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* [PATCH v3] usb: typec: ucsi: Get connector status after enable notifications
@ 2025-11-21 12:33 Hsin-Te Yuan
  2025-11-24 10:01 ` Heikki Krogerus
  0 siblings, 1 reply; 2+ messages in thread
From: Hsin-Te Yuan @ 2025-11-21 12:33 UTC (permalink / raw)
  To: Heikki Krogerus, Greg Kroah-Hartman; +Cc: linux-usb, linux-kernel, Hsin-Te Yuan

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.

Get the connector status only after enabling the notification for
conenctor change to ensure the status is synced.

Signed-off-by: Hsin-Te Yuan <yuanhsinte@chromium.org>
---
Changes in v3:
- Seperate the status checking part into a new function called
  ucsi_init_port() and call it after enabling the notifications
- Link to v2: https://lore.kernel.org/r/20251118-ucsi-v2-1-d314d50333e2@chromium.org

Changes in v2:
- Remove unnecessary braces.
- Link to v1: https://lore.kernel.org/r/20251117-ucsi-v1-1-1dcbc5ea642b@chromium.org
---
 drivers/usb/typec/ucsi/ucsi.c | 124 +++++++++++++++++++++++-------------------
 1 file changed, 67 insertions(+), 57 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 3f568f790f39b0271667e80816270274b8dd3008..fbda94bfd5ed12ad8cfaedceb47ad15fee271378 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1560,11 +1560,75 @@ static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
 	return NULL;
 }
 
+static void ucsi_init_port(struct ucsi *ucsi)
+{
+	enum usb_role u_role;
+	int ret, i;
+	struct ucsi_connector *con;
+
+	for (i = 0; i < ucsi->cap.num_connectors; i++) {
+		u_role = USB_ROLE_NONE;
+		con = &ucsi->connector[i];
+		/* Get the status */
+		ret = ucsi_get_connector_status(con, false);
+		if (ret) {
+			dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
+			continue;
+		}
+
+		if (ucsi->ops->connector_status)
+			ucsi->ops->connector_status(con);
+
+		switch (UCSI_CONSTAT(con, PARTNER_TYPE)) {
+		case UCSI_CONSTAT_PARTNER_TYPE_UFP:
+		case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
+			u_role = USB_ROLE_HOST;
+			fallthrough;
+		case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
+			typec_set_data_role(con->port, TYPEC_HOST);
+			break;
+		case UCSI_CONSTAT_PARTNER_TYPE_DFP:
+			u_role = USB_ROLE_DEVICE;
+			typec_set_data_role(con->port, TYPEC_DEVICE);
+			break;
+		default:
+			break;
+		}
+
+		/* Check if there is already something connected */
+		if (UCSI_CONSTAT(con, CONNECTED)) {
+			typec_set_pwr_role(con->port, UCSI_CONSTAT(con, PWR_DIR));
+			ucsi_register_partner(con);
+			ucsi_pwr_opmode_change(con);
+			ucsi_port_psy_changed(con);
+			if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
+				ucsi_get_partner_identity(con);
+			if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
+				ucsi_check_cable(con);
+		}
+
+		/* Only notify USB controller if partner supports USB data */
+		if (!(UCSI_CONSTAT(con, PARTNER_FLAG_USB)))
+			u_role = USB_ROLE_NONE;
+
+		ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
+		if (ret)
+			dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n",
+				con->num, u_role);
+
+		if (con->partner && UCSI_CONSTAT(con, PWR_OPMODE) == UCSI_CONSTAT_PWR_OPMODE_PD) {
+			ucsi_register_device_pdos(con);
+			ucsi_get_src_pdos(con);
+			ucsi_check_altmodes(con);
+			ucsi_check_connector_capability(con);
+		}
+	}
+}
+
 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;
 	char *name;
 	int ret;
@@ -1659,62 +1723,6 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 		goto out;
 	}
 
-	/* Get the status */
-	ret = ucsi_get_connector_status(con, false);
-	if (ret) {
-		dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
-		goto out;
-	}
-
-	if (ucsi->ops->connector_status)
-		ucsi->ops->connector_status(con);
-
-	switch (UCSI_CONSTAT(con, PARTNER_TYPE)) {
-	case UCSI_CONSTAT_PARTNER_TYPE_UFP:
-	case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
-		u_role = USB_ROLE_HOST;
-		fallthrough;
-	case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
-		typec_set_data_role(con->port, TYPEC_HOST);
-		break;
-	case UCSI_CONSTAT_PARTNER_TYPE_DFP:
-		u_role = USB_ROLE_DEVICE;
-		typec_set_data_role(con->port, TYPEC_DEVICE);
-		break;
-	default:
-		break;
-	}
-
-	/* Check if there is already something connected */
-	if (UCSI_CONSTAT(con, CONNECTED)) {
-		typec_set_pwr_role(con->port, UCSI_CONSTAT(con, PWR_DIR));
-		ucsi_register_partner(con);
-		ucsi_pwr_opmode_change(con);
-		ucsi_port_psy_changed(con);
-		if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
-			ucsi_get_partner_identity(con);
-		if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
-			ucsi_check_cable(con);
-	}
-
-	/* Only notify USB controller if partner supports USB data */
-	if (!(UCSI_CONSTAT(con, PARTNER_FLAG_USB)))
-		u_role = USB_ROLE_NONE;
-
-	ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
-	if (ret) {
-		dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n",
-			con->num, u_role);
-		ret = 0;
-	}
-
-	if (con->partner && UCSI_CONSTAT(con, PWR_OPMODE) == UCSI_CONSTAT_PWR_OPMODE_PD) {
-		ucsi_register_device_pdos(con);
-		ucsi_get_src_pdos(con);
-		ucsi_check_altmodes(con);
-		ucsi_check_connector_capability(con);
-	}
-
 	trace_ucsi_register_port(con->num, con);
 
 out:
@@ -1833,6 +1841,8 @@ static int ucsi_init(struct ucsi *ucsi)
 	ucsi->connector = connector;
 	ucsi->ntfy = ntfy;
 
+	ucsi_init_port(ucsi);
+
 	mutex_lock(&ucsi->ppm_lock);
 	ret = ucsi->ops->read_cci(ucsi, &cci);
 	mutex_unlock(&ucsi->ppm_lock);

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

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


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2025-11-21 12:33 [PATCH v3] usb: typec: ucsi: Get connector status after enable notifications Hsin-Te Yuan
2025-11-24 10:01 ` Heikki Krogerus

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