[PATCH 6.1.y] usb: dwc3: keep susphy enabled during exit to avoid controller faults

[Sasha Levin <sashal@kernel.org>]

From: Udipto Goswami <udipto.goswami@oss.qualcomm.com>

[ Upstream commit e1003aa7ec9eccdde4c926bd64ef42816ad55f25 ]

On some platforms, switching USB roles from host to device can trigger
controller faults due to premature PHY power-down. This occurs when the
PHY is disabled too early during teardown, causing synchronization
issues between the PHY and controller.

Keep susphy enabled during dwc3_host_exit() and dwc3_gadget_exit()
ensures the PHY remains in a low-power state capable of handling
required commands during role switch.

Cc: stable <stable@kernel.org>
Fixes: 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init")
Suggested-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Udipto Goswami <udipto.goswami@oss.qualcomm.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://patch.msgid.link/20251126054221.120638-1-udipto.goswami@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Adjust context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/dwc3/gadget.c | 2 +-
 drivers/usb/dwc3/host.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 4ccda324966e..42dca9a70f7d 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4646,7 +4646,7 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 	if (!dwc->gadget)
 		return;
 
-	dwc3_enable_susphy(dwc, false);
+	dwc3_enable_susphy(dwc, true);
 	usb_del_gadget(dwc->gadget);
 	dwc3_gadget_free_endpoints(dwc);
 	usb_put_gadget(dwc->gadget);
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index c0dba453f1b8..5a5e51f6148b 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -162,7 +162,7 @@ int dwc3_host_init(struct dwc3 *dwc)
 
 void dwc3_host_exit(struct dwc3 *dwc)
 {
-	dwc3_enable_susphy(dwc, false);
+	dwc3_enable_susphy(dwc, true);
 	platform_device_unregister(dwc->xhci);
 	dwc->xhci = NULL;
 }
-- 
2.51.0