diff options
| author | Aaro Koskinen <aaro.koskinen@iki.fi> | 2013-07-21 03:30:11 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-01 13:11:47 +1000 |
| commit | fe956a1d4081ce1a959f87df397a15e252201f10 (patch) | |
| tree | 236b73915ded48c90f525223c541d0460ba5c03c /drivers/macintosh | |
| parent | 3be7db6ab45b21345386d1a466da133b19cde5e4 (diff) | |
| download | lwn-fe956a1d4081ce1a959f87df397a15e252201f10.tar.gz lwn-fe956a1d4081ce1a959f87df397a15e252201f10.zip | |
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>
Diffstat (limited to 'drivers/macintosh')
| -rw-r--r-- | drivers/macintosh/windfarm_rm31.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/macintosh/windfarm_rm31.c b/drivers/macintosh/windfarm_rm31.c index 0b9a79b2f48a..82fc86a90c1a 100644 --- a/drivers/macintosh/windfarm_rm31.c +++ b/drivers/macintosh/windfarm_rm31.c @@ -439,15 +439,15 @@ static void backside_setup_pid(void) /* Slots fan */ static const struct wf_pid_param slots_param = { - .interval = 5, - .history_len = 2, - .gd = 30 << 20, - .gp = 5 << 20, - .gr = 0, - .itarget = 40 << 16, - .additive = 1, - .min = 300, - .max = 4000, + .interval = 1, + .history_len = 20, + .gd = 0, + .gp = 0, + .gr = 0x00100000, + .itarget = 3200000, + .additive = 0, + .min = 20, + .max = 100, }; static void slots_fan_tick(void) |