[PATCH v9 0/6] uvcvideo: Fixes for hw timestamping

[Ricardo Ribalda <ribalda@chromium.org>]

Add some fixes for fixing hw timestamp on some Logitech and SunplusIT
cameras. The issues have been previously reported to the manufacturers.

Also include a patch to fix the current hw timestamping logic for ANY
uvc 1.5 model running at under 16 fps.

@HungNien, the logic for empty_ts has slightly changed since v4, would
be great if you could test it on your end.

To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-media@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: hn.chen <hn.chen@sunplusit.com>
Tested-by: HungNien Chen <hn.chen@sunplusit.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>

---
Changes in v9:
- Fix bug on add_sample(). Sorry about that, click on send too fast :S
- Link to v8: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v8-0-0edaca2e2ab3@chromium.org

Changes in v8: Thanks Sergey!
- Move last_sof save into uvc_video_clock_add_sample().
- Improve comments on add_sample().
- Link to v7: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v7-0-cf1d78bb8821@chromium.org

Changes in v7: Thanks Sergey!
- Fix all negative modulus, including old bug
- Improve doc for 1/4 second accuracy.
- Link to v6: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v6-0-c7a99299ec35@chromium.org

Changes in v6 (Thanks Sergey!):
- Rebase on top of linus/master
- Add missing host_sof assignment, ups :(. Sorry about that!
- Improve comments for empty TS quirk
- Link to v5: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v5-0-660679c6e148@chromium.org

Changes in v5: Thanks Dan
- Check for !buf on empty TS packets.
- Link to v4: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v4-0-a8ddc1358a29@chromium.org

Changes in v4 (Thanks Laurent!):
- Rebase on top of pinchart/next/uvc
- Use heuristic for UVC_QUIRK_IGNORE_EMPTY_TS
- Link to v3: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v3-0-db9faee7f47d@chromium.org

Changes in v3 (Thanks Laurent!):
- Rebase on top of pinchart/uvc/next
- Fix hw timestampt handling for slow FPS
  - Improve commit message
- Quirk for invalid dev_sof in Logi C922
  - Improve commit message
- Allow hw clock updates with buffers not full
  - Fix typo and improve messages
- Refactor clock circular buffer
  - Improve commit message
- Quirk for autosuspend in Logi C910
  - Improve commit message
  - Add comments around the quirk
- Create UVC_QUIRK_IGNORE_EMPTY_TS quirk
  - Improve comments
- Allow quirking by entity guid
   - unsinged int
- Extend documentation of uvc_video_clock_decode()
   - uvcvideo on commit message
   - Improve comment
- Link to v2: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v2-0-d8d0616bb612@chromium.org

Changes in v2:
- Require 1/4 sec of data before using the hw timestamps
- Add Tested-by SunplusIT
- Link to v1: https://lore.kernel.org/r/20220920-resend-hwtimestamp-v1-0-e9c14b258404@chromium.org

---
Ricardo Ribalda (6):
      media: uvcvideo: Fix negative modulus calculation
      media: uvcvideo: Ignore empty TS packets
      media: uvcvideo: Quirk for invalid dev_sof in Logitech C922
      media: uvcvideo: Allow hw clock updates with buffers not full
      media: uvcvideo: Refactor clock circular buffer
      media: uvcvideo: Fix hw timestamp handling for slow FPS

 drivers/media/usb/uvc/uvc_driver.c |   9 +++
 drivers/media/usb/uvc/uvc_video.c  | 141 +++++++++++++++++++++++++------------
 drivers/media/usb/uvc/uvcvideo.h   |   2 +
 3 files changed, 108 insertions(+), 44 deletions(-)
---
base-commit: 63355b9884b3d1677de6bd1517cd2b8a9bf53978
change-id: 20220920-resend-hwtimestamp-b3e22729284d

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>