From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathias Nyman Subject: Re: [PATCH] usb: xhci: fix config fail of FS hub behind a HS hub with MTT Date: Fri, 04 Dec 2015 14:06:30 +0200 Message-ID: <566181C6.6090107@intel.com> References: <1449123254-21654-1-git-send-email-chunfeng.yun@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1449123254-21654-1-git-send-email-chunfeng.yun@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org To: Chunfeng Yun Cc: Matthias Brugger , Felipe Balbi , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, linux-mediatek@lists.infradead.org, Daniel Kurtz , Sergei Shtylyov , Greg Kroah-Hartman List-Id: linux-mediatek@lists.infradead.org On 03.12.2015 08:14, Chunfeng Yun wrote: > if a full speed hub connects to a high speed hub which > supports MTT, the MTT field of its slot context will be set > to 1 when xHCI driver setups an xHCI virtual device in > xhci_setup_addressable_virt_dev(); once usb core fetch its > hub descriptor, and need to update the xHC's internal data > structures for the device, the HUB field of its slot context > will be set to 1 too, meanwhile MTT is also set before, > this will cause configure endpoint command fail, so in the > case, we should clear MTT to 0 for full speed hub according > to section 6.2.2 > > Signed-off-by: Chunfeng Yun > --- Thanks, patch added to queue -Mathias