linux-kernel - [PATCH v5 2/2] drm/panel: ilitek-ili9882t: Add support for Ilitek IL79900A-based panels

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Message-Id: <20251031100447.253164-3-yelangyan@huaqin.corp-partner.google.com>
Date: Fri, 31 Oct 2025 18:04:47 +0800
From: Langyan Ye <yelangyan@...qin.corp-partner.google.com>
To: neil.armstrong@...aro.org,
	airlied@...il.com,
	simona@...ll.ch,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	dianders@...omium.org
Cc: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Langyan Ye <yelangyan@...qin.corp-partner.google.com>
Subject: [PATCH v5 2/2] drm/panel: ilitek-ili9882t: Add support for Ilitek IL79900A-based panels

The Ilitek IL79900A display controller is similar to the ILI9882T and can
be supported within the existing `panel-ilitek-ili9882t.c` driver.

This patch extends the ILI9882T driver to handle IL79900A-based panels,
such as the Tianma TL121BVMS07-00. The IL79900A uses a similar command
sequence and initialization flow, with minor differences in power supply
configuration and timing.

Signed-off-by: Langyan Ye <yelangyan@...qin.corp-partner.google.com>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9882t.c | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
index 85c7059be214..c52f20863fc7 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
@@ -61,6 +61,13 @@ struct ili9882t {
 	mipi_dsi_dcs_write_seq_multi(ctx, ILI9882T_DCS_SWITCH_PAGE, \
 				     0x98, 0x82, (page))
 
+/* IL79900A-specific commands, add new commands as you decode them */
+#define IL79900A_DCS_SWITCH_PAGE	0xFF
+
+#define il79900a_switch_page(ctx, page) \
+	mipi_dsi_dcs_write_seq_multi(ctx, IL79900A_DCS_SWITCH_PAGE, \
+				     0x5a, 0xa5, (page))
+
 static int starry_ili9882t_init(struct ili9882t *ili)
 {
 	struct mipi_dsi_multi_context ctx = { .dsi = ili->dsi };
@@ -413,6 +420,38 @@ static int starry_ili9882t_init(struct ili9882t *ili)
 	return ctx.accum_err;
 };
 
+static int tianma_il79900a_init(struct ili9882t *ili)
+{
+	struct mipi_dsi_multi_context ctx = { .dsi = ili->dsi };
+
+	mipi_dsi_usleep_range(&ctx, 5000, 5100);
+
+	il79900a_switch_page(&ctx, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x3e, 0x62);
+
+	il79900a_switch_page(&ctx, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x1b, 0x20);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x5d, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x5e, 0x40);
+
+	il79900a_switch_page(&ctx, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0X29, 0x00);
+
+	il79900a_switch_page(&ctx, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x92, 0x22);
+
+	il79900a_switch_page(&ctx, 0x00);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&ctx);
+
+	mipi_dsi_msleep(&ctx, 120);
+
+	mipi_dsi_dcs_set_display_on_multi(&ctx);
+
+	mipi_dsi_msleep(&ctx, 80);
+
+	return 0;
+};
+
 static inline struct ili9882t *to_ili9882t(struct drm_panel *panel)
 {
 	return container_of(panel, struct ili9882t, base);
@@ -529,6 +568,19 @@ static const struct drm_display_mode starry_ili9882t_default_mode = {
 	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 };
 
+static const struct drm_display_mode tianma_il79900a_default_mode = {
+	.clock = 264355,
+	.hdisplay = 1600,
+	.hsync_start = 1600 + 20,
+	.hsync_end = 1600 + 20 + 4,
+	.htotal = 1600 + 20 + 4 + 20,
+	.vdisplay = 2560,
+	.vsync_start = 2560 + 82,
+	.vsync_end = 2560 + 82 + 2,
+	.vtotal = 2560 + 82 + 2 + 36,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
 static const struct panel_desc starry_ili9882t_desc = {
 	.modes = &starry_ili9882t_default_mode,
 	.bpc = 8,
@@ -543,6 +595,20 @@ static const struct panel_desc starry_ili9882t_desc = {
 	.init = starry_ili9882t_init,
 };
 
+static const struct panel_desc tianma_tl121bvms07_desc = {
+	.modes = &tianma_il79900a_default_mode,
+	.bpc = 8,
+	.size = {
+		.width_mm = 163,
+		.height_mm = 260,
+	},
+	.lanes = 3,
+	.format = MIPI_DSI_FMT_RGB888,
+	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+		      MIPI_DSI_MODE_LPM,
+	.init = tianma_il79900a_init,
+};
+
 static int ili9882t_get_modes(struct drm_panel *panel,
 			      struct drm_connector *connector)
 {
@@ -680,6 +746,9 @@ static const struct of_device_id ili9882t_of_match[] = {
 	{ .compatible = "starry,ili9882t",
 	  .data = &starry_ili9882t_desc
 	},
+	{ .compatible = "tianma,tl121bvms07-00",
+	  .data = &tianma_tl121bvms07_desc
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, ili9882t_of_match);
-- 
2.34.1