FAILED: patch "[PATCH] usb: dwc3: keep susphy enabled during exit to avoid" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x e1003aa7ec9eccdde4c926bd64ef42816ad55f25
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025122911-punctual-slapping-497e@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e1003aa7ec9eccdde4c926bd64ef42816ad55f25 Mon Sep 17 00:00:00 2001
From: Udipto Goswami <udipto.goswami@oss.qualcomm.com>
Date: Wed, 26 Nov 2025 11:12:21 +0530
Subject: [PATCH] usb: dwc3: keep susphy enabled during exit to avoid
 controller faults

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>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index bc3fe31638b9..8a35a6901db7 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4826,7 +4826,7 @@ 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 cf6512ed17a6..96b588bd08cd 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -227,7 +227,7 @@ void dwc3_host_exit(struct dwc3 *dwc)
 	if (dwc->sys_wakeup)
 		device_init_wakeup(&dwc->xhci->dev, false);
 
-	dwc3_enable_susphy(dwc, false);
+	dwc3_enable_susphy(dwc, true);
 	platform_device_unregister(dwc->xhci);
 	dwc->xhci = NULL;
 }