linux-kernel - Re: Suspend to disk with usb connected fails to detect usb(reset) during resume

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Date:   Tue, 7 Nov 2017 10:49:36 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Ivid Suvarna <ivid.suvarna@...il.com>
cc:     USB list <linux-usb@...r.kernel.org>, <balbi@...nel.org>,
        <gregkh@...uxfoundation.org>, <billyaraujo@...il.com>,
        <johnyoun@...opsys.com>, <dinguyen@...nel.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Kernel development list <linux-kernel@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Oliver Neukum <oneukum@...e.com>,
        Johan Hovold <johan@...nel.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Vincent Pelletier <plr.vincent@...il.com>,
        Jerry Zhang <zhangjerry@...gle.com>,
        John Keeping <john@...anate.com>,
        Krzysztof Opasiak <k.opasiak@...sung.com>,
        Abdulhadi Mohamed <abdulahhadi2@...il.com>,
        Matthew Wilcox <willy@...ux.intel.com>,
        Janusz Dziedzic <januszx.dziedzic@...ux.intel.com>
Subject: Re: Suspend to disk with usb connected fails to detect usb(reset)
 during resume

On Tue, 7 Nov 2017, Ivid Suvarna wrote:

> Hi,
> 
> I am trying to support suspend to disk(hibernate) on Hikey with 4.4
> kernel. During suspend, I could see the usb devices getting reset and I
> can access them properly. Message can be seen as below:
> 
> usb 1-1: reset high-speed USB device number 2 using dwc2
> usb 1-1.2: reset high-speed USB device number 3 using dwc2
> usb 1-1.2.4: reset high-speed USB device number 4 using dwc2

You might start by asking why the devices need to be reset during 
suspend.  I can't see any reason for doing this.

Alan Stern