net: dsa: qca8k: enable port flow control

Set phy device advertising to enable MAC flow control.
Signed-off-by: NXiaofei Shen <xiaofeis@codeaurora.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/qca8k.c

@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2009 Felix Fietkau <nbd@nbd.name>
  * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015, 2019, The Linux Foundation. All rights reserved.
  * Copyright (c) 2016 John Crispin <john@phrozen.org>
  */
 
@@ -935,6 +935,8 @@ qca8k_port_enable(struct dsa_switch *ds, int port,
 	qca8k_port_set_status(priv, port, 1);
 	priv->port_sts[port].enabled = 1;
 
+	phy_support_asym_pause(phy);
+
 	return 0;
 }