linux-kernel - Re: [linux-pm] OpPoint summary

Open Source and information security mailing list archives

Date:	Mon, 18 Sep 2006 09:13:22 -0700
From:	Matthew Locke <matt@...adgs.com>
To:	"Richard A. Griffiths" <richard.griffiths@...driver.com>
Cc:	Pavel Machek <pavel@....cz>, linux-pm@...ts.osdl.org,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] OpPoint summary

On Sep 18, 2006, at 7:33 AM, Richard A. Griffiths wrote:

> On Sun, 2006-09-17 at 19:48 +0200, Pavel Machek wrote:
>> Hi!
>>
>>>> Care to resend your patches in the proper format, through email so 
>>>> that
>>>> we can see them, and possibly get some testing in -mm if they look 
>>>> sane?
>>>
>>> Greg,
>>>   here's the patch that implements operating points for different
>>>   frequencies
>>> for the speedstep-centrino line of processors.  Operating points are 
>>> created
>>> in much the same manner that cpufreq tables are.  This works for both
>>> simple implementations like the centrino and more complex SoC systems
>>> like the arm-pxa72x which has several clocks to control, and 
>>> different clock
>>> divisors and multipliers.
>>
>>> +static struct oppoint lowest = {
>>> +       .name = "lowest",
>>> +       .type = PM_FREQ_CHANGE,
>>> +       .frequency = 0,
>>> +       .voltage = 0,
>>> +       .latency = 15,
>>> +       .prepare_transition  = cpufreq_prepare_transition,
>>> +       .transition = centrino_transition,
>>> +       .finish_transition = cpufreq_finish_transition,
>>> +};
>>
>> We had nice, descriptive interface... with numbers. Now you want to
>> introduce english state names... looks like a step back to me.
>
> Maybe a compromise could be reached where a defined set of numbers maps
> to  string names ala Unix init states. Many people (at least me) still
> invoke init 6 to reboot a system.  A defined table would satisfy both
> the number and string camps.

PowerOP allows the platform to define the name. In our cpufreq 
integration patches, we reuse the same name that cpufreq centrino used.

>
> Richard
> _______________________________________________
> linux-pm mailing list
> linux-pm@...ts.osdl.org
> https://lists.osdl.org/mailman/listinfo/linux-pm
>

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