Hi Niklas,
Thank you for the patch.
On Tuesday 14 Mar 2017 19:59:52 Niklas Söderlund wrote:
> Instead of selecting single or continuous capture mode based on how many
> buffers userspace intends to give us select capture mode based on number
> of free buffers we can allocate to hardware when the stream is started.
>
> This change is a prerequisite to enable the driver to switch from
> continuous to single capture mode (or the other way around) when the
> driver is stalled by userspace not feeding it buffers as fast as it
> consumes it.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> ---
> drivers/media/platform/rcar-vin/rcar-dma.c | 31 ++++++++++++---------------
> 1 file changed, 15 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c
> b/drivers/media/platform/rcar-vin/rcar-dma.c index
> c10d75aa7e71d665..f7776592b9a13d41 100644
> --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> @@ -404,7 +404,21 @@ static void rvin_capture_off(struct rvin_dev *vin)
>
> static int rvin_capture_start(struct rvin_dev *vin)
> {
> - int ret;
> + struct rvin_buffer *buf, *node;
> + int bufs, ret;
> +
> + /* Count number of free buffers */
> + bufs = 0;
> + list_for_each_entry_safe(buf, node, &vin->buf_list, list)
> + bufs++;
> +
> + /* Continuous capture requires more buffers then there are HW slots */
> + vin->continuous = bufs > HW_BUFFER_NUM;
> +
> + if (!rvin_fill_hw(vin)) {
> + vin_err(vin, "HW not ready to start, not enough buffers
available\n");
> + return -EINVAL;
> + }
>
> rvin_crop_scale_comp(vin);
>
> @@ -1061,22 +1075,7 @@ static int rvin_start_streaming(struct vb2_queue *vq,
> unsigned int count) vin->state = RUNNING;
> vin->sequence = 0;
>
> - /* Continuous capture requires more buffers then there are HW slots */
> - vin->continuous = count > HW_BUFFER_NUM;
> -
> - /*
> - * This should never happen but if we don't have enough
> - * buffers for HW bail out
> - */
> - if (!rvin_fill_hw(vin)) {
> - vin_err(vin, "HW not ready to start, not enough buffers
available\n");
> - ret = -EINVAL;
> - goto out;
> - }
> -
> ret = rvin_capture_start(vin);
> -out:
> - /* Return all buffers if something went wrong */
> if (ret) {
> return_all_buffers(vin, VB2_BUF_STATE_QUEUED);
> v4l2_subdev_call(sd, video, s_stream, 0);
--
Regards,
Laurent Pinchart
