Revert "net: phy: Avoid polling PHY with PHY_IGNORE_INTERRUPTS"

BugLink: https://bugs.launchpad.net/bugs/1881356

This reverts commit 0d1951fa23ba0d35a4c5498ff28d1c5206d6fcdd which was
commit d5c3d846 upstream.

Guillaume reports that this patch breaks booting on
at91-sama5d4_xplained, so revert it for now.
Reported-by: "kernelci.org bot" <bot@kernelci.org>
Reported-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

drivers/net/phy/phy.c

@@ -918,10 +918,10 @@ void phy_state_machine(struct work_struct *work)
 		phydev->adjust_link(phydev->attached_dev);
 		break;
 	case PHY_RUNNING:
-		/* Only register a CHANGE if we are polling and link changed
-		 * since latest checking.
+		/* Only register a CHANGE if we are polling or ignoring
+		 * interrupts and link changed since latest checking.
 		 */
-		if (phydev->irq == PHY_POLL) {
+		if (!phy_interrupt_is_valid(phydev)) {
 			old_link = phydev->link;
 			err = phy_read_status(phydev);
 			if (err)
@@ -1021,11 +1021,6 @@ void phy_state_machine(struct work_struct *work)
 	dev_dbg(&phydev->dev, "PHY state change %s -> %s\n",
 		phy_state_to_str(old_state), phy_state_to_str(phydev->state));
 
-	/* Only re-schedule a PHY state machine change if we are polling the
-	 * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
-	 * between states from phy_mac_interrupt()
-	 */
-	if (phydev->irq == PHY_POLL)
 	queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
 			   PHY_STATE_TIME * HZ);
 }