[alsa-devel] PNP_DRIVER_RES_DISABLE breaks swsusp at least with snd_cs4236

Rafael J. Wysocki rjw at sisk.pl
Sat Jan 12 20:08:09 CET 2008

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


> 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.


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