Jisheng Zhang f8408e1e54 usb: dwc2: fix hang during suspend if set as peripheral ...

[ Upstream commit 2b94b054ac ]

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 the dwc2_suspend() tries to read the dwc2's reg to check whether
is_device_mode or not, this would result in hang during suspend if dwc2
is configured as peripheral mode.

Fix this hang by bypassing suspend/resume if lowlevel hw isn't
enabled.

Fixes: 09a75e8577 ("usb: dwc2: refactor common low-level hw code to platform.c")
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://patch.msgid.link/20251104002503.17158-3-jszhang@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-12-18 13:55:04 +01:00

..

core_intr.c

…

core.c

…

core.h

…

debug.h

…

debugfs.c

…

drd.c

…

gadget.c

…

hcd_ddma.c

…

hcd_intr.c

…

hcd_queue.c

…

hcd.c

…

hcd.h

…

hw.h

…

Kconfig

…

Makefile

…

params.c

…

pci.c

…

platform.c

usb: dwc2: fix hang during suspend if set as peripheral

2025-12-18 13:55:04 +01:00