drm/panel: st7703: Add Powkiddy RGB30 Panel Support

The Powkiddy RGB30 4 inch panel is a 4 inch 720x720 DSI panel used in
the Powkiddy RGB30 handheld gaming device. Add support for it.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013183918.225666-4-macroalpha82@gmail.com

drivers/gpu/drm/panel/panel-sitronix-st7703.c

@@ -433,6 +433,94 @@ static const struct st7703_panel_desc rg353v2_desc = {
 	.init_sequence = rg353v2_init_sequence,
 };
 
+static int rgb30panel_init_sequence(struct st7703 *ctx)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+
+	/* Init sequence extracted from Powkiddy RGB30 BSP kernel. */
+
+	/*
+	 * For some reason this specific panel must be taken out of sleep
+	 * before the full init sequence, or else it will not display.
+	 */
+	mipi_dsi_dcs_exit_sleep_mode(dsi);
+	msleep(250);
+
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC, 0xf1, 0x12, 0x83);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI, 0x33, 0x81, 0x05, 0xf9,
+			       0x0e, 0x0e, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x44, 0x25, 0x00, 0x90, 0x0a, 0x00,
+			       0x00, 0x01, 0x4f, 0x01, 0x00, 0x00, 0x37);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT, 0x25, 0x22, 0xf0,
+			       0x63);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_UNKNOWN_BF, 0x02, 0x11, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF, 0x10, 0x10, 0x28,
+			       0x28, 0x03, 0xff, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR, 0x73, 0x73, 0x50, 0x50,
+			       0x00, 0x00, 0x12, 0x70, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x46);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0b);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP, 0x3c, 0x12, 0x30);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ, 0x07, 0x07, 0x0b, 0x0b,
+			       0x03, 0x0b, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+			       0xc0, 0x10);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER, 0x36, 0x00, 0x32,
+			       0x32, 0x77, 0xf1, 0xcc, 0xcc, 0x77, 0x77, 0x33,
+			       0x33);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x0a, 0x0a);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x88, 0x88);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1, 0xc8, 0x10, 0x0a, 0x10,
+			       0x0f, 0xa1, 0x80, 0x12, 0x31, 0x23, 0x47, 0x86,
+			       0xa1, 0x80, 0x47, 0x08, 0x00, 0x00, 0x0d, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x00, 0x00,
+			       0x48, 0x02, 0x8b, 0xaf, 0x46, 0x02, 0x88, 0x88,
+			       0x88, 0x88, 0x88, 0x48, 0x13, 0x8b, 0xaf, 0x57,
+			       0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2, 0x96, 0x12, 0x01, 0x01,
+			       0x01, 0x78, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x4f, 0x31, 0x8b, 0xa8, 0x31, 0x75, 0x88, 0x88,
+			       0x88, 0x88, 0x88, 0x4f, 0x20, 0x8b, 0xa8, 0x20,
+			       0x64, 0x88, 0x88, 0x88, 0x88, 0x88, 0x23, 0x00,
+			       0x00, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x40, 0xa1, 0x80, 0x00, 0x00, 0x00,
+			       0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA, 0x00, 0x0a, 0x0f,
+			       0x29, 0x3b, 0x3f, 0x42, 0x39, 0x06, 0x0d, 0x10,
+			       0x13, 0x15, 0x14, 0x15, 0x10, 0x17, 0x00, 0x0a,
+			       0x0f, 0x29, 0x3b, 0x3f, 0x42, 0x39, 0x06, 0x0d,
+			       0x10, 0x13, 0x15, 0x14, 0x15, 0x10, 0x17);
+
+	return 0;
+}
+
+static const struct drm_display_mode rgb30panel_mode = {
+	.hdisplay	= 720,
+	.hsync_start	= 720 + 45,
+	.hsync_end	= 720 + 45 + 4,
+	.htotal		= 720 + 45 + 4 + 45,
+	.vdisplay	= 720,
+	.vsync_start	= 720 + 15,
+	.vsync_end	= 720 + 15 + 3,
+	.vtotal		= 720 + 15 + 3 + 11,
+	.clock		= 36570,
+	.flags		= DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+	.width_mm	= 76,
+	.height_mm	= 76,
+};
+
+static const struct st7703_panel_desc rgb30panel_desc = {
+	.mode = &rgb30panel_mode,
+	.lanes = 4,
+	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+		      MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_MODE_LPM,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init_sequence = rgb30panel_init_sequence,
+};
+
 static int st7703_enable(struct drm_panel *panel)
 {
 	struct st7703 *ctx = panel_to_st7703(panel);
@@ -696,6 +784,7 @@ static void st7703_remove(struct mipi_dsi_device *dsi)
 
 static const struct of_device_id st7703_of_match[] = {
 	{ .compatible = "anbernic,rg353v-panel-v2", .data = &rg353v2_desc },
+	{ .compatible = "powkiddy,rgb30-panel", .data = &rgb30panel_desc },
 	{ .compatible = "rocktech,jh057n00900", .data = &jh057n00900_panel_desc },
 	{ .compatible = "xingbangda,xbd599", .data = &xbd599_desc },
 	{ /* sentinel */ }