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From: Jessica Zhang <quic_jesszhan@quicinc.com>
Date: Tue, 16 May 2023 13:20:31 -0700
Subject: [PATCH 2/2] drm/panel: Add driver for Visionox r66451 panel
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Add support for the 1080x2340 Visionox R66451 AMOLED DSI panel that
comes with the Qualcomm HDK8350 display expansion pack.

The panel enables display compression (DSC v1.2) by default.

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
---
 drivers/gpu/drm/panel/Kconfig                 |   8 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-visionox-r66451.c | 395 ++++++++++++++++++++++++++
 3 files changed, 404 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 29cf5fa39ff2..9c2c36dbddf3 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -766,6 +766,14 @@ config DRM_PANEL_VISIONOX_VTDR6130
 	  Say Y here if you want to enable support for Visionox
 	  VTDR6130 1080x2400 AMOLED DSI panel.
 
+config DRM_PANEL_VISIONOX_R66451
+	tristate "Visionox R66451"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	help
+	  Say Y here if you want to enable support for Visionox
+	  R66451 1080x2340 AMOLED DSI panel.
+
 config DRM_PANEL_WIDECHIPS_WS2401
 	tristate "Widechips WS2401 DPI panel driver"
 	depends on SPI && GPIOLIB
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index b3e8ba29edd3..e043a92ee676 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -78,5 +78,6 @@ obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
 obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
 obj-$(CONFIG_DRM_PANEL_VISIONOX_RM69299) += panel-visionox-rm69299.o
 obj-$(CONFIG_DRM_PANEL_VISIONOX_VTDR6130) += panel-visionox-vtdr6130.o
+obj-$(CONFIG_DRM_PANEL_VISIONOX_R66451) += panel-visionox-r66451.o
 obj-$(CONFIG_DRM_PANEL_WIDECHIPS_WS2401) += panel-widechips-ws2401.o
 obj-$(CONFIG_DRM_PANEL_XINPENG_XPP055C272) += panel-xinpeng-xpp055c272.o
diff --git a/drivers/gpu/drm/panel/panel-visionox-r66451.c b/drivers/gpu/drm/panel/panel-visionox-r66451.c
new file mode 100644
index 000000000000..e3648ead3e84
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-visionox-r66451.c
@@ -0,0 +1,395 @@
+//SPDX-License-Identifier: GPL-2.0-only
+//Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/display/drm_dsc.h>
+#include <drm/display/drm_dsc_helper.h>
+
+#include <video/mipi_display.h>
+
+struct visionox_r66451 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data supplies[2];
+	bool prepared, enabled;
+};
+
+static inline struct visionox_r66451 *to_visionox_r66451(struct drm_panel *panel)
+{
+	return container_of(panel, struct visionox_r66451, panel);
+}
+
+static void visionox_r66451_reset(struct visionox_r66451 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 10100);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 10100);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 10100);
+}
+
+static int visionox_r66451_on(struct visionox_r66451 *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, 0xb0, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xc2,
+			       0x09, 0x24, 0x0c, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00,
+			       0x09, 0x3c);
+	mipi_dsi_dcs_write_seq(dsi, 0xd7,
+			       0x00, 0xb9, 0x3c, 0x00, 0x40, 0x04, 0x00, 0xa0, 0x0a,
+			       0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x19,
+			       0x3c, 0x00, 0x40, 0x04, 0x00, 0xa0, 0x0a);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x80);
+	mipi_dsi_dcs_write_seq(dsi, 0xde,
+			       0x40, 0x00, 0x18, 0x00, 0x18, 0x00, 0x18, 0x00, 0x18,
+			       0x10, 0x00, 0x18, 0x00, 0x18, 0x00, 0x18, 0x02, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x04);
+	mipi_dsi_dcs_write_seq(dsi, 0xe8, 0x00, 0x02);
+	mipi_dsi_dcs_write_seq(dsi, 0xe4, 0x00, 0x08);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xc4,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x32);
+	mipi_dsi_dcs_write_seq(dsi, 0xcf,
+			       0x64, 0x0b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
+			       0x00, 0x0b, 0x77, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+			       0x02, 0x02, 0x02, 0x02, 0x02, 0x03);
+	mipi_dsi_dcs_write_seq(dsi, 0xd3,
+			       0x45, 0x00, 0x00, 0x01, 0x13, 0x15, 0x00, 0x15, 0x07,
+			       0x0f, 0x77, 0x77, 0x77, 0x37, 0xb2, 0x11, 0x00, 0xa0,
+			       0x3c, 0x9c);
+	mipi_dsi_dcs_write_seq(dsi, 0xd7,
+			       0x00, 0xb9, 0x34, 0x00, 0x40, 0x04, 0x00, 0xa0, 0x0a,
+			       0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x19,
+			       0x34, 0x00, 0x40, 0x04, 0x00, 0xa0, 0x0a);
+	mipi_dsi_dcs_write_seq(dsi, 0xd8,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x3a, 0x00, 0x3a, 0x00, 0x3a, 0x00, 0x3a, 0x00, 0x3a,
+			       0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x0a, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a,
+			       0x00, 0x32, 0x00, 0x0a, 0x00, 0x22);
+	mipi_dsi_dcs_write_seq(dsi, 0xdf,
+			       0x50, 0x42, 0x58, 0x81, 0x2d, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x6b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x01, 0x0f, 0xff, 0xd4, 0x0e, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x0f, 0x53, 0xf1, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xf7, 0x01);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x80);
+	mipi_dsi_dcs_write_seq(dsi, 0xe4, 0x34, 0xb4, 0x00, 0x00, 0x00, 0x39, 0x04, 0x09, 0x34);
+	mipi_dsi_dcs_write_seq(dsi, 0xe6, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x04);
+	mipi_dsi_dcs_write_seq(dsi, 0xdf, 0x50, 0x40);
+	mipi_dsi_dcs_write_seq(dsi, 0xf3, 0x50, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x11);
+	mipi_dsi_dcs_write_seq(dsi, 0xf3, 0x01, 0x00, 0x00, 0x00, 0x01);
+	mipi_dsi_dcs_write_seq(dsi, 0xf4, 0x00, 0x02);
+	mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x19);
+	mipi_dsi_dcs_write_seq(dsi, 0xdf, 0x50, 0x42);
+	mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x04, 0x37);
+	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PAGE_ADDRESS, 0x00, 0x00, 0x09, 0x23);
+
+	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);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed on set display on: %d\n", ret);
+		return ret;
+	}
+	msleep(20);
+
+	return 0;
+}
+
+static int visionox_r66451_off(struct visionox_r66451 *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;
+	}
+	msleep(20);
+
+	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 visionox_r66451_prepare(struct drm_panel *panel)
+{
+	struct visionox_r66451 *ctx = to_visionox_r66451(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)
+		return ret;
+
+	visionox_r66451_reset(ctx);
+
+	ret = visionox_r66451_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 visionox_r66451_unprepare(struct drm_panel *panel)
+{
+	struct visionox_r66451 *ctx = to_visionox_r66451(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ret = visionox_r66451_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 visionox_r66451_mode = {
+	.clock = (1080 + 95 + 1 + 40) * (2340 + 25 + 1 + 4) * 120 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 95,
+	.hsync_end = 1080 + 95 + 1,
+	.htotal = 1080 + 95 + 1 + 40,
+	.vdisplay = 2340,
+	.vsync_start = 2340 + 25,
+	.vsync_end = 2340 + 25 + 1,
+	.vtotal = 2340 + 25 + 1 + 4,
+	.width_mm = 0,
+	.height_mm = 0,
+};
+
+static int visionox_r66451_enable(struct drm_panel *panel)
+{
+	struct visionox_r66451 *ctx = to_visionox_r66451(panel);
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct drm_dsc_picture_parameter_set pps;
+	int ret;
+
+	if (ctx->enabled)
+		return 0;
+
+	if (!dsi->dsc) {
+		dev_err(&dsi->dev, "DSC not attached to DSI\n");
+		return -ENODEV;
+	}
+
+	drm_dsc_pps_payload_pack(&pps, dsi->dsc);
+	ret = mipi_dsi_picture_parameter_set(dsi, &pps);
+
+	ctx->enabled = true;
+
+	return 0;
+}
+
+static int visionox_r66451_disable(struct drm_panel *panel)
+{
+	struct visionox_r66451 *ctx = to_visionox_r66451(panel);
+
+	ctx->enabled = false;
+
+	return 0;
+}
+
+static int visionox_r66451_get_modes(struct drm_panel *panel,
+				    struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &visionox_r66451_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 visionox_r66451_funcs = {
+	.prepare = visionox_r66451_prepare,
+	.unprepare = visionox_r66451_unprepare,
+	.get_modes = visionox_r66451_get_modes,
+	.enable = visionox_r66451_enable,
+	.disable = visionox_r66451_disable,
+};
+
+static int visionox_r66451_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(dsi, cpu_to_le16(brightness));
+}
+
+static const struct backlight_ops visionox_r66451_bl_ops = {
+	.update_status = visionox_r66451_bl_update_status,
+};
+
+static struct backlight_device *
+visionox_r66451_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 255,
+		.max_brightness = 4095,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &visionox_r66451_bl_ops, &props);
+}
+
+static int visionox_r66451_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct visionox_r66451 *ctx;
+	struct drm_dsc_config *dsc;
+	int ret = 0;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	dsc = devm_kzalloc(dev, sizeof(*dsc), GFP_KERNEL);
+	if (!dsc)
+		return -ENOMEM;
+
+	/* Set DSC params */
+	dsc->dsc_version_major = 0x1;
+	dsc->dsc_version_minor = 0x2;
+
+	dsc->slice_height = 20;
+	dsc->slice_width = 540;
+	dsc->slice_count = 2;
+	dsc->bits_per_component = 8;
+	dsc->bits_per_pixel = 0x8 << 4;
+	dsc->block_pred_enable = true;
+
+	dsi->dsc = dsc;
+
+	ctx->supplies[0].supply = "vddio";
+	ctx->supplies[1].supply = "vdd";
+
+	ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(ctx->supplies),
+			ctx->supplies);
+
+	if (ret < 0)
+		return ret;
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	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_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+	drm_panel_init(&ctx->panel, dev, &visionox_r66451_funcs, DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.backlight = visionox_r66451_create_backlight(dsi);
+	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);
+
+	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;
+}
+
+static void visionox_r66451_remove(struct mipi_dsi_device *dsi)
+{
+	struct visionox_r66451 *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id visionox_r66451_of_match[] = {
+	{.compatible = "visionox,r66451"},
+	{ /*sentinel*/ }
+};
+MODULE_DEVICE_TABLE(of, visionox_r66451_of_match);
+
+static struct mipi_dsi_driver visionox_r66451_driver = {
+	.probe = visionox_r66451_probe,
+	.remove = visionox_r66451_remove,
+	.driver = {
+		.name = "panel-visionox-r66451",
+		.of_match_table = visionox_r66451_of_match,
+	},
+};
+
+module_mipi_dsi_driver(visionox_r66451_driver);
+
+MODULE_AUTHOR("Jessica Zhang <quic_jesszhan@quicinc.com>");
+MODULE_DESCRIPTION("Panel driver for the Visionox R66451 AMOLED DSI panel");
+MODULE_LICENSE("GPL");