From: chunfeng yun <chunfeng.yun@mediatek.com>
To: Mathias Nyman <mathias.nyman@linux.intel.com>
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>
Subject: Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling
Date: Tue, 12 Jan 2016 09:48:24 +0800 [thread overview]
Message-ID: <1452563304.28863.1.camel@mhfsdcap03> (raw)
In-Reply-To: <5693B5C8.6090201@linux.intel.com>
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
>
prev parent reply other threads:[~2016-01-12 1:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-08 1:28 [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by roothubs polling Chunfeng Yun
2016-01-11 14:01 ` Mathias Nyman
2016-01-12 1:48 ` chunfeng yun [this message]
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