Date: Tue, 3 Mar 2015 12:01:04 +0100 From: Marius Strobl <marius@alchemy.franken.de> To: Hans Petter Selasky <hselasky@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r279563 - head/sys/dev/usb/controller Message-ID: <20150303110104.GA65391@alchemy.franken.de> In-Reply-To: <201503031021.t23ALtIK094082@svn.freebsd.org> References: <201503031021.t23ALtIK094082@svn.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20150303110104.GA65391>