linux-kernel - Re: [PATCH v2] ARM: dts: imx7d-zii-rmu2: fix rgmii phy-mode for ksz9031 phy

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Date:   Mon, 24 Aug 2020 20:45:05 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Chris Healy <cphealy@...il.com>
Cc:     robh+dt@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, andrew@...n.ch,
        philippe.schenker@...adex.com, linux@...pel-privat.de,
        davem@...emloft.net, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        davidjoshuasim@...il.com
Subject: Re: [PATCH v2] ARM: dts: imx7d-zii-rmu2: fix rgmii phy-mode for
 ksz9031 phy

On Sat, Aug 22, 2020 at 07:25:05PM -0700, Chris Healy wrote:
> From: Chris Healy <cphealy@...il.com>
> 
> 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 <cphealy@...il.com>

Applied, thanks.