be suspended
Webcams with microphones are composite devices, and autosuspend is set
at the device level. If uvcvideo is probed after snd-usb-audio, the effect
of the quirk applied by snd-usb-audio is undone by uvcvideo's global
application of autosuspend.
Incrementing the interface's PM refcount in such cases prevents runtime PM
from happening, thus the device is left active.
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
b921462aad