linux-kernel - RE: [PATCH] usb: xhci: Fix incomplete PM resume operation due to XHCI commmand timeout

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Message-ID: <HE1PR0401MB202897551C7BC82232EBC27FE3940@HE1PR0401MB2028.eurprd04.prod.outlook.com>
Date:	Mon, 11 Apr 2016 03:46:28 +0000
From:	Rajesh Bhagat <rajesh.bhagat@....com>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sriram Dash <sriram.dash@....com>
Subject: RE: [PATCH] usb: xhci: Fix incomplete PM resume operation due to XHCI
 commmand timeout



> -----Original Message-----
> From: Mathias Nyman [mailto:mathias.nyman@...ux.intel.com]
> Sent: Friday, April 01, 2016 4:20 PM
> To: Rajesh Bhagat <rajesh.bhagat@....com>
> Cc: gregkh@...uxfoundation.org; linux-usb@...r.kernel.org; linux-
> kernel@...r.kernel.org; Sriram Dash <sriram.dash@....com>
> Subject: Re: [PATCH] usb: xhci: Fix incomplete PM resume operation due to XHCI
> commmand timeout
> 
> On 01.04.2016 06:55, Rajesh Bhagat wrote:
> 
> >>>
> >>> Please share your opinion on other changes for patch submission as
> >>> well as resume
> >> time.
> >>>
> >
> >>
> >> I think more effort should be put into investigating why this happens in the first
> place.
> >> What is the root cause? why doesn't xhci start properly after resume in this case.
> >>
> > Hello Mathias,
> >
> > I understand your point and would surely debug the root cause of the
> > issue. But implementing the fallback mechanism in SW, if HW does not respond well
> seems to a better solution to me.
> >
> 
> Yes, I'll add something like this, at least the xhci parts to make sure the completions
> are called.
> 

Should I send the patch?

> This is not really a fallback, it's just a better burial for xhci. It will be unusable after
> this.
> 
> -Mathias