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[media] media: platform: pxa_camera: change stop_streaming semantics 

Instead of the legacy behavior where it was required to wait for all
video buffers to be finished by the hardware, use a cancel like strategy
: as soon as the stop_streaming() call is done, abort all DMA transfers,
report the already buffers as failed and return.

This makes stop_streaming() more a "cancel capture" than a "wait for end
of capture" semantic.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Robert Jarzmik 2016-09-06 06:04:22 -03:00 committed by Mauro Carvalho Chehab
parent cdd657eb44
commit fcdf9bbc91
1 changed files with 12 additions and 3 deletions
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15
drivers/media/platform/soc_camera/pxa_camera.c
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@ -523,7 +523,8 @@ static void pxa_camera_stop_capture(struct pxa_camera_dev *pcdev)
}
static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev,
struct pxa_buffer *buf)
struct pxa_buffer *buf,
enum vb2_buffer_state state)
{
struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
@ -645,7 +646,7 @@ static void pxa_camera_dma_irq(struct pxa_camera_dev *pcdev,
}
buf->active_dma &= ~act_dma;
if (!buf->active_dma) {
pxa_camera_wakeup(pcdev, buf);
pxa_camera_wakeup(pcdev, buf, VB2_BUF_STATE_DONE);
pxa_camera_check_link_miss(pcdev, last_buf->cookie[chan],
last_issued);
}
@ -1087,7 +1088,15 @@ static int pxac_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
static void pxac_vb2_stop_streaming(struct vb2_queue *vq)
{
vb2_wait_for_all_buffers(vq);
struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);
struct pxa_buffer *buf, *tmp;
dev_dbg(pcdev_to_dev(pcdev), "%s active=%p\n",
__func__, pcdev->active);
pxa_camera_stop_capture(pcdev);
list_for_each_entry_safe(buf, tmp, &pcdev->capture, queue)
pxa_camera_wakeup(pcdev, buf, VB2_BUF_STATE_ERROR);
}
static struct vb2_ops pxac_vb2_ops = {