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