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

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Date:   Wed, 29 May 2019 10:27:40 +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

Am Mittwoch, den 29.05.2019, 00:18 -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.
> 
> > Reported-by: Chris Healy <cphealy@...il.com>
> > Reviewed-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

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  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 04d4d4d7e43c..e1d8478884f9 100644
> --- a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
> @@ -805,6 +805,7 @@
>  &usbh1 {
> >  	vbus-supply = <&reg_5p0v_main>;
> >  	disable-over-current;
> > +	maximum-speed = "full-speed";
> >  	status = "okay";
>  };
>