linux-kernel - Re: [PATCH] PM / suspend: Always use deepest C-state in the "freeze" sleep state

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Message-ID: <5370D5E4.5040001@linaro.org>
Date:	Mon, 12 May 2014 16:08:36 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Aubrey Li <aubrey.li@...el.com>
Subject: Re: [PATCH] PM / suspend: Always use deepest C-state in the "freeze"
 sleep state

On 05/05/2014 12:51 AM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> If freeze_enter() is called, we want to bypass the current cpuidle
> governor and always use the deepest available (that is, not disabled)
> C-state, because we want to save as much energy as reasonably possible
> then and runtime latency constraints don't matter at that point, since
> the system is in a sleep state anyway.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>
> This is on top of https://patchwork.kernel.org/patch/4071541/ .
>

Wouldn't make sense to revisit play_dead instead ?



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