From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at
 start
Date: Wed, 24 Aug 2016 16:44:40 +0200
Message-ID: <57BDB2D8.4080507@linaro.org>
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To: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Michael Ellerman <mpe@ellerman.id.au>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Michael Neuling <michael.neuling@au1.ibm.com>, Paul Mackerras <paulus@samba.org>, Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Cc: Anton Blanchard <anton@samba.org>, linux-pm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
List-Id: linux-pm@vger.kernel.org

On 08/19/2016 12:26 AM, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
> 
> Currently all the idle states registered by a cpu-idle driver are
> enabled by default. This patch adds a mechanism which allows the
> driver to hint if an idle-state should start in a disabled state. The
> cpu-idle core will use this hint to appropriately initialize the
> usage->disable knob of the CPU device idle state.

Why do you need to do that ?

> The state can be enabled at run time by echo'ing a zero to the sysfs
> "disable" control file.

... for each cpu.


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