drm/panel: Add Ronbo RB070D30 panel

The Ronbo RB070D30 panel is a MIPI-DSI panel based on a Fitipower EK79007
controller and a 1024x600 panel.

Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Konstantin Sudakov <k.sudakov@integrasources.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/3cc43c6051e89a52434053a38a36621acab7236e.1550650810.git-series.maxime.ripard@bootlin.com

drivers/gpu/drm/panel/Kconfig

@@ -149,6 +149,15 @@ config DRM_PANEL_RAYDIUM_RM68200
 	  Say Y here if you want to enable support for Raydium RM68200
 	  720x1280 DSI video mode panel.
 
+config DRM_PANEL_RONBO_RB070D30
+	tristate "Ronbo Electronics RB070D30 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for Ronbo Electronics
+	  RB070D30 1024x600 DSI panel.
+
 config DRM_PANEL_SAMSUNG_S6D16D0
 	tristate "Samsung S6D16D0 DSI video mode panel"
 	depends on OF

drivers/gpu/drm/panel/Makefile

@@ -13,6 +13,7 @@ obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
 obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
 obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
+obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o

drivers/gpu/drm/panel/panel-ronbo-rb070d30.c

@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018-2019, Bridge Systems BV
+ * Copyright (C) 2018-2019, Bootlin
+ * Copyright (C) 2017, Free Electrons
+ *
+ * This file based on panel-ilitek-ili9881c.c
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+#include <linux/media-bus-format.h>
+#include <linux/module.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+struct rb070d30_panel {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct backlight_device *backlight;
+	struct regulator *supply;
+
+	struct {
+		struct gpio_desc *power;
+		struct gpio_desc *reset;
+		struct gpio_desc *updn;
+		struct gpio_desc *shlr;
+	} gpios;
+};
+
+static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct rb070d30_panel, panel);
+}
+
+static int rb070d30_panel_prepare(struct drm_panel *panel)
+{
+	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
+	int ret;
+
+	ret = regulator_enable(ctx->supply);
+	if (ret < 0) {
+		DRM_DEV_ERROR(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret);
+		return ret;
+	}
+
+	msleep(20);
+	gpiod_set_value(ctx->gpios.power, 1);
+	msleep(20);
+	gpiod_set_value(ctx->gpios.reset, 1);
+	msleep(20);
+	return 0;
+}
+
+static int rb070d30_panel_unprepare(struct drm_panel *panel)
+{
+	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
+
+	gpiod_set_value(ctx->gpios.reset, 0);
+	gpiod_set_value(ctx->gpios.power, 0);
+	regulator_disable(ctx->supply);
+
+	return 0;
+}
+
+static int rb070d30_panel_enable(struct drm_panel *panel)
+{
+	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
+	int ret;
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
+	if (ret)
+		return ret;
+
+	ret = backlight_enable(ctx->backlight);
+	if (ret)
+		goto out;
+
+	return 0;
+
+out:
+	mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
+	return ret;
+}
+
+static int rb070d30_panel_disable(struct drm_panel *panel)
+{
+	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
+
+	backlight_disable(ctx->backlight);
+	return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
+}
+
+/* Default timings */
+static const struct drm_display_mode default_mode = {
+	.clock		= 51206,
+	.hdisplay	= 1024,
+	.hsync_start	= 1024 + 160,
+	.hsync_end	= 1024 + 160 + 80,
+	.htotal		= 1024 + 160 + 80 + 80,
+	.vdisplay	= 600,
+	.vsync_start	= 600 + 12,
+	.vsync_end	= 600 + 12 + 10,
+	.vtotal		= 600 + 12 + 10 + 13,
+	.vrefresh	= 60,
+
+	.width_mm	= 154,
+	.height_mm	= 85,
+};
+
+static int rb070d30_panel_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
+	struct drm_display_mode *mode;
+	static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+
+	mode = drm_mode_duplicate(panel->drm, &default_mode);
+	if (!mode) {
+		DRM_DEV_ERROR(&ctx->dsi->dev,
+			      "Failed to add mode " DRM_MODE_FMT "\n",
+			      DRM_MODE_ARG(&default_mode));
+		return -EINVAL;
+	}
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+
+	panel->connector->display_info.bpc = 8;
+	panel->connector->display_info.width_mm = mode->width_mm;
+	panel->connector->display_info.height_mm = mode->height_mm;
+	drm_display_info_set_bus_formats(&connector->display_info,
+					 &bus_format, 1);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs rb070d30_panel_funcs = {
+	.get_modes	= rb070d30_panel_get_modes,
+	.prepare	= rb070d30_panel_prepare,
+	.enable		= rb070d30_panel_enable,
+	.disable	= rb070d30_panel_disable,
+	.unprepare	= rb070d30_panel_unprepare,
+};
+
+static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
+{
+	struct rb070d30_panel *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
+	if (IS_ERR(ctx->supply))
+		return PTR_ERR(ctx->supply);
+
+	mipi_dsi_set_drvdata(dsi, ctx);
+	ctx->dsi = dsi;
+
+	drm_panel_init(&ctx->panel);
+	ctx->panel.dev = &dsi->dev;
+	ctx->panel.funcs = &rb070d30_panel_funcs;
+
+	ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->gpios.reset)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
+		return PTR_ERR(ctx->gpios.reset);
+	}
+
+	ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->gpios.power)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n");
+		return PTR_ERR(ctx->gpios.power);
+	}
+
+	/*
+	 * We don't change the state of that GPIO later on but we need
+	 * to force it into a low state.
+	 */
+	ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->gpios.updn)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n");
+		return PTR_ERR(ctx->gpios.updn);
+	}
+
+	/*
+	 * We don't change the state of that GPIO later on but we need
+	 * to force it into a low state.
+	 */
+	ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->gpios.shlr)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n");
+		return PTR_ERR(ctx->gpios.shlr);
+	}
+
+	ctx->backlight = devm_of_find_backlight(&dsi->dev);
+	if (IS_ERR(ctx->backlight)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our backlight\n");
+		return PTR_ERR(ctx->backlight);
+	}
+
+	ret = drm_panel_add(&ctx->panel);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->lanes = 4;
+
+	return mipi_dsi_attach(dsi);
+}
+
+static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
+{
+	struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_panel_remove(&ctx->panel);
+
+	return 0;
+}
+
+static const struct of_device_id rb070d30_panel_of_match[] = {
+	{ .compatible = "ronbo,rb070d30" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);
+
+static struct mipi_dsi_driver rb070d30_panel_driver = {
+	.probe = rb070d30_panel_dsi_probe,
+	.remove = rb070d30_panel_dsi_remove,
+	.driver = {
+		.name = "panel-ronbo-rb070d30",
+		.of_match_table	= rb070d30_panel_of_match,
+	},
+};
+module_mipi_dsi_driver(rb070d30_panel_driver);
+
+MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
+MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>");
+MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver");
+MODULE_LICENSE("GPL");