From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933201AbcAKN4S (ORCPT ); Mon, 11 Jan 2016 08:56:18 -0500 Received: from mga11.intel.com ([192.55.52.93]:59664 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932991AbcAKN4P (ORCPT ); Mon, 11 Jan 2016 08:56:15 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,553,1444719600"; d="scan'208";a="890813430" Message-ID: <5693B5C8.6090201@linux.intel.com> Date: Mon, 11 Jan 2016 16:01:44 +0200 From: Mathias Nyman User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 MIME-Version: 1.0 To: Chunfeng Yun , Mathias Nyman 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 Subject: Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling References: <1452216517-3765-1-git-send-email-chunfeng.yun@mediatek.com> In-Reply-To: <1452216517-3765-1-git-send-email-chunfeng.yun@mediatek.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08.01.2016 03:28, Chunfeng Yun wrote: > when ip fails to enter sleep mode, register access protection will > be disabled, at the same time if all clocks are disabled, access > register will hang up AHB bus. > the common case causes ip sleep failure is that after all ports > enter U3 but before ip enters sleep mode, a port receives a resume > signal('K'). this will happens when such as clicks mouse to try to > do remote-wakeup to stop system enter suspend. > so stop polling root hubs to avoid access xHCI register on bus > suspend, and restart it when bus resumes. > > Signed-off-by: Chunfeng Yun > --- > drivers/usb/host/xhci-mtk.c | 23 +++++++++++++++++++++++ The xhci Mediatek (xhci-mtk etc) support is in usb-next and should be available first time in 4.5-rc1 kernel. I'll forward fixes for it once 4.5-rc1 is out, they should end up in final 4.5 -Mathias