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media: usbtv: Implement wait_prepare and wait_finish 

This driver is currently specifying a vb2_queue lock,
which means it straightforward to implement wait_prepare
and wait_finish.

Having these callbacks releases the queue lock while blocking,
which improves latency by allowing for example streamoff
or qbuf operations while waiting in dqbuf.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Ezequiel Garcia 2018-05-10 20:17:20 -04:00 committed by Mauro Carvalho Chehab
parent 8ed8bba70b
commit 24dd8d996f
1 changed files with 2 additions and 0 deletions
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2
drivers/media/usb/usbtv/usbtv-video.c
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@ -781,6 +781,8 @@ static const struct vb2_ops usbtv_vb2_ops = {
.buf_queue = usbtv_buf_queue,
.start_streaming = usbtv_start_streaming,
.stop_streaming = usbtv_stop_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static int usbtv_s_ctrl(struct v4l2_ctrl *ctrl)