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media: vb2-core: vb2_buffer_done: consolidate docs 

Documentation about what start_streaming() should do on failure are
scattered in two places and mostly duplicated, so consolidate them in
one of the two places.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Pawel Osciak <pawel@osciak.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Luca Ceresoli 2018-03-08 07:26:20 -05:00 committed by Mauro Carvalho Chehab
parent dd328275e9
commit 45ad39999b
1 changed files with 4 additions and 6 deletions
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10
include/media/videobuf2-core.h
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@ -602,9 +602,7 @@ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
* Either %VB2_BUF_STATE_DONE if the operation finished
* successfully, %VB2_BUF_STATE_ERROR if the operation finished
* with an error or %VB2_BUF_STATE_QUEUED if the driver wants to
* requeue buffers. If start_streaming fails then it should return
* buffers with state %VB2_BUF_STATE_QUEUED to put them back into
* the queue.
* requeue buffers.
*
* This function should be called by the driver after a hardware operation on
* a buffer is finished and the buffer may be returned to userspace. The driver
@ -613,9 +611,9 @@ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
* to the driver by &vb2_ops->buf_queue can be passed to this function.
*
* While streaming a buffer can only be returned in state DONE or ERROR.
* The start_streaming op can also return them in case the DMA engine cannot
* be started for some reason. In that case the buffers should be returned with
* state QUEUED.
* The &vb2_ops->start_streaming op can also return them in case the DMA engine
* cannot be started for some reason. In that case the buffers should be
* returned with state QUEUED to put them back into the queue.
*/
void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);