David Brownell wrote:
>> > ACPI defines processor power-saving states C0, C1, C2 and C3. We cannot
>> > enter C3 if there is busmastering activity, and so we check BM_STS. If thi
>s
>> > is high when it should not be, and we are therefore not using C3, we are
>> > losing battery life.
>>
>> USB causes continuous bus mastering.
>
>OHCI tries to shut everything down; EHCI too. If those are
>continuously mastering, it's a bug of some kind. I don't know
>about UHCI though -- those drivers just seem to reset the
>chip on suspend.
won't an ohci chip write the frame # into the hcca once every ms?
(even when idle?)
-brad
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