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From:   Raffaele Tranquillini <raffaele.tranquillini@gmail.com>
To:     thierry.reding@gmail.com, sam@ravnborg.org, airlied@linux.ie,
        daniel@ffwll.ch
Cc:     y.oudjana@protonmail.com, ~postmarketos/upstreaming@lists.sr.ht,
        phone-devel@vger.kernel.org,
        Raffaele Tranquillini <raffaele.tranquillini@gmail.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH 1/2] drm/panel: Add JDI R63452 MIPI DSI panel driver
Date:   Sat, 25 Sep 2021 12:29:09 +0200
Message-Id: <20210925102911.518038-1-raffaele.tranquillini@gmail.com>
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List-ID: <linux-kernel.vger.kernel.org>
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This adds support for the JDI R63452 Full HD LCD panel used on the
Xiaomi Mi 5 smartphone, in MIPI DSI command mode.

Signed-off-by: Raffaele Tranquillini <raffaele.tranquillini@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig                |   9 +
 drivers/gpu/drm/panel/Makefile               |   1 +
 drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c | 323 +++++++++++++++++++
 3 files changed, 333 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index beb581b96ecd..ea548628da86 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -177,6 +177,15 @@ config DRM_PANEL_JDI_LT070ME05000
 	  The panel has a 1200(RGB)×1920 (WUXGA) resolution and uses
 	  24 bit per pixel.
 
+config DRM_PANEL_JDI_R63452
+	tristate "JDI R63452 Full HD DSI 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 the JDI R63452
+	  DSI command mode panel as found in Xiaomi Mi 5 Devices.
+
 config DRM_PANEL_KHADAS_TS050
 	tristate "Khadas TS050 panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index c8132050bcec..6ab4072dae2d 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_EJ030NA) += panel-innolux-ej030na.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
 obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
+obj-$(CONFIG_DRM_PANEL_JDI_R63452) += panel-jdi-fhd-r63452.o
 obj-$(CONFIG_DRM_PANEL_KHADAS_TS050) += panel-khadas-ts050.o
 obj-$(CONFIG_DRM_PANEL_KINGDISPLAY_KD097D04) += panel-kingdisplay-kd097d04.o
 obj-$(CONFIG_DRM_PANEL_LEADTEK_LTK050H3146W) += panel-leadtek-ltk050h3146w.o
diff --git a/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c b/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
new file mode 100644
index 000000000000..31eafbc38ec0
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
@@ -0,0 +1,323 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 Raffaele Tranquillini <raffaele.tranquillini@gmail.com>
+ *
+ * Generated using linux-mdss-dsi-panel-driver-generator from Lineage OS device tree:
+ * https://github.com/LineageOS/android_kernel_xiaomi_msm8996/blob/lineage-18.1/arch/arm/boot/dts/qcom/a1-msm8996-mtp.dtsi
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/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>
+
+struct jdi_fhd_r63452 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct gpio_desc *reset_gpio;
+	bool prepared;
+};
+
+static inline struct jdi_fhd_r63452 *to_jdi_fhd_r63452(struct drm_panel *panel)
+{
+	return container_of(panel, struct jdi_fhd_r63452, panel);
+}
+
+#define dsi_generic_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+#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 jdi_fhd_r63452_reset(struct jdi_fhd_r63452 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+	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 jdi_fhd_r63452_on(struct jdi_fhd_r63452 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	dsi_generic_write_seq(dsi, 0xb0, 0x00);
+	dsi_generic_write_seq(dsi, 0xd6, 0x01);
+	dsi_generic_write_seq(dsi, 0xec,
+			      0x64, 0xdc, 0xec, 0x3b, 0x52, 0x00, 0x0b, 0x0b,
+			      0x13, 0x15, 0x68, 0x0b, 0xb5);
+	dsi_generic_write_seq(dsi, 0xb0, 0x03);
+
+	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, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
+
+	ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x77);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set pixel format: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_column_address(dsi, 0x0000, 0x0437);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set column address: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_page_address(dsi, 0x0000, 0x077f);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set page address: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_tear_scanline(dsi, 0x0000);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear scanline: %d\n", ret);
+		return ret;
+	}
+
+	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;
+	}
+
+	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x24);
+	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_CABC_MIN_BRIGHTNESS, 0x00);
+	dsi_dcs_write_seq(dsi, 0x84, 0x00);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+	msleep(20);
+
+	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(80);
+
+	dsi_generic_write_seq(dsi, 0xb0, 0x04);
+	dsi_dcs_write_seq(dsi, 0x84, 0x00);
+	dsi_generic_write_seq(dsi, 0xc8, 0x11);
+	dsi_generic_write_seq(dsi, 0xb0, 0x03);
+
+	return 0;
+}
+
+static int jdi_fhd_r63452_off(struct jdi_fhd_r63452 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	dsi_generic_write_seq(dsi, 0xb0, 0x00);
+	dsi_generic_write_seq(dsi, 0xd6, 0x01);
+	dsi_generic_write_seq(dsi, 0xec,
+			      0x64, 0xdc, 0xec, 0x3b, 0x52, 0x00, 0x0b, 0x0b,
+			      0x13, 0x15, 0x68, 0x0b, 0x95);
+	dsi_generic_write_seq(dsi, 0xb0, 0x03);
+
+	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(2000, 3000);
+
+	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(120);
+
+	return 0;
+}
+
+static int jdi_fhd_r63452_prepare(struct drm_panel *panel)
+{
+	struct jdi_fhd_r63452 *ctx = to_jdi_fhd_r63452(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	jdi_fhd_r63452_reset(ctx);
+
+	ret = jdi_fhd_r63452_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;
+	}
+
+	ctx->prepared = true;
+	return 0;
+}
+
+static int jdi_fhd_r63452_unprepare(struct drm_panel *panel)
+{
+	struct jdi_fhd_r63452 *ctx = to_jdi_fhd_r63452(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ret = jdi_fhd_r63452_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	ctx->prepared = false;
+	return 0;
+}
+
+static const struct drm_display_mode jdi_fhd_r63452_mode = {
+	.clock = (1080 + 120 + 16 + 40) * (1920 + 4 + 2 + 4) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 120,
+	.hsync_end = 1080 + 120 + 16,
+	.htotal = 1080 + 120 + 16 + 40,
+	.vdisplay = 1920,
+	.vsync_start = 1920 + 4,
+	.vsync_end = 1920 + 4 + 2,
+	.vtotal = 1920 + 4 + 2 + 4,
+	.width_mm = 64,
+	.height_mm = 114,
+};
+
+static int jdi_fhd_r63452_get_modes(struct drm_panel *panel,
+				    struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &jdi_fhd_r63452_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 jdi_fhd_r63452_panel_funcs = {
+	.prepare = jdi_fhd_r63452_prepare,
+	.unprepare = jdi_fhd_r63452_unprepare,
+	.get_modes = jdi_fhd_r63452_get_modes,
+};
+
+static int jdi_fhd_r63452_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct jdi_fhd_r63452 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	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;
+
+	drm_panel_init(&ctx->panel, dev, &jdi_fhd_r63452_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);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int jdi_fhd_r63452_remove(struct mipi_dsi_device *dsi)
+{
+	struct jdi_fhd_r63452 *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 jdi_fhd_r63452_of_match[] = {
+	{ .compatible = "jdi,fhd-r63452" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jdi_fhd_r63452_of_match);
+
+static struct mipi_dsi_driver jdi_fhd_r63452_driver = {
+	.probe = jdi_fhd_r63452_probe,
+	.remove = jdi_fhd_r63452_remove,
+	.driver = {
+		.name = "panel-jdi-fhd-r63452",
+		.of_match_table = jdi_fhd_r63452_of_match,
+	},
+};
+module_mipi_dsi_driver(jdi_fhd_r63452_driver);
+
+MODULE_AUTHOR("Raffaele Tranquillini <raffaele.tranquillini@gmail.com>");
+MODULE_DESCRIPTION("DRM driver for JDI FHD R63452 DSI panel, command mode");
+MODULE_LICENSE("GPL v2");
-- 
2.32.0