On 6/12/2011 9:52 PM, He, Yong M wrote:
Hi Arjan ,
about the power state of camera subdevs,
the original idea is to power off all subdevs (camera sensors) when there's no
user application was opening this device.
(the libCI breaks down all its operations to many very small ones, each one will do
an open and close on the /dev/video0 file. so there're many power off&on for
even a single snapshot operation)
but since we updated the firmware for AF feature, each power on, we need to
re-load the firmware, it will break the focus status,,,
so I remove this power-off. and only do power off when the driver's suspend
method is called (for example, system goes to S0i3), not every time when it is
closed.
there is no suspend!
now if you have very frequent in/outs and you need to "debounce" them,
the runtime PM framework supports that where you can set up code to
delay this by, say, 100 msec.
I would suggest looking into that angle.
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