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From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Chris Healy <cphealy@gmail.com>, Shawn Guo <shawnguo@kernel.org>,
	Fabio Estevam <festevam@gmail.com>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed
Date: Wed, 22 May 2019 10:56:23 -0700	[thread overview]
Message-ID: <CAHQ1cqHQWqpJdZjeBiOhEC5JjfcHdY+uA+kbCxzj6kRk9SLUXQ@mail.gmail.com> (raw)
In-Reply-To: <1558517601.2624.32.camel@pengutronix.de>

On Wed, May 22, 2019 at 2:33 AM Lucas Stach <l.stach@pengutronix.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

  reply	other threads:[~2019-05-22 17:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-22  7:12 [PATCH 1/3] ARM: dts: imx6: rdu2: Add node for UCS1002 USB charger chip Andrey Smirnov
2019-05-22  7:12 ` [PATCH 2/3] ARM: dts: imx6: rdu2: Disable WP for USDHC2 and USDHC3 Andrey Smirnov
2019-05-23  0:27   ` Chris Healy
2019-05-22  7:12 ` [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed Andrey Smirnov
2019-05-22  9:33   ` Lucas Stach
2019-05-22 17:56     ` Andrey Smirnov [this message]
2019-05-22 18:10       ` Chris Healy
2019-05-22  9:37 ` [PATCH 1/3] ARM: dts: imx6: rdu2: Add node for UCS1002 USB charger chip Lucas Stach
2019-05-22 17:49   ` Andrey Smirnov
2019-05-29  7:18 Andrey Smirnov
2019-05-29  7:18 ` [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed Andrey Smirnov
2019-05-29  8:27   ` Lucas Stach

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