/* Return a pointer to the ISP video instance at the far end of the pipeline. */
static int isp_video_get_graph_data(struct isp_video *video,
struct isp_pipeline *pipe)
{
struct media_entity_graph graph;
struct media_entity *entity = &video->video.entity;
struct media_device *mdev = entity->graph_obj.mdev;
struct isp_video *far_end = NULL;
int ret;
mutex_lock(&mdev->graph_mutex);
ret = media_entity_graph_walk_init(&graph, entity->graph_obj.mdev);
if (ret) {
mutex_unlock(&mdev->graph_mutex);
return ret;
}
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
struct isp_video *__video;
media_entity_enum_set(&pipe->ent_enum, entity);
if (far_end != NULL)
continue;
if (entity == &video->video.entity)
continue;
if (!is_media_entity_v4l2_video_device(entity))
continue;
__video = to_isp_video(media_entity_to_video_device(entity));
if (__video->type != video->type)
far_end = __video;
}
mutex_unlock(&mdev->graph_mutex);
media_entity_graph_walk_cleanup(&graph);
if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
pipe->input = far_end;
pipe->output = video;
} else {
if (far_end == NULL)
return -EPIPE;
pipe->input = video;
pipe->output = far_end;
}
return 0;
}
/*
* iss_pipeline_link_notify - Link management notification callback
* @link: The link
* @flags: New link flags that will be applied
*
* React to link management on powered pipelines by updating the use count of
* all entities in the source and sink sides of the link. Entities are powered
* on or off accordingly.
*
* Return 0 on success or a negative error code on failure. Powering entities
* off is assumed to never fail. This function will not fail for disconnection
* events.
*/
static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
unsigned int notification)
{
struct media_entity_graph *graph =
&container_of(link->graph_obj.mdev, struct iss_device,
media_dev)->pm_count_graph;
struct media_entity *source = link->source->entity;
struct media_entity *sink = link->sink->entity;
int source_use;
int sink_use;
int ret;
if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
ret = media_entity_graph_walk_init(graph,
link->graph_obj.mdev);
if (ret)
return ret;
}
source_use = iss_pipeline_pm_use_count(source, graph);
sink_use = iss_pipeline_pm_use_count(sink, graph);
if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
!(flags & MEDIA_LNK_FL_ENABLED)) {
/* Powering off entities is assumed to never fail. */
iss_pipeline_pm_power(source, -sink_use, graph);
iss_pipeline_pm_power(sink, -source_use, graph);
return 0;
}
if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
(flags & MEDIA_LNK_FL_ENABLED)) {
ret = iss_pipeline_pm_power(source, sink_use, graph);
if (ret < 0)
return ret;
ret = iss_pipeline_pm_power(sink, source_use, graph);
if (ret < 0)
iss_pipeline_pm_power(source, -sink_use, graph);
}
if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH)
media_entity_graph_walk_cleanup(graph);
return ret;
}
