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Date:   Fri, 17 Jan 2020 04:18:15 -0800 (PST)
From:   David Miller <>
Subject: Re: [PATCH net-next] net: dsa: felix: Don't restart PCS SGMII AN
 if not needed

From: Vladimir Oltean <>
Date: Thu, 16 Jan 2020 20:09:59 +0200

> From: Alex Marginean <>
> Some PHYs like VSC8234 don't like it when AN restarts on their system side
> and they restart line side AN too, going into an endless link up/down loop.
> Don't restart PCS AN if link is up already.
> Although in theory this feedback loop should be possible with the other
> in-band AN modes too, for some reason it was not seen with the VSC8514
> QSGMII and AQR412 USXGMII PHYs. So keep this logic only for SGMII where
> the problem was found.
> Fixes: bdeced75b13f ("net: dsa: felix: Add PCS operations for PHYLINK")
> Suggested-by: Vladimir Oltean <>
> Signed-off-by: Alex Marginean <>
> Signed-off-by: Vladimir Oltean <>


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