netdev - Re: [PATCH next] ARM: dts: am57xx: fix networking on boards with ksz9031 phy

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Message-ID: <eab549aed345683a3ee79835369169c99e003488.camel@toradex.com>
Date:   Thu, 7 May 2020 08:42:50 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "tony@...mide.com" <tony@...mide.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "grygorii.strashko@...com" <grygorii.strashko@...com>
CC:     "o.rempel@...gutronix.de" <o.rempel@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>
Subject: Re: [PATCH next] ARM: dts: am57xx: fix networking on boards with
 ksz9031 phy

On Wed, 2020-05-06 at 22:11 +0300, Grygorii Strashko wrote:
> Since commit bcf3440c6dd7 ("net: phy: micrel: add phy-mode support for
> the
> KSZ9031 PHY") the networking is broken on boards:
>  am571x-idk
>  am572x-idk
>  am574x-idk
>  am57xx-beagle-x15
> 
> All above boards have phy-mode = "rgmii" and this is worked before
> because
> KSZ9031 PHY started with default RGMII internal delays configuration
> (TX
> off, RX on 1.2 ns) and MAC provided TX delay. After above commit, the
> KSZ9031 PHY starts handling phy mode properly and disables RX delay,
> as
> result networking is become broken.
> 
> Fix it by switching to phy-mode = "rgmii-rxid" to reflect previous
> behavior.
> 
> Cc: Oleksij Rempel <o.rempel@...gutronix.de>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Philippe Schenker <philippe.schenker@...adex.com>
> Fixes: commit bcf3440c6dd7 ("net: phy: micrel: add phy-mode support
> for the KSZ9031 PHY")
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Thanks Grygorii!

Reviewed-by: Philippe Schenker <
philippe.schenker@...adex.com>

> ---
>  arch/arm/boot/dts/am571x-idk.dts                | 4 ++--
>  arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi | 4 ++--
>  arch/arm/boot/dts/am57xx-idk-common.dtsi        | 4 ++--
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/am571x-idk.dts
> b/arch/arm/boot/dts/am571x-idk.dts
> index 669559c9c95b..c13756fa0f55 100644
> --- a/arch/arm/boot/dts/am571x-idk.dts
> +++ b/arch/arm/boot/dts/am571x-idk.dts
> @@ -190,13 +190,13 @@
>  
>  &cpsw_port1 {
>  	phy-handle = <&ethphy0_sw>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  	ti,dual-emac-pvid = <1>;
>  };
>  
>  &cpsw_port2 {
>  	phy-handle = <&ethphy1_sw>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  	ti,dual-emac-pvid = <2>;
>  };
>  
> diff --git a/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
> b/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
> index a813a0cf3ff3..565675354de4 100644
> --- a/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
> +++ b/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi
> @@ -433,13 +433,13 @@
>  
>  &cpsw_emac0 {
>  	phy-handle = <&phy0>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  	dual_emac_res_vlan = <1>;
>  };
>  
>  &cpsw_emac1 {
>  	phy-handle = <&phy1>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  	dual_emac_res_vlan = <2>;
>  };
>  
> diff --git a/arch/arm/boot/dts/am57xx-idk-common.dtsi
> b/arch/arm/boot/dts/am57xx-idk-common.dtsi
> index aa5e55f98179..a3ff1237d1fa 100644
> --- a/arch/arm/boot/dts/am57xx-idk-common.dtsi
> +++ b/arch/arm/boot/dts/am57xx-idk-common.dtsi
> @@ -408,13 +408,13 @@
>  
>  &cpsw_emac0 {
>  	phy-handle = <&ethphy0>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  	dual_emac_res_vlan = <1>;
>  };
>  
>  &cpsw_emac1 {
>  	phy-handle = <&ethphy1>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  	dual_emac_res_vlan = <2>;
>  };
>