drm/panel: introduce ebbg,ft8719 panel

Add DRM panel driver for EBBG FT8719 6.18" 2246x1080 DSI video mode
panel, which can be found on some Xiaomi Poco F1 phones. The panel's
backlight is managed through QCOM WLED driver.

Signed-off-by: Joel Selvaraj <jo@jsfamily.in>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/BY5PR02MB7009B6FA7F17A3DA36DDA44CD9DF9@BY5PR02MB7009.namprd02.prod.outlook.com

1 files changed, 285 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/panel-ebbg-ft8719.c b/drivers/gpu/drm/panel/panel-ebbg-ft8719.c
new file mode 100644
index 000000000000..386f8321b930
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ebbg-ft8719.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Joel Selvaraj <jo@jsfamily.in>
+ * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+static const char * const regulator_names[] = {
+	"vddio",
+	"vddpos",
+	"vddneg",
+};
+
+static const unsigned long regulator_enable_loads[] = {
+	62000,
+	100000,
+	100000
+};
+
+struct ebbg_ft8719 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+
+	struct gpio_desc *reset_gpio;
+};
+
+static inline
+struct ebbg_ft8719 *to_ebbg_ft8719(struct drm_panel *panel)
+{
+	return container_of(panel, struct ebbg_ft8719, panel);
+}
+
+static void ebbg_ft8719_reset(struct ebbg_ft8719 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(4000, 5000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(1000, 2000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(15000, 16000);
+}
+
+static int ebbg_ft8719_on(struct ebbg_ft8719 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x00ff);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display brightness: %d\n", ret);
+		return ret;
+	}
+
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x24);
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(90);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ebbg_ft8719_off(struct ebbg_ft8719 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		return ret;
+	}
+	usleep_range(10000, 11000);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(90);
+
+	return 0;
+}
+
+static int ebbg_ft8719_prepare(struct drm_panel *panel)
+{
+	struct ebbg_ft8719 *ctx = to_ebbg_ft8719(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	ebbg_ft8719_reset(ctx);
+
+	ret = ebbg_ft8719_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ebbg_ft8719_unprepare(struct drm_panel *panel)
+{
+	struct ebbg_ft8719 *ctx = to_ebbg_ft8719(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	ret = ebbg_ft8719_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret)
+		dev_err(panel->dev, "Failed to disable regulators: %d\n", ret);
+
+	return 0;
+}
+
+static const struct drm_display_mode ebbg_ft8719_mode = {
+	.clock = (1080 + 28 + 4 + 16) * (2246 + 120 + 4 + 12) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 28,
+	.hsync_end = 1080 + 28 + 4,
+	.htotal = 1080 + 28 + 4 + 16,
+	.vdisplay = 2246,
+	.vsync_start = 2246 + 120,
+	.vsync_end = 2246 + 120 + 4,
+	.vtotal = 2246 + 120 + 4 + 12,
+	.width_mm = 68,
+	.height_mm = 141,
+};
+
+static int ebbg_ft8719_get_modes(struct drm_panel *panel,
+				     struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &ebbg_ft8719_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 ebbg_ft8719_panel_funcs = {
+	.prepare = ebbg_ft8719_prepare,
+	.unprepare = ebbg_ft8719_unprepare,
+	.get_modes = ebbg_ft8719_get_modes,
+};
+
+static int ebbg_ft8719_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct ebbg_ft8719 *ctx;
+	int i, ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
+		ctx->supplies[i].supply = regulator_names[i];
+
+	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");
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
+		ret = regulator_set_load(ctx->supplies[i].consumer,
+						regulator_enable_loads[i]);
+		if (ret)
+			return dev_err_probe(dev, ret,
+						 "Failed to set regulator load\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_CLOCK_NON_CONTINUOUS;
+
+	drm_panel_init(&ctx->panel, dev, &ebbg_ft8719_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 ebbg_ft8719_remove(struct mipi_dsi_device *dsi)
+{
+	struct ebbg_ft8719 *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 ebbg_ft8719_of_match[] = {
+	{ .compatible = "ebbg,ft8719" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ebbg_ft8719_of_match);
+
+static struct mipi_dsi_driver ebbg_ft8719_driver = {
+	.probe = ebbg_ft8719_probe,
+	.remove = ebbg_ft8719_remove,
+	.driver = {
+		.name = "panel-ebbg-ft8719",
+		.of_match_table = ebbg_ft8719_of_match,
+	},
+};
+module_mipi_dsi_driver(ebbg_ft8719_driver);
+
+MODULE_AUTHOR("Joel Selvaraj <jo@jsfamily.in>");
+MODULE_DESCRIPTION("DRM driver for EBBG FT8719 video dsi panel");
+MODULE_LICENSE("GPL v2");