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Date:   Mon, 27 Jan 2020 14:08:34 +0000
From:   Russell King - ARM Linux admin <>
To:     Andrew Lunn <>
Cc:     Jose Abreu <>,
        "" <>,
        Joao Pinto <>,
        Giuseppe Cavallaro <>,
        Alexandre Torgue <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Maxime Coquelin <>,
        Florian Fainelli <>,
        Heiner Kallweit <>,
        "" <>
Subject: Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is
 up without PHY

On Mon, Jan 27, 2020 at 03:00:38PM +0100, Andrew Lunn wrote:
> > Yes, I realise that, but it comes with the expense of potentially
> > breaking mvneta and mvpp2, where the settings are automatically
> > passed between the PCS and MAC in hardware. I also believe DSA
> > works around this, and I need to look at that.
> Hi Russell
> The mv88e6xxx driver has code for when SGMII is used. It transfers the
> negotiated speed from the PCS to the MAC.
> But it recently turned out something like this is also needed for
> other link modes involving the SERDES. It used to work, i think
> because Phylink would initially configure the MAC approximately right,
> or the mv88e6xxx driver was looking at phylink state it should not.
> But it no longer works.

Can you give a hint which platform this is and how to reproduce it

RMK's Patch system:
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to 11.9Mbps down 500kbps up

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