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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2005-05-27 12:53:02 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-28 11:14:01 -0700
commitb16eeb47292597a8bf3ad53fdaf1f727f57bd8e4 (patch)
tree93325bd2b4dd53e3064408c997f626b565c4423f /arch/ppc/platforms/pmac_cpufreq.c
parent49f384b82b03416dd7e4fc77847a959fe3247362 (diff)
[PATCH] ppc32: Fix cpufreq vs. sleep issue
Recent kernels occasionally trigger a PMU timeout on some mac laptops, typically on wakeup from sleep. This seem to be caused by either a too big latency caused by the cpufreq switch on wakeup from sleep or by an interrupt beeing lost due to the reset of the interrupt controller done during wakeup. This patch makes that code more robust by stopping PMU auto poll activity around cpufreq changes on machines that use the PMU for such changes (long latency switching involving a CPU hard reset and flush of all caches) and by removing the reset of the open pic interrupt controller on wakeup (that can cause the loss of an interrupt and Darwin doesn't do it, so it must not be necessary). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc/platforms/pmac_cpufreq.c')
-rw-r--r--arch/ppc/platforms/pmac_cpufreq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/ppc/platforms/pmac_cpufreq.c b/arch/ppc/platforms/pmac_cpufreq.c
index 48e482c8bd0..937f46df711 100644
--- a/arch/ppc/platforms/pmac_cpufreq.c
+++ b/arch/ppc/platforms/pmac_cpufreq.c
@@ -271,6 +271,8 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
#ifdef DEBUG_FREQ
printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
#endif
+ pmu_suspend();
+
/* Disable all interrupt sources on openpic */
pic_prio = openpic_get_priority();
openpic_set_priority(0xf);
@@ -345,6 +347,8 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
debug_calc_bogomips();
#endif
+ pmu_resume();
+
preempt_enable();
return 0;