Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling

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From	chunfeng yun <chunfeng.yun@mediatek.com>
Newsgroups	linux.kernel
Subject	Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling
Date	Tue, 12 Jan 2016 02:50:01 +0100
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X-Original-Cc	Mathias Nyman <mathias.nyman@intel.com>, Matthias Brugger <matthias.bgg@gmail.com>, Felipe Balbi <balbi@ti.com>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-usb@vger.kernel.org>, <linux-mediatek@lists.infradead.org>, Daniel Kurtz <djkurtz@chromium.org>, Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Hi,
On Mon, 2016-01-11 at 16:01 +0200, Mathias Nyman wrote:
> 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 <chunfeng.yun@mediatek.com>
> > ---
> >   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
> 
Thank you!

> -Mathias
>

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[RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling Chunfeng Yun <chunfeng.yun@mediatek.com> - 2016-01-08 02:30 +0100
  Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by  roothubs polling Mathias Nyman <mathias.nyman@linux.intel.com> - 2016-01-11 15:00 +0100
    Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by  roothubs polling chunfeng yun <chunfeng.yun@mediatek.com> - 2016-01-12 02:50 +0100

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