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Date:   Sun, 23 Aug 2020 22:05:18 -0300
From:   Fabio Estevam <>
To:     Chris Healy <>
Cc:     Rob Herring <>, Shawn Guo <>,
        Sascha Hauer <>,
        Sascha Hauer <>,
        NXP Linux Team <>,
        Andrew Lunn <>,
        Philippe Schenker <>,
        Oleksij Rempel <>,
        "David S. Miller" <>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        linux-kernel <>,
Subject: Re: [PATCH v2] ARM: dts: imx7d-zii-rmu2: fix rgmii phy-mode for
 ksz9031 phy

Hi Chris,

On Sat, Aug 22, 2020 at 11:25 PM Chris Healy <> wrote:
> From: Chris Healy <>
> Since commit bcf3440c6dd7 ("net: phy: micrel: add phy-mode support for the
> KSZ9031 PHY") the networking is broken on the imx7d-zii-rmu2 board.
> The end result is that network receive behaviour is marginal with lots of
> RX CRC errors experienced and NFS frequently failing.
> Quoting the explanation from Andrew Lunn in commit 0672d22a19244
> ("ARM: dts: imx: Fix the AR803X phy-mode"):
> "The problem here is, all the DTs were broken since day 0. However,
> because the PHY driver was also broken, nobody noticed and it
> worked. Now that the PHY driver has been fixed, all the bugs in the
> DTs now become an issue"
> Fix it by switching to phy-mode = "rgmii-id".
> Fixes: bcf3440c6dd7 ("net: phy: micrel: add phy-mode support for the KSZ9031 PHY")
> Signed-off-by: Chris Healy <>

Reviewed-by: Fabio Estevam <>

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