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Date:   Thu, 7 May 2020 06:40:56 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Tony Lindgren <tony@...mide.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Philippe Schenker <philippe.schenker@...adex.com>
Subject: Re: [PATCH next] ARM: dts: am437x: fix networking on boards with
 ksz9031 phy

Hi Grygorii,

thank you for you patches!

On Wed, May 06, 2020 at 10:08:35PM +0300, Grygorii Strashko wrote:
> Since commit bcf3440c6dd7 ("net: phy: micrel: add phy-mode support for the
> KSZ9031 PHY") the networking is broken on boards:
>  am437x-gp-evm
>  am437x-sk-evm
>  am437x-idk-evm
> 
> 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>
> ---
>  arch/arm/boot/dts/am437x-gp-evm.dts  | 2 +-
>  arch/arm/boot/dts/am437x-idk-evm.dts | 2 +-
>  arch/arm/boot/dts/am437x-sk-evm.dts  | 4 ++--
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/am437x-gp-evm.dts b/arch/arm/boot/dts/am437x-gp-evm.dts
> index 811c8cae315b..d692e3b2812a 100644
> --- a/arch/arm/boot/dts/am437x-gp-evm.dts
> +++ b/arch/arm/boot/dts/am437x-gp-evm.dts
> @@ -943,7 +943,7 @@
>  
>  &cpsw_emac0 {
>  	phy-handle = <&ethphy0>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-rxid";
>  };
>  
>  &elm {
> diff --git a/arch/arm/boot/dts/am437x-idk-evm.dts b/arch/arm/boot/dts/am437x-idk-evm.dts
> index 9f66f96d09c9..a7495fb364bf 100644
> --- a/arch/arm/boot/dts/am437x-idk-evm.dts
> +++ b/arch/arm/boot/dts/am437x-idk-evm.dts
> @@ -504,7 +504,7 @@
>  
>  &cpsw_emac0 {
>  	phy-handle = <&ethphy0>;
> -	phy-mode = "rgmii";
> +	phy-mode = "rgmii-id";
>  };

Do you have here really rgmii-id?


>  &rtc {
> diff --git a/arch/arm/boot/dts/am437x-sk-evm.dts b/arch/arm/boot/dts/am437x-sk-evm.dts
> index 25222497f828..4d5a7ca2e25d 100644
> --- a/arch/arm/boot/dts/am437x-sk-evm.dts
> +++ b/arch/arm/boot/dts/am437x-sk-evm.dts
> @@ -833,13 +833,13 @@
>  
>  &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>;
>  };
>  
> -- 
> 2.17.1

Regards,
Oleksij
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