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From: Svyatoslav Ryhel <clamor95@gmail.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>,
	Simona Vetter <simona@ffwll.ch>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Thierry Reding <thierry.reding@kernel.org>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Jessica Zhang <jesszhan0024@gmail.com>,
	Mikko Perttunen <mperttunen@nvidia.com>,
	Svyatoslav Ryhel <clamor95@gmail.com>
Cc: dri-devel@lists.freedesktop.org,
	devicetree@vger.kernel.org,
	linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v6 03/10] drm/panel: Convert LG LH400WV3-SD04 to use MIPI DBI bus
Date: Thu,  5 Nov 2026 16:05:03 +0200
Message-ID: <20261105140510.165165-4-clamor95@gmail.com>
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Switch from a generic platform driver to a dedicated MIPI DBI driver.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/gpu/drm/panel/panel-lg-lh400wv3.c | 103 ++++++++++------------
 1 file changed, 46 insertions(+), 57 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-lg-lh400wv3.c b/drivers/gpu/drm/panel/panel-lg-lh400wv3.c
index 557bcb6f2ca70..ed099f671471e 100644
--- a/drivers/gpu/drm/panel/panel-lg-lh400wv3.c
+++ b/drivers/gpu/drm/panel/panel-lg-lh400wv3.c
@@ -14,6 +14,7 @@
 #include <video/mipi_display.h>
 
 #include <drm/drm_mipi_dbi.h>
+#include <drm/drm_mipi_dbi_bus.h>
 #include <drm/drm_modes.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
@@ -25,7 +26,7 @@ static const struct regulator_bulk_data lg_lh400wv3_supplies[] = {
 
 struct lg_lh400wv3 {
 	struct drm_panel panel;
-	struct mipi_dbi *dbi;
+	struct mipi_dbi_device *dbi;
 
 	struct regulator_bulk_data *supplies;
 	struct gpio_desc *reset_gpio;
@@ -36,13 +37,12 @@ static inline struct lg_lh400wv3 *to_lg_lh400wv3(struct drm_panel *panel)
 	return container_of(panel, struct lg_lh400wv3, panel);
 }
 
-#define panel_dbi_command(priv, cmd, seq...) \
+#define panel_dbi_command(dbidev, cmd, seq...) \
 ({ \
 	const u8 d[] = { seq }; \
-	struct drm_panel *panel = &(priv)->panel; \
-	struct device *dev = panel->dev; \
+	struct device *dev = &(dbidev)->dev; \
 	int ret; \
-	ret = mipi_dbi_command_stackbuf((priv)->dbi, cmd, d, ARRAY_SIZE(d)); \
+	ret = mipi_dbi_command_stackbuf((dbidev)->dbi, cmd, d, ARRAY_SIZE(d)); \
 	if (ret) \
 		dev_err_ratelimited(dev, "error %d when sending command %#02x\n", ret, cmd); \
 	ret; \
@@ -54,10 +54,6 @@ static int lg_lh400wv3_prepare(struct drm_panel *panel)
 	struct device *dev = panel->dev;
 	int ret;
 
-	priv->dbi = dev_get_drvdata(dev->parent);
-	if (!priv->dbi)
-		return -ENODEV;
-
 	gpiod_set_value_cansleep(priv->reset_gpio, 1);
 
 	ret = regulator_bulk_enable(ARRAY_SIZE(lg_lh400wv3_supplies), priv->supplies);
@@ -79,62 +75,55 @@ static int lg_lh400wv3_enable(struct drm_panel *panel)
 {
 	struct lg_lh400wv3 *priv = to_lg_lh400wv3(panel);
 
-	panel_dbi_command(priv, MIPI_DCS_EXIT_INVERT_MODE);
-	panel_dbi_command(priv, MIPI_DCS_SET_TEAR_ON);
+	panel_dbi_command(priv->dbi, MIPI_DCS_EXIT_INVERT_MODE);
+	panel_dbi_command(priv->dbi, MIPI_DCS_SET_TEAR_ON);
 
-	panel_dbi_command(priv, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_24BIT |
+	panel_dbi_command(priv->dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_24BIT |
 			  MIPI_DCS_PIXEL_FMT_24BIT << 4);
 
-	panel_dbi_command(priv, 0xb2, 0x00, 0xc8);
-	panel_dbi_command(priv, 0xb3, 0x00);
-	panel_dbi_command(priv, 0xb4, 0x04);
-	panel_dbi_command(priv, 0xb5, 0x42, 0x10, 0x10, 0x00, 0x20);
-	panel_dbi_command(priv, 0xb6, 0x0b, 0x0f, 0x3c, 0x13, 0x13, 0xe8);
-	panel_dbi_command(priv, 0xb7, 0x4c, 0x06, 0x0c, 0x00, 0x00);
-
-	panel_dbi_command(priv, 0xc0, 0x01, 0x11);
-	panel_dbi_command(priv, 0xc3, 0x07, 0x03, 0x04, 0x04, 0x04);
-	panel_dbi_command(priv, 0xc4, 0x12, 0x24, 0x18, 0x18, 0x02, 0x49);
-	panel_dbi_command(priv, 0xc5, 0x65);
-	panel_dbi_command(priv, 0xc6, 0x41, 0x63);
-
-	panel_dbi_command(priv, 0xd0, 0x00, 0x46, 0x74, 0x32, 0x1d, 0x03, 0x51, 0x15, 0x04);
-	panel_dbi_command(priv, 0xd1, 0x00, 0x46, 0x74, 0x32, 0x1d, 0x03, 0x51, 0x15, 0x04);
-	panel_dbi_command(priv, 0xd2, 0x00, 0x46, 0x74, 0x32, 0x1f, 0x03, 0x51, 0x15, 0x04);
-	panel_dbi_command(priv, 0xd3, 0x00, 0x46, 0x74, 0x32, 0x1f, 0x03, 0x51, 0x15, 0x04);
-	panel_dbi_command(priv, 0xd4, 0x01, 0x46, 0x74, 0x25, 0x00, 0x03, 0x51, 0x15, 0x04);
-	panel_dbi_command(priv, 0xd5, 0x01, 0x46, 0x74, 0x25, 0x00, 0x03, 0x51, 0x15, 0x04);
-
-	panel_dbi_command(priv, MIPI_DCS_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0xdf);
-	panel_dbi_command(priv, MIPI_DCS_SET_PAGE_ADDRESS, 0x00, 0x00, 0x03, 0x1f);
-
-	panel_dbi_command(priv, MIPI_DCS_EXIT_SLEEP_MODE);
+	panel_dbi_command(priv->dbi, 0xb2, 0x00, 0xc8);
+	panel_dbi_command(priv->dbi, 0xb3, 0x00);
+	panel_dbi_command(priv->dbi, 0xb4, 0x04);
+	panel_dbi_command(priv->dbi, 0xb5, 0x42, 0x10, 0x10, 0x00, 0x20);
+	panel_dbi_command(priv->dbi, 0xb6, 0x0b, 0x0f, 0x3c, 0x13, 0x13, 0xe8);
+	panel_dbi_command(priv->dbi, 0xb7, 0x4c, 0x06, 0x0c, 0x00, 0x00);
+
+	panel_dbi_command(priv->dbi, 0xc0, 0x01, 0x11);
+	panel_dbi_command(priv->dbi, 0xc3, 0x07, 0x03, 0x04, 0x04, 0x04);
+	panel_dbi_command(priv->dbi, 0xc4, 0x12, 0x24, 0x18, 0x18, 0x02, 0x49);
+	panel_dbi_command(priv->dbi, 0xc5, 0x65);
+	panel_dbi_command(priv->dbi, 0xc6, 0x41, 0x63);
+
+	panel_dbi_command(priv->dbi, 0xd0, 0x00, 0x46, 0x74, 0x32, 0x1d, 0x03, 0x51, 0x15, 0x04);
+	panel_dbi_command(priv->dbi, 0xd1, 0x00, 0x46, 0x74, 0x32, 0x1d, 0x03, 0x51, 0x15, 0x04);
+	panel_dbi_command(priv->dbi, 0xd2, 0x00, 0x46, 0x74, 0x32, 0x1f, 0x03, 0x51, 0x15, 0x04);
+	panel_dbi_command(priv->dbi, 0xd3, 0x00, 0x46, 0x74, 0x32, 0x1f, 0x03, 0x51, 0x15, 0x04);
+	panel_dbi_command(priv->dbi, 0xd4, 0x01, 0x46, 0x74, 0x25, 0x00, 0x03, 0x51, 0x15, 0x04);
+	panel_dbi_command(priv->dbi, 0xd5, 0x01, 0x46, 0x74, 0x25, 0x00, 0x03, 0x51, 0x15, 0x04);
+
+	panel_dbi_command(priv->dbi, MIPI_DCS_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0xdf);
+	panel_dbi_command(priv->dbi, MIPI_DCS_SET_PAGE_ADDRESS, 0x00, 0x00, 0x03, 0x1f);
+
+	panel_dbi_command(priv->dbi, MIPI_DCS_EXIT_SLEEP_MODE);
 	msleep(120);
 
-	panel_dbi_command(priv, MIPI_DCS_WRITE_MEMORY_START);
-	panel_dbi_command(priv, MIPI_DCS_SET_DISPLAY_ON);
+	panel_dbi_command(priv->dbi, MIPI_DCS_WRITE_MEMORY_START);
+	panel_dbi_command(priv->dbi, MIPI_DCS_SET_DISPLAY_ON);
 
 	return 0;
 }
 
-static int lg_lh400wv3_disable(struct drm_panel *panel)
+static int lg_lh400wv3_unprepare(struct drm_panel *panel)
 {
 	struct lg_lh400wv3 *priv = to_lg_lh400wv3(panel);
 
-	panel_dbi_command(priv, MIPI_DCS_SET_DISPLAY_OFF);
-	panel_dbi_command(priv, MIPI_DCS_ENTER_SLEEP_MODE);
+	panel_dbi_command(priv->dbi, MIPI_DCS_SET_DISPLAY_OFF);
+	panel_dbi_command(priv->dbi, MIPI_DCS_ENTER_SLEEP_MODE);
 	msleep(150);
 
-	panel_dbi_command(priv, 0xc1, 0x01);
+	panel_dbi_command(priv->dbi, 0xc1, 0x01);
 	usleep_range(10000, 11000);
 
-	return 0;
-};
-
-static int lg_lh400wv3_unprepare(struct drm_panel *panel)
-{
-	struct lg_lh400wv3 *priv = to_lg_lh400wv3(panel);
-
 	gpiod_set_value_cansleep(priv->reset_gpio, 1);
 	regulator_bulk_disable(ARRAY_SIZE(lg_lh400wv3_supplies), priv->supplies);
 
@@ -177,14 +166,13 @@ static int lg_lh400wv3_get_modes(struct drm_panel *panel,
 static const struct drm_panel_funcs lg_lh400wv3_panel_funcs = {
 	.prepare = lg_lh400wv3_prepare,
 	.enable = lg_lh400wv3_enable,
-	.disable = lg_lh400wv3_disable,
 	.unprepare = lg_lh400wv3_unprepare,
 	.get_modes = lg_lh400wv3_get_modes,
 };
 
-static int lg_lh400wv3_probe(struct platform_device *pdev)
+static int lg_lh400wv3_probe(struct mipi_dbi_device *dbi)
 {
-	struct device *dev = &pdev->dev;
+	struct device *dev = &dbi->dev;
 	struct lg_lh400wv3 *priv;
 	int ret;
 
@@ -203,6 +191,9 @@ static int lg_lh400wv3_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(priv->reset_gpio),
 				     "Failed to get reset gpio\n");
 
+	priv->dbi = dbi;
+	mipi_dbi_set_drvdata(dbi, priv);
+
 	ret = drm_panel_of_backlight(&priv->panel);
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to get backlight\n");
@@ -211,9 +202,7 @@ static int lg_lh400wv3_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to add panel\n");
 
-	platform_set_drvdata(pdev, priv);
-
-	return 0;
+	return devm_mipi_dbi_attach(dev, dbi);
 }
 
 static const struct of_device_id lg_lh400wv3_of_match[] = {
@@ -222,14 +211,14 @@ static const struct of_device_id lg_lh400wv3_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, lg_lh400wv3_of_match);
 
-static struct platform_driver lg_lh400wv3_driver = {
+static struct mipi_dbi_driver lg_lh400wv3_driver = {
 	.driver = {
 		.name = "panel-lg-lh400wv3",
 		.of_match_table = lg_lh400wv3_of_match,
 	},
 	.probe = lg_lh400wv3_probe,
 };
-module_platform_driver(lg_lh400wv3_driver);
+module_mipi_dbi_driver(lg_lh400wv3_driver);
 
 MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
 MODULE_DESCRIPTION("LG LH400WV3-SD04 MIPI DBI Type B panel driver");
-- 
2.53.0