On Thu, Feb 02, 2017 at 11:12:41AM -0800, Steve Longerbeam wrote:
> Here is the current .queue_setup() op in imx-media-capture.c:
>
> static int capture_queue_setup(struct vb2_queue *vq,
> unsigned int *nbuffers,
> unsigned int *nplanes,
> unsigned int sizes[],
> struct device *alloc_devs[])
> {
> struct capture_priv *priv = vb2_get_drv_priv(vq);
> struct v4l2_pix_format *pix = &priv->vdev.fmt.fmt.pix;
> unsigned int count = *nbuffers;
>
> if (vq->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> return -EINVAL;
>
> if (*nplanes) {
> if (*nplanes != 1 || sizes[0] < pix->sizeimage)
> return -EINVAL;
> count += vq->num_buffers;
> }
>
> while (pix->sizeimage * count > VID_MEM_LIMIT)
> count--;
That's a weird way of writing:
unsigned int max_num = VID_MEM_LIMIT / pix->sizeimage;
count = max(count, max_num);
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