netdev - Re: Extend smc911x to support LAN921x chips

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Date:	Tue, 9 Sep 2008 18:18:47 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Steve.Glendinning@...c.com
cc:	netdev@...r.kernel.org, Ian.Saturley@...c.com
Subject: Re: Extend smc911x to support LAN921x chips - differences?

Hi Steve,

On Tue, 9 Sep 2008, Steve.Glendinning@...c.com wrote:

> Did you have the in-tree driver succesfully working with LAN9115?

I haven't used smc911x for a while, but last time I used it (around 
2.6.21, I think), I think, it worked. Was a completely different hardware 
though.

> The only hardware difference between the two is that LAN921[5678] has an
> Auto-MDIX PHY.  This adds a configuration bit in one of the 
> vendor-specific
> PHY registers to force the feature off, but it defaults to Auto-MDIX 
> enabled.
> All of the SCR and MAC registers (and the remaining PHY registers) are 
> *identical*, so any working driver should just need the ID register
> changing to recognise the newer part.

It works now! Just chose a wrong bus-width.

> Early revisions of LAN911X had a hardware bug which is most commonly
> experienced when joining/leaving multicast groups.  The smsc911x driver
> contains a workaround for this, but the in-tree driver does not.  LAN921X
> came after this was fixed in hardware, so this workaround is not 
> necessary.
> 
> The vast majority of users i've worked with have ended up using the
> out-of-tree smsc911x driver, as it "just works" on many platforms.
> I'll be re-submitting another candidate when I've finished working on the
> LAN9500 USB ethernet driver, but for now the latest submission:
> 
> http://marc.info/?l=linux-netdev&m=121240395122475&w=2

Thanks, I was about to try yours, was the last attempt to use the stock 
driver, and, perhaps, unfortunately for you, it worked:-)

Thanks again
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
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