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Date: Tue, 3 Mar 2015 12:01:04 +0100
From: Marius Strobl <marius@alchemy.franken.de>
To: Hans Petter Selasky <hselasky@FreeBSD.org>
Subject: Re: svn commit: r279563 - head/sys/dev/usb/controller
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On Tue, Mar 03, 2015 at 10:21:55AM +0000, Hans Petter Selasky wrote:
> Author: hselasky
> Date: Tue Mar  3 10:21:54 2015
> New Revision: 279563
> URL: https://svnweb.freebsd.org/changeset/base/279563
> 
> Log:
>   Add quirk for USB 3.0 controllers which don't support 64-bit DMA.
>   

Hrm, this is strange; I checked Linux sources when adding 64-bit DMA
support and while they handle tons of quirks for USB controllers
(which FreeBSD doesn't), they don't have a single such exception for
64-bit DMA. Are you sure using 64-bit DMA doesn't just reveal another
problem? F. e., Linux issues an extra doorbell ring for XHCI_NEC_HOST
and generally reads back the doorbell register in order to flush PCI
writes.

Marius