V4L/DVB (9801): cx18: Allow more than 63 capture buffers in rotation per stream

cx18: Allow more than 63 capture buffers in rotation per stream.  Implement
q_busy to hold buffers the firmware has for use.  q_free holds truly unused
buffers in a pool.  New buffers are given to the firmware as soon as the
firmware returns one, if there are any to give to the firmware.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 10 deletions

diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c
index 504a1f9edec6..61192e62a80f 100644
--- a/drivers/media/video/cx18/cx18-fileops.c
+++ b/drivers/media/video/cx18/cx18-fileops.c
@@ -187,7 +187,7 @@ static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block,
                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
                                         /* byteswap and process VBI data */
 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
-                                        cx18_enqueue(s_vbi, buf, &s_vbi->q_free);
+                                        cx18_stream_put_buf_fw(s_vbi, buf);
                                 }
                         }
                         buf = &cx->vbi.sliced_mpeg_buf;
@@ -361,15 +361,9 @@ static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
                                 tot_count - tot_written);
 
                 if (buf != &cx->vbi.sliced_mpeg_buf) {
-                        if (buf->readpos == buf->bytesused) {
-                                cx18_buf_sync_for_device(s, buf);
-                                cx18_enqueue(s, buf, &s->q_free);
-                                cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
-                                        s->handle,
-                                        (void __iomem *)&cx->scb->cpu_mdl[buf->id] -
-                                          cx->enc_mem,
-                                        1, buf->id, s->buf_size);
-                        } else
+                        if (buf->readpos == buf->bytesused)
+                                cx18_stream_put_buf_fw(s, buf);
+                        else
                                 cx18_push(s, buf, &s->q_full);
                 } else if (buf->readpos == buf->bytesused) {
                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;