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

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Message-ID: <5693B5C8.6090201@linux.intel.com>
Date:	Mon, 11 Jan 2016 16:01:44 +0200
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	Mathias Nyman <mathias.nyman@...el.com>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	Daniel Kurtz <djkurtz@...omium.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RESEND PATCH v2] usb: xhci-mtk: fix AHB bus hang up caused by
 roothubs polling

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@...iatek.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

-Mathias