netdev - Re: issues to bring up two VSC8531 PHYs

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Message-ID: <7bb09c7c-24fc-4c8d-8068-f163082ab781@lunn.ch>
Date:   Fri, 21 Apr 2023 18:35:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ron Eggler <ron.eggler@...tywest.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        Russell King - ARM Linux <linux@...linux.org.uk>
Subject: Re: issues to bring up two VSC8531 PHYs

> > You can also try:
> > 
> > ethtool --phy-statistics ethX
> 
> after appliaction of the above patch, ethtool tells me
> 
> # ethtool --phy-statistics eth0
> PHY statistics:
>      phy_receive_errors: 65535
>     phy_idle_errors: 255

So these have saturated. Often these counters don't wrap, they stop at
the maximum value.

These errors also indicate your problem is probably not between the
MAC and the PHY, but between the PHY and the RJ45 socket. Or maybe how
the PHY is clocked. It might not have a stable clock, or the wrong
clock frequency.

    Andrew