netdev - Re: Need help with mdiobus

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Date:   Sat, 15 Oct 2016 13:28:16 -0500
From:   Timur Tabi <timur@...eaurora.org>
To:     Andrew Lunn <andrew@...n.ch>, zefir.kurtisi@...atec.com
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: Re: Need help with mdiobus_register and phy

Andrew Lunn wrote:
> 1) Take the SerDes power down out of the suspend code for the at803x.
>
> 2) Assume MII_PHYID1/2 registers are not guaranteed to be available
> when the PHY is powered down. So get_phy_id should first read
> MII_BMCR. If it gets 0xffff, assume there is no PHY there. If the
> PDOWN bit is set, power up the PHY. Then reading the ID registers.

Before we take approach #1, I'd like to hear from the developer of that 
patch, Zefir.  According to him, that patch is necessary to fix a bug. 
I don't know if that bug exists only on his system, though.

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