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Date:   Mon, 27 Apr 2020 17:48:11 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        Leonard Crestez <leonard.crestez@....com>
CC:     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: [EXT] Re: [PATCH] net: ethernet: fec: Replace interrupt driven
 MDIO with polled IO

From: Andrew Lunn <andrew@...n.ch> Sent: Tuesday, April 28, 2020 12:46 AM
> 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";
> 
Add the similar change as below on i.MX6SX sdb, it still doesn't work.
As my previous mail, udelay(50) can work.(50us can be optimized)

--- a/arch/arm/boot/dts/imx6sx-sdb.dtsi
+++ b/arch/arm/boot/dts/imx6sx-sdb.dtsi
@@ -194,6 +194,8 @@
        phy-mode = "rgmii-id";
        phy-handle = <&ethphy1>;
        phy-reset-gpios = <&gpio2 7 GPIO_ACTIVE_LOW>;
+       phy-reset-duration = <10>;
+       phy-reset-post-delay = <100>;

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