From mboxrd@z Thu Jan 1 00:00:00 1970 From: mathias.nyman@linux.intel.com (Mathias Nyman) Date: Mon, 11 Jan 2016 16:01:44 +0200 Subject: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling In-Reply-To: <1452216517-3765-1-git-send-email-chunfeng.yun@mediatek.com> References: <1452216517-3765-1-git-send-email-chunfeng.yun@mediatek.com> Message-ID: <5693B5C8.6090201@linux.intel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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