[PATCH 1/3] mpc83xx: Power Management support

[Kumar Gala]

On Jun 26, 2008, at 9:39 AM, Liu Dave wrote:

>>> Basic PM support for 83xx.  Standby is implemented as sleep.
>>> Suspend-to-RAM is implemented as "deep sleep" (with the processor
>>> turned off) on 831x.  PCI agent power management is supported.
>>>
>>> Device power management of SOC peripherals is not yet supported.
>>
>> (Not comments on this patch, but related)
>>
>> Do you know if anyone is looking at making sure DOZE/NAP work on
>> 83xx?  We clearly don't flush the L1 cache today in the 6xx code.
>
> I did the test on 837x, the NAP did *not* work, due to the cache
> coherence issue.
> You are right, currently no flush L1 in the 6xx code, maybe it  
> depend on
> the
> platform hardware capability.

Ben told me the pmac HW/chipsets did something here to ensure that the  
core never actually went into NAP (or something like that) so they  
didn't have to flush the caches.

- k