[PATCH v1] ARM: protonic: disable on-die termination to fix PHY bootstrapping

[Sascha Hauer]

On Thu, Oct 08, 2020 at 12:23:14PM +0200, Oleksij Rempel wrote:
> If on-die termination is enabled, the RXC pin of iMX6 will be pulled
> high. Since we already have an 10K pull-down on board, the RXC level on
> PHY reset will be ~800mV, which is mostly interpreted as 1. On some
> reboots we get 0 instead and kernel can't detect the PHY properly.
> 
> Since the default 0x020e07ac value is 0, it is sufficient to remove this
> entry from the affected imxcfg files.
> 
> Since we get stable 0 on pin PHYADDR[2], the PHY address is changed from
> 4 to 0.
> 
> Fixes: 00adc1e33ef8 ("ARM: add imx6 based Protonic boads")
> Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
> ---
>  arch/arm/boards/protonic-imx6/flash-header-prti6q.imxcfg  | 1 -
>  arch/arm/boards/protonic-imx6/flash-header-vicut1q.imxcfg | 1 -
>  arch/arm/boards/protonic-imx6/flash-header-vicutp.imxcfg  | 1 -
>  arch/arm/dts/imx6q-prti6q.dts                             | 2 +-
>  arch/arm/dts/imx6q-vicut1.dts                             | 2 +-
>  5 files changed, 2 insertions(+), 5 deletions(-)

Applied to master, thanks

Sascha

> 
> diff --git a/arch/arm/boards/protonic-imx6/flash-header-prti6q.imxcfg b/arch/arm/boards/protonic-imx6/flash-header-prti6q.imxcfg
> index 68b7909f82..029edc248a 100644
> --- a/arch/arm/boards/protonic-imx6/flash-header-prti6q.imxcfg
> +++ b/arch/arm/boards/protonic-imx6/flash-header-prti6q.imxcfg
> @@ -120,4 +120,3 @@ wm 32 0x020e0614 0x000130b0
>  
>  /* RGMII config */
>  wm 32 0x020e0790 0x00080000 /* 1V2 DDR IO */
> -wm 32 0x020e07ac 0x00000200 /* 60 Ohm ODT */
> diff --git a/arch/arm/boards/protonic-imx6/flash-header-vicut1q.imxcfg b/arch/arm/boards/protonic-imx6/flash-header-vicut1q.imxcfg
> index a73a2c6fd0..f7e75b47bf 100644
> --- a/arch/arm/boards/protonic-imx6/flash-header-vicut1q.imxcfg
> +++ b/arch/arm/boards/protonic-imx6/flash-header-vicut1q.imxcfg
> @@ -124,4 +124,3 @@ wm 32 0x020e0614 0x000130b0
>  
>  /* RGMII config */
>  wm 32 0x020e0790 0x00080000 /* 1V2 DDR IO */
> -wm 32 0x020e07ac 0x00000200 /* 60 Ohm ODT */
> diff --git a/arch/arm/boards/protonic-imx6/flash-header-vicutp.imxcfg b/arch/arm/boards/protonic-imx6/flash-header-vicutp.imxcfg
> index 13887ade0b..e218279239 100644
> --- a/arch/arm/boards/protonic-imx6/flash-header-vicutp.imxcfg
> +++ b/arch/arm/boards/protonic-imx6/flash-header-vicutp.imxcfg
> @@ -171,4 +171,3 @@ wm 32 0x020e0614 0x000130b0
>  
>  /* RGMII config */
>  wm 32 0x020e0790 0x00080000 /* 1V2 DDR IO */
> -wm 32 0x020e07ac 0x00000200 /* 60 Ohm ODT */
> diff --git a/arch/arm/dts/imx6q-prti6q.dts b/arch/arm/dts/imx6q-prti6q.dts
> index acdb7b22d9..21e24222a0 100644
> --- a/arch/arm/dts/imx6q-prti6q.dts
> +++ b/arch/arm/dts/imx6q-prti6q.dts
> @@ -204,7 +204,7 @@
>  
>  		/* Microchip KSZ9031RNX PHY */
>  		rgmii_phy: ethernet-phy at 4 {
> -			reg = <4>;
> +			reg = <0>;
>  			interrupts-extended = <&gpio1 28 IRQ_TYPE_LEVEL_LOW>;
>  			reset-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;
>  			reset-assert-us = <10000>;
> diff --git a/arch/arm/dts/imx6q-vicut1.dts b/arch/arm/dts/imx6q-vicut1.dts
> index 9747b3c62e..9d1d6fa550 100644
> --- a/arch/arm/dts/imx6q-vicut1.dts
> +++ b/arch/arm/dts/imx6q-vicut1.dts
> @@ -29,7 +29,7 @@
>  
>  		/* Microchip KSZ9031RNX PHY */
>  		rgmii_phy: ethernet-phy at 4 {
> -			reg = <4>;
> +			reg = <0>;
>  			interrupts-extended = <&gpio1 28 IRQ_TYPE_LEVEL_LOW>;
>  			reset-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;
>  			reset-assert-us = <10000>;
> -- 
> 2.28.0
> 
> 
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