Re: Alternative Concept [Was: Re: [RFC] CPUFreq PowerOP integration, Intro 0/3]

Mark Gross
2006-10-16T21:44:54Z

On Fri, Oct 13, 2006 at 12:55:04PM +0200, Pavel Machek wrote:
> Hi!
>
> > That's it. Bottom line is: what you are talking about is NOT an Alternative
> > Concept but a particular case instead. While PowerOP design is
> > generic case.
>
> Fine then; submit powerOP with interface Dominik suggested. Notice
> that his solution exposes all the knobs to userspace directly, so his
> interface _is_ different to yours. "i_am_special" is just one of knobs.

I am very keen on Dominic's design concept, however; I missed his sysfs
interface that exposes the knobs to userspace.

I've search the archives and still don't see any interface to user space
users.

--mgross
>
> > The last remark about 256 CPU case. Leveraging POwerOP such systems will be
> > built using just one (current) operating point approach as described
> > above.
>
> Notice that Dominik's solution still allows to have more than one
> operating point for each of 256 CPUs without explosion of number of
> states.
>
> Pavel
>
> > > F) So, how would this work for OMAP1?
> > >
> > > Let's limit it, to keep it somewhat simple, to the values contained in your
> > > "struct pm_core_point" for OMAP:
> > >
> > > int cpu_vltg; /* voltage in mV */
> > > int dpll; /* in KHz */
> > > int cpu; /* CPU frequency in KHz */
> > > int tc; /* in KHz */
> > > int per; /* in KHz */
> > > int dsp; /* in KHz */
> > > int dspmmu; /* in KHz */
> > > int lcd; /* in KHz */
> > >
> > > and let's also add a
> > >
> > > int i_am_special;
> > >
> > > Let's assume that there is an OMAP1 PM module which implements a ->set and
> > > ->get function for all of them. A yet-to-be-defined interface then tells
> > > this PM module
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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