drm/panel: himax-hx8394: Add Support for Microchip AC40T08A MIPI Display Panel

Add support for the Microchip AC40T08A MIPI Display panel. This panel uses
a Himax HX8394 display controller and requires a vendor provided init
sequence. The display resolution is 720x1280@60Hz with width and height
of 76mm and 132mm respectively.
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240701085837.50855-4-manikandan.m@microchip.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240701085837.50855-4-manikandan.m@microchip.com

drivers/gpu/drm/panel/panel-himax-hx8394.c

@@ -339,6 +339,156 @@ static const struct hx8394_panel_desc powkiddy_x55_desc = {
 	.init_sequence = powkiddy_x55_init_sequence,
 };
 
+static int mchp_ac40t08a_init_sequence(struct hx8394 *ctx)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+
+	/* DCS commands do not seem to be sent correclty without this delay */
+	msleep(20);
+
+	/* 5.19.8 SETEXTC: Set extension command (B9h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETEXTC,
+			       0xff, 0x83, 0x94);
+
+	/* 5.19.9 SETMIPI: Set MIPI control (BAh) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETMIPI,
+			       0x63, 0x03, 0x68, 0x6b, 0xb2, 0xc0);
+
+	/* 5.19.2 SETPOWER: Set power (B1h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETPOWER,
+			       0x48, 0x12, 0x72, 0x09, 0x32, 0x54,
+			       0x71, 0x71, 0x57, 0x47);
+
+	/* 5.19.3 SETDISP: Set display related register (B2h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETDISP,
+			       0x00, 0x80, 0x64, 0x0c, 0x0d, 0x2f);
+
+	/* 5.19.4 SETCYC: Set display waveform cycles (B4h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETCYC,
+			       0x73, 0x74, 0x73, 0x74, 0x73, 0x74,
+			       0x01, 0x0c, 0x86, 0x75, 0x00, 0x3f,
+			       0x73, 0x74, 0x73, 0x74, 0x73, 0x74,
+			       0x01, 0x0c, 0x86);
+
+	/* 5.19.5 SETVCOM: Set VCOM voltage (B6h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETVCOM,
+			       0x6e, 0x6e);
+
+	/* 5.19.19 SETGIP0: Set GIP Option0 (D3h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETGIP0,
+			       0x00, 0x00, 0x07, 0x07, 0x40, 0x07,
+			       0x0c, 0x00, 0x08, 0x10, 0x08, 0x00,
+			       0x08, 0x54, 0x15, 0x0a, 0x05, 0x0a,
+			       0x02, 0x15, 0x06, 0x05, 0x06, 0x47,
+			       0x44, 0x0a, 0x0a, 0x4b, 0x10, 0x07,
+			       0x07, 0x0c, 0x40);
+
+	/* 5.19.20 Set GIP Option1 (D5h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETGIP1,
+			       0x1c, 0x1c, 0x1d, 0x1d, 0x00, 0x01,
+			       0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			       0x08, 0x09, 0x0a, 0x0b, 0x24, 0x25,
+			       0x18, 0x18, 0x26, 0x27, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x20, 0x21, 0x18, 0x18,
+			       0x18, 0x18);
+
+	/* 5.19.21 Set GIP Option2 (D6h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETGIP2,
+			       0x1c, 0x1c, 0x1d, 0x1d, 0x07, 0x06,
+			       0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+			       0x0b, 0x0a, 0x09, 0x08, 0x21, 0x20,
+			       0x18, 0x18, 0x27, 0x26, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
+			       0x18, 0x18, 0x25, 0x24, 0x18, 0x18,
+			       0x18, 0x18);
+
+	/* 5.19.25 SETGAMMA: Set gamma curve related setting (E0h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETGAMMA,
+			       0x00, 0x0a, 0x15, 0x1b, 0x1e, 0x21,
+			       0x24, 0x22, 0x47, 0x56, 0x65, 0x66,
+			       0x6e, 0x82, 0x88, 0x8b, 0x9a, 0x9d,
+			       0x98, 0xa8, 0xb9, 0x5d, 0x5c, 0x61,
+			       0x66, 0x6a, 0x6f, 0x7f, 0x7f, 0x00,
+			       0x0a, 0x15, 0x1b, 0x1e, 0x21, 0x24,
+			       0x22, 0x47, 0x56, 0x65, 0x65, 0x6e,
+			       0x81, 0x87, 0x8b, 0x98, 0x9d, 0x99,
+			       0xa8, 0xba, 0x5d, 0x5d, 0x62, 0x67,
+			       0x6b, 0x72, 0x7f, 0x7f);
+
+	/* Unknown command, not listed in the HX8394-F datasheet (C0H) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_UNKNOWN1,
+			       0x1f, 0x73);
+
+	/* Set CABC control (C9h)*/
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETCABC,
+			       0x76, 0x00, 0x30);
+
+	/* 5.19.17 SETPANEL (CCh) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETPANEL,
+			       0x0b);
+
+	/* Unknown command, not listed in the HX8394-F datasheet (D4h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_UNKNOWN3,
+			       0x02);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETREGBANK,
+			       0x02);
+
+	/* 5.19.11 Set register bank (D8h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_UNKNOWN4,
+			       0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+			       0xff, 0xff, 0xff, 0xff, 0xff, 0xff);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETREGBANK,
+			       0x00);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETREGBANK,
+			       0x01);
+
+	/* 5.19.2 SETPOWER: Set power (B1h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETPOWER,
+			       0x00);
+
+	/* 5.19.11 Set register bank (BDh) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_SETREGBANK,
+			       0x00);
+
+	/* Unknown command, not listed in the HX8394-F datasheet (C6h) */
+	mipi_dsi_dcs_write_seq(dsi, HX8394_CMD_UNKNOWN2,
+			       0xed);
+
+	return 0;
+}
+
+static const struct drm_display_mode mchp_ac40t08a_mode = {
+	.hdisplay    = 720,
+	.hsync_start = 720 + 12,
+	.hsync_end   = 720 + 12 + 24,
+	.htotal	     = 720 + 12 + 12 + 24,
+	.vdisplay    = 1280,
+	.vsync_start = 1280 + 13,
+	.vsync_end   = 1280 + 14,
+	.vtotal	     = 1280 + 14 + 13,
+	.clock	     = 60226,
+	.flags	     = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+	.width_mm    = 76,
+	.height_mm   = 132,
+};
+
+static const struct hx8394_panel_desc mchp_ac40t08a_desc = {
+	.mode = &mchp_ac40t08a_mode,
+	.lanes = 4,
+	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST,
+	.format = MIPI_DSI_FMT_RGB888,
+	.init_sequence = mchp_ac40t08a_init_sequence,
+};
+
 static int hx8394_enable(struct drm_panel *panel)
 {
 	struct hx8394 *ctx = panel_to_hx8394(panel);
@@ -555,6 +705,7 @@ static void hx8394_remove(struct mipi_dsi_device *dsi)
 static const struct of_device_id hx8394_of_match[] = {
 	{ .compatible = "hannstar,hsd060bhw4", .data = &hsd060bhw4_desc },
 	{ .compatible = "powkiddy,x55-panel", .data = &powkiddy_x55_desc },
+	{ .compatible = "microchip,ac40t08a-mipi-panel", .data = &mchp_ac40t08a_desc },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, hx8394_of_match);