net: phy: dp83867: Disable IRQs on suspend

Before putting the PHY into IEEE power down mode, disable IRQs to
prevent accessing the PHY once MDIO has already been shutdown.
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20230310074500.3472858-1-alexander.stein@ew.tq-group.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/dp83867.c

@@ -693,6 +693,30 @@ static int dp83867_of_init(struct phy_device *phydev)
 }
 #endif /* CONFIG_OF_MDIO */
 
+static int dp83867_suspend(struct phy_device *phydev)
+{
+	/* Disable PHY Interrupts */
+	if (phy_interrupt_is_valid(phydev)) {
+		phydev->interrupts = PHY_INTERRUPT_DISABLED;
+		dp83867_config_intr(phydev);
+	}
+
+	return genphy_suspend(phydev);
+}
+
+static int dp83867_resume(struct phy_device *phydev)
+{
+	/* Enable PHY Interrupts */
+	if (phy_interrupt_is_valid(phydev)) {
+		phydev->interrupts = PHY_INTERRUPT_ENABLED;
+		dp83867_config_intr(phydev);
+	}
+
+	genphy_resume(phydev);
+
+	return 0;
+}
+
 static int dp83867_probe(struct phy_device *phydev)
 {
 	struct dp83867_private *dp83867;
@@ -968,8 +992,8 @@ static struct phy_driver dp83867_driver[] = {
 		.config_intr	= dp83867_config_intr,
 		.handle_interrupt = dp83867_handle_interrupt,
 
-		.suspend	= genphy_suspend,
-		.resume		= genphy_resume,
+		.suspend	= dp83867_suspend,
+		.resume		= dp83867_resume,
 
 		.link_change_notify = dp83867_link_change_notify,
 		.set_loopback	= dp83867_loopback,