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Date:   Mon, 27 Apr 2020 18:46:20 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     Andy Duan <fugang.duan@....com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Chris Healy <Chris.Healy@....aero>,
        dl-linux-imx <linux-imx@....com>, Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH] net: ethernet: fec: Replace interrupt driven MDIO with
 polled IO

On Mon, Apr 27, 2020 at 03:19:54PM +0000, Leonard Crestez wrote:
> Hello,
> 
> This patch breaks network boot on at least imx8mm-evk. Boot works if I 
> revert just commit 29ae6bd1b0d8 ("net: ethernet: fec: Replace interrupt 
> driven MDIO with polled IO") on top of next-20200424.

Hi Leonard

Please could you try this:

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
index 951e14a3de0e..3c1adaf7affa 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
@@ -109,6 +109,7 @@ &fec1 {
        phy-handle = <&ethphy0>;
        phy-reset-gpios = <&gpio4 22 GPIO_ACTIVE_LOW>;
        phy-reset-duration = <10>;
+       phy-reset-post-delay = <100>;
        fsl,magic-packet;
        status = "okay";


There is an interesting post from Fabio Estevam

https://u-boot.denx.narkive.com/PlutD3Rg/patch-1-3-phy-atheros-use-ar8035-config-for-ar8031

Thanks
	Andrew

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