netdev - Re: [PATCH] I.MX6: Fix Ethernet PHY mode on Ventana boards

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Date:	Mon, 7 Dec 2015 06:34:34 -0800
From:	Tim Harvey <tharvey@...eworks.com>
To:	Krzysztof Hałasa <khalasa@...p.pl>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] I.MX6: Fix Ethernet PHY mode on Ventana boards

On Mon, Dec 7, 2015 at 4:56 AM, Krzysztof Hałasa <khalasa@...p.pl> wrote:
> Gateworks Ventana boards seem to need "RGMII-ID" (internal delay)
> PHY mode, instead of simple "RGMII", for their Marvell 88E1510
> transceiver. Otherwise, the Ethernet MAC doesn't work with Marvell PHY
> driver (TX doesn't seem to work correctly).
>
> Tested on GW5400 rev. C.
>
> This bug affects ARM Fedora 23.
>
> Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>
>
> diff --git a/arch/arm/boot/dts/imx6q-gw5400-a.dts b/arch/arm/boot/dts/imx6q-gw5400-a.dts
> index 822ffb2..6c168dc 100644
> --- a/arch/arm/boot/dts/imx6q-gw5400-a.dts
> +++ b/arch/arm/boot/dts/imx6q-gw5400-a.dts
> @@ -154,7 +154,7 @@
>  &fec {
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_enet>;
> -       phy-mode = "rgmii";
> +       phy-mode = "rgmii-id";
>         phy-reset-gpios = <&gpio1 30 GPIO_ACTIVE_HIGH>;
>         status = "okay";
>  };
> diff --git a/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi
> index f2867c4..90496aa 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi
> @@ -94,7 +94,7 @@
>  &fec {
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_enet>;
> -       phy-mode = "rgmii";
> +       phy-mode = "rgmii-id";
>         phy-reset-gpios = <&gpio1 30 GPIO_ACTIVE_LOW>;
>         status = "okay";
>  };
> diff --git a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> index 4493f6e..0a6730b 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> @@ -154,7 +154,7 @@
>  &fec {
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_enet>;
> -       phy-mode = "rgmii";
> +       phy-mode = "rgmii-id";
>         phy-reset-gpios = <&gpio1 30 GPIO_ACTIVE_LOW>;
>         status = "okay";
>  };
> diff --git a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> index cfad214..2c549ad 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> @@ -174,7 +174,7 @@
>  &fec {
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_enet>;
> -       phy-mode = "rgmii";
> +       phy-mode = "rgmii-id";
>         phy-reset-gpios = <&gpio1 30 GPIO_ACTIVE_LOW>;
>         status = "okay";
>  };
> diff --git a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> index 535b536..b4ea087 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> @@ -164,7 +164,7 @@
>  &fec {
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_enet>;
> -       phy-mode = "rgmii";
> +       phy-mode = "rgmii-id";
>         phy-reset-gpios = <&gpio1 30 GPIO_ACTIVE_LOW>;
>         status = "okay";
>  };
>
> --
> Krzysztof Halasa
>
> Industrial Research Institute for Automation and Measurements PIAP
> Al. Jerozolimskie 202, 02-486 Warsaw, Poland

Krzysztof,

It sounds like your saying this controls whether the phy is in charge
of delay vs the MAC. I have never needed to set this and haven't found
where its actually used (in at least 4.3). Is this caused by something
new in the kernel I haven't seen yet or is it possible you have board
that has an Ethernet issue?

Regards,

Tim

Tim Harvey - Principal Software Engineer
Gateworks Corporation - http://www.gateworks.com/
3026 S. Higuera St. San Luis Obispo CA 93401
805-781-2000
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