linux-kernel - Re: [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed

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Message-ID: <1558517601.2624.32.camel@pengutronix.de>
Date:   Wed, 22 May 2019 11:33:21 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Chris Healy <cphealy@...il.com>, Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed

Hi Andrey,

Am Mittwoch, den 22.05.2019, 00:12 -0700 schrieb Andrey Smirnov:
> Cabling used to connect devices to USBH1 on RDU2 does not meet USB
> spec cable quality and cable length requirements to operate at High
> Speed, so limit the port to Full Speed only.

Really? I thought this issue is specific to the RDU1, but you've been
looking at this USB stuff for a lot longer than me.

Regards,
Lucas

> Reported-by: Chris Healy <cphealy@...il.com>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
> b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
> index 5484e4b87975..3b37fe68d373 100644
> --- a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
> @@ -772,6 +772,7 @@
>  &usbh1 {
>  	vbus-supply = <&reg_5p0v_main>;
>  	disable-over-current;
> +	maximum-speed = "full-speed";
>  	status = "okay";
>  };
>