diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-streams.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-streams.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c index 9755f4416e9..680e7da5e5e 100644 --- a/drivers/media/video/cx18/cx18-streams.c +++ b/drivers/media/video/cx18/cx18-streams.c @@ -463,6 +463,32 @@ static void cx18_vbi_setup(struct cx18_stream *s) cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data); } +void cx18_stream_rotate_idx_mdls(struct cx18 *cx) +{ + struct cx18_stream *s = &cx->streams[CX18_ENC_STREAM_TYPE_IDX]; + struct cx18_mdl *mdl; + + if (!cx18_stream_enabled(s)) + return; + + /* Return if the firmware is not running low on MDLs */ + if ((atomic_read(&s->q_free.depth) + atomic_read(&s->q_busy.depth)) >= + CX18_ENC_STREAM_TYPE_IDX_FW_MDL_MIN) + return; + + /* Return if there are no MDLs to rotate back to the firmware */ + if (atomic_read(&s->q_full.depth) < 2) + return; + + /* + * Take the oldest IDX MDL still holding data, and discard its index + * entries by scheduling the MDL to go back to the firmware + */ + mdl = cx18_dequeue(s, &s->q_full); + if (mdl != NULL) + cx18_enqueue(s, mdl, &s->q_free); +} + static struct cx18_queue *_cx18_stream_put_mdl_fw(struct cx18_stream *s, struct cx18_mdl *mdl) |