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[PATCH] powerpc: more g5 overtemp problem fix 

Some G5s still occasionally experience shutdowns due to overtemp
conditions despite the recent fix. After analyzing logs from such
machines, it appears that the overtemp code is a bit too quick at
shutting the machine down when reaching the critical temperature (tmax +
8) and doesn't leave the fan enough time to actually cool it down. This
happens if the temperature of a CPU suddenly rises too high in a very
short period of time, or occasionally on boot (that is the CPUs are
already overtemp by the time the driver loads).

This patches makes the code a bit more relaxed, leaving a few seconds to
the fans to do their job before kicking the machine shutown.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin Herrenschmidt 2006-01-02 13:04:44 +11:00 committed by Linus Torvalds
parent 557962a926
commit f12f4d9030
1 changed files with 3 additions and 3 deletions
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6
drivers/macintosh/therm_pm72.c
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@ -923,7 +923,7 @@ static void do_monitor_cpu_combined(void)
if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) {
printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n",
temp_combi >> 16);
state0->overtemp = CPU_MAX_OVERTEMP;
state0->overtemp += CPU_MAX_OVERTEMP / 4;
} else if (temp_combi > (state0->mpu.tmax << 16))
state0->overtemp++;
else
@ -998,7 +998,7 @@ static void do_monitor_cpu_split(struct cpu_pid_state *state)
printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
" (%d) !\n",
state->index, temp >> 16);
state->overtemp = CPU_MAX_OVERTEMP;
state->overtemp += CPU_MAX_OVERTEMP / 4;
} else if (temp > (state->mpu.tmax << 16))
state->overtemp++;
else
@ -1060,7 +1060,7 @@ static void do_monitor_cpu_rack(struct cpu_pid_state *state)
printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
" (%d) !\n",
state->index, temp >> 16);
state->overtemp = CPU_MAX_OVERTEMP;
state->overtemp = CPU_MAX_OVERTEMP / 4;
} else if (temp > (state->mpu.tmax << 16))
state->overtemp++;
else