Re: Runtime PM discussion notes

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On Tue, Jun 28, 2011 at 01:47:47PM -0600, Paul Walmsley wrote:
> On Fri, 24 Jun 2011, Arve Hj?nnev?g wrote:
> > On Fri, Jun 24, 2011 at 12:53 PM, Paul Walmsley <paul@xxxxxxxxx> wrote:

> > > "On the hardware that shipped we enter the same power state from idle
> > > and suspend, so the only power savings we get from suspend that we
> > > don't get in idle is from not respecting the scheduler and timers."

> > This is no longer the case. Both the Nexus-S and Xoom enter lower
> > power states from suspend than idle.

> Just out of curiosity, is that due to some kind of hardware limitation on 
> those platforms, or is it because the software infrastructure for dynamic 
> deep idle hasn't been fully implemented in that subarchitecture code?

At least the Nexus S doesn't implmeent any of the deep idle
infrastructure.  However, I'd expect that you can achieve some power
saving from entering system suspend as if *everything* is off then the
PMIC can be suspended which can enable additional power savings.  Unless
I'm missing something that'd be hard to hit with cpuidle only stuff.
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