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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-06-14 20:11:10 +0100
committerMauro Carvalho Chehab <mchehab@kernel.org>2022-07-17 11:23:51 +0100
commit03b282861ca737b7e2dfb9a1e4a2a4a7e3594688 (patch)
tree3ffef33f6bc21ac7cd7e94c38987de12ff919d14 /drivers/media
parent5680fe45d66bbef32a902c04889a523fa4fc33ba (diff)
media: mc-entity: Add a new helper function to get a remote pad for a pad
The newly added media_entity_remote_source_pad_unique() helper function handles use cases where the entity has a link enabled uniqueness constraint covering all pads. There are use cases where the constraint covers a specific pad only. Add a new media_pad_remote_pad_unique() function to handle this. It operates as media_entity_remote_source_pad_unique(), but on a given pad instead of on the entity. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/mc/mc-entity.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c
index 767846b216c5..afd1bd7ff7b6 100644
--- a/drivers/media/mc/mc-entity.c
+++ b/drivers/media/mc/mc-entity.c
@@ -960,6 +960,37 @@ media_entity_remote_pad_unique(const struct media_entity *entity,
}
EXPORT_SYMBOL_GPL(media_entity_remote_pad_unique);
+struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad)
+{
+ struct media_pad *found_pad = NULL;
+ struct media_link *link;
+
+ list_for_each_entry(link, &pad->entity->links, list) {
+ struct media_pad *remote_pad;
+
+ if (!(link->flags & MEDIA_LNK_FL_ENABLED))
+ continue;
+
+ if (link->sink == pad)
+ remote_pad = link->source;
+ else if (link->source == pad)
+ remote_pad = link->sink;
+ else
+ continue;
+
+ if (found_pad)
+ return ERR_PTR(-ENOTUNIQ);
+
+ found_pad = remote_pad;
+ }
+
+ if (!found_pad)
+ return ERR_PTR(-ENOLINK);
+
+ return found_pad;
+}
+EXPORT_SYMBOL_GPL(media_pad_remote_pad_unique);
+
static void media_interface_init(struct media_device *mdev,
struct media_interface *intf,
u32 gobj_type,