linux-kernel - Re: [lm-sensors] [PATCH] hwmon: Add driver for VIA CPU core temperature

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Message-ID: <20090612125450.GK30843@prithivi.gnumonks.org>
Date:	Fri, 12 Jun 2009 20:54:50 +0800
From:	Harald Welte <HaraldWelte@...tech.com>
To:	"Michael S. Zick" <lkml@...ethan.org>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Tomaz Mertelj <tomaz.mertelj@...st.arnes.si>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [lm-sensors] [PATCH] hwmon: Add driver for VIA CPU core
	temperature

On Fri, Jun 12, 2009 at 06:46:45AM -0500, Michael S. Zick wrote:
> > Temperature values are supposed to be expressed in millidegrees C, not
> > degrees C as it seems to be doing (although 25 degrees C seems pretty
> > low for a CPU temperature?) The drivers needs to multiply values by
> > 1000 before exporting them to sysfs. Then "sensors" will report the
> > correct temperature value.
> > 
> 
> Ah, 25 degrees C is room temperature - real hard for the junction temperature
> to be 25 degrees C with power applied; lacking an infinitely perfect heatsink.
> 
> Look for an "off by one" error in shifting or masking the value.

there is no shifting and the masking is 0xffffffff :)

it might be that the BIOS is doing something wrong when programming the
calibration MSR's at early botoup.  I would need the contents of MSR 
0x1160 ... 0x116C as well as 0x1152 and 0x1153 to be able to determine that.

-- 
- Harald Welte <HaraldWelte@...tech.com>	    http://linux.via.com.tw/
============================================================================
VIA Free and Open Source Software Liaison
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