netdev - Re: 2.6.29-rc3: tg3 dead after resume

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Message-ID: <20090129222247.GA13861@xw6200.broadcom.net>
Date:	Thu, 29 Jan 2009 14:22:47 -0800
From:	"Matt Carlson" <mcarlson@...adcom.com>
To:	"Parag Warudkar" <parag.lkml@...il.com>
cc:	"Matthew Carlson" <mcarlson@...adcom.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: 2.6.29-rc3: tg3 dead after resume

On Thu, Jan 29, 2009 at 02:06:35PM -0800, Parag Warudkar wrote:
> 
> 
> On Thu, 29 Jan 2009, Matt Carlson wrote:
> 
> > Can you apply the following test patch and see if it helps?  The patch
> > does two things.  First, it enables a bit which should restore firmware
> > communication.  If that fixes the problem, then let me know and I'll
> > spin a proper patch.
> > 
> > In the event that it doesn't work, the patch goes on to test the memory
> > mapping by simply printing the register value at offset 0x0.  The value
> > should be the device's vendor ID and device ID.  Please post the
> > results so that I can verify it.
> > 
> > 
> > diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
> > index 8b3f846..39fce42 100644
> > --- a/drivers/net/tg3.c
> > +++ b/drivers/net/tg3.c
> > @@ -7227,6 +7227,11 @@ static int tg3_init_hw(struct tg3 *tp, int reset_phy)
> >  {
> >  	tg3_switch_clocks(tp);
> >  
> > +	printk( KERN_NOTICE "%s: Reg value at offset 0x0 is 0x%x\n",
> > +		tp->dev->name, tr32(0x0) );
> > +
> > +	tw32(MEMARB_MODE, tr32(MEMARB_MODE) | MEMARB_MODE_ENABLE);
> > +
> >  	tw32(TG3PCI_MEM_WIN_BASE_ADDR, 0);
> >  
> >  	return tg3_reset_hw(tp, reset_phy);
> > 
> 
> Hi Matt,
> 
> Thanks for the patch. It didn't help with resume - but below is the 
> output after patching, let me know if you need more details.
> 
> ( Looks like 0xffffffff is invalid/corrupted device id /vendor id? )
> 
> [  163.856001] tg3 0000:0e:00.0: restoring config space at offset 0xc (was 0x0, writing 0x20040000)                                                                                                            
> [  163.856001] tg3 0000:0e:00.0: restoring config space at offset 0x3 (was 0x0, writing 0x10)                                                                                                                  
> [  163.856001] tg3 0000:0e:00.0: restoring config space at offset 0x1 (was 0x100000, writing 0x100006)                                                                                                         
> 
> [snip]
> 
> [  164.450277] pcieport-driver 0000:1e:00.0: setting latency timer to 64
> [  164.450415] pcieport-driver 0000:1e:01.0: setting latency timer to 64
> [  164.450493] tg3 0000:0e:00.0: restoring config space at offset 0xc (was 0x0, writing 0x20040000)
> [  164.451110] serial 00:08: activated
> 
> [snip]
> 
> [  168.913863] Restarting tasks ... done.
> [  170.332953] tg3 0000:0e:00.0: wake-up capability disabled by ACPI
> [  170.332960] tg3 0000:0e:00.0: PME# disabled
> [  170.333047] tg3 0000:0e:00.0: irq 54 for MSI/MSI-X
> [  170.333250] eth0: Reg value at offset 0x0 is 0xffffffff
                                           ^^^^^^^^^^^^^^^^^
So here is our problem.  For some reason the memory mapped IO is
failing.  I'll have to think about how and why that might happen.

FWIW, I can suspend and resume using the latest linux-2.6 kernel
on a machine with a similar chip here.  The problem doesn't seem to
affect all Broadcom devices.

> [  170.394281] [drm] Loading R500 Microcode
> [  170.394330] [drm] Num pipes: 1
> [  171.726650] tg3: eth0: No firmware running.
> [  183.119745] ADDRCONF(NETDEV_UP): eth0: link is not ready
> 
> 
> Parag
> 

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