linux-kernel - Re: [PATCH 4/7] PM / Domains: Rework system suspend callback routines

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Message-ID: <20120217192928.GI2707@elf.ucw.cz>
Date:	Fri, 17 Feb 2012 20:29:28 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Kevin Hilman <khilman@...com>, jean.pihet@...oldbits.com
Subject: Re: [PATCH 4/7] PM / Domains: Rework system suspend callback
 routines

On Mon 2011-11-07 01:08:11, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> The current generic PM domains code attempts to use the generic
> system suspend operations along with the domains' device stop/start
> routines, which requires device drivers to assume that their
> system suspend/resume (and hibernation/restore) callbacks will always
> be used with generic PM domains.  However, in theory, the same
> hardware may be used in devices that don't belong to any PM domain,
> in which case it would be necessary to add "fake" PM domains to
> satisfy the above assumption.  Also, the domain the hardware belongs
> to may not be handled with the help of the generic code.
> 
> To allow device drivers that may be used along with the generic PM
> domains code of more flexibility, add new device callbacks, .freeze(),
> .freeze_late(), .thaw_early() and .thaw(), that can be supplied by
> the drivers in addition to their "standard" system suspend and
> hibernation callbacks.  These new callbacks, if defined, will be used
> by the generic PM domains code for the handling of system suspend and
> hibernation instead of the "standard" ones.  This will allow drivers
> to be designed to work with generic PM domains as well as without
> them.

Should this go to Documentation/ somewhere? May concern is that we
have way too many callbacks these days. Why is fake PM domain such a
bad thing?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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