From: khilman@ti•com (Kevin Hilman)
To: linux-arm-kernel@lists•infradead.org
Subject: DSS and USBHOST powerdomains not entering low-power states on 37xx EVM
Date: Tue, 07 Aug 2012 13:48:02 -0700 [thread overview]
Message-ID: <87628u2zul.fsf@ti.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1208070401530.21945@utopia.booyaka.com> (Paul Walmsley's message of "Tue, 7 Aug 2012 04:05:33 -0600 (MDT)")
Paul Walmsley <paul@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
prev parent reply other threads:[~2012-08-07 20:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-03 20:05 DSS and USBHOST powerdomains not entering low-power states on 37xx EVM Paul Walmsley
2012-08-06 21:31 ` Kevin Hilman
2012-08-07 10:05 ` Paul Walmsley
2012-08-07 20:48 ` Kevin Hilman [this message]
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