linux-kernel - Re: [PATCH v5 0/5] media: uvcvideo: Implement Granular Power Saving

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <cf81d1e8-3378-463f-948b-6c894e73a1b0@redhat.com>
Date: Mon, 10 Mar 2025 16:24:01 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Guennadi Liakhovetski <guennadi.liakhovetski@...el.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: Re: [PATCH v5 0/5] media: uvcvideo: Implement Granular Power Saving

Hi Ricardo,

On 3-Mar-25 20:13, Ricardo Ribalda wrote:
> Right now we power-up the device when a user open() the device and we
> power it off when the last user close() the first video node.
> 
> This behaviour affects the power consumption of the device is multiple
> use cases, such as:
> - Polling the privacy gpio
> - udev probing the device
> 
> This patchset introduces a more granular power saving behaviour where
> the camera is only awaken when needed. It is compatible with
> asynchronous controls.
> 
> While developing this patchset, two bugs were found. The patchset has
> been developed so these fixes can be taken independently.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
> Changes in v5:
> - Improve "media: uvcvideo: Make power management granular" commit
>   message.
> - Link to v4: https://lore.kernel.org/r/20250226-uvc-granpower-ng-v4-0-3ec9be906048@chromium.org

Thank you for the new version.

I've merge the entire series into:
https://gitlab.freedesktop.org/linux-media/users/uvc/ -next now.

Regards,

Hans





> Changes in v4:
> - CodeStyle
> - Create uvc_pm_ functions
> - Link to v3: https://lore.kernel.org/r/20250206-uvc-granpower-ng-v3-0-32d0d7b0c5d8@chromium.org
> 
> Changes in v3:
> - Fix build error on sh4.
> - Link to v2: https://lore.kernel.org/r/20250203-uvc-granpower-ng-v2-0-bef4b55e7b67@chromium.org
> 
> Changes in v2:
> - Add missing semicolon.
> - Rebase on top of media-committers/next
> - Link to v1: https://lore.kernel.org/r/20241126-uvc-granpower-ng-v1-0-6312bf26549c@chromium.org
> 
> ---
> Ricardo Ribalda (5):
>       media: uvcvideo: Keep streaming state in the file handle
>       media: uvcvideo: Create uvc_pm_(get|put) functions
>       media: uvcvideo: Increase/decrease the PM counter per IOCTL
>       media: uvcvideo: Make power management granular
>       media: uvcvideo: Do not turn on the camera for some ioctls
> 
>  drivers/media/usb/uvc/uvc_ctrl.c | 13 +++++-
>  drivers/media/usb/uvc/uvc_v4l2.c | 99 ++++++++++++++++++++++++++++++----------
>  drivers/media/usb/uvc/uvcvideo.h |  6 +++
>  3 files changed, 92 insertions(+), 26 deletions(-)
> ---
> base-commit: d98e9213a768a3cc3a99f5e1abe09ad3baff2104
> change-id: 20241126-uvc-granpower-ng-069185a6d474
> 
> Best regards,