From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Tvrtko A. Ursulin" Subject: Re: [Regression in 2.6.29] forcedeth doesn't work after resume from hibernation (was: Re: Resume after hibernation regression in 2.6.29) Date: Sat, 4 Apr 2009 14:04:24 +0100 Message-ID: <200904041404.24616.tvrtko@ursulin.net> References: <200903261920.32173.tvrtko@ursulin.net> <9ae48b020904030824o1f94831asb60f979b3e489a8b@mail.gmail.com> <1238780473.19305.3.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Cc: "Rafael J. Wysocki" , Pavel Machek , "linux-pm" , kernel list , Tobias Diedrich , Ayaz Abdulla , netdev , Arthur Jones , Andrew Morton , "David S. Miller" , stable@kernel.org To: Ed Swierk Return-path: Received: from mk-outboundfilter-3.mail.uk.tiscali.com ([212.74.114.23]:56832 "EHLO mk-outboundfilter-3.mail.uk.tiscali.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752172AbZDDNEc (ORCPT ); Sat, 4 Apr 2009 09:04:32 -0400 In-Reply-To: <1238780473.19305.3.camel@localhost.localdomain> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: On Friday 03 April 2009 18:41:12 Ed Swierk wrote: > On Fri, 2009-04-03 at 08:24 -0700, Ed Swierk wrote: > > On Fri, Mar 27, 2009 at 1:09 PM, Rafael J. Wysocki wrote: > > > I was able to reproduce the problem and identify the commit that broke > > > the resume of forcedeth, which turned out to be: > > > > > > commit cb52deba12f27af90a46d2f8667a64888118a888 > > > Author: Ed Swierk > > > Date: Mon Dec 1 12:24:43 2008 +0000 > > > > > > forcedeth: power down phy when interface is down > > > > > > Signed-off-by: Ed Swierk > > > Tested-by: Arthur Jones > > > Signed-off-by: Andrew Morton > > > Signed-off-by: David S. Miller > > > > > > Since I have no slightest idea of what this commit is supposed to > > > achieve, I can only ask for reverting it. It reverts cleanly, BTW. > > > > The change causes forcedeth to bring down the physical link when an > > interface goes down; leaving it up causes the switch at the other end > > to think the port is still active, with potentially random speed and > > duplex parameters. > > > > It's possible that the forcedeth driver needs to reset autonegotiation > > after bringing it up the link again. > > > > Can you please try this on a 2.6.29 kernel that's exhibiting the > > symptoms you describe, after resuming the machine from hibernation: > > > > ethtool -s eth1 autoneg off speed 100 duplex full > > ethtool -s eth1 autoneg on > > > > This should reset autonegotiation manually and bring the link. Let me > > know how it goes. > > Also please try this patch; it fixes the problem on my test system (a > DFI board with an nVidia MCP55). > > Signed-off-by: Ed Swierk > -- > --- linux-2.6.29.x86_64/drivers/net/forcedeth.c.orig 2009-03-23 > 16:12:14.000000000 -0700 +++ > linux-2.6.29.x86_64/drivers/net/forcedeth.c 2009-04-03 10:11:26.839614710 > -0700 @@ -5995,6 +5995,9 @@ > for (i = 0;i <= np->register_size/sizeof(u32); i++) > writel(np->saved_config_space[i], base+i*sizeof(u32)); > > + /* restore phy state, including autoneg */ > + phy_init(dev); > + > netif_device_attach(dev); > if (netif_running(dev)) { > rc = nv_open(dev); Works for me on MCP73 as well. Although NIC LED is still on after hibernation - seems to go off shortly before power off and then comes back on. Could be firmware issue I guess, this motherboard has always gulped power when off. Tvrtko