usb: typec: ucsi: Always set number of alternate modes

[ Upstream commit c313a44 ]

Providing the number of known alternate modes allows user space to
determine when device registration has completed. Always register a
number of known alternate modes for the partner and cable plug, even
when the number of supported alternate modes is 0.

Reviewed-by: Heikki Krogerus <[email protected]>
Reviewed-by: Benson Leung <[email protected]>
Signed-off-by: Jameson Thies <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Stable-dep-of: 87eb3cb ("usb: typec: ucsi: Fix cable registration")
Signed-off-by: Sasha Levin <[email protected]>

drivers/usb/typec/ucsi/ucsi.c

@@ -817,10 +817,11 @@ static int ucsi_check_altmodes(struct ucsi_connector *con)
 	/* Ignoring the errors in this case. */
 	if (con->partner_altmode[0]) {
 		num_partner_am = ucsi_get_num_altmode(con->partner_altmode);
-		if (num_partner_am > 0)
-			typec_partner_set_num_altmodes(con->partner, num_partner_am);
+		typec_partner_set_num_altmodes(con->partner, num_partner_am);
 		ucsi_altmode_update_active(con);
 		return 0;
+	} else {
+		typec_partner_set_num_altmodes(con->partner, 0);
 	}
 
 	return ret;
@@ -1143,7 +1144,7 @@ static int ucsi_check_connection(struct ucsi_connector *con)
 static int ucsi_check_cable(struct ucsi_connector *con)
 {
 	u64 command;
-	int ret;
+	int ret, num_plug_am;
 
 	if (con->cable)
 		return 0;
@@ -1177,6 +1178,13 @@ static int ucsi_check_cable(struct ucsi_connector *con)
 			return ret;
 	}
 
+	if (con->plug_altmode[0]) {
+		num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
+		typec_plug_set_num_altmodes(con->plug, num_plug_am);
+	} else {
+		typec_plug_set_num_altmodes(con->plug, 0);
+	}
+
 	return 0;
 }