[PATCH 07/13] Implement arch disable/enable irq hooks.
From: Scott Wood <hidden>
Date: 2007-05-07 18:29:57
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
These hooks ensure that a decrementer interrupt is not pending when suspending; otherwise, problems may occur. For example, with deep sleep on the 831x, a pending decrementer will cause a system freeze because the SoC thinks the decrementer interrupt would have woken the system, but the core must have interrupts disabled due to the setup required for deep sleep. Signed-off-by: Scott Wood <redacted> --- arch/powerpc/kernel/time.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 7cedef8..46546a3 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c@@ -707,6 +707,29 @@ void wakeup_decrementer(void) set_dec(ticks); } +/* Overrides the weak version in kernel/power/main.c */ +void arch_suspend_disable_irqs(void) +{ + preempt_disable(); + + /* Disable the decrementer, so that it doesn't interfere + * with suspending. + */ + + set_dec(0x7fffffff); + local_irq_disable(); + set_dec(0x7fffffff); +} + +/* Overrides the weak version in kernel/power/main.c */ +void arch_suspend_enable_irqs(void) +{ + wakeup_decrementer(); + + local_irq_enable(); + preempt_enable(); +} + #ifdef CONFIG_SMP void __init smp_space_timers(unsigned int max_cpus) {
--
1.5.0.3