drm/panel: ltk050h3146w: add support for Leadtek LTK050H3148W-CTA6 variant

The LTK050H3148W-CTA6 is a 5.0" 720x1280 DSI display, whose driving
controller is a Himax HX8394-F, slightly different from LTK050H3146W by
its init sequence, mode details and mode flags.

Cc: Quentin Schulz <foss+kernel@0leil.net>
Signed-off-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220131164723.714836-2-quentin.schulz@theobroma-systems.com

drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c

@@ -244,6 +244,91 @@ struct ltk050h3146w *panel_to_ltk050h3146w(struct drm_panel *panel)
 	return container_of(panel, struct ltk050h3146w, panel);
 }
 
+static int ltk050h3148w_init_sequence(struct ltk050h3146w *ctx)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+	int ret;
+
+	/*
+	 * Init sequence was supplied by the panel vendor without much
+	 * documentation.
+	 */
+	mipi_dsi_dcs_write_seq(dsi, 0xb9, 0xff, 0x83, 0x94);
+	mipi_dsi_dcs_write_seq(dsi, 0xb1, 0x50, 0x15, 0x75, 0x09, 0x32, 0x44,
+			       0x71, 0x31, 0x55, 0x2f);
+	mipi_dsi_dcs_write_seq(dsi, 0xba, 0x63, 0x03, 0x68, 0x6b, 0xb2, 0xc0);
+	mipi_dsi_dcs_write_seq(dsi, 0xd2, 0x88);
+	mipi_dsi_dcs_write_seq(dsi, 0xb2, 0x00, 0x80, 0x64, 0x10, 0x07);
+	mipi_dsi_dcs_write_seq(dsi, 0xb4, 0x05, 0x70, 0x05, 0x70, 0x01, 0x70,
+			       0x01, 0x0c, 0x86, 0x75, 0x00, 0x3f, 0x01, 0x74,
+			       0x01, 0x74, 0x01, 0x74, 0x01, 0x0c, 0x86);
+	mipi_dsi_dcs_write_seq(dsi, 0xd3, 0x00, 0x00, 0x07, 0x07, 0x40, 0x1e,
+			       0x08, 0x00, 0x32, 0x10, 0x08, 0x00, 0x08, 0x54,
+			       0x15, 0x10, 0x05, 0x04, 0x02, 0x12, 0x10, 0x05,
+			       0x07, 0x33, 0x34, 0x0c, 0x0c, 0x37, 0x10, 0x07,
+			       0x17, 0x11, 0x40);
+	mipi_dsi_dcs_write_seq(dsi, 0xd5, 0x19, 0x19, 0x18, 0x18, 0x1b, 0x1b,
+			       0x1a, 0x1a, 0x04, 0x05, 0x06, 0x07, 0x00, 0x01,
+			       0x02, 0x03, 0x20, 0x21, 0x18, 0x18, 0x22, 0x23,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18);
+	mipi_dsi_dcs_write_seq(dsi, 0xd6, 0x18, 0x18, 0x19, 0x19, 0x1b, 0x1b,
+			       0x1a, 0x1a, 0x03, 0x02, 0x01, 0x00, 0x07, 0x06,
+			       0x05, 0x04, 0x23, 0x22, 0x18, 0x18, 0x21, 0x20,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18);
+	mipi_dsi_dcs_write_seq(dsi, 0xe0, 0x00, 0x03, 0x09, 0x11, 0x11, 0x14,
+			       0x18, 0x16, 0x2e, 0x3d, 0x4d, 0x4d, 0x58, 0x6c,
+			       0x72, 0x78, 0x88, 0x8b, 0x86, 0xa4, 0xb2, 0x58,
+			       0x55, 0x59, 0x5b, 0x5d, 0x60, 0x64, 0x7f, 0x00,
+			       0x03, 0x09, 0x0f, 0x11, 0x14, 0x18, 0x16, 0x2e,
+			       0x3d, 0x4d, 0x4d, 0x58, 0x6d, 0x73, 0x78, 0x88,
+			       0x8b, 0x87, 0xa5, 0xb2, 0x58, 0x55, 0x58, 0x5b,
+			       0x5d, 0x61, 0x65, 0x7f);
+	mipi_dsi_dcs_write_seq(dsi, 0xcc, 0x0b);
+	mipi_dsi_dcs_write_seq(dsi, 0xc0, 0x1f, 0x31);
+	mipi_dsi_dcs_write_seq(dsi, 0xb6, 0xc4, 0xc4);
+	mipi_dsi_dcs_write_seq(dsi, 0xbd, 0x01);
+	mipi_dsi_dcs_write_seq(dsi, 0xb1, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xbd, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, 0xc6, 0xef);
+	mipi_dsi_dcs_write_seq(dsi, 0xd4, 0x02);
+	mipi_dsi_dcs_write_seq(dsi, 0x11);
+	mipi_dsi_dcs_write_seq(dsi, 0x29);
+
+	ret = mipi_dsi_dcs_set_tear_on(dsi, 1);
+	if (ret < 0) {
+		dev_err(ctx->dev, "failed to set tear on: %d\n", ret);
+		return ret;
+	}
+
+	msleep(60);
+
+	return 0;
+}
+
+static const struct drm_display_mode ltk050h3148w_mode = {
+	.hdisplay	= 720,
+	.hsync_start	= 720 + 12,
+	.hsync_end	= 720 + 12 + 6,
+	.htotal		= 720 + 12 + 6 + 24,
+	.vdisplay	= 1280,
+	.vsync_start	= 1280 + 9,
+	.vsync_end	= 1280 + 9 + 2,
+	.vtotal		= 1280 + 9 + 2 + 16,
+	.clock		= 59756,
+	.width_mm	= 62,
+	.height_mm	= 110,
+};
+
+static const struct ltk050h3146w_desc ltk050h3148w_data = {
+	.mode = &ltk050h3148w_mode,
+	.init = ltk050h3148w_init_sequence,
+	.mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
+};
+
 static int ltk050h3146w_init_sequence(struct ltk050h3146w *ctx)
 {
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
@@ -646,6 +731,10 @@ static const struct of_device_id ltk050h3146w_of_match[] = {
 		.compatible = "leadtek,ltk050h3146w-a2",
 		.data = &ltk050h3146w_a2_data,
 	},
+	{
+		.compatible = "leadtek,ltk050h3148w",
+		.data = &ltk050h3148w_data,
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, ltk050h3146w_of_match);