[PATCH net-next V1 3/4] net: stmmac: Reconfigure the PHY WOL settings in stmmac_resume()

[Ling Pei Lee]

From: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli at intel.com>

After PHY received a magic packet, the PHY WOL event will be
triggered then PHY WOL event interrupt will be disarmed.
Ethtool settings will remain with WOL enabled after a S3/S4
suspend resume cycle as expected. Hence,the driver should
reconfigure the PHY settings to reenable/disable WOL
depending on the ethtool WOL settings in the resume flow.

Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli at intel.com>
Co-developed-by: Ling Pei Lee <pei.lee.ling at intel.com>
Signed-off-by: Ling Pei Lee <pei.lee.ling at intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index a3b79ddcf08e..cd96e4d7a22e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7246,6 +7246,16 @@ int stmmac_resume(struct device *dev)
 		phylink_start(priv->phylink);
 		/* We may have called phylink_speed_down before */
 		phylink_speed_up(priv->phylink);
+		/* Reconfigure PHY WOL if the WOL is enabled in ethtool,
+		 * so that subsequent WOL still can be triggered.
+		 */
+		if (!priv->plat->pmt) {
+			struct ethtool_wolinfo phy_wol = { .cmd = ETHTOOL_GWOL };
+
+			phylink_ethtool_get_wol(priv->phylink, &phy_wol);
+			if (phy_wol.wolopts)
+				phylink_ethtool_set_wol(priv->phylink, &phy_wol);
+		}
 		rtnl_unlock();
 	}
 
-- 
2.25.1