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

Paul Walmsley [off-list ref] writes:

Hi Kevin,

On Mon, 6 Aug 2012, Kevin Hilman wrote:

quoted

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.

quoted

...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