Am Mittwoch, 26. Dezember 2007 21:32:58 schrieb Pavel Machek:
> ... I also don't need to call any suspend() routines, because all the
> drivers are already suspended, right?
Well, you have a number of devices which cannot do runtime pm.
They can do suspend/resume with the whole system. For them these
operations mean saving/restoring state.
So for these devices implementing autosuspend makes no sense.
They would sensibly do only idle/busy detection.
> And yes, I want device activity to prevent s2ram. If user is burning
> CD, machine should not sleep. If user is actively typing, machine
In these cases the devices involved should report themselves busy,
shouldn't they?
> should not sleep. My vision is: screen saver tells kernel keyboard
> need not be very responsive, at that point keyboard driver can
> autosuspend the keyboard, and if that was the last device, whole
> system sleeps.
We lack a notion of telling devices that they are opened only for
detecting wakeups. Currently a driver has to assume that an opened
device has to be fully functional.
Regards
Oliver
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