linux-kernel - Re: [Update][PATCH 6/10] PM / Domains: System-wide transitions support for generic domains (v5)

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Date:	Thu, 07 Jul 2011 17:29:35 -0700
From:	Kevin Hilman <khilman@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Walmsley <paul@...an.com>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [Update][PATCH 6/10] PM / Domains: System-wide transitions support for generic domains (v5)

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Make generic PM domains support system-wide power transitions
> (system suspend and hibernation).  Add suspend, resume, freeze, thaw,
> poweroff and restore callbacks to be associated with struct
> generic_pm_domain objects and make pm_genpd_init() use them as
> appropriate.
>
> The new callbacks do nothing for devices belonging to power domains
> that were powered down at run time (before the transition).  

Thinking about this some more, how is a driver supposed to reconfigure
wakeups during suspend if it has already been runtime suspended?

For example, assume a device where device_may_wakeup() == false.  This
means wakeups during *suspend* are disabled, but wakeups wakeups are
assumed to enabled when it is runtime suspended.

So now, assume this device is RPM_SUSPENDED, it has wakeups *enabled*,
and then system suspend comes along.  

With this current patch, the driver will never receive any callbacks, so
it can never disable its wakeups.  

Am I missing something?

Kevin
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