linux-kernel - Re: [alsa-devel] PNP_DRIVER_RES_DISABLE breaks swsusp at least with snd

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Message-Id: <200801122008.10313.rjw@sisk.pl>
Date:	Sat, 12 Jan 2008 20:08:09 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Rene Herman <rene.herman@...access.nl>
Cc:	Pierre Ossman <drzeus@...eus.cx>, Pavel Machek <pavel@...e.cz>,
	Ondrej Zary <linux@...nbow-software.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	ALSA development <alsa-devel@...a-project.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Andrew Morton <akpm@...l.org>, Takashi Iwai <tiwai@...e.de>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [alsa-devel] PNP_DRIVER_RES_DISABLE breaks swsusp at least with snd_cs4236

On Saturday, 12 of January 2008, Rene Herman wrote:
> On 12-01-08 16:21, Pierre Ossman wrote:
> 
> > Ah, sorry. It was a different thread. Look for a mail with the subject 
> > "PNP: do not stop/start devices in suspend/resume path" in the LKML och 
> > linux-pm archives.
> 
> Right, and I see that the removal of start/stop is already in -mm. That's 
> not going to work. Something (such as removing power) disabled Ondrej's 
> CS4236 and the pnp_start_dev() is needed to re-enable it upon resume.
> 
> >> But we certainly need the pnp_start_dev() in the current flow of
> >> things. It not being called is the problem this fixes...
> > 
> > I think the previous suggestion was that the drivers should call this,
> > not the core, so that it behaved more like other parts of the kernel
> > (e.g. PCI).
> 
> It seems all PnP drivers would need to stick a pnp_start_dev in their resume 
> method

Yes.

> then which means it really belongs in core.

Yes, if practical.

> One important point where PnP and PCI differ is that PnP allows to change the
> resources on a protocol level and I don't see how it could ever not be
> necessary to restore the state a user may have set if power has been
> removed. Hibernate is just that, isn't it?

Basically, yes, it is.

Thanks,
Rafael
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