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[media] v4l2-pci-skeleton.c: fix alternate field handling

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For interlaced HDTV timings the correct field setting is FIELD_ALTERNATE,
not INTERLACED. Update this template driver accordingly:

- add check for the invalid combination of read() and FIELD_ALTERNATE.
- in the interrupt handler set v4l2_buffer field to alternating TOP and
  BOTTOM.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil 2014-04-11 05:02:29 -03:00 committed by Mauro Carvalho Chehab
parent b050b29e07
commit 5f26f2501b
1 changed files with 28 additions and 11 deletions
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39
Documentation/video4linux/v4l2-pci-skeleton.c
View file

@ -77,7 +77,8 @@ struct skeleton {
spinlock_t qlock;
struct list_head buf_list;
unsigned int sequence;
unsigned field;
unsigned sequence;
};
struct skel_buffer {
@ -124,7 +125,7 @@ static const struct v4l2_dv_timings_cap skel_timings_cap = {
* Interrupt handler: typically interrupts happen after a new frame has been
* captured. It is the job of the handler to remove the new frame from the
* internal list and give it back to the vb2 framework, updating the sequence
* counter and timestamp at the same time.
* counter, field and timestamp at the same time.
*/
static irqreturn_t skeleton_irq(int irq, void *dev_id)
{
@ -139,8 +140,15 @@ static irqreturn_t skeleton_irq(int irq, void *dev_id)
spin_lock(&skel->qlock);
list_del(&new_buf->list);
spin_unlock(&skel->qlock);
new_buf->vb.v4l2_buf.sequence = skel->sequence++;
v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
new_buf->vb.v4l2_buf.sequence = skel->sequence++;
new_buf->vb.v4l2_buf.field = skel->field;
if (skel->format.field == V4L2_FIELD_ALTERNATE) {
if (skel->field == V4L2_FIELD_BOTTOM)
skel->field = V4L2_FIELD_TOP;
else if (skel->field == V4L2_FIELD_TOP)
skel->field = V4L2_FIELD_BOTTOM;
}
vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
}
#endif
@ -160,6 +168,17 @@ static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
{
struct skeleton *skel = vb2_get_drv_priv(vq);
skel->field = skel->format.field;
if (skel->field == V4L2_FIELD_ALTERNATE) {
/*
* You cannot use read() with FIELD_ALTERNATE since the field
* information (TOP/BOTTOM) cannot be passed back to the user.
*/
if (vb2_fileio_is_active(q))
return -EINVAL;
skel->field = V4L2_FIELD_TOP;
}
if (vq->num_buffers + *nbuffers < 3)
*nbuffers = 3 - vq->num_buffers;
@ -173,10 +192,7 @@ static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
/*
* Prepare the buffer for queueing to the DMA engine: check and set the
* payload size and fill in the field. Note: if the format's field is
* V4L2_FIELD_ALTERNATE, then vb->v4l2_buf.field should be set in the
* interrupt handler since that's usually where you know if the TOP or
* BOTTOM field has been captured.
* payload size.
*/
static int buffer_prepare(struct vb2_buffer *vb)
{
@ -190,7 +206,6 @@ static int buffer_prepare(struct vb2_buffer *vb)
}
vb2_set_plane_payload(vb, 0, size);
vb->v4l2_buf.field = skel->format.field;
return 0;
}
@ -319,10 +334,12 @@ static void skeleton_fill_pix_format(struct skeleton *skel,
/* HDMI input */
pix->width = skel->timings.bt.width;
pix->height = skel->timings.bt.height;
if (skel->timings.bt.interlaced)
pix->field = V4L2_FIELD_INTERLACED;
else
if (skel->timings.bt.interlaced) {
pix->field = V4L2_FIELD_ALTERNATE;
pix->height /= 2;
} else {
pix->field = V4L2_FIELD_NONE;
}
pix->colorspace = V4L2_COLORSPACE_REC709;
}