linux-kernel - dwc3 gadget: controller stop times out on system sleep

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Date:   Wed, 26 Apr 2023 19:17:22 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: dwc3 gadget: controller stop times out on system sleep

Hi Thinh,

On Linux kernel v6.3
Test procedure: 

- modprobe g_zero
- Connect to PC host
- systemctl suspend

A large delay of 3 seconds is observed. The delay comes from dwc3_gadget_suspend()->dwc3_gadget_run_stop() waiting for DWC3_DSTS_DEVCTRLHLT to be set.
It returns -ETIMEDOUT.

Are we missing something to do a clean stop during suspend?

FYI. Unloading g_zero does not show this delay on stop.

cheers,
-roger