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

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Message-ID: <CAHQ1cqHQWqpJdZjeBiOhEC5JjfcHdY+uA+kbCxzj6kRk9SLUXQ@mail.gmail.com>
Date:   Wed, 22 May 2019 10:56:23 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Lucas Stach <l.stach@...gutronix.de>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Chris Healy <cphealy@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed

On Wed, May 22, 2019 at 2:33 AM Lucas Stach <l.stach@...gutronix.de> wrote:
>
> 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.
>

I am merely a messenger here. I didn't personally verify this to be
the case, so your knowledge is probably as good as mine. Chris
reported this based on feedback from their EE team, so he should know
all of the details better.

Thanks,
Andrey Smirnov