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media: uvcvideo: Extend documentation of uvc_video_clock_decode()

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Make an explicit reference to UVC 1.5, explaining how the algorithm
supports the different behaviour of UVC 1.1 and 1.5.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: HungNien Chen <hn.chen@sunplusit.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Ricardo Ribalda 2023-01-04 11:45:19 +01:00 committed by Laurent Pinchart
parent 5dd0eab84a
commit 70fcaf92a3
1 changed files with 3 additions and 1 deletions
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4
drivers/media/usb/uvc/uvc_video.c
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@ -518,7 +518,9 @@ uvc_video_clock_decode(struct uvc_streaming *stream, struct uvc_buffer *buf,
/*
* To limit the amount of data, drop SCRs with an SOF identical to the
* previous one.
* previous one. This filtering is also needed to support UVC 1.5, where
* all the data packets of the same frame contains the same SOF. In that
* case only the first one will match the host_sof.
*/
dev_sof = get_unaligned_le16(&data[header_size - 2]);
if (dev_sof == stream->clock.last_sof)