From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: Mon, 6 Jan 2020 03:34:12 +0200
Subject: net: dsa: Pass pcs_poll flag from driver to PHYLINK

Git-commit: 787cac3f5a650fd3184a41c5a27a2fe9ded833aa
Patch-mainline: v5.6-rc1
References: jsc#SLE-9263

The DSA drivers that implement .phylink_mac_link_state should normally
register an interrupt for the PCS, from which they should call
phylink_mac_change(). However not all switches implement this, and those
who don't should set this flag in dsa_switch in the .setup callback, so
that PHYLINK will poll for a few ms until the in-band AN link timer
expires and the PCS state settles.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 include/net/dsa.h |    5 +++++
 net/dsa/port.c    |    1 +
 2 files changed, 6 insertions(+)

--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -275,6 +275,11 @@ struct dsa_switch {
 	 */
 	bool			vlan_filtering;
 
+	/* MAC PCS does not provide link state change interrupt, and requires
+	 * polling. Flag passed on to PHYLINK.
+	 */
+	bool			pcs_poll;
+
 	unsigned long		*bitmap;
 	unsigned long		_bitmap;
 
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -612,6 +612,7 @@ static int dsa_port_phylink_register(str
 
 	dp->pl_config.dev = ds->dev;
 	dp->pl_config.type = PHYLINK_DEV;
+	dp->pl_config.pcs_poll = ds->pcs_poll;
 
 	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
 				mode, &dsa_port_phylink_mac_ops);