linux-kernel - Re: [RFC PATCH v2 1/3] PM / Core: suspend

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Message-ID: <20110426221420.GC29092@elf.ucw.cz>
Date:	Wed, 27 Apr 2011 00:14:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Greg KH <gregkh@...e.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	linux-pm@...ts.linux-foundation.org,
	Len Brown <len.brown@...el.com>,
	"Jean Delvare (PC drivers core)" <khali@...ux-fr.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	kyungmin.park@...sung.com, myungjoo.ham@...il.com,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RFC PATCH v2 1/3] PM / Core: suspend_again callback for
 device PM.

Hi!

> > > What is the root problem that this is trying to solve?
> > 
> > It is trying to fix machines that need to run periodic kernel tasks
> > even when user asked them to sleep. Zaurus needs to periodicaly wake
> > up to be able to charge battery in s2ram state, for example.
> 
> That sounds like a bug in userspace you are trying to work around.  Why
> not solve it there first?

Can you be more specific?

The userspace is standard Debian; or maybe even init=/bin/bash. I want
to sleep the machine before I move, so I do echo mem >
/sys/power/state, as I do on PC.

Then I do plug the machine into AC when I move near outlet. In PC,
embedded controller wakes up and starts charging. In Zaurus, it is
kernel (SPI+charging drivers) that wake up, start charging, and go
back to sleep.

Then I (the user) press the power button and get "bash#" back. Where
is the userspace bug?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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