linux-kernel - Re: [PATCH V2] au1xmmc: dev_pm

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Message-Id: <200907252221.45407.elendil@planet.nl>
Date:	Sat, 25 Jul 2009 22:21:42 +0200
From:	Frans Pop <elendil@...net.nl>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Manuel Lauss <manuel.lauss@...glemail.com>,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	Manuel Lauss <manuel.lauss@...il.com>,
	Arnaud Faucher <arnaud.faucher@...il.com>,
	Erik Ekman <erik@...o.se>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH V2] au1xmmc: dev_pm_ops conversion

On Saturday 25 July 2009, Rafael J. Wysocki wrote:
> > > > Was suspend to disk tested? It requires freeze()/thaw().
> > >
> > > Is that a regression introduced by this patch then? If so, many
> > > more of the recent dev_pm_ops conversion patches would need to be
> > > revisited.
>
> Yes, they would.  In general, you'd probably want to do something like
> this:
>
> static struct dev_pm_ops au1xmmc_pmops = {
>         .resume         = au1xmmc_resume,
>         .suspend                = au1xmmc_suspend,
>         .freeze         = au1xmmc_resume,
>         .thaw           = au1xmmc_suspend,
>         .restore                = au1xmmc_resume,
>         .poweroff       = au1xmmc_suspend,
> };
>
> but in this particular case it's probably better to define separate
> callbacks for .freeze() and .thaw() at least.
>
> During hibernation we call .freeze() and .thaw() before and after
> creating the image, respectively, and then .poweroff() is called right
> after the image has been saved.  During resume .freeze() is called
> after the image has been loaded and before the control goes to the
> image kernel, which then calls .restore().

Yes, I see that in drivers/base/platform.c (legacy) .suspend resp. .resume 
also got called for those cases?
Ouch :-(

I've added others who've submitted dev_pm_ops patches in CC.

> I'll fix up the floppy and hp-wmi patches.

Note that those are already in mainline, as is pcspkr.

Thanks,
FJP
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