From: Ricardo Ribalda Date: Wed, 4 Jan 2023 10:45:19 +0000 (+0100) Subject: media: uvcvideo: Extend documentation of uvc_video_clock_decode() X-Git-Tag: v6.6.17~5419^2~51^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=70fcaf92a39e6cb7542de0fc0ad4562f42f7f54a;p=platform%2Fkernel%2Flinux-rpi.git media: uvcvideo: Extend documentation of uvc_video_clock_decode() 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 Tested-by: HungNien Chen Signed-off-by: Ricardo Ribalda Signed-off-by: Laurent Pinchart --- diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index e4b71df..b1f7416 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -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)