[linux-pm] [RFC][PATCH 00/11] Android PM extensions

[Rafael J. Wysocki]

On Sunday 01 February 2009, Arve Hjønnevåg wrote:
> On Sat, Jan 31, 2009 at 4:18 PM, Rafael J. Wysocki <rjw at sisk.pl> wrote:
> > If the user forcibly puts the device into suspend, it's very much like powering
> > off.  The kernel shouldn't prevent that from happening unless in error
> > conditions.
> 
> No, when the phone is powered off, it is not expected to ring. When it
> is suspended it is expected to ring.
> 
> > If incoming calls are supposed to wake up the system, then there are two
> > possibilities:
> > - the already started suspend sequence may be aborted and the system may be put
> >  into the low power state,
> 
> I assume you mean high power state not low power state, or does low
> power state mean early-suspend state. If so, locking a wakelock will
> accomplish this.

Actually, I meant the working state.  Aborting suspend sequence always means
go back to the working state.

Also, I think the device that detected the incoming call should abort the
suspend sequence by refusing to suspend.

> > - the system may be suspended and then immediately woken up.
> 
> If you mean this as a general strategy, and not a specific outcome,
> then it does not always work (for the reasons I have already stated).

I meant a specific outcome.

It may be impossible to abort suspend if the call comes in sufficiently
late.

Thanks,
Rafael