netdev - Re: [PATCH] net: dsa: mv88e6xxx: prevent 2500BASEX mode override

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Date:   Mon, 15 Feb 2021 16:11:37 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Marek Behun <marek.behun@....cz>,
        Nathan Rossi <nathan@...hanrossi.com>, netdev@...r.kernel.org,
        Nathan Rossi <nathan.rossi@...i.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH] net: dsa: mv88e6xxx: prevent 2500BASEX mode override

> If we can't switch between 1000base-X and 2500base-X, then we should
> not be calling phylink_helper_basex_speed() - and only one of those
> two capabilities should be set in the validation callback. I thought
> there were DSA switches where we could program the CMODE to switch
> between these two...

6390 family has a writable CMODE for ports 9 and 10, and you can
select various SERDES modes.

Nathan, what device are you using?

	Andrew