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[media] uvcvideo: Support allocating buffers larger than the current frame size 

The queue_setup handler takes an optional format argument that can be
used to allocate buffers for a format different than the current format.
The uvcvideo driver doesn't support changing the format when buffers
have been allocated, but there's no reason not to support allocating
buffers larger than the minimum size.

When the format argument isn't NULL verify that the requested image size
is large enough for the current format and use it for the buffer size.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Laurent Pinchart 2014-02-18 10:40:47 -03:00 committed by Mauro Carvalho Chehab
parent ccc135c380
commit bddb9d0e97
1 changed files with 6 additions and 1 deletions
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7
drivers/media/usb/uvc/uvc_queue.c
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@ -48,9 +48,14 @@ static int uvc_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
struct uvc_streaming *stream =
container_of(queue, struct uvc_streaming, queue);
/* Make sure the image size is large enough. */
if (fmt && fmt->fmt.pix.sizeimage < stream->ctrl.dwMaxVideoFrameSize)
return -EINVAL;
*nplanes = 1;
sizes[0] = stream->ctrl.dwMaxVideoFrameSize;
sizes[0] = fmt ? fmt->fmt.pix.sizeimage
: stream->ctrl.dwMaxVideoFrameSize;
return 0;
}