netdev - Compex FreedomLine 32 PnP-PCI2 broken with de2104x

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Date:	Sat, 26 Jan 2008 21:58:10 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	jgarzik@...ox.com
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Compex FreedomLine 32 PnP-PCI2 broken with de2104x

Hello,
I was having problems with these FreedomLine cards with Linux before but 
tested it thoroughly today. This card uses DEC 21041 chip and has TP and BNC 
connectors:

00:12.0 Ethernet controller [0200]: Digital Equipment Corporation DECchip 
21041 [Tulip Pass 3] [1011:0014] (rev 21)

de2104x driver was loaded automatically by udev and card seemed to work. Until 
I disconnected the TP cable and putting it back after a while. The driver 
then switched to (non-existing) AUI port and remained there. I tried to set 
media to TP using ethtool - and the whole kernel crashed because of 
        BUG_ON(de_is_running(de));
in de_set_media(). Seems that the driver is unable to stop the DMA in 
de_stop_rxtx().

I commented out AUI detection in the driver - this time it switched to BNC 
after unplugging the cable and remained there. I also attempted to reset the 
chip when de_stop_rxtx failed but failed to do it.

Then I found that there's de4x5 driver which supports the same cards as 
de2104x (and some other too) - and this one works fine! I can plug and unplug 
the cable and even change between TP and BNC ports just by unplugging one and 
plugging the other cable in. Unfortunately, this driver is blacklisted by 
default - at least in Slackware and Debian.

The question is: why does de2104x exist? Does it work better with some 
hardware?

BTW. Found that the problem exist at least since 2003:
http://oss.sgi.com/archives/netdev/2003-08/msg00951.html

-- 
Ondrej Zary
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