linux-kernel - Re: [RFC PATCH v3 1/2] PM / Core: suspend_again callback for suspend

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Message-ID: <20110512061928.GB2460@localhost.ucw.cz>
Date:	Thu, 12 May 2011 06:19:28 +0000
From:	Pavel Machek <pavel@....cz>
To:	MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...e.de>, kyungmin.park@...sung.com,
	myungjoo.ham@...il.com, Len Brown <len.brown@...el.com>
Subject: Re: [RFC PATCH v3 1/2] PM / Core: suspend_again callback for
	suspend_ops.

Hi!

> A system or a device may need to control suspend/wakeup events. It may
> want to wakeup the system after a predefined amount of time or at a
> predefined event decided while entering suspend for polling or delayed
> work. Then, it may want to enter suspend again if its predefined wakeup
> condition is the only wakeup reason and there is no outstanding events;
> thus, it does not wakeup the userspace unnecessary or unnecessary
> devices and keeps suspended as long as possible (saving the power).
> 
> Enabling a system to wakeup after a specified time can be easily
> achieved by using RTC. However, to enter suspend again immediately
> without invoking userland and unrelated devices, we need additional
> features in the suspend framework.

Looks ok to me.

>  /**
>   *	suspend_enter - enter the desired system sleep state.
>   *	@state:		state to enter
> + *	@pm_wkup_pending:	indicates that the power transition in progress
> + *				should be aborted.
>   *

Wowels are cheap, I'd add them here.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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