io-apic - no timer ticks after resume on IXP200

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(Cc:ing Andi because I seem to remember him reworking the code for this 
chipset)

Got it. After a suspend/resume cycle, I no longer have any timer ticks. 
Unsurprisingly, this breaks things. This is even true if I stub out the 
actual suspend code - that is, simply calling the device suspend and 
resume methods fails to set up the timer again properly.

So the situation is the following: without acpi_skip_timer_override, 
the system works fine until suspend/resume. At that point, I no longer 
get any timer ticks. With acpi_skip_timer_override, the timer works fine 
before and after suspend. I suspect that something in the apic 
suspend/resume code isn't setting things correctly? Is there any useful 
debug output I can provide?
-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
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