Re: nokia 770 [was Re: community PM requirements/issues and PowerOP]

Pavel Machek
2006-12-13T21:03:59Z

On Wed 2006-12-13 15:12:07, Eugeny S. Mints wrote:
> David Brownell wrote:
> > On Tuesday 19 September 2006 11:25 am, Pavel Machek wrote:
> >> Could you perhaps provide list of operating points for 770? It would
> >> help understanding a bit, I'd say.
> >
> > If there was a followup here, I missed it ...
> >
> > ISTR that it doesn't use (formal) operating points, and that a lot of the
> > basic SOC power savings (vs powering off the display or wifi) come from a
> > different kind of mechanism entirely. Namely, a combination of dynamic
> > tick with a modified system idle task, which enters one of the OMAP low
> > power modes during those long periods between clock ticks or other irqs.
> >
> > That's one of the standard power saving schemes used on OMAP1 platforms
> > with Linux.

> sample of reasonable operating points for OMAP1 platforms along with appropriate
> patches may be found at http://dynamicpower.sourceforge.net/dpm-omap.html

Okay... so you have system with 4 different cpu speeds. That should be
simple enough to get running using cpufreq, no need for complex
operating points patches.
Pavel
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