Hi Kevin,
On Friday 20 November 2009 19:29:02 Kevin Hilman wrote:
> Maxime Petazzoni <mpetazzoni@xxxxxxxxxx> writes:
> > Hi,
> >
> > * Premi, Sanjeev <premi@xxxxxx> [2009-11-20 21:17:04]:
> >> I am facing a strange problem on OMAP3EVM after resuming from idle.
> >> When using OPP5, the VDD1 voltage ramps to 1.35V.
> >>
> >> However, when i go thru the idle/wakeup cycle, the voltage never
> >> ramps back to 1.35V but stays at 1.20V.
> >
> > I'm seeing some interesting behavior with the OPP values here, too, with
> > suspend/resume. I'm using SRF based PM and CPUFREQ. Here's what happens:
> >
> > When changing the CPU frequency through the scaling_setfreq knob of
> > CPUFREQ, the vdd{1,2}_opp values are updated accordingly. After a
> > suspend/resume cycles, the OPPs return to their pre-suspend values, all
> > is fine.
> >
> > But when changing the OPP values by hand through the vdd{1,2}_opp knobs,
> > the CPU frequency is changed accordingly, which is expected. But after a
> > suspend/resume cycle, the OPP values return to the value CPUFREQ set
> > them to (which may be different than the default OPP values of 3).
> >
> > Is this the normal behavior? Is cpufreq authoritative on the OPP values
> > on resume? Or should it follow whatever value was manually set before
> > suspending?
>
> FWIW, the vdd*_opp sysfs hooks were for initial debug/dev and should
> be considered experimental (a.k.a broken.) They will disappear from
> the PM branch shortly.
>
> CPUfreq should be the only interface used for DVFS.
Could the PM page on elinux.org be updated with that info? I am proposing to
change it before you ask me ;p
>
> Kevin
Thanks,
Jean
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