[media] v4l2: use new flag to enable core priority handling

Rather than guess which driver supports core priority handling, require drivers
that do to explicitly set the V4L2_FL_USE_FH_PRIO flag in video_device.

Updated the core prio handling accordingly and set the flag in the three
drivers that do.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/media/video/ivtv/ivtv-streams.c b/drivers/media/video/ivtv/ivtv-streams.c
index 512607e0cda3..942683336555 100644
--- a/drivers/media/video/ivtv/ivtv-streams.c
+++ b/drivers/media/video/ivtv/ivtv-streams.c
@@ -214,6 +214,7 @@ static int ivtv_prep_dev(struct ivtv *itv, int type)
         s->vdev->fops = ivtv_stream_info[type].fops;
         s->vdev->release = video_device_release;
         s->vdev->tvnorms = V4L2_STD_ALL;
+        set_bit(V4L2_FL_USE_FH_PRIO, &s->vdev->flags);
         ivtv_set_funcs(s->vdev);
         return 0;
 }