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usb: gadget: uvc: set nbuffers to minimum STREAMING_MIN_BUFFERS in uvc_queue_setup

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We set the minimum amount of v4l2 buffers that is possibly be pending
to UVCG_STREAMING_MIN_BUFFERS which is two. This way the driver will
always have at least one frame pending to be encoded while the other
is being enqueued in the hardware.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20240403-uvc_request_length_by_interval-v7-7-e224bb1035f0@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik 2024-10-16 15:58:12 +02:00 committed by Greg Kroah-Hartman
parent 98ad032915
commit 1dc2527ce8
2 changed files with 5 additions and 0 deletions
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2
drivers/usb/gadget/function/uvc.h
View File

@ -74,6 +74,8 @@ extern unsigned int uvc_gadget_trace_param;
#define UVCG_REQ_MAX_INT_COUNT 16
#define UVCG_REQ_MAX_ZERO_COUNT (2 * UVCG_REQ_MAX_INT_COUNT)
#define UVCG_STREAMING_MIN_BUFFERS 2
/* ------------------------------------------------------------------------
* Structures
*/

3
drivers/usb/gadget/function/uvc_queue.c
View File

@ -21,6 +21,7 @@
#include <media/videobuf2-vmalloc.h>
#include "uvc.h"
#include "uvc_video.h"
/* ------------------------------------------------------------------------
* Video buffers queue management.
@ -47,6 +48,8 @@ static int uvc_queue_setup(struct vb2_queue *vq,
if (*nbuffers > UVC_MAX_VIDEO_BUFFERS)
*nbuffers = UVC_MAX_VIDEO_BUFFERS;
if (*nbuffers < UVCG_STREAMING_MIN_BUFFERS)
*nbuffers = UVCG_STREAMING_MIN_BUFFERS;
*nplanes = 1;