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From: Marijn Suijten <marijn.suijten@somainline.org>
Date: Sun, 21 May 2023 23:23:05 +0200
Subject: [PATCH RFC 03/10] drm/panel: Add LGD panel driver for Sony Xperia XZ3
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To: Neil Armstrong <neil.armstrong@linaro.org>,
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 Daniel Vetter <daniel@ffwll.ch>, Caleb Connolly <caleb@connolly.tech>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
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Cc: devicetree@vger.kernel.org,
 Marijn Suijten <marijn.suijten@somainline.org>,
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 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
 Jessica Zhang <quic_jesszhan@quicinc.com>,
 Kuogee Hsieh <quic_khsieh@quicinc.com>
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Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

Sony provides an unlabeled LGD + Atmel maXTouch assembly in its Xperia
XZ3 (tama akatsuki) phone, with custom DCS commands to match.

This panel features Display Stream Compression 1.1.

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
---
 drivers/gpu/drm/panel/Kconfig                   |  11 +
 drivers/gpu/drm/panel/Makefile                  |   1 +
 drivers/gpu/drm/panel/panel-sony-akatsuki-lgd.c | 362 ++++++++++++++++++++++++
 3 files changed, 374 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 67ef898d133f2..18bd116e78a71 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -706,6 +706,17 @@ config DRM_PANEL_SONY_ACX565AKM
 	  Say Y here if you want to enable support for the Sony ACX565AKM
 	  800x600 3.5" panel (found on the Nokia N900).
 
+config DRM_PANEL_SONY_AKATSUKI_LGD
+	tristate "Sony Xperia XZ3 LGD panel"
+	depends on GPIOLIB && OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the Sony Xperia XZ3
+	  1440x2880@60 6.0" OLED DSI cmd mode panel produced by LG Display.
+
+	  This panel uses Display Stream Compression 1.1.
+
 config DRM_PANEL_SONY_TD4353_JDI
 	tristate "Sony TD4353 JDI panel"
 	depends on GPIOLIB && OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index ff169781e82d7..85133f73558f3 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
+obj-$(CONFIG_DRM_PANEL_SONY_AKATSUKI_LGD) += panel-sony-akatsuki-lgd.o
 obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) += panel-sony-td4353-jdi.o
 obj-$(CONFIG_DRM_PANEL_SONY_TULIP_TRULY_NT35521) += panel-sony-tulip-truly-nt35521.o
 obj-$(CONFIG_DRM_PANEL_TDO_TL070WSH30) += panel-tdo-tl070wsh30.o
diff --git a/drivers/gpu/drm/panel/panel-sony-akatsuki-lgd.c b/drivers/gpu/drm/panel/panel-sony-akatsuki-lgd.c
new file mode 100644
index 0000000000000..f55788f963dab
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-sony-akatsuki-lgd.c
@@ -0,0 +1,362 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 Marijn Suijten <marijn.suijten@somainline.org>
+ *
+ * Based on Sony Downstream's "Atmel LGD ID5" Akatsuki panel dtsi.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.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>
+#include <drm/display/drm_dsc.h>
+#include <drm/display/drm_dsc_helper.h>
+
+struct sony_akatsuki_lgd {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator *vddio;
+	struct gpio_desc *reset_gpio;
+	bool prepared;
+};
+
+static inline struct sony_akatsuki_lgd *to_sony_akatsuki_lgd(struct drm_panel *panel)
+{
+	return container_of(panel, struct sony_akatsuki_lgd, panel);
+}
+
+static int sony_akatsuki_lgd_on(struct sony_akatsuki_lgd *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_write_seq(dsi, 0x7f, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xf1, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0x02, 0x01);
+	mipi_dsi_dcs_write_seq(dsi, 0x59, 0x01);
+	/* Enable backlight control */
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, BIT(5));
+	mipi_dsi_dcs_write_seq(dsi, 0x57, 0x20, 0x80, 0xde, 0x60, 0x00);
+
+	ret = mipi_dsi_dcs_set_column_address(dsi, 0, 1440 - 1);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set column address: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_dcs_set_page_address(dsi, 0, 2880 - 1);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set page address: %d\n", ret);
+		return ret;
+	}
+
+	mipi_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;
+	}
+
+	mipi_dsi_dcs_write_seq(dsi, 0x7f, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xf1, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x5a, 0x5a);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x03);
+	mipi_dsi_dcs_write_seq(dsi, 0xf6, 0x04);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x05);
+	mipi_dsi_dcs_write_seq(dsi, 0xf6, 0x01, 0x7f, 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(120);
+
+	mipi_dsi_dcs_write_seq(dsi, 0xe3, 0xac, 0x19, 0x34, 0x14, 0x7d);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to turn display on: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sony_akatsuki_lgd_off(struct sony_akatsuki_lgd *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 turn display off: %d\n", ret);
+		return ret;
+	}
+	msleep(20);
+
+	ret = mipi_dsi_dcs_set_tear_off(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set tear off: %d\n", ret);
+		return ret;
+	}
+
+	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(100);
+
+	return 0;
+}
+
+static int sony_akatsuki_lgd_prepare(struct drm_panel *panel)
+{
+	struct sony_akatsuki_lgd *ctx = to_sony_akatsuki_lgd(panel);
+	struct drm_dsc_picture_parameter_set pps;
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = regulator_enable(ctx->vddio);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable vddio regulator: %d\n", ret);
+		return ret;
+	}
+
+	msleep(100);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(5000, 5100);
+
+	ret = sony_akatsuki_lgd_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to power on panel: %d\n", ret);
+		goto fail;
+	}
+
+	if (ctx->dsi->dsc) {
+		drm_dsc_pps_payload_pack(&pps, ctx->dsi->dsc);
+
+		ret = mipi_dsi_picture_parameter_set(ctx->dsi, &pps);
+		if (ret < 0) {
+			dev_err(panel->dev, "failed to transmit PPS: %d\n", ret);
+			goto fail;
+		}
+		ret = mipi_dsi_compression_mode(ctx->dsi, true);
+		if (ret < 0) {
+			dev_err(dev, "failed to enable compression mode: %d\n", ret);
+			goto fail;
+		}
+
+		msleep(28);
+	}
+
+	ctx->prepared = true;
+	return 0;
+
+fail:
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	regulator_disable(ctx->vddio);
+	return ret;
+}
+
+static int sony_akatsuki_lgd_unprepare(struct drm_panel *panel)
+{
+	struct sony_akatsuki_lgd *ctx = to_sony_akatsuki_lgd(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ret = sony_akatsuki_lgd_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to power off panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	regulator_disable(ctx->vddio);
+
+	usleep_range(5000, 5100);
+
+	ctx->prepared = false;
+	return 0;
+}
+
+static const struct drm_display_mode sony_akatsuki_lgd_mode = {
+	.clock = (1440 + 312 + 8 + 8) * (2880 + 48 + 8 + 8) * 60 / 1000,
+	.hdisplay = 1440,
+	.hsync_start = 1440 + 312,
+	.hsync_end = 1440 + 312 + 8,
+	.htotal = 1440 + 312 + 8 + 8,
+	.vdisplay = 2880,
+	.vsync_start = 2880 + 48,
+	.vsync_end = 2880 + 48 + 8,
+	.vtotal = 2880 + 48 + 8 + 8,
+	.width_mm = 68,
+	.height_mm = 136,
+};
+
+static int sony_akatsuki_lgd_get_modes(struct drm_panel *panel,
+				   struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &sony_akatsuki_lgd_mode);
+}
+
+static const struct drm_panel_funcs sony_akatsuki_lgd_panel_funcs = {
+	.prepare = sony_akatsuki_lgd_prepare,
+	.unprepare = sony_akatsuki_lgd_unprepare,
+	.get_modes = sony_akatsuki_lgd_get_modes,
+};
+
+static int sony_akatsuki_lgd_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+
+	return mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+}
+
+static int sony_akatsuki_lgd_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	return brightness & 0x3ff;
+}
+
+static const struct backlight_ops sony_akatsuki_lgd_bl_ops = {
+	.update_status = sony_akatsuki_lgd_bl_update_status,
+	.get_brightness = sony_akatsuki_lgd_bl_get_brightness,
+};
+
+static int sony_akatsuki_lgd_probe(struct mipi_dsi_device *dsi)
+{
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 100,
+		.max_brightness = 1023,
+	};
+	struct device *dev = &dsi->dev;
+	struct sony_akatsuki_lgd *ctx;
+	struct drm_dsc_config *dsc;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->vddio = devm_regulator_get(dev, "vddio");
+	if (IS_ERR(ctx->vddio))
+		return dev_err_probe(dev, PTR_ERR(ctx->vddio),
+				     "Failed to get vddio\n");
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
+	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_CLOCK_NON_CONTINUOUS;
+
+	drm_panel_init(&ctx->panel, dev, &sony_akatsuki_lgd_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	ctx->panel.backlight = devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &sony_akatsuki_lgd_bl_ops, &props);
+	if (IS_ERR(ctx->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+				     "Failed to create backlight\n");
+
+	drm_panel_add(&ctx->panel);
+
+	/* This panel only supports DSC; unconditionally enable it */
+	dsi->dsc = dsc = devm_kzalloc(&dsi->dev, sizeof(*dsc), GFP_KERNEL);
+	if (!dsc)
+		return -ENOMEM;
+
+	dsc->dsc_version_major = 1;
+	dsc->dsc_version_minor = 1;
+
+	dsc->slice_height = 32;
+	dsc->slice_count = 2;
+	// TODO: Get hdisplay from the mode
+	WARN_ON(1440 % dsc->slice_count);
+	dsc->slice_width = 1440 / dsc->slice_count;
+	dsc->bits_per_component = 8;
+	dsc->bits_per_pixel = 8 << 4; /* 4 fractional bits */
+	dsc->block_pred_enable = true;
+
+	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 void sony_akatsuki_lgd_remove(struct mipi_dsi_device *dsi)
+{
+	struct sony_akatsuki_lgd *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);
+}
+
+static const struct of_device_id sony_akatsuki_lgd_of_match[] = {
+	{ .compatible = "sony,akatsuki-lgd" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sony_akatsuki_lgd_of_match);
+
+static struct mipi_dsi_driver sony_akatsuki_lgd_driver = {
+	.probe = sony_akatsuki_lgd_probe,
+	.remove = sony_akatsuki_lgd_remove,
+	.driver = {
+		.name = "panel-sony-akatsuki-lgd",
+		.of_match_table = sony_akatsuki_lgd_of_match,
+	},
+};
+module_mipi_dsi_driver(sony_akatsuki_lgd_driver);
+
+MODULE_AUTHOR("Marijn Suijten <marijn.suijten@somainline.org>");
+MODULE_DESCRIPTION("DRM panel driver for an unnamed LGD OLED panel found in the Sony Xperia XZ3");
+MODULE_LICENSE("GPL");