[i.MX8][C43][C26] Apply NXP patch for HDMI-IN working

drivers/staging/media/imx/hdmirx/cdns-hdmirx.c

@@ -480,6 +480,33 @@ static int hdmirx_s_stream(struct v4l2_subdev *sd, int enable)
 	return 0;
 }
 
+static int mxc_hdmi_link_setup(struct media_entity *entity,
+			       const struct media_pad *local,
+			       const struct media_pad *remote, u32 flags)
+{
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct platform_device *pdev = v4l2_get_subdevdata(sd);
+
+	if (local->flags & MEDIA_PAD_FL_SOURCE) {
+		switch (local->index) {
+		case MXC_HDMI_RX_PAD_SOURCE:
+			break;
+		default:
+			dev_err(&pdev->dev, "%s invalid source pad\n", __func__);
+			return -EINVAL;
+		}
+	} else if (local->flags & MEDIA_PAD_FL_SINK) {
+		switch (local->index) {
+		case MXC_HDMI_RX_PAD_SINK:
+			break;
+		default:
+			dev_err(&pdev->dev, "%s invalid sink pad\n", __func__);
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
 static const struct v4l2_subdev_video_ops cdns_video_ops_hdmi = {
 	.s_stream = hdmirx_s_stream,
 	.g_parm =	hdmirx_g_parm,
@@ -491,6 +518,7 @@ static const struct v4l2_subdev_video_ops cdns_video_ops_hdmi = {
  */
 
 static const struct media_entity_operations hdmi_media_ops = {
+	.link_setup = mxc_hdmi_link_setup,
 	.link_validate = v4l2_subdev_link_validate,
 };
 
@@ -564,9 +592,6 @@ static int hdmirx_get_format(struct v4l2_subdev *sd,
 		return -EINVAL;
 	}
 
-	if (sdformat->pad != MXC_HDMI_RX_PAD_SOURCE)
-		return -EINVAL;
-
 	switch (hdmirx->pixel_encoding) {
 	case PIXEL_ENCODING_YUV422:
 		mbusformat->code = MEDIA_BUS_FMT_YUYV8_1X16;