netdev - Re: issues to bring up two VSC8531 PHYs

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Message-ID: <fa806e4a-b706-ce54-b3e0-b95d065e8d4a@mistywest.com>
Date:   Fri, 21 Apr 2023 15:55:23 -0700
From:   Ron Eggler <ron.eggler@...tywest.com>
To:     Andrew Lunn <andrew@...n.ch>
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


On 4/21/23 09:35, Andrew Lunn wrote:
>>> 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.

The man page (https://www.man7.org/linux/man-pages/man8/ethtool.8.html) 
does not give any details about what phy_receive_errors or 
phy_idle_errors refer to exactly, is there any documentation about it 
that I could not find?


Ron

-- 
RON EGGLER Firmware Engineer (he/him/his) www.mistywest.com