linux-kernel - Re: [PATCH 0/3] coupled cpuidle state support

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Message-ID: <CAMQu2gwsw+RC+Y9P8r9Yjy+ADuQ-tPzcXPPncLxMjjb3tvdbbQ@mail.gmail.com>
Date:	Wed, 4 Jan 2012 18:27:29 +0100
From:	"Shilimkar, Santosh" <santosh.shilimkar@...com>
To:	Kevin Hilman <khilman@...com>
Cc:	Colin Cross <ccross@...roid.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-pm@...ts.linux-foundation.org,
	Len Brown <len.brown@...el.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Trinabh Gupta <g.trinabh@...il.com>,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>,
	linux-omap@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 0/3] coupled cpuidle state support

On Wed, Jan 4, 2012 at 1:41 AM, Kevin Hilman <khilman@...com> wrote:
> Colin Cross <ccross@...roid.com> writes:
>
>
>> This patch series implements an alternative solution, where each
>> cpu will wait in the WFI state until all cpus are ready to enter
>> a coupled state, at which point the coupled state function will
>> be called on all cpus at approximately the same time.
>
> This looks great, and is certainly preferred to hotplug IMO.
>
> [...]
>
>> None of the platforms I work with have an SMP idle implementation
>> upstream, so I can't easily show a patch that converts a platform
>> from hotplug governor to coupled cpuidle states.
>
> Basic OMAP4 CPUidle support is in now queued for v3.3 (see omap4
> branch Tony's tree[1].)
>
> Can you (or Santosh) send a patch that adds coupled support to that
> driver so it can see some broader testing on OMAP4?
>
I briefly attempted OMAP4 idle with this series but had some lock
up related issues which we faced in the older development.

Then I got busy into other activities which will keep me occupied for
next few weeks. I will be happy to share the patches in case some one
would like to have a look till then.

Regards
Santosh
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