linux-kernel - Re: [PATCH v2] lxt PHY: Support for the buggy LXT973 rev A2

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Message-ID: <505DE592.8060103@c-s.fr>
Date:	Sat, 22 Sep 2012 18:21:38 +0200
From:	leroy christophe <christophe.leroy@....fr>
To:	Lutz Jaenicke <ljaenicke@...ominate.com>
CC:	David S Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] lxt PHY: Support for the buggy LXT973 rev A2


Le 10/09/2012 20:17, Lutz Jaenicke a écrit :
> On Mon, Sep 10, 2012 at 05:45:49PM +0200, Christophe Leroy wrote:
>> This patch adds proper handling of the buggy revision A2 of LXT973 phy, adding
>> precautions linked to ERRATA Item 4:
>>
>> Item 4: MDIO Interface and Repeated Polling
>> Problem: Repeated polling of odd-numbered registers via the MDIO interface
>> 	randomly returns the contents of the previous even register.
>> Implication: Managed applications may not obtain the correct register contents
>> 	when a particular register is monitored for device status.
>> Workaround: None.
>> Status: This erratum has been previously fixed (in rev A3)
> Hmm. Were did you get the hardware from? We have been using LXT973 in
> our products and the A2 was replaced by A3 in 2003.
>
> Best regards,
> 	Lutz
They are custom boards that my company manufactures. Most boards 
manufactured before 2006 or 2007 have this buggy chip.

Regards
Christophe
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