@@ -44,7 +44,8 @@ static int uvc_queue_setup(struct vb2_queue *vq,
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_video *video = container_of(queue, struct uvc_video, queue);
- struct usb_composite_dev *cdev = video->uvc->func.config->cdev;
+ unsigned int req_size;
+ unsigned int nreq;
if (*nbuffers > UVC_MAX_VIDEO_BUFFERS)
*nbuffers = UVC_MAX_VIDEO_BUFFERS;
@@ -53,10 +54,16 @@ static int uvc_queue_setup(struct vb2_queue *vq,
sizes[0] = video->imagesize;
- if (cdev->gadget->speed < USB_SPEED_SUPER)
- video->uvc_num_requests = 4;
- else
- video->uvc_num_requests = 64;
+ req_size = video->ep->maxpacket
+ * max_t(unsigned int, video->ep->maxburst, 1)
+ * (video->ep->mult);
+
+ /* We divide by two, to increase the chance to run
+ * into fewer requests for smaller framesizes.
+ */
+ nreq = DIV_ROUND_UP(DIV_ROUND_UP(sizes[0], 2), req_size);
+ nreq = clamp(nreq, 4U, 64U);
+ video->uvc_num_requests = nreq;
return 0;
}
The current limitation of possible number of requests being handled is dependent on the gadget speed. It makes more sense to depend on the typical frame size when calculating the number of requests. This patch is changing this and is using the previous limits as boundaries for reasonable minimum and maximum number of requests. For a 1080p jpeg encoded video stream with a maximum imagesize of e.g. 800kB with a maxburst of 8 and an multiplier of 1 the resulting number of requests is calculated to 49. 800768 1 nreqs = ------ * -------------- ~= 49 2 (1024 * 8 * 1) Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> --- v1 -> v2: - using clamp instead of min/max - added calculation example to description - commented the additional division by two in the code drivers/usb/gadget/function/uvc_queue.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)