linux-kernel - [PATCH] usb: musb: fix gadget state on disconnect

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Message-Id: <20250624140930.25887-1-drew.hamilton@zetier.com>
Date: Tue, 24 Jun 2025 10:09:30 -0400
From: Drew Hamilton <drew.hamilton@...ier.com>
To: Bin Liu <b-liu@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Drew Hamilton <drew.hamilton@...ier.com>,
	Yehowshua Immanuel <yehowshua.immanuel@...sixtech.com>
Subject: [PATCH] usb: musb: fix gadget state on disconnect

When unplugging the USB cable or disconnecting a gadget in usb peripheral mode with
echo "" > /sys/kernel/config/usb_gadget/<your_gadget>/UDC,
/sys/class/udc/musb-hdrc.0/state does not change from USB_STATE_CONFIGURED.

Testing on dwc2/3 shows they both update the state to USB_STATE_NOTATTACHED.

Add calls to usb_gadget_set_state in musb_g_disconnect and musb_gadget_stop
to fix both cases.

Tested against 82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3.

Co-authored-by: Yehowshua Immanuel <yehowshua.immanuel@...sixtech.com>
Signed-off-by: Yehowshua Immanuel <yehowshua.immanuel@...sixtech.com>
Signed-off-by: Drew Hamilton <drew.hamilton@...ier.com>
---
 drivers/usb/musb/musb_gadget.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 6869c58367f2..caf4d4cd4b75 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1913,6 +1913,7 @@ static int musb_gadget_stop(struct usb_gadget *g)
 	 * gadget driver here and have everything work;
 	 * that currently misbehaves.
 	 */
+	usb_gadget_set_state(g, USB_STATE_NOTATTACHED);
 
 	/* Force check of devctl register for PM runtime */
 	pm_runtime_mark_last_busy(musb->controller);
@@ -2019,6 +2020,7 @@ void musb_g_disconnect(struct musb *musb)
 	case OTG_STATE_B_PERIPHERAL:
 	case OTG_STATE_B_IDLE:
 		musb_set_state(musb, OTG_STATE_B_IDLE);
+		usb_gadget_set_state(&musb->g, USB_STATE_NOTATTACHED);
 		break;
 	case OTG_STATE_B_SRP_INIT:
 		break;
-- 
2.34.1