Commit fc867878 authored by Jun Chen's avatar Jun Chen Committed by Mauro Carvalho Chehab
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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: default avatarJun Chen <jun.chen@vatics.com>
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent a73a342a

drivers/media/usb/uvc/uvc_video.c

+1 −1
Original line number Diff line number Diff line
@@ -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.