On Wed, Jan 21, 2015 at 10:55 AM, Scott Jiang
<scott.jiang.linux@xxxxxxxxx> wrote:
> 2014-12-20 18:47 GMT+08:00 Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>:
>> this patch adds support to vb2_ioctl_* helpers.
>>
>> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>
>> ---
>> drivers/media/platform/blackfin/bfin_capture.c | 107 +++++--------------------
>> 1 file changed, 22 insertions(+), 85 deletions(-)
>>
>> diff --git a/drivers/media/platform/blackfin/bfin_capture.c b/drivers/media/platform/blackfin/bfin_capture.c
>> index 30f1fe0..80a0efc 100644
>> --- a/drivers/media/platform/blackfin/bfin_capture.c
>> +++ b/drivers/media/platform/blackfin/bfin_capture.c
>> @@ -272,15 +272,28 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
>> struct ppi_if *ppi = bcap_dev->ppi;
>> struct bcap_buffer *buf, *tmp;
>> struct ppi_params params;
>> + dma_addr_t addr;
>> int ret;
>>
>> /* enable streamon on the sub device */
>> ret = v4l2_subdev_call(bcap_dev->sd, video, s_stream, 1);
>> if (ret && (ret != -ENOIOCTLCMD)) {
>> v4l2_err(&bcap_dev->v4l2_dev, "stream on failed in subdev\n");
>> + bcap_dev->cur_frm = NULL;
>> goto err;
>> }
>>
>> + /* get the next frame from the dma queue */
>> + bcap_dev->cur_frm = list_entry(bcap_dev->dma_queue.next,
>> + struct bcap_buffer, list);
>> + /* remove buffer from the dma queue */
>> + list_del_init(&bcap_dev->cur_frm->list);
>> + addr = vb2_dma_contig_plane_dma_addr(&bcap_dev->cur_frm->vb, 0);
>> + /* update DMA address */
>> + ppi->ops->update_addr(ppi, (unsigned long)addr);
>> + /* enable ppi */
>> + ppi->ops->start(ppi);
>> +
>
> Absolutely wrong here. You can't start ppi before you set ppi params.
> In fact vb2_streamon() is called before this in bcap_streamon().
Agreed need to move the ppi->ops->start(ppi); call after
ret = ppi->ops->set_params(ppi, ¶ms); that should fix it.
Thanks,
--Prabhakar Lad
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