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V4L/DVB (13907): cx18: Perform automatic rotation of very old, unread IDX buffers 

According to the v4l2 spec, very old MPEG index entries needs to be discarded
in favor of newer index entries.  This change ensures the firmware always has
buffers for index entries at the expense of the oldest unread buffers.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andy Walls 2009-12-31 18:27:13 -03:00 committed by Mauro Carvalho Chehab
parent 79f3e96018
commit ef99179710
3 changed files with 33 additions and 1 deletions
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5
drivers/media/video/cx18/cx18-mailbox.c
View File

@ -223,8 +223,11 @@ static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
CX18_DEBUG_HI_DMA("%s recv bytesused = %d\n",
s->name, mdl->bytesused);
if (s->type != CX18_ENC_STREAM_TYPE_TS)
if (s->type != CX18_ENC_STREAM_TYPE_TS) {
cx18_enqueue(s, mdl, &s->q_full);
if (s->type == CX18_ENC_STREAM_TYPE_IDX)
cx18_stream_rotate_idx_mdls(cx);
}
else {
cx18_mdl_send_to_dvb(s, mdl);
cx18_enqueue(s, mdl, &s->q_free);

26
drivers/media/video/cx18/cx18-streams.c
View File

@ -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)

3
drivers/media/video/cx18/cx18-streams.h
View File

@ -28,6 +28,9 @@ int cx18_streams_setup(struct cx18 *cx);
int cx18_streams_register(struct cx18 *cx);
void cx18_streams_cleanup(struct cx18 *cx, int unregister);
#define CX18_ENC_STREAM_TYPE_IDX_FW_MDL_MIN (3)
void cx18_stream_rotate_idx_mdls(struct cx18 *cx);
static inline bool cx18_stream_enabled(struct cx18_stream *s)
{
return s->video_dev || s->dvb.enabled ||