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V4L/DVB: mx2_camera: implement forced termination of active buffer for mx25

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This allows userspace to terminate a capture without waiting for the current
frame to complete.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Baruch Siach 2010-07-27 09:06:10 -03:00 committed by Mauro Carvalho Chehab
parent 88bfd0bd7f
commit 7c6b731970
1 changed files with 16 additions and 4 deletions
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20
drivers/media/video/mx2_camera.c
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@ -640,15 +640,27 @@ static void mx2_videobuf_release(struct videobuf_queue *vq,
* Terminate only queued but inactive buffers. Active buffers are
* released when they become inactive after videobuf_waiton().
*
* FIXME: implement forced termination of active buffers, so that the
* user won't get stuck in an uninterruptible state. This requires a
* specific handling for each of the three DMA types that this driver
* supports.
* FIXME: implement forced termination of active buffers for mx27 and
* mx27 eMMA, so that the user won't get stuck in an uninterruptible
* state. This requires a specific handling for each of the these DMA
* types.
*/
spin_lock_irqsave(&pcdev->lock, flags);
if (vb->state == VIDEOBUF_QUEUED) {
list_del(&vb->queue);
vb->state = VIDEOBUF_ERROR;
} else if (cpu_is_mx25() && vb->state == VIDEOBUF_ACTIVE) {
if (pcdev->fb1_active == buf) {
pcdev->csicr1 &= ~CSICR1_FB1_DMA_INTEN;
writel(0, pcdev->base_csi + CSIDMASA_FB1);
pcdev->fb1_active = NULL;
} else if (pcdev->fb2_active == buf) {
pcdev->csicr1 &= ~CSICR1_FB2_DMA_INTEN;
writel(0, pcdev->base_csi + CSIDMASA_FB2);
pcdev->fb2_active = NULL;
}
writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
vb->state = VIDEOBUF_ERROR;
}
spin_unlock_irqrestore(&pcdev->lock, flags);