linux-kernel - Re: [PATCH] usb: dwc3: gadget: Inform system of suspended state

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Date: Tue, 4 Jun 2024 01:03:13 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Mike Looijmans <mike.looijmans@...ic.nl>
CC: "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc3: gadget: Inform system of suspended state

Hi,

On Mon, Jun 03, 2024, Mike Looijmans wrote:
> When disconnecting the USB cable on an LS1028 device, nothing happens
> in userspace, which keeps thinking everything is still up and running.
> Turns out that the DWC3 controller only sends DWC3_DEVICE_EVENT_SUSPEND
> in that case, and not a DWC3_DEVICE_EVENT_DISCONNECT as one would
> expect. As a result, sysfs attribute "state" remains "configured"
> until something resets it.
> 
> Forward the "suspended" state to sysfs, so that the "state" at least
> changes into "suspended" when one removes the cable, and hence also
> matches the gadget's state when really suspended.

On disconnection, did you see disconnect interrupt? If so, it should
transition to USB_STATE_NOATTACHED. This change doesn't seem to directly
address your issue. Can you provide the driver tracepoints?

Thanks,
Thinh

> 
> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> ---
> 
>  drivers/usb/dwc3/gadget.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 4df2661f6675..99e8ea9db600 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -4343,6 +4343,7 @@ static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
>  	if (!dwc->suspended && next == DWC3_LINK_STATE_U3) {
>  		dwc->suspended = true;
>  		dwc3_suspend_gadget(dwc);
> +		usb_gadget_set_state(dwc->gadget, USB_STATE_SUSPENDED);
>  	}
>  
>  	dwc->link_state = next;
> -- 
> 2.34.1
> 
> 
> Met vriendelijke groet / kind regards,
> 
> Mike Looijmans
> System Expert
> 
> 
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