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media: vb2: add requires_requests bit for stateless codecs

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Stateless codecs require the use of the Request API as opposed of it
being optional.

So add a bit to indicate this and let vb2 check for this.

If an attempt is made to queue a buffer without an associated request,
then the EBADR error is returned to userspace.

Doing this check in the vb2 core simplifies drivers, since they
don't have to check for this, they can just set this flag.

Signed-off-by: Hans Verkuil <[email protected]>
Reviewed-by: Paul Kocialkowski <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Hans Verkuil 2019-03-06 16:13:21 -05:00 • committed by Mauro Carvalho Chehab
commit 90675d391e
4 changed files with 20 additions and 0 deletions
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3
include/media/videobuf2-core.h
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@ -482,6 +482,8 @@ struct vb2_buf_ops {
* has not been called. This is a vb1 idiom that has been adopted
* also by vb2.
* @supports_requests: this queue supports the Request API.
* @requires_requests: this queue requires the Request API. If this is set to 1,
* then supports_requests must be set to 1 as well.
* @uses_qbuf: qbuf was used directly for this queue. Set to 1 the first
* time this is called. Set to 0 when the queue is canceled.
* If this is 1, then you cannot queue buffers from a request.
@ -556,6 +558,7 @@ struct vb2_queue {
unsigned allow_zero_bytesused:1;
unsigned quirk_poll_must_check_waiting_for_buffers:1;
unsigned supports_requests:1;
unsigned requires_requests:1;
unsigned uses_qbuf:1;
unsigned uses_requests:1;