linux-kernel - Re: [PATCH V2] PM / Domains: Remove cpuidle attach

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Message-ID: <7h7fo97ny8.fsf@deeprootsystems.com>
Date:	Tue, 01 Sep 2015 15:51:43 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	rjw@...ysocki.net, zhaoyang.huang@...aro.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org (open list:GENERIC PM DOMAINS),
	linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH V2] PM / Domains: Remove cpuidle attach

Daniel Lezcano <daniel.lezcano@...aro.org> writes:

> The power domains code allows to tie a cpuidle state with a power domain.
>
> Preventing the cpuidle framework to enter a specific idle state by disabling
> from the power domain framework is a good idea. Unfortunately, the current
> implementation has some gaps with a SMP system and a complex cpuidle
> implementation. Enabling a power domain wakes up all the cpus even if a cpu
> does not belong to the power domain.
>
> There is some work to do a logical representation with the power domains of
> the hardware dependencies (eg. a cpu belongs to a power domains, these power
> domains belong to a higher power domain for a cluster, etc ...). A new code
> relying on the genpd hierarchy to disable the idle states would make more
> sense.
>
> As the unique user of this code has been removed, let's wipe out this code
> to prevent new user and to have a clean place to put a new implementation.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>

Acked-by: Kevin Hilman <khilman@...aro.org>
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