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authorHans de Goede <hdegoede@redhat.com>2024-08-30 13:12:07 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2024-08-30 15:17:27 +0300
commit7a36d05795fddf66f3ddaec710a8cace5af5623a (patch)
tree195708fce5bd80ccbab7819aa5d0e0d917f7cbfa /src/apps/qcam/assets/feathericons/droplet.svg
parent11e396bf9faf708bedc785a3ac5a4d3cc69f4c75 (diff)
pipeline: uvcvideo: Implement acquireDevice() + releaseDevice()
The uvcvideo pipeline handler always keeps the uvcvideo /dev/video# node for a pipeline open after enumerating the camera. This is a problem for uvcvideo, as keeping the /dev/video# node open stops the underlying USB device and the USB bus controller from being able to enter runtime-suspend causing significant unnecessary power-usage. Implement acquireDevice() + releaseDevice(), openening /dev/video# on acquire and closing it on release to fix this. And make validate do a local video_->open() + close() around validate() when not open yet, to keep validate() working on unacquired cameras. Bug: https://bugs.libcamera.org/show_bug.cgi?id=168 Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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