Re: community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?]

Scott E. Preece
2006-09-15T03:05:06Z

| From: "Vitaly Wool"<vitalywool@gmail.com>
|
| Pavel,
|
| On 9/14/06, Pavel Machek <pavel@ucw.cz> wrote:
| >
| > > Pavel,
| >
| > > > > operating points it is possible to implement the "cpufreq frequency
| > > > > selection logic" in user space and having such functionality in the kernel
| > > > > just violates the main rule of having everything possible outside of the
| > > > > kernel.
| > > >
| > > > You got the rules wrong. "Keep the code out of kernel" is important
| > > > rule, but probably not the main one.
| > >
| > > from aside, it looks like you're choosing 'rules' and assign then
| > > 'priorities' in a too arbitrary way which is by a strange accident
| > > fits your point of view best of all.
| > > May I remind you that Linux world is not only laptops and Sharp Zaurus? ;)
| >
| > Actually, laptops and zauruses seem to be the only "interesting"
| > machines from pm perspective. Then there are Motorola cellphones, but
| > Motorola tried hard not to enable users changing kernel... so they are
| > irrelevant.
|
| Well, I never said Zaurus was no good :)
| Please don't forget about Nokia 770 and its possible follow-ups.
| Also, please keep in mind that if we come to a joint PM solution that
| is in mainline, Motorola will use it... and will be contributing
| changes back to the community. If there was a PM solution adopted in
| mainline which fit the needs of embedded devices, more vendors would
| turn to using Linux.
| I. e., what prevents Sharp from making a open-code Lnux-based cell
| phone? I do think that the absense of PM framework suitable for
| embedded is one of the main engineering reasons... So let us broaden
| our views and work together :)
|
| Vitaly
---

Source for the power management in current Motorola products is
available on opensource.motorola.com. However, mainstream power
management did not meet our needs, so what's there is a replacement,
rather than modifications. Because it's product-specific, it's not
particularly generalized and probably wouldn't be suitable for use
in a laptop...

scott

--
scott preece
motorola mobile devices, il67, 1800 s. oak st., champaign, il 61820
e-mail: preece@motorola.com fax: +1-217-384-8550
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