Re: [RFD] Automatic suspend

Brian Swetland
2009-02-17T14:14:34Z

[Matthew Garrett <mjg59@srcf.ucam.org>]
> On Tue, Feb 17, 2009 at 12:22:59AM +0100, Pavel Machek wrote:
> > On Mon 2009-02-16 23:13:24, Matthew Garrett wrote:
> > > Meanwhile, on embedded it's becoming a less interesting problem because
> > > idle and suspended are often now equivalent states.
> >
> > Android people tell us otherwise.
>
> https://lists.linux-foundation.org/pipermail/linux-pm/2009-January/019493.html
> says that they're the same on their current platform.

Well on the Qualcomm MSM72xx SoCs, yeah they're pretty similar -- we can
reasonably enter power collapse (full shutdown of the ARM11 and
peripherals) from idle. But this is not (to my knowledge) true of *all*
SoCs out there. Also, resuming from this state can take 5-30ms
(depending on how distracted the baseband processor is by what's going
on on the network).

Brian