Re: p4tcc.c from FreeBSD

[Nate Lawson <nate@xxxxxxxx>]

YONETANI Tomokazu wrote:
> [CC on Nate Lawson hoping we can hear good news from him]
> On Sun, Jul 25, 2004 at 11:50:52AM +0000, Johannes Hofmann wrote:
> > This patch adds Pentium 4 Thermal Control Circuit (TCC) support from
> > FreeBSD (originally from OpenBSD, I think). 
> > It can be used to reduce the CPU speed without ACPI support and might be
> > useful on machines where ACPI has problems.
> > In my tests it actually slowed things down, but I have no results about
> > battery life yet.
>
> Thanks for the patch, but the last time this came up, we were going
> to wait for the cpufreq driver to be committed to FreeBSD, IIRC. I'm not
> sure about the detail of the cpufreq driver, but I hope it include
> support for Enhanced SpeedStep Technology(EST) on Pentium M processors,
> which is already implemented in NetBSD:
>
>    http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/i386/i386/est.c
>
> Of course this does not mean I'm against p4tcc.c driver to go into
> DragonFly tree as it's already been used in FreeBSD.

I'm still working on the cpufreq framework.  When it goes in, it will 
probably have support for P4-M SS, ICH SS, ACPI throttling, and ACPI Px 
states.  I will probably be committing it after the 5.3-RELEASE due to 
the need to focus on addressing other problems people are having with 
ACPI (pci irq routing) before the release.

When I bring it in, I will convert p4tcc and the longrun drivers to 
cpufreq as well.  If you want to import your driver before then, I don't 
see a problem.

--
-Nate