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

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Message-ID: <20120910181747.GA5960@lutz.bln.innominate.local>
Date:	Mon, 10 Sep 2012 20:17:47 +0200
From:	Lutz Jaenicke <ljaenicke@...ominate.com>
To:	Christophe Leroy <christophe.leroy@....fr>
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

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
-- 
Dr.-Ing. Lutz Jänicke
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