linux-kernel - [PATCH 0/2] usb: dwc2: fix hang during suspend or shutdown

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Message-ID: <20251104002503.17158-1-jszhang@kernel.org>
Date: Tue,  4 Nov 2025 08:25:01 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Minas Harutyunyan <hminas@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] usb: dwc2: fix hang during suspend or shutdown

dwc2 on most platforms needs phy controller, clock and power supply.
All of them must be enabled/activated to properly operate. If dwc2
is configured as peripheral mode, then all the above three hardware
resources are disabled at the end of the probe:

	/* Gadget code manages lowlevel hw on its own */
	if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
		dwc2_lowlevel_hw_disable(hsotg);

But both dwc2_driver_shutdown() and dwc2_suspend() tries to access
the dwc2 registers, this would result in hang during suspend or
shutdown if dwc2 is configured as peripheral mode.

This series tries to fix both issues.

Jisheng Zhang (2):
  usb: dwc2: fix hang during shutdown if set as peripheral
  usb: dwc2: fix hang during suspend if set as peripheral

 drivers/usb/dwc2/platform.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

-- 
2.50.0