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media: uvcvideo: Fix annotation for uvc_video_clock_update() 

The formula (2) is to convert from SOF to host clock,
it should be fix as
"TS = ((TS2 - TS1) * SOF + TS1 * SOF2 - TS2 * SOF1) / (SOF2 - SOF1)"

Signed-off-by: Jun Chen <jun.chen@vatics.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Jun Chen 2019-12-25 03:34:17 +01:00 committed by Mauro Carvalho Chehab
parent a73a342a6b
commit fc8678783c
1 changed files with 1 additions and 1 deletions
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2
drivers/media/usb/uvc/uvc_video.c
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@ -622,7 +622,7 @@ static u16 uvc_video_clock_host_sof(const struct uvc_clock_sample *sample)
* to avoid losing precision in the division. Similarly, the host timestamp is
* computed with
*
* TS = ((TS2 - TS1) * PTS + TS1 * SOF2 - TS2 * SOF1) / (SOF2 - SOF1) (2)
* TS = ((TS2 - TS1) * SOF + TS1 * SOF2 - TS2 * SOF1) / (SOF2 - SOF1) (2)
*
* SOF values are coded on 11 bits by USB. We extend their precision with 16
* decimal bits, leading to a 11.16 coding.