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@xxxxxxxxxxxxxx> --- v4 -> v5: - using STREAMING_MIN_BUFFERS set the min nbuffers - renamed the patch since the function changed - removed the g_ctrl function - reordered this patch in the series v1 -> v4: - --- drivers/usb/gadget/function/uvc.h | 2 ++ drivers/usb/gadget/function/uvc_queue.c | 3 +++ 2 files changed, 5 insertions(+) diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h index bedb4ef42864f..6f44dd7323150 100644 --- a/drivers/usb/gadget/function/uvc.h +++ b/drivers/usb/gadget/function/uvc.h @@ -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 */ diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c index 6757a4e25a743..5eaeae3e2441c 100644 --- a/drivers/usb/gadget/function/uvc_queue.c +++ b/drivers/usb/gadget/function/uvc_queue.c @@ -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; -- 2.39.5
