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

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Date:	Tue, 2 Dec 2014 21:12:11 +0100
From:	Michael Büsch <m@...s.ch>
To:	Andrey Skvortsov <andrej.skvortzov@...il.com>
Cc:	"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>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH] SSB / B44: fix WOL for BCM4401

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.

-- 
Michael

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