usb: typec: update partner power delivery support with opmode

If USB PD contract is established after creation of the
partner, the power delivery support attribute of the partner
needs to be updated separately. This can be done in
typec_set_pwr_opmode() by checking if the port has already
partner and updating the value if it does.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/typec.c

@@ -1124,6 +1124,11 @@ void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
 }
 EXPORT_SYMBOL_GPL(typec_set_vconn_role);
 
+static int partner_match(struct device *dev, void *data)
+{
+	return is_typec_partner(dev);
+}
+
 /**
  * typec_set_pwr_opmode - Report changed power operation mode
  * @port: The USB Type-C Port where the mode was changed
@@ -1137,12 +1142,26 @@ EXPORT_SYMBOL_GPL(typec_set_vconn_role);
 void typec_set_pwr_opmode(struct typec_port *port,
 			  enum typec_pwr_opmode opmode)
 {
+	struct device *partner_dev;
+
 	if (port->pwr_opmode == opmode)
 		return;
 
 	port->pwr_opmode = opmode;
 	sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
+
+	partner_dev = device_find_child(&port->dev, NULL, partner_match);
+	if (partner_dev) {
+		struct typec_partner *partner = to_typec_partner(partner_dev);
+
+		if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
+			partner->usb_pd = 1;
+			sysfs_notify(&partner_dev->kobj, NULL,
+				     "supports_usb_power_delivery");
+		}
+		put_device(partner_dev);
+	}
 }
 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);