdplus_prepare(struct drm_panel *panel)
+{
+	struct ili7807_fhdplus *ctx = to_ili7807_fhdplus(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	ili7807_fhdplus_reset(ctx);
+
+	ret = ili7807_fhdplus_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+		return ret;
+	}
+
+	ctx->prepared = true;
+	return 0;
+}
+
+static int ili7807_fhdplus_unprepare(struct drm_panel *panel)
+{
+	struct ili7807_fhdplus *ctx = to_ili7807_fhdplus(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ret = ili7807_fhdplus_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+	ctx->prepared = false;
+	return 0;
+}
+
+static const struct drm_display_mode ili7807_fhdplus_mode = {
+	.clock = (1080 + 72 + 8 + 64) * (2280 + 10 + 8 + 10) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 72,
+	.hsync_end = 1080 + 72 + 8,
+	.htotal = 1080 + 72 + 8 + 64,
+	.vdisplay = 2280,
+	.vsync_start = 2280 + 10,
+	.vsync_end = 2280 + 10 + 8,
+	.vtotal = 2280 + 10 + 8 + 10,
+	.width_mm = 69,
+	.height_mm = 122,
+};
+
+static int ili7807_fhdplus_get_modes(struct drm_panel *panel,
+				     struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &ili7807_fhdplus_mode);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs ili7807_fhdplus_panel_funcs = {
+	.prepare = ili7807_fhdplus_prepare,
+	.unprepare = ili7807_fhdplus_unprepare,
+	.get_modes = ili7807_fhdplus_get_modes,
+};
+
+static int ili7807_fhdplus_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct ili7807_fhdplus *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->supplies[0].supply = "vsn";
+	ctx->supplies[1].supply = "vsp";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->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 | MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_MODE_VIDEO_HSE |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;
+
+	drm_panel_init(&ctx->panel, dev, &ili7807_fhdplus_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	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 = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+		drm_panel_remove(&ctx->panel);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ili7807_fhdplus_remove(struct mipi_dsi_device *dsi)
+{
+	struct ili7807_fhdplus *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+
+	return 0;
+}
+
+static const struct of_device_id ili7807_fhdplus_of_match[] = {
+	{ .compatible = "mdss,ili7807-fhdplus" }, // FIXME
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ili7807_fhdplus_of_match);
+
+static struct mipi_dsi_driver ili7807_fhdplus_driver = {
+	.probe = ili7807_fhdplus_probe,
+	.remove = ili7807_fhdplus_remove,
+	.driver = {
+		.name = "panel-ili7807-fhdplus",
+		.of_match_table = ili7807_fhdplus_of_match,
+	},
+};
+module_mipi_dsi_driver(ili7807_fhdplus_driver);
+
+MODULE_AUTHOR("Petr Blaha <petr.blaha@cleverdata.cz>");
+MODULE_DESCRIPTION("DRM driver for ili7807 fhdplus video mode dsi panel");
+MODULE_LICENSE("GPL v2 or later");