Re: [PATCH] cpufreq: add atom family to p4-clockmod

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On Monday 09 March 2009 12:16:04 Thomas Renninger wrote:
> Hi,
> 
> On Friday 06 March 2009 21:22:45 Jarod Wilson wrote:
> > Some atom procs don't do freq scaling (such as the atom 330 on my own
> > littlefalls2 board). By adding the atom family here, we at least get
> > the benefit of passive cooling in a thermal emergency.
> > Not sure how to see that its actually helping any,
> > but the driver does bind and
> > claim its functioning on my atom 330.
> I do not think this is a good idea.
> 
> There was a patch posted for a eeepc specific cpufreq enhancement
> making use of some "not official" ACPI methods.
> 
> Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver
> 
> There existed two version, one of Tom Hughes integrating the cpufreq
> parts into the already existing eeepc driver and one of Cristiano 
> Prisciandaro providing a separate eeepc cpufreq driver.
> 
> Now we have three unsynchronized instances doing clock modulation:
>   - as specified by ACPI spec
>   - through unspecified ACPI functions (e.g. on eeepc, fortunately
>     only on a specific set of machines)
>   - natively via p4_clockmod
> 
> The eeepc driver has not been pushed yet, as far as I can tell, but
> Matthew and Pavel already went through the code and did not object.
> 
> I wonder what happens if you load the p4_clockmod and eeepc driver
> both doing more or less the same.

So far as I know, all the netbook atom procs are to date, of the n2?0
variant, which are handled by acpi-cpufreq just fine. At least here in
Fedora land, if acpi-cpufreq is bound, we don't try p4-clockmod, so this
is only relevant for the desktop-targeted atoms at the moment, and
they're definitely found in !eeepc machines, so if anything, this sounds
like a better approach that relying on the eeepc-specific drivers for
throttling on non-acpi-cpufreq atom procs. Aren't these eeepc-specific
drivers for the non-atom eeepc's anyway?

-- 
Jarod Wilson
jarod@xxxxxxxxxx
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