[media] rcar-vin: use pad information when verifying media bus format

Use information about pad index when enumerating mbus codes.
Signed-off-by: NNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/rcar-vin/rcar-core.c

@@ -53,6 +53,7 @@ static bool rvin_mbus_supported(struct rvin_graph_entity *entity)
 	};
 
 	code.index = 0;
+	code.pad = entity->source_pad;
 	while (!v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code)) {
 		code.index++;
 		switch (code.code) {