media: staging: rkisp1: cap: enable RGB capture format with YUV media bus

In selfpath, RGB capture formats are received in the sink pad as YUV
and are converted to RGB only when writing to memory. So the validation
function should accept YUV bus formats with RGB capture encoding.
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/rkisp1/rkisp1-capture.c

@@ -1227,6 +1227,8 @@ static int rkisp1_capture_link_validate(struct media_link *link)
 		media_entity_to_v4l2_subdev(link->source->entity);
 	struct rkisp1_capture *cap = video_get_drvdata(vdev);
 	struct rkisp1_isp *isp = &cap->rkisp1->isp;
+	u8 isp_pix_enc = isp->src_fmt->pixel_enc;
+	u8 cap_pix_enc = cap->pix.info->pixel_enc;
 	struct v4l2_subdev_format sd_fmt;
 	int ret;
 
@@ -1237,7 +1239,9 @@ static int rkisp1_capture_link_validate(struct media_link *link)
 		return -EPIPE;
 	}
 
-	if (cap->pix.info->pixel_enc != isp->src_fmt->pixel_enc) {
+	if (cap_pix_enc != isp_pix_enc &&
+	    !(isp_pix_enc == V4L2_PIXEL_ENC_YUV &&
+	      cap_pix_enc == V4L2_PIXEL_ENC_RGB)) {
 		dev_err(cap->rkisp1->dev,
 			"format type mismatch in link '%s:%d->%s:%d'\n",
 			link->source->entity->name, link->source->index,