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Re: kern/46696: uhub disables port where USB keyboard attached
The following reply was made to PR kern/46696; it has been noted by GNATS.
From: Matthias Drochner <m.drochner%googlemail.com@localhost>
Cc: Andreas Gustafsson <gson%gson.org@localhost>,
Subject: Re: kern/46696: uhub disables port where USB keyboard attached
Date: Sat, 22 Sep 2012 14:28:54 +0200
On Tue, 18 Sep 2012 09:53:41 +0200
Matthias Drochner <m.drochner%gmail.com@localhost> wrote:
> It is also strange that it hands over the device to USB1 at all,
> should better stay on ehci... Need to check specs for compatibility
I've identified the problem. Out reset is too long. It collides
with a timeout in the USB3 spec.
> > Matthias, can you identify the USB device that prompted the above
> > commit? And if it is a full-speed device, would it be possible
> > to use the 64-byte request size for full-speed devices but not
> > low-speed ones?
> I'm not 100% sure. Probably some Atmel-based embedded design.
> This is most certainly a full speed one, so it is better to
> restrict the effect of your patch to low-speed.
Here is a citation which confirms what I said about the 64-byte
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