drm/panel: st7703: Add GameForce Chi Panel Support

The GameForce Chi is a handheld device with a 3.5" 640x480 ST7703 based
display panel.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Link: https://lore.kernel.org/r/20240325134959.11807-4-macroalpha82@gmail.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240325134959.11807-4-macroalpha82@gmail.com

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

@@ -612,6 +612,92 @@ static const struct st7703_panel_desc rgb10max3_panel_desc = {
 	.init_sequence = rgb10max3_panel_init_sequence,
 };
 
+static int gameforcechi_init_sequence(struct st7703 *ctx)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+
+	/*
+	 * Init sequence was supplied by the panel vendor. Panel will not
+	 * respond to commands until it is brought out of sleep mode first.
+	 */
+
+	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, 0x31, 0x81, 0x05, 0xf9,
+			       0x0e, 0x0e, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x44, 0x25, 0x00, 0x91, 0x0a, 0x00,
+			       0x00, 0x02, 0x4f, 0xd1, 0x00, 0x00, 0x37);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT, 0x25);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_UNKNOWN_BF, 0x02, 0x11, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF, 0x0c, 0x10, 0x0a,
+			       0x50, 0x03, 0xff, 0x00, 0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR, 0x73, 0x73, 0x50, 0x50,
+			       0x00, 0x00, 0x08, 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, 0x00, 0x13, 0xf0);
+	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, 0x53, 0x00, 0x1e,
+			       0x1e, 0x77, 0xe1, 0xcc, 0xdd, 0x67, 0x77, 0x33,
+			       0x33);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x10, 0x10);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x6c, 0x7c);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1, 0x08, 0x00, 0x0e, 0x00,
+			       0x00, 0xb0, 0xb1, 0x11, 0x31, 0x23, 0x28, 0x10,
+			       0xb0, 0xb1, 0x27, 0x08, 0x00, 0x04, 0x02, 0x00,
+			       0x00, 0x00, 0x00, 0x04, 0x02, 0x00, 0x00, 0x00,
+			       0x88, 0x88, 0xba, 0x60, 0x24, 0x08, 0x88, 0x88,
+			       0x88, 0x88, 0x88, 0x88, 0x88, 0xba, 0x71, 0x35,
+			       0x18, 0x88, 0x88, 0x88, 0x88, 0x88, 0x00, 0x00,
+			       0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2, 0x97, 0x0a, 0x82, 0x02,
+			       0x13, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x80, 0x88, 0xba, 0x17, 0x53, 0x88, 0x88, 0x88,
+			       0x88, 0x88, 0x88, 0x81, 0x88, 0xba, 0x06, 0x42,
+			       0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x23, 0x10,
+			       0x00, 0x02, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			       0x00);
+	mipi_dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA, 0x00, 0x07, 0x0b,
+			       0x27, 0x2d, 0x3f, 0x3b, 0x37, 0x05, 0x0a, 0x0b,
+			       0x0f, 0x11, 0x0f, 0x12, 0x12, 0x18, 0x00, 0x07,
+			       0x0b, 0x27, 0x2d, 0x3f, 0x3b, 0x37, 0x05, 0xa0,
+			       0x0b, 0x0f, 0x11, 0x0f, 0x12, 0x12, 0x18);
+
+	return 0;
+}
+
+static const struct drm_display_mode gameforcechi_mode = {
+	.hdisplay	= 640,
+	.hsync_start	= 640 + 40,
+	.hsync_end	= 640 + 40 + 2,
+	.htotal		= 640 + 40 + 2 + 80,
+	.vdisplay	= 480,
+	.vsync_start	= 480 + 17,
+	.vsync_end	= 480 + 17 + 5,
+	.vtotal		= 480 + 17 + 5 + 13,
+	.clock		= 23546,
+	.flags		= DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+	.width_mm	= 71,
+	.height_mm	= 53,
+};
+
+static const struct st7703_panel_desc gameforcechi_desc = {
+	.mode = &gameforcechi_mode,
+	.lanes = 2,
+	.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 = gameforcechi_init_sequence,
+};
+
 static int st7703_enable(struct drm_panel *panel)
 {
 	struct st7703 *ctx = panel_to_st7703(panel);
@@ -887,6 +973,7 @@ 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 = "gameforce,chi-panel", .data = &gameforcechi_desc },
 	{ .compatible = "powkiddy,rgb10max3-panel", .data = &rgb10max3_panel_desc },
 	{ .compatible = "powkiddy,rgb30-panel", .data = &rgb30panel_desc },
 	{ .compatible = "rocktech,jh057n00900", .data = &jh057n00900_panel_desc },