Diffstat (limited to 'Documentation/media-framework.txt')
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/media-framework.txt b/Documentation/media-framework.txt
index 3a0f879..8028754 100644
@@ -335,6 +335,9 @@ the media_entity pipe field.
Calls to media_entity_pipeline_start() can be nested. The pipeline pointer must
be identical for all nested calls to the function.
+media_entity_pipeline_start() may return an error. In that case, it will
+clean up any the changes it did by itself.
When stopping the stream, drivers must notify the entities with
media_entity_pipeline_stop(struct media_entity *entity);
@@ -351,3 +354,19 @@ If other operations need to be disallowed on streaming entities (such as
changing entities configuration parameters) drivers can explicitly check the
media_entity stream_count field to find out if an entity is streaming. This
operation must be done with the media_device graph_mutex held.
+Link validation is performed by media_entity_pipeline_start() for any
+entity which has sink pads in the pipeline. The
+media_entity::link_validate() callback is used for that purpose. In
+link_validate() callback, entity driver should check that the properties of
+the source pad of the connected entity and its own sink pad match. It is up
+to the type of the entity (and in the end, the properties of the hardware)
+what matching actually means.
+Subsystems should facilitate link validation by providing subsystem specific
+helper functions to provide easy access for commonly needed information, and
+in the end provide a way to use driver-specific callbacks.