powerpc/windfarm: Fix noisy slots-fan on Xserve (rm31)
authorAaro Koskinen <aaro.koskinen@iki.fi>
Sun, 21 Jul 2013 00:30:11 +0000 (03:30 +0300)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 1 Aug 2013 03:11:47 +0000 (13:11 +1000)
commitfe956a1d4081ce1a959f87df397a15e252201f10
tree236b73915ded48c90f525223c541d0460ba5c03c
parent3be7db6ab45b21345386d1a466da133b19cde5e4
powerpc/windfarm: Fix noisy slots-fan on Xserve (rm31)

slots-fan on G5 Xserve is always running at full speed with windfarm_rm31
driver, resulting in a very high acoustic noise level. It seems the fan
parameters are incorrect, and have been copied from the Drive Bay fan
(RPM, not present on rm31) of the legacy therm_pm72 driver. This patch
changes the parameters to match the Slots fan (PWM) of therm_pm72. With
the patch, slots-fan speed drops from 99% to 19% during normal use,
and slots-temp settle to ~42'C.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
CC: <stable@vger.kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
drivers/macintosh/windfarm_rm31.c