media: entity: Add media_entity_has_route() function

This is a wrapper around the media entity has_route operation.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
State: pending

drivers/media/mc/mc-entity.c

@@ -314,6 +314,35 @@ static struct media_entity *stack_pop(struct media_graph *graph)
 #define link_top(en)	((en)->stack[(en)->top].link)
 #define stack_top(en)	((en)->stack[(en)->top].entity)
 
+/**
+ * media_entity_has_route - Check if two entity pads are connected internally
+ * @entity: The entity
+ * @pad0: The first pad index
+ * @pad1: The second pad index
+ *
+ * This function can be used to check whether two pads of an entity are
+ * connected internally in the entity.
+ *
+ * The caller must hold entity->source->parent->mutex.
+ *
+ * Return: true if the pads are connected internally and false otherwise.
+ */
+bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
+			    unsigned int pad1)
+{
+	if (pad0 >= entity->num_pads || pad1 >= entity->num_pads)
+		return false;
+
+	if (pad0 == pad1)
+		return true;
+
+	if (!entity->ops || !entity->ops->has_route)
+		return true;
+
+	return entity->ops->has_route(entity, pad0, pad1);
+}
+EXPORT_SYMBOL_GPL(media_entity_has_route);
+
 /**
  * media_graph_walk_init - Allocate resources for graph walk
  * @graph: Media graph structure that will be used to walk the graph

include/media/media-entity.h

@@ -1110,6 +1110,9 @@ __must_check int media_graph_walk_init(
  */
 void media_graph_walk_cleanup(struct media_graph *graph);
 
+bool media_entity_has_route(struct media_entity *entity, unsigned int sink,
+			    unsigned int source);
+
 /**
  * media_graph_walk_start - Start walking the media graph at a
  *	given entity