From f57184a68969c878cef60b4d41e52e951c4463ec Mon Sep 17 00:00:00 2001
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Date: Tue, 16 May 2017 15:26:11 +0300
Subject: [PATCH 06/26] usb: typec: update partner power delivery support with
 opmode
Git-commit: 7ee4ce6e933fbb2e5db2c39977b847704589575e
Patch-mainline: v4.13-rc1
References: FATE#322665, FATE#322666

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>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/typec/typec.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/usb/typec/typec.c b/drivers/usb/typec/typec.c
index db5ee730ad24..1a6822ee1a52 100644
--- a/drivers/usb/typec/typec.c
+++ b/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);
 
-- 
2.12.3