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path: root/drivers/media/video/ivtv/ivtv-fileops.c
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Diffstat (limited to 'drivers/media/video/ivtv/ivtv-fileops.c')
-rw-r--r--drivers/media/video/ivtv/ivtv-fileops.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/media/video/ivtv/ivtv-fileops.c b/drivers/media/video/ivtv/ivtv-fileops.c
index 58ad0d9c680..6fb96f19a86 100644
--- a/drivers/media/video/ivtv/ivtv-fileops.c
+++ b/drivers/media/video/ivtv/ivtv-fileops.c
@@ -581,6 +581,24 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
retry:
+ /* If possible, just DMA the entire frame - Check the data transfer size
+ since we may get here before the stream has been fully set-up */
+ if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
+ while (count >= itv->dma_data_req_size) {
+ if (!ivtv_yuv_udma_stream_frame (itv, (void *)user_buf)) {
+ bytes_written += itv->dma_data_req_size;
+ user_buf += itv->dma_data_req_size;
+ count -= itv->dma_data_req_size;
+ } else {
+ break;
+ }
+ }
+ if (count == 0) {
+ IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
+ return bytes_written;
+ }
+ }
+
for (;;) {
/* Gather buffers */
while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
@@ -660,6 +678,9 @@ retry:
if (s->q_full.length >= itv->dma_data_req_size) {
int got_sig;
+ if (mode == OUT_YUV)
+ ivtv_yuv_setup_stream_frame(itv);
+
prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
while (!(got_sig = signal_pending(current)) &&
test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
@@ -946,7 +967,7 @@ static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
/* For yuv, we need to know the dma size before we start */
itv->dma_data_req_size =
- itv->params.width * itv->params.height * 3 / 2;
+ 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
itv->yuv_info.stream_size = 0;
}
return 0;