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>

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 9755f4416e96..680e7da5e5e4 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)