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usb: gadget: uvc: mark incomplete frames with UVC_STREAM_ERR 

If an frame was transmitted incomplete to the host, we set the
UVC_STREAM_ERR bit in the header for the last request that is going
to be queued. This way the host will know that it should drop the
frame instead of trying to display the corrupted content.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20240214-uvc-error-tag-v1-2-37659a3877fe@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik 2024-02-14 00:37:55 +01:00 committed by Greg Kroah-Hartman
parent ab9ffa51d5
commit 2a3b7af120
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/gadget/function/uvc_video.c
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@ -35,6 +35,9 @@ uvc_video_encode_header(struct uvc_video *video, struct uvc_buffer *buf,
data[1] = UVC_STREAM_EOH | video->fid;
if (video->queue.flags & UVC_QUEUE_DROP_INCOMPLETE)
data[1] |= UVC_STREAM_ERR;
if (video->queue.buf_used == 0 && ts.tv_sec) {
/* dwClockFrequency is 48 MHz */
u32 pts = ((u64)ts.tv_sec * USEC_PER_SEC + ts.tv_nsec / NSEC_PER_USEC) * 48;