usb: typec: ucsi: Only enable supported notifications

The UCSI specification defines some notifications to be optional for the
PPM to support. From these only enable the ones the PPM informs us are
actually supported.
Signed-off-by: Diogo Ivo <diogo.ivo@tecnico.ulisboa.pt>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/yhz7nq622mbg3rqsyvqz632pc756niagpfbnzayfswhzo7esho@vrdtx5c3hjgxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/ucsi/ucsi.c

@@ -1672,6 +1672,27 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 	return ret;
 }
 
+static u64 ucsi_get_supported_notifications(struct ucsi *ucsi)
+{
+	u8 features = ucsi->cap.features;
+	u64 ntfy = UCSI_ENABLE_NTFY_ALL;
+
+	if (!(features & UCSI_CAP_ALT_MODE_DETAILS))
+		ntfy &= ~UCSI_ENABLE_NTFY_CAM_CHANGE;
+
+	if (!(features & UCSI_CAP_PDO_DETAILS))
+		ntfy &= ~(UCSI_ENABLE_NTFY_PWR_LEVEL_CHANGE |
+			  UCSI_ENABLE_NTFY_CAP_CHANGE);
+
+	if (!(features & UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS))
+		ntfy &= ~UCSI_ENABLE_NTFY_EXT_PWR_SRC_CHANGE;
+
+	if (!(features & UCSI_CAP_PD_RESET))
+		ntfy &= ~UCSI_ENABLE_NTFY_PD_RESET_COMPLETE;
+
+	return ntfy;
+}
+
 /**
  * ucsi_init - Initialize UCSI interface
  * @ucsi: UCSI to be initialized
@@ -1726,8 +1747,8 @@ static int ucsi_init(struct ucsi *ucsi)
 			goto err_unregister;
 	}
 
-	/* Enable all notifications */
-	ntfy = UCSI_ENABLE_NTFY_ALL;
+	/* Enable all supported notifications */
+	ntfy = ucsi_get_supported_notifications(ucsi);
 	command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
 	ret = ucsi_send_command(ucsi, command, NULL, 0);
 	if (ret < 0)