diff mbox series

[RFC,10/11] v4l: subdev: add V4L2_SUBDEV_FL_MULTIPLEXED

Message ID 20210507123558.146948-11-tomi.valkeinen@ideasonboard.com
State Superseded
Headers show
Series v4l2: multistream support via stream based configuration | expand

Commit Message

Tomi Valkeinen May 7, 2021, 12:35 p.m. UTC 
Add V4L2_SUBDEV_FL_MULTIPLEXED, which indicates that the subdev supports
routing and per-stream configuration. These drivers do not need the old
pad based configuration, so we can skip the allocation in
v4l2_subdev_alloc_state().

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 3 ++-
 include/media/v4l2-subdev.h           | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 0acc2607b78c..f5cca45becf4 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1188,7 +1188,8 @@  struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd)
 		goto err;
 	}
 
-	if (sd->entity.num_pads) {
+	/* Drivers that support streams do not need the legacy pad config */
+	if (!(sd->flags & V4L2_SUBDEV_FL_MULTIPLEXED) && sd->entity.num_pads) {
 		state->pads = kvmalloc_array(sd->entity.num_pads,
 					     sizeof(*state->pads),
 					     GFP_KERNEL | __GFP_ZERO);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 1c3de4a0606e..cc9953d88ce2 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -900,6 +900,12 @@  struct v4l2_subdev_internal_ops {
  * should set this flag.
  */
 #define V4L2_SUBDEV_FL_HAS_EVENTS		(1U << 3)
+/*
+ * Set this flag if this subdev supports multiplexed streams. This means
+ * that the driver supports routing and handles the stream parameter in its
+ * v4l2_subdev_pad_ops handlers.
+ */
+#define V4L2_SUBDEV_FL_MULTIPLEXED		(1U << 4)
 
 struct regulator_bulk_data;