Re: [lm-sensors] [PATCH v3 7/7] hwmon: (w83627ehf) Use 16 bit fan

[Guenter Roeck <guenter.roeck@ericsson.com>]

On Sat, Feb 12, 2011 at 01:56:09PM -0500, Andrew Lutomirski wrote:
> On Sat, Feb 12, 2011 at 12:55 PM, Guenter Roeck
> <guenter.roeck@ericsson.com> wrote:
> > On Sat, Feb 12, 2011 at 11:01:11AM -0500, Andrew Lutomirski wrote:
> > [ ... ]
> >
> > Actually,
> >
> >> fan2_min = 200 (div = 64):
> >> fan2_input = 138 (read at a different time, so may differ a little)
> >>
> >> [56013.556243] Reg 0029 = 99
> >> [56013.556286] Reg 0630 = 0046
> >> [56013.556453] Reg 0658 = 0089
> >>
> >> fan2_min = 502 (div = 32):
> >> fan2_input = 0 (read at a different time, so may differ a little)
> >>
> >> [56085.471567] Reg 0029 = 00
> >> [56085.471644] Reg 0632 = 0000
> >> [56085.471804] Reg 0658 = 0000
> >
> > Must have been blind. So the RPM register returns 0 as well. Not good.
> > Wonder what is going on.
> 
> So far, the highest number I've been able to get out of the counter
> register is 0x2e8 by setting div = 16 and playing with the pwm.
> 
> If I set div = 8, then I can't get much above 0x10b.
> 
> I have no idea what's going on either.
> 
Do you always get an output with div=8, or was that at a higher fan speed ?

Also, does it ever report 0xff in the 8-bit register, or does it always 
switch to 0x00 ?

> I tried writing 0x80 to 0x508 (which is supposed to turn the whole
> thing on), but the only bits that seem to stick are 0x7, so I have no
> idea what's going on.
> 
If you set 0x508 to 0, you might see 0xff in the 8-bit register; at least
this is what I see. The register seems to be write-only.


Thanks,
Guenter

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