media: uvcvideo: Increase/decrease the PM counter per IOCTL

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Now we call uvc_pm_get/put from the device open/close. This low
level of granularity might leave the camera powered on in situations
where it is not needed.

Increase the granularity by increasing and decreasing the Power
Management counter per ioctl. There are two special cases where the
power management outlives the ioctl: async controls and streamon. Handle
those cases as well.

In a future patch, we will remove the uvc_pm_get/put from open/close.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Message-ID: <20250327-uvc-granpower-ng-v6-3-35a2357ff348@chromium.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

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Ricardo Ribalda 2025-03-27 21:05:29 +00:00 • committed by Hans Verkuil

parent 2f101572c0

commit 10acb91013

2 changed files with 64 additions and 13 deletions

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38

drivers/media/usb/uvc/uvc_ctrl.c

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39

drivers/media/usb/uvc/uvc_v4l2.c

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