[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>
diff --git a/arch/ppc/platforms/pmac_cpufreq.c b/arch/ppc/platforms/pmac_cpufreq.c
index 48e482c..937f46d 100644
--- a/arch/ppc/platforms/pmac_cpufreq.c
+++ b/arch/ppc/platforms/pmac_cpufreq.c
@@ -271,6 +271,8 @@
#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 @@
debug_calc_bogomips();
#endif
+ pmu_resume();
+
preempt_enable();
return 0;
diff --git a/arch/ppc/syslib/open_pic.c b/arch/ppc/syslib/open_pic.c
index 9d4ed68..000ba47 100644
--- a/arch/ppc/syslib/open_pic.c
+++ b/arch/ppc/syslib/open_pic.c
@@ -275,7 +275,7 @@
}
#endif
-#if defined(CONFIG_EPIC_SERIAL_MODE) || defined(CONFIG_PM)
+#if defined(CONFIG_EPIC_SERIAL_MODE)
static void openpic_reset(void)
{
openpic_setfield(&OpenPIC->Global.Global_Configuration0,
@@ -993,8 +993,6 @@
return 0;
}
- openpic_reset();
-
/* OpenPIC sometimes seem to need some time to be fully back up... */
do {
openpic_set_spurious(OPENPIC_VEC_SPURIOUS);
diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index e654aa5..bb9f404 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -2421,7 +2421,7 @@
/* Re-enable local CPU interrupts */
local_irq_enable();
- mdelay(100);
+ mdelay(10);
preempt_enable();
/* Re-enable clock spreading on some machines */
@@ -2549,7 +2549,9 @@
return ret;
}
- printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
+ /* Stop environment and ADB interrupts */
+ pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, 0);
+ pmu_wait_complete(&req);
/* Tell PMU what events will wake us up */
pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_CLR_WAKEUP_EVENTS,
@@ -2611,8 +2613,6 @@
pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
pmu_wait_complete(&req);
- printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
-
pmac_wakeup_devices();
return 0;
