This is a note to let you know that I've just added the patch titled
powerpc/windfarm: Fix noisy slots-fan on Xserve (rm31)
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-windfarm-fix-noisy-slots-fan-on-xserve-rm31.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fe956a1d4081ce1a959f87df397a15e252201f10 Mon Sep 17 00:00:00 2001
From: Aaro Koskinen <aaro.koskinen@xxxxxx>
Date: Sun, 21 Jul 2013 03:30:11 +0300
Subject: powerpc/windfarm: Fix noisy slots-fan on Xserve (rm31)
From: Aaro Koskinen <aaro.koskinen@xxxxxx>
commit fe956a1d4081ce1a959f87df397a15e252201f10 upstream.
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@xxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/macintosh/windfarm_rm31.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
--- 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)
Patches currently in stable-queue which might be from aaro.koskinen@xxxxxx are
queue-3.10/powerpc-windfarm-fix-noisy-slots-fan-on-xserve-rm31.patch
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