linux-kernel - Re: [PATCH] PCI PM: Read device power state from register after updating it (rev. 2)

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Message-Id: <200909222151.36022.rjw@sisk.pl>
Date:	Tue, 22 Sep 2009 21:51:35 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] PCI PM: Read device power state from register after updating it (rev. 2)

On Tuesday 22 September 2009, Arjan van de Ven wrote:
> On Mon, 21 Sep 2009 23:37:01 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> >  
> > -	dev->current_state = state;
> > +	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
> > +	dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
> > +	/* Return error code if we have failed to change the state */
> > +	if (dev->current_state != state)
> > +		dev_info(&dev->dev, "Refused to change power state, "
> > +			"currently in D%d\n", dev->current_state);
> 
> I would suspect that you want this message only once...
> to avoid it flooding logs and such

Hmm?  I don't think we use pci_set_power_state() _that_ often.

> or at least ratelimiting it

That sounds like a good idea, though, will respin.
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