On 02/20/2015 05:38 PM, Kamil Debski wrote:
> The s5p-mfc driver interprets a buffer with bytesused equal to 0 as a
> special case indicating end-of-stream. After vb2: fix bytesused == 0
> handling (8a75ffb) patch videobuf2 modified the value of bytesused if it
> was 0. The allow_zero_bytesused flag was added to videobuf2 to keep
> backward compatibility.
>
> Signed-off-by: Kamil Debski <[email protected]>
> ---
> drivers/media/platform/s5p-mfc/s5p_mfc.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c
> b/drivers/media/platform/s5p-mfc/s5p_mfc.c
> index 8e44a59..6b08488 100644
> --- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
> +++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
> @@ -843,6 +843,13 @@ static int s5p_mfc_open(struct file *file)
> ret = -ENOENT;
> goto err_queue_init;
> }
> + /* One of means to indicate end-of-stream for MFC is to set the
> + * bytesused == 0. However by default videobuf2 handles videobuf
Same typos as in patch 3/4.
Regards,
Hans
> + * equal to 0 as a special case and changes its value to the size
> + * of the buffer. Set the allow_zero_bytesused flag so that videobuf2
> + * will keep the value of bytesused intact.
> + */
> + q->allow_zero_bytesused = 1;
> q->mem_ops = &vb2_dma_contig_memops;
> q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> ret = vb2_queue_init(q);
>
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