mbox series

[RESEND,v5,0/5] uvcvideo: Fixes for hw timestamping

Message ID 20220920-resend-hwtimestamp-v5-0-139d1a144614@chromium.org
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Series uvcvideo: Fixes for hw timestamping | expand

Message

Ricardo Ribalda March 8, 2023, 10:45 p.m. UTC 
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 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 (5):
      media: uvc: 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  | 123 ++++++++++++++++++++++++-------------
 drivers/media/usb/uvc/uvcvideo.h   |   2 +
 3 files changed, 91 insertions(+), 43 deletions(-)
---
base-commit: 73d6709376914f577a61bb29e596fa93ec66598c
change-id: 20220920-resend-hwtimestamp-b3e22729284d

Best regards,

Comments

Sergey Senozhatsky March 9, 2023, 5:26 a.m. UTC | #1 
On (23/03/08 23:45), Ricardo Ribalda wrote:
> 
> Isolate all the changes related to the clock circular buffer to its own
> function, that way we can make changes easier to the buffer logic.
> 
> Also simplify the lock, by removing the circular buffer clock handling
> from uvc_video_clock_decode().
> 
> And now that we are at it, unify the API of the clock functions.
> 
> Tested-by: HungNien Chen <hn.chen@sunplusit.com>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>

Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Sergey Senozhatsky March 9, 2023, 5:38 a.m. UTC | #2 
On (23/03/08 23:45), Ricardo Ribalda wrote:
[..]
> +	/*
> +	 * Some devices make a borderline interpretation of the UVC 1.5 standard
> +	 * and sends packets with no data contain undefined timestamps.

A nit: can this be reworded? I'm having some issues with interpretation.