Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 7 Nov 2017 10:49:36 -0500 (EST)
From:   Alan Stern <stern@rowland.harvard.edu>
To:     Ivid Suvarna <ivid.suvarna@gmail.com>
cc:     USB list <linux-usb@vger.kernel.org>, <balbi@kernel.org>,
        <gregkh@linuxfoundation.org>, <billyaraujo@gmail.com>,
        <johnyoun@synopsys.com>, <dinguyen@kernel.org>,
        Felipe Balbi <felipe.balbi@linux.intel.com>,
        Kernel development list <linux-kernel@vger.kernel.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Oliver Neukum <oneukum@suse.com>,
        Johan Hovold <johan@kernel.org>,
        Michal Nazarewicz <mina86@mina86.com>,
        Vincent Pelletier <plr.vincent@gmail.com>,
        Jerry Zhang <zhangjerry@google.com>,
        John Keeping <john@metanate.com>,
        Krzysztof Opasiak <k.opasiak@samsung.com>,
        Abdulhadi Mohamed <abdulahhadi2@gmail.com>,
        Matthew Wilcox <willy@linux.intel.com>,
        Janusz Dziedzic <januszx.dziedzic@linux.intel.com>
Subject: Re: Suspend to disk with usb connected fails to detect usb(reset)
 during resume
In-Reply-To: <CABXF_ABR4XbUqOmmxwZGZUAqmJ=e_aUYa=4oMn653tWyZxvYBA@mail.gmail.com>
Message-ID: <Pine.LNX.4.44L0.1711071047300.1395-100000@iolanthe.rowland.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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


From 1583404602764038965@xxx Tue Nov 07 10:58:22 +0000 2017
X-GM-THRID: 1583404602764038965
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread