netdev - Re: net: phy: micrel KSZ9031 ifdown ifup issue

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Date:   Mon, 16 Sep 2019 17:13:16 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Paul Thomas <pthomas8589@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: net: phy: micrel KSZ9031 ifdown ifup issue

> When it is in the good state I see that reg 0x01 is 0x796d where bit
> 1.2 reports 'Link is up' and bit 1.5 reports 'Auto-negotiation process
> complete'. However, once I get to the bad state (it may take several
> tries of ifdown, ifup to get there) then reg 0x01 is 0x7649 reporting
> 'Link is down' and 'Auto-negotiation process not completed'. This can
> be fixed by resetting the phy './phytool write eth0/3/0 0x9140'
> 
> So, I guess that means the driver is doing what it is supposed to?
> Could we add quirk or something to reset the phy again from the driver
> if auto-negotiation doesn't complete with x seconds?

Hi Paul

Adding a timeout would make sense. But please try to hide all this
inside the PHY driver. Since it is being polled, the read_status()
should be called once per second, so you should be able to handle all
this inside that driver callback.

     Andrew