linux-kernel - Re: usb: dwc3: gadget: skip pullup and set

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Date:   Fri, 22 Jan 2021 16:15:40 +0900
From:   Jung Daehwan <dh10.jung@...sung.com>
To:     Wesley Cheng <wcheng@...eaurora.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Daehwan Jung <dh10.jung@...sung.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:DESIGNWARE USB3 DRD IP DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: usb: dwc3: gadget: skip pullup and set_speed after suspend

On Fri, Jan 22, 2021 03:32, Wesley cheng wrote:
> Hi Daehwan,
> 
> If this is an unexpected event where userspace initiates the UDC bind
> sequence, then after the above sequence occurs, the DWC3 device should
> still be able to re-enter runtime suspend after the autosuspend timer
> expires.  Since the cable is disconnected, the dwc->connected flag would
> still be false.  Is this not happening in your situation?
> 
> I'm just trying to understand what issue you're seeing other than the
> momentary transition from runtime suspend (due to cable disconnect)
> -->runtime resume (due to unexpected UDC bind) --> runtime  suspend (due
> to nothing connected).
> 
> Thanks
> Wesley cheng

Hi Wesley,

I don't know why but DWC3 device is not re-entering runtime-suspend in
my situation. I'm still debugging it.
Even if DWC3 re-enter runtime-suspend but it doesn't mean stopping gadget.
Are you stopping gadget manually in this case?

Best Regards,
Jung Daehwan