* how can we modify voltage on DVFS through Linux
@ 2009-10-16 19:27 Priya Sehgal
2009-10-17 19:18 ` Liam Girdwood
0 siblings, 1 reply; 2+ messages in thread
From: Priya Sehgal @ 2009-10-16 19:27 UTC (permalink / raw)
To: linux-pm
[-- Attachment #1.1: Type: text/plain, Size: 473 bytes --]
Hello,
I am working on DVFS capable CPU - Nehalem quad core and I need to modify
the
CPU speed and voltage. I disabled cpuspeed service on my machine and
modified
some piece of cpuspeed code, to change the frequency of all the CPUs the way
I want.
I am curious whether the voltage gets increased and decreased in proportion
to the
frequency, or can we control the voltage separately. I could not locate any
/sys entries for voltage
only for frequency.
--
Regards,
Priya
[-- Attachment #1.2: Type: text/html, Size: 529 bytes --]
[-- Attachment #2: Type: text/plain, Size: 0 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: how can we modify voltage on DVFS through Linux
2009-10-16 19:27 how can we modify voltage on DVFS through Linux Priya Sehgal
@ 2009-10-17 19:18 ` Liam Girdwood
0 siblings, 0 replies; 2+ messages in thread
From: Liam Girdwood @ 2009-10-17 19:18 UTC (permalink / raw)
To: Priya Sehgal; +Cc: linux-pm
On Fri, 2009-10-16 at 15:27 -0400, Priya Sehgal wrote:
> Hello,
> I am working on DVFS capable CPU - Nehalem quad core and I need to
> modify the
> CPU speed and voltage. I disabled cpuspeed service on my machine and
> modified
> some piece of cpuspeed code, to change the frequency of all the CPUs
> the way I want.
>
> I am curious whether the voltage gets increased and decreased in
> proportion to the
> frequency, or can we control the voltage separately. I could not
> locate any /sys entries for voltage
> only for frequency.
>
Have a look at voltage regulator framework in include/linux/regulator.
It's used for CPU DVFS on ARM atm.
Liam
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2009-10-17 19:18 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-10-16 19:27 how can we modify voltage on DVFS through Linux Priya Sehgal
2009-10-17 19:18 ` Liam Girdwood
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox