linux-kernel - Re: [PATCH] de2104x: disable autonegotiation on broken hardware

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Date:	Thu, 23 Sep 2010 23:18:08 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	netdev@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] de2104x: disable autonegotiation on broken hardware

On Thursday 23 September 2010 23:03:13 Jeff Garzik wrote:
> On Thu, Sep 23, 2010 at 4:59 PM, Ondrej Zary <linux@...nbow-software.org> 
wrote:
> > At least on older 21041-AA chips (mine is rev. 11), TP duplex
> > autonegotiation causes the card not to work at all (link is up but no
> > packets are transmitted).
> >
> > de4x5 disables autonegotiation completely. But it seems to work on newer
> > (21041-PA rev. 21) so disable it only on rev<20 chips.
> >
> > Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
> >
> > --- linux-2.6.36-rc3-orig/drivers/net/tulip/de2104x.c   2010-08-29
> > 17:36:04.000000000 +0200 +++ linux-2.6.36-rc3/drivers/net/tulip/de2104x.c
> >        2010-09-24 00:27:41.000000000 +0200 @@ -364,6 +364,8 @@ static u16
> > t21040_csr15[] = { 0, 0, 0x00
> >  /* 21041 transceiver register settings: TP AUTO, BNC, AUI, TP, TP FD*/
> >  static u16 t21041_csr13[] = { 0xEF01, 0xEF09, 0xEF09, 0xEF01, 0xEF09, };
> >  static u16 t21041_csr14[] = { 0xFFFF, 0xF7FD, 0xF7FD, 0x6F3F, 0x6F3D, };
> > +/* If on-chip autonegotiation is broken, use half-duplex (FF3F) instead
> > */ +static u16 t21041_csr14_brk[] = { 0xFF3F, 0xF7FD, 0xF7FD, 0x6F3F,
> > 0x6F3D, }; static u16 t21041_csr15[] = { 0x0008, 0x0006, 0x000E, 0x0008,
> > 0x0008, };
> >
> >
> > @@ -1911,8 +1913,14 @@ fill_defaults:
> >        for (i = 0; i < DE_MAX_MEDIA; i++) {
> >                if (de->media[i].csr13 == 0xffff)
> >                        de->media[i].csr13 = t21041_csr13[i];
> > -               if (de->media[i].csr14 == 0xffff)
> > -                       de->media[i].csr14 = t21041_csr14[i];
> > +               if (de->media[i].csr14 == 0xffff) {
> > +                       /* autonegotiation is broken at least on some
> > chip +                          revisions - rev. 0x21 works, 0x11 does
> > not */ +                       if (de->pdev->revision < 0x20)
> > +                               de->media[i].csr14 = t21041_csr14_brk[i];
> > +                       else
> > +                               de->media[i].csr14 = t21041_csr14[i];
> > +               }
>
> Interesting...  I never knew about that quirk.

This errata document says that autonegotiation is somehow broken but it does 
not specify it further:
http://ftp.nluug.nl/ftp/ftp/pub/os/NetBSD/misc/dec-docs/ec-qd2ma-te.ps.gz

-- 
Ondrej Zary
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