diff mbox series

[v7,12/27] media: entity: Add an iterator helper for connected pads

Message ID 20210524104408.599645-13-tomi.valkeinen@ideasonboard.com
State Superseded
Headers show
Series v4l: subdev internal routing and streams | expand

Commit Message

Tomi Valkeinen May 24, 2021, 10:43 a.m. UTC 
From: Sakari Ailus <sakari.ailus@linux.intel.com>

Add a helper macro for iterating over pads that are connected through
enabled routes. This can be used to find all the connected pads within an
entity, for instance starting from the pad which has been obtained during
the graph walk.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

- Make __media_entity_next_routed_pad() return NULL and adjust the
  iterator to handle that
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/mc/mc-entity.c | 14 ++++++++++++++
 include/media/media-entity.h | 26 ++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c
index 2ff0ae4c13c1..71dd14dd6c4d 100644
--- a/drivers/media/mc/mc-entity.c
+++ b/drivers/media/mc/mc-entity.c
@@ -248,6 +248,20 @@  bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
 }
 EXPORT_SYMBOL_GPL(media_entity_has_route);
 
+struct media_pad *__media_entity_next_routed_pad(struct media_pad *root,
+						 struct media_pad *iter)
+{
+	struct media_entity *entity = root->entity;
+
+	for (; iter < &entity->pads[entity->num_pads]; iter++) {
+		if (media_entity_has_route(entity, root->index, iter->index))
+			return iter;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(__media_entity_next_routed_pad);
+
 /* push an entity to traversal stack */
 static void stack_push(struct media_graph *graph, struct media_pad *pad)
 {
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index b3069eef7fdb..cd1750e495df 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -921,6 +921,32 @@  __must_check int media_graph_walk_init(
 bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
 			    unsigned int pad1);
 
+/**
+ * __media_entity_next_routed_pad - Get next pad connected to @root
+ *
+ * @root: The root pad to which the iterated pads have a route
+ * @iter: The iterator pad
+ *
+ * Get next pad which has a route to @root.
+ */
+struct media_pad *__media_entity_next_routed_pad(struct media_pad *root,
+						 struct media_pad *iter);
+
+/**
+ * media_entity_for_each_routed_pad - Iterate over entity pads connected by routes
+ *
+ * @root: The root pad to which the iterated pads have a route
+ * @iter: The iterator pad
+ *
+ * Iterate over all pads of an entity which have an internal route to @root pad.
+ * The iteration will include the @root pad itself.
+ */
+#define media_entity_for_each_routed_pad(root, iter)                           \
+	for (iter = __media_entity_next_routed_pad(root,                       \
+						   (root)->entity->pads);      \
+	     iter != NULL;                                                     \
+	     iter = __media_entity_next_routed_pad(root, iter + 1))
+
 /**
  * media_graph_walk_cleanup - Release resources used by graph walk.
  *