2017-11-08 01:19:13

by Alan Stern

[permalink] [raw]
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


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