DSS and USBHOST powerdomains not entering low-power states on 37xx EVM

[Kevin Hilman]

Paul Walmsley <paul at pwsan.com> writes:

> Hi Kevin,
>
> On Mon, 6 Aug 2012, Kevin Hilman wrote:
>
>> Is this only happening on this 37xx platform?    Just curious, because
>> it seems to be a problem on any OMAP3xxx SoC.
>
> So far I've only run the baseline tests on 37xx, so wanted to state only 
> what was observed here.
>
>> ...it must be the usecounts that are not being updated.  This seems to
>> be a side effect of the pre/post transition optimization I did.  A quick
>> hack seems to indicate that that's indeed the case[1].  By default,
>> omap_sram_idle() is now only calling the pre/post callbacks for MPU,
>> NEON, PER, and CORE, and only if those domains are transitioning, so any
>> other domains not explicitly managed by the idle path have lots their
>> usecounting.  Oops.
>> 
>> I guess Tero's usecounting series should fix this up.
>
> Thanks for the diagnosis.  Care to put together a patch to fix this for 
> v3.6-rc?  

Done.

http://marc.info/?l=linux-omap&m=134437239010649&w=2

Kevin