net: phy: marvell: clear wol event before setting it

If WOL event happened once, the LED[2] interrupt pin will not be
cleared unless we read the CSISR register. If interrupts are in use,
the normal interrupt handling will clear the WOL event. Let's clear the
WOL event before enabling it if !phy_interrupt_is_valid().

Signed-off-by: Jingju Hou <Jingju.Hou@synaptics.com>
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/marvell.c

@@ -1393,6 +1393,15 @@ static int m88e1318_set_wol(struct phy_device *phydev,
 		if (err < 0)
 			goto error;
 
+		/* If WOL event happened once, the LED[2] interrupt pin
+		 * will not be cleared unless we reading the interrupt status
+		 * register. If interrupts are in use, the normal interrupt
+		 * handling will clear the WOL event. Clear the WOL event
+		 * before enabling it if !phy_interrupt_is_valid()
+		 */
+		if (!phy_interrupt_is_valid(phydev))
+			phy_read(phydev, MII_M1011_IEVENT);
+
 		/* Enable the WOL interrupt */
 		err = __phy_modify(phydev, MII_88E1318S_PHY_CSIER, 0,
 				   MII_88E1318S_PHY_CSIER_WOL_EIE);