@@ -1053,6 +1053,51 @@ __media_pipeline_entity_iter_next(struct media_pipeline *pipe,
}
EXPORT_SYMBOL_GPL(__media_pipeline_entity_iter_next);
+int media_pipeline_started(struct media_pipeline *pipe)
+{
+ struct media_pipeline_entity_iter iter;
+ struct media_entity *entity;
+ int ret;
+
+ ret = media_pipeline_entity_iter_init(pipe, &iter);
+ if (ret)
+ return ret;
+
+ media_pipeline_for_each_entity(pipe, &iter, entity) {
+ ret = media_entity_call(entity, pipeline_started);
+ if (ret && ret != -ENOIOCTLCMD)
+ goto err_notify_stopped;
+ }
+
+ media_pipeline_entity_iter_cleanup(&iter);
+
+ return ret == -ENOIOCTLCMD ? 0 : ret;
+
+err_notify_stopped:
+ media_pipeline_stopped(pipe);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(media_pipeline_started);
+
+int media_pipeline_stopped(struct media_pipeline *pipe)
+{
+ struct media_pipeline_entity_iter iter;
+ struct media_entity *entity;
+ int ret;
+
+ ret = media_pipeline_entity_iter_init(pipe, &iter);
+ if (ret)
+ return ret;
+
+ media_pipeline_for_each_entity(pipe, &iter, entity)
+ media_entity_call(entity, pipeline_stopped);
+
+ media_pipeline_entity_iter_cleanup(&iter);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(media_pipeline_stopped);
+
/* -----------------------------------------------------------------------------
* Links management
*/
@@ -269,6 +269,10 @@ struct media_pad {
* media_entity_has_pad_interdep().
* Optional: If the operation isn't implemented all pads
* will be considered as interdependent.
+ * @pipeline_started: Notify this entity that the pipeline it is a part of has
+ * been started
+ * @pipeline_stopped: Notify this entity that the pipeline it is a part of has
+ * been stopped
*
* .. note::
*
@@ -284,6 +288,8 @@ struct media_entity_operations {
int (*link_validate)(struct media_link *link);
bool (*has_pad_interdep)(struct media_entity *entity, unsigned int pad0,
unsigned int pad1);
+ int (*pipeline_started)(struct media_entity *entity);
+ void (*pipeline_stopped)(struct media_entity *entity);
};
/**
@@ -1261,6 +1267,24 @@ __media_pipeline_entity_iter_next(struct media_pipeline *pipe,
entity != NULL; \
entity = __media_pipeline_entity_iter_next((pipe), iter, entity))
+/**
+ * media_pipeline_started - Inform entities in a pipeline that it has started
+ * @pipe: The pipeline
+ *
+ * Iterate on all entities in a media pipeline and call their pipeline_started
+ * member of media_entity_operations.
+ */
+int media_pipeline_started(struct media_pipeline *pipe);
+
+/**
+ * media_pipeline_stopped - Inform entities in a pipeline that it has stopped
+ * @pipe: The pipeline
+ *
+ * Iterate on all entities in a media pipeline and call their pipeline_stopped
+ * member of media_entity_operations.
+ */
+int media_pipeline_stopped(struct media_pipeline *pipe);
+
/**
* media_pipeline_alloc_start - Mark a pipeline as streaming
* @pad: Starting pad
Add two new members to struct media_entity_operations, along with new functions in media-entity.c to traverse a media pipeline and call the new operations. The new functions are intended to be used to signal to a media pipeline that it has fully started, with the entity ops allowing drivers to define some action to be taken when those conditions are met. The combination of the new functions and operations allows drivers which are part of a multi-driver pipeline to delay actually starting streaming until all of the conditions for streaming succcessfully are met across all drivers. Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> --- drivers/media/mc/mc-entity.c | 45 ++++++++++++++++++++++++++++++++++++ include/media/media-entity.h | 24 +++++++++++++++++++ 2 files changed, 69 insertions(+)