Em Mon, 11 Dec 2017 16:27:36 -0200
Gustavo Padovan <gustavo@xxxxxxxxxxx> escreveu:
> From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxx>
>
> Explicit synchronization benefits a lot from ordered queues, they fit
> better in a pipeline with DRM for example so create a opt-in way for
> drivers notify videobuf2 that the queue is unordered.
>
> Drivers don't need implement it if the queue is ordered.
>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxx>
> ---
> include/media/videobuf2-core.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index ef9b64398c8c..eddb38a2a2f3 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -368,6 +368,9 @@ struct vb2_buffer {
> * callback by calling vb2_buffer_done() with either
> * %VB2_BUF_STATE_DONE or %VB2_BUF_STATE_ERROR; may use
> * vb2_wait_for_all_buffers() function
> + * @is_unordered: tell if the queue format is unordered. The default is
> + * assumed to be ordered and this function only needs to
> + * be implemented for unordered queues.
> * @buf_queue: passes buffer vb to the driver; driver may start
> * hardware operation on this buffer; driver should give
> * the buffer back by calling vb2_buffer_done() function;
> @@ -391,6 +394,7 @@ struct vb2_ops {
>
> int (*start_streaming)(struct vb2_queue *q, unsigned int count);
> void (*stop_streaming)(struct vb2_queue *q);
> + int (*is_unordered)(struct vb2_queue *q);
>
> void (*buf_queue)(struct vb2_buffer *vb);
> };
> @@ -564,6 +568,7 @@ struct vb2_queue {
> u32 cnt_wait_finish;
> u32 cnt_start_streaming;
> u32 cnt_stop_streaming;
> + u32 cnt_is_unordered;
If I understand, this is just a bit, right?
if so, better to declare it as:
u32 cnt_is_unordered : 1;
> #endif
> };
>
--
Thanks,
Mauro
