netdev - Re: [PATCH v3 net-next 07/12] net: ethernet: Add helper to remove a supported link mode

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Date:   Fri, 21 Sep 2018 10:17:35 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v3 net-next 07/12] net: ethernet: Add helper to remove a
 supported link mode

On Thu, Sep 20, 2018 at 02:51:06PM +0200, Andrew Lunn wrote:
> > eth0: no link
> >   registers for MII PHY 0: 
> >     1140 7949 0022 1622 0981 c1e1 000d 0000
> 
> Hi Simon
> 
> The ID registers 0022 1622 indicate this is a Micrel KSZ9031.
> Are you using the micrel PHY driver?


Yes, when the Link is successfully negotiated I see:

Micrel KSZ9031 Gigabit PHY e6800000.ethernet-ffffffff:00: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=e6800000.ethernet-ffffffff:00, irq=204)

> > I note a difference in the 3rd line of hex output: 7002 vs 6002
> > but I am unsure if that is relevant.
> 
> Register 20, or 0x14. The datasheet says "Reserved" and there is no
> description given :-(
> 
> I will decode the other registers and see if i can find anything.

Thanks, very much appreciated.

I believe your patch to disable Asym_Pause solves the immediate
problem I have observed.