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

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>

diff --git a/Documentation/video4linux/v4l2-pci-skeleton.c b/Documentation/video4linux/v4l2-pci-skeleton.c
index 3a1c0d2dafce5ea4a6ff829f61cc40c863be40ce..80251dc2c6cf85662f98763648a42fd802160eff 100644 (file)
--- a/Documentation/video4linux/v4l2-pci-skeleton.c
+++ b/Documentation/video4linux/v4l2-pci-skeleton.c
@@ -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;
        }