linux-kernel - [PATCH] usb: typec: ucsi: Monitor connector change before getting connector status

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Message-Id: <20251117-ucsi-v1-1-1dcbc5ea642b@chromium.org>
Date: Mon, 17 Nov 2025 17:31:43 +0800
From: Hsin-Te Yuan <yuanhsinte@...omium.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Hsin-Te Yuan <yuanhsinte@...omium.org>
Subject: [PATCH] usb: typec: ucsi: Monitor connector change before getting
 connector status

Originally, the notification for connector change will be enabled after
the first read of the connector status. Therefore, if the event happens
during this window, it will be missing and make the status unsynced.

Enable the notification for connector change before getting the
connector status to ensure the status is synced.

Signed-off-by: Hsin-Te Yuan <yuanhsinte@...omium.org>
---
 drivers/usb/typec/ucsi/ucsi.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 3f568f790f39b0271667e80816270274b8dd3008..07290cd85b618b22cb989151079707dbe9f578a7 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1565,7 +1565,7 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 	struct typec_capability *cap = &con->typec_cap;
 	enum typec_accessory *accessory = cap->accessory;
 	enum usb_role u_role = USB_ROLE_NONE;
-	u64 command;
+	u64 command, ntfy;
 	char *name;
 	int ret;
 
@@ -1659,6 +1659,15 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 		goto out;
 	}
 
+	/* Enable the notification for connector change before getting the connector status */
+	ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR | UCSI_ENABLE_NTFY_CONNECTOR_CHANGE;
+	command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
+	ret = ucsi_send_command(ucsi, command, NULL, 0);
+	if (ret < 0) {
+		dev_warn(ucsi->dev, "con%d: failed to enable the notification for connector change\n",
+			 con->num);
+	}
+
 	/* Get the status */
 	ret = ucsi_get_connector_status(con, false);
 	if (ret) {

---
base-commit: 6a23ae0a96a600d1d12557add110e0bb6e32730c
change-id: 20251117-ucsi-c2dfe8c006d7

Best regards,
-- 
Hsin-Te Yuan <yuanhsinte@...omium.org>