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usb: gadget: uvc: mark incomplete frames with UVC_STREAM_ERR 

[ Upstream commit 2a3b7af120 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Michael Grzeschik 2024-02-14 00:37:55 +01:00 committed by Greg Kroah-Hartman
parent 4b1f991bad
commit 0d52e1853b
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;