Date: Sat, 30 Mar 2024 05:59:30 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sumit Semwal <sumit.semwal@...aro.org>, 
 Caleb Connolly <caleb.connolly@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 Vinod Koul <vkoul@...nel.org>, Caleb Connolly <caleb@...nolly.tech>
Subject: [PATCH 3/3] drm: panel: Add LG sw43408 panel driver

From: Sumit Semwal <sumit.semwal@...aro.org>

LG SW43408 is 1080x2160, 4-lane MIPI-DSI panel, used in some Pixel3
phones.

Whatever init sequence we have for this panel isn't capable of
initialising it completely, toggling the reset gpio ever causes the
panel to die. Until this is resolved we avoid resetting the panel. The
disable/unprepare functions only put the panel to sleep mode and
disable the backlight.

Signed-off-by: Sumit Semwal <sumit.semwal@...aro.org>
[vinod: Add DSC support]
Signed-off-by: Vinod Koul <vkoul@...nel.org>
[caleb: cleanup and support turning off the panel]
Signed-off-by: Caleb Connolly <caleb@...nolly.tech>
[DB: partially rewrote the driver and fixed DSC programming]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 MAINTAINERS                              |   8 +
 drivers/gpu/drm/panel/Kconfig            |  11 ++
 drivers/gpu/drm/panel/Makefile           |   1 +
 drivers/gpu/drm/panel/panel-lg-sw43408.c | 322 +++++++++++++++++++++++++++++++
 4 files changed, 342 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 4b511a55101c..f4cf7ee97376 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6755,6 +6755,14 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/display/panel/jadard,jd9365da-h3.yaml
 F:	drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
 
+DRM DRIVER FOR LG SW43408 PANELS
+M:	Sumit Semwal <sumit.semwal@...aro.org>
+M:	Caleb Connolly <caleb.connolly@...aro.org>
+S:	Maintained
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	Documentation/devicetree/bindings/display/panel/lg,sw43408.yaml
+F:	drivers/gpu/drm/panel/panel-lg-sw43408.c
+
 DRM DRIVER FOR LOGICVC DISPLAY CONTROLLER
 M:	Paul Kocialkowski <paul.kocialkowski@...tlin.com>
 S:	Supported
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index d037b3b8b999..f94c702735cb 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -335,6 +335,17 @@ config DRM_PANEL_LG_LG4573
 	  Say Y here if you want to enable support for LG4573 RGB panel.
 	  To compile this driver as a module, choose M here.
 
+config DRM_PANEL_LG_SW43408
+	tristate "LG SW43408 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 LG sw43408 panel.
+	  The panel has a 1080x2160 resolution and uses
+	  24 bit RGB per pixel. It provides a MIPI DSI interface to
+	  the host and has a built-in LED backlight.
+
 config DRM_PANEL_MAGNACHIP_D53E6EA8966
 	tristate "Magnachip D53E6EA8966 DSI panel"
 	depends on OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index f156d7fa0bcc..a75687d13caf 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_DRM_PANEL_LEADTEK_LTK050H3146W) += panel-leadtek-ltk050h3146w.o
 obj-$(CONFIG_DRM_PANEL_LEADTEK_LTK500HD1829) += panel-leadtek-ltk500hd1829.o
 obj-$(CONFIG_DRM_PANEL_LG_LB035Q02) += panel-lg-lb035q02.o
 obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
+obj-$(CONFIG_DRM_PANEL_LG_SW43408) += panel-lg-sw43408.o
 obj-$(CONFIG_DRM_PANEL_MAGNACHIP_D53E6EA8966) += panel-magnachip-d53e6ea8966.o
 obj-$(CONFIG_DRM_PANEL_NEC_NL8048HL11) += panel-nec-nl8048hl11.o
 obj-$(CONFIG_DRM_PANEL_NEWVISION_NV3051D) += panel-newvision-nv3051d.o
diff --git a/drivers/gpu/drm/panel/panel-lg-sw43408.c b/drivers/gpu/drm/panel/panel-lg-sw43408.c
new file mode 100644
index 000000000000..365d25e14d54
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-lg-sw43408.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019-2024 Linaro Ltd
+ * Author: Sumit Semwal <sumit.semwal@...aro.org>
+ *	 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
+ */
+
+#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 <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.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>
+
+#define NUM_SUPPLIES 2
+
+struct sw43408_panel {
+	struct drm_panel base;
+	struct mipi_dsi_device *link;
+
+	const struct drm_display_mode *mode;
+
+	struct regulator_bulk_data supplies[NUM_SUPPLIES];
+
+	struct gpio_desc *reset_gpio;
+};
+
+static inline struct sw43408_panel *to_panel_info(struct drm_panel *panel)
+{
+	return container_of(panel, struct sw43408_panel, base);
+}
+
+static int sw43408_unprepare(struct drm_panel *panel)
+{
+	struct sw43408_panel *ctx = to_panel_info(panel);
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_off(ctx->link);
+	if (ret < 0)
+		dev_err(panel->dev, "set_display_off cmd failed ret = %d\n", ret);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(ctx->link);
+	if (ret < 0)
+		dev_err(panel->dev, "enter_sleep cmd failed ret = %d\n", ret);
+
+	msleep(100);
+
+	gpiod_set_value(ctx->reset_gpio, 1);
+
+	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+}
+
+static int sw43408_program(struct drm_panel *panel)
+{
+	struct sw43408_panel *ctx = to_panel_info(panel);
+	struct drm_dsc_picture_parameter_set pps;
+	u8 dsc_en = 0x11;
+
+	mipi_dsi_dcs_write_seq(ctx->link, MIPI_DCS_SET_GAMMA_CURVE, 0x02);
+
+	mipi_dsi_dcs_set_tear_on(ctx->link, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+
+	mipi_dsi_dcs_write_seq(ctx->link, 0x53, 0x0c, 0x30);
+	mipi_dsi_dcs_write_seq(ctx->link, 0x55, 0x00, 0x70, 0xdf, 0x00, 0x70, 0xdf);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xf7, 0x01, 0x49, 0x0c);
+
+	mipi_dsi_dcs_exit_sleep_mode(ctx->link);
+
+	msleep(135);
+
+	mipi_dsi_compression_mode_raw(ctx->link, &dsc_en, 1);
+
+	mipi_dsi_dcs_write_seq(ctx->link, 0xb0, 0xac);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xe5,
+			       0x00, 0x3a, 0x00, 0x3a, 0x00, 0x0e, 0x10);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xb5,
+			       0x75, 0x60, 0x2d, 0x5d, 0x80, 0x00, 0x0a, 0x0b,
+			       0x00, 0x05, 0x0b, 0x00, 0x80, 0x0d, 0x0e, 0x40,
+			       0x00, 0x0c, 0x00, 0x16, 0x00, 0xb8, 0x00, 0x80,
+			       0x0d, 0x0e, 0x40, 0x00, 0x0c, 0x00, 0x16, 0x00,
+			       0xb8, 0x00, 0x81, 0x00, 0x03, 0x03, 0x03, 0x01,
+			       0x01);
+	msleep(85);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xcd,
+			       0x00, 0x00, 0x00, 0x19, 0x19, 0x19, 0x19, 0x19,
+			       0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
+			       0x16, 0x16);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xcb, 0x80, 0x5c, 0x07, 0x03, 0x28);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xc0, 0x02, 0x02, 0x0f);
+	mipi_dsi_dcs_write_seq(ctx->link, 0x55, 0x04, 0x61, 0xdb, 0x04, 0x70, 0xdb);
+	mipi_dsi_dcs_write_seq(ctx->link, 0xb0, 0xca);
+
+	mipi_dsi_dcs_set_display_on(ctx->link);
+
+	msleep(50);
+
+	ctx->link->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	drm_dsc_pps_payload_pack(&pps, ctx->link->dsc);
+	mipi_dsi_picture_parameter_set(ctx->link, &pps);
+
+	ctx->link->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int sw43408_prepare(struct drm_panel *panel)
+{
+	struct sw43408_panel *ctx = to_panel_info(panel);
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	usleep_range(5000, 6000);
+
+	gpiod_set_value(ctx->reset_gpio, 0);
+	usleep_range(9000, 10000);
+	gpiod_set_value(ctx->reset_gpio, 1);
+	usleep_range(1000, 2000);
+	gpiod_set_value(ctx->reset_gpio, 0);
+	usleep_range(9000, 10000);
+
+	ret = sw43408_program(panel);
+	if (ret)
+		goto poweroff;
+
+	return 0;
+
+poweroff:
+	gpiod_set_value(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	return ret;
+}
+
+static int sw43408_get_modes(struct drm_panel *panel,
+			      struct drm_connector *connector)
+{
+	struct sw43408_panel *ctx = to_panel_info(panel);
+
+	return drm_connector_helper_get_modes_fixed(connector, ctx->mode);
+}
+
+static int sw43408_backlight_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	uint16_t brightness = backlight_get_brightness(bl);
+
+	return mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+}
+
+const struct backlight_ops sw43408_backlight_ops = {
+	.update_status = sw43408_backlight_update_status,
+};
+
+static int sw43408_backlight_init(struct sw43408_panel *ctx)
+{
+	struct device *dev = &ctx->link->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_PLATFORM,
+		.brightness = 255,
+		.max_brightness = 255,
+	};
+
+	ctx->base.backlight = devm_backlight_device_register(dev, dev_name(dev), dev,
+							ctx->link,
+							&sw43408_backlight_ops,
+							&props);
+
+	if (IS_ERR(ctx->base.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->base.backlight),
+				     "Failed to create backlight\n");
+
+	return 0;
+}
+
+static const struct drm_panel_funcs sw43408_funcs = {
+	.unprepare = sw43408_unprepare,
+	.prepare = sw43408_prepare,
+	.get_modes = sw43408_get_modes,
+};
+
+static const struct drm_display_mode sw43408_default_mode = {
+	.clock = 152340,
+
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 20,
+	.hsync_end = 1080 + 20 + 32,
+	.htotal = 1080 + 20 + 32 + 20,
+
+	.vdisplay = 2160,
+	.vsync_start = 2160 + 20,
+	.vsync_end = 2160 + 20 + 4,
+	.vtotal = 2160 + 20 + 4 + 20,
+
+	.width_mm = 62,
+	.height_mm = 124,
+
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static const struct of_device_id sw43408_of_match[] = {
+	{ .compatible = "lg,sw43408", .data = &sw43408_default_mode },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sw43408_of_match);
+
+static int sw43408_add(struct sw43408_panel *ctx)
+{
+	struct device *dev = &ctx->link->dev;
+	int ret;
+
+	ctx->supplies[0].supply = "vddi"; /* 1.88 V */
+	ctx->supplies[0].init_load_uA = 62000;
+	ctx->supplies[1].supply = "vpnl"; /* 3.0 V */
+	ctx->supplies[1].init_load_uA = 857000;
+
+	ret = devm_regulator_bulk_get(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)) {
+		dev_err(dev, "cannot get reset gpio %ld\n",
+			      PTR_ERR(ctx->reset_gpio));
+		return PTR_ERR(ctx->reset_gpio);
+	}
+
+	ret = sw43408_backlight_init(ctx);
+	if (ret < 0)
+		return ret;
+
+	ctx->base.prepare_prev_first = true;
+
+	drm_panel_init(&ctx->base, dev, &sw43408_funcs, DRM_MODE_CONNECTOR_DSI);
+
+	drm_panel_add(&ctx->base);
+	return ret;
+}
+
+static int sw43408_probe(struct mipi_dsi_device *dsi)
+{
+	struct sw43408_panel *ctx;
+	struct drm_dsc_config *dsc;
+	int ret;
+
+	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->mode = of_device_get_match_data(&dsi->dev);
+	dsi->mode_flags = MIPI_DSI_MODE_LPM;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->lanes = 4;
+
+	ctx->link = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ret = sw43408_add(ctx);
+	if (ret < 0)
+		return ret;
+
+	/* The panel is DSC panel only, set the dsc params */
+	dsc = devm_kzalloc(&dsi->dev, sizeof(*dsc), GFP_KERNEL);
+	if (!dsc)
+		return -ENOMEM;
+
+	dsc->dsc_version_major = 0x1;
+	dsc->dsc_version_minor = 0x1;
+
+	dsc->slice_height = 16;
+	dsc->slice_width = 540;
+	dsc->slice_count = 2;
+	dsc->bits_per_component = 8;
+	dsc->bits_per_pixel = 8 << 4;
+	dsc->block_pred_enable = true;
+
+	dsi->dsc = dsc;
+
+	return mipi_dsi_attach(dsi);
+}
+
+static void sw43408_remove(struct mipi_dsi_device *dsi)
+{
+	struct sw43408_panel *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = sw43408_unprepare(&ctx->base);
+	if (ret < 0)
+		dev_err(&dsi->dev, "failed to unprepare panel: %d\n",
+			      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->base);
+}
+
+static struct mipi_dsi_driver sw43408_driver = {
+	.driver = {
+		.name = "panel-lg-sw43408",
+		.of_match_table = sw43408_of_match,
+	},
+	.probe = sw43408_probe,
+	.remove = sw43408_remove,
+};
+module_mipi_dsi_driver(sw43408_driver);
+
+MODULE_AUTHOR("Sumit Semwal <sumit.semwal@...aro.org>");
+MODULE_DESCRIPTION("LG SW436408 MIPI-DSI LED panel");
+MODULE_LICENSE("GPL");

-- 
2.39.2

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