netdev - Re: [PATCH] SSB / B44: fix WOL for BCM4401

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Date:	Wed, 3 Dec 2014 11:14:52 -0500
From:	"John W. Linville" <linville@...driver.com>
To:	Michael Büsch <m@...s.ch>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	Andrey Skvortsov <andrej.skvortzov@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Gary.Zambrano@...gic.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	b43-dev <b43-dev@...ts.infradead.org>,
	Rafał Miłecki <zajec5@...il.com>
Subject: Re: [PATCH] SSB / B44: fix WOL for BCM4401

On Wed, Dec 03, 2014 at 04:18:55PM +0100, Michael Büsch wrote:
> On Tue, 02 Dec 2014 16:23:49 -0600
> Larry Finger <Larry.Finger@...inger.net> wrote:
> 
> > On 12/02/2014 02:12 PM, Michael Büsch wrote:
> > > On Tue, 2 Dec 2014 23:01:29 +0300
> > > Andrey Skvortsov <andrej.skvortzov@...il.com> wrote:
> > >
> > >> On Mon, Dec 01, 2014 at 10:10:23PM +0100, Michael Büsch wrote:
> > >>> On Mon,  1 Dec 2014 23:46:38 +0300
> > >>> Andrey Skvortsov <andrej.skvortzov@...il.com> wrote:
> > >>>
> > >>>> Wake On Lan was not working on laptop DELL Vostro 1500.
> > >>>> If WOL was turned on, BCM4401 was powered up in suspend mode. LEDs blinked.
> > >>>> But the laptop could not be woken up with the Magic Packet. The reason for
> > >>>> that was that PCIE was not enabled as a system wakeup source and
> > >>>> therefore the host PCI bridge was not powered up in suspend mode.
> > >>>> PCIE was not enabled in suspend by PM because no child devices were
> > >>>> registered as wakeup source during suspend process.
> > >>>> On laptop BCM4401 is connected through the SSB bus, that is connected to the
> > >>>> PCI-Express bus. SSB and B44 did not use standard PM wakeup functions
> > >>>> and did not forward wakeup settings to their parents.
> > >>>> To fix that B44 driver enables PM wakeup and registers new wakeup source
> > >>>> using device_set_wakeup_enable(). Wakeup is automatically reported to the parent SSB
> > >>>> bus via power.wakeup_path. SSB bus enables wakeup for the parent PCI bridge, if there is any
> > >>>> child devices with enabled wakeup functionality. All other steps are
> > >>>> done by PM core code.
> > >>>
> > >>> Thanks, this looks good.
> > >>> I assume you tested this (I currently don't have a device to test this).
> > >>
> > >> Sure, I've tested it. WOL from suspend is working and after resume from hibernate Ethernet is working too.
> > >
> > > That sounds good, indeed.
> > > I'd still prefer, if someone with b43 (wireless) would test it, too.
> > 
> > I did a partial test with my PowerBook G4. With the patch installed, it would 
> > both suspend and hibernate, but WOL would be impossible. This computer uses a 
> > PCMCIA version of the BCM4318, and power is turned off to the PCMCIA card when 
> > suspended or hibernating.
> 
> Thanks for testing.
> 
> John, can you take this one? Or do we need to split the b44 part out?
> I added my Signed-off.

Um, sure...3.19 is OK I presume?

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.
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