From: Jun Chen <jun.chen@vatics.com>
Date: Wed, 25 Dec 2019 02:34:17 +0000 (+0100)
Subject: media: uvcvideo: Fix annotation for uvc_video_clock_update()
X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~1054^2~281
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=fc8678783c72cedd61e5de24978bcc6e147f4d77;p=linux.git

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>
---

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 6249e26e8788..a6a441d92b94 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -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.