Revert "net: usb: asix: ax88772: drop phylink use in PM to avoid MDIO runtime PM wakeups"

This reverts commit 5537a46 ("net: usb: asix: ax88772: drop
phylink use in PM to avoid MDIO runtime PM wakeups"), it breaks
operation of asix ethernet usb dongle after system suspend-resume
cycle.

Link: https://lore.kernel.org/all/[email protected]/
Fixes: 5537a46 ("net: usb: asix: ax88772: drop phylink use in PM to avoid MDIO runtime PM wakeups")
Reported-by: Marek Szyprowski <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
Link: https://patch.msgid.link/2945b9dbadb8ee1fee058b19554a5cb14f1763c1.1757601118.git.pabeni@redhat.com
Signed-off-by: Paolo Abeni <[email protected]>

Author: Paolo Abeni

drivers/net/usb/asix_devices.c

@@ -607,8 +607,15 @@ static const struct net_device_ops ax88772_netdev_ops = {
 
 static void ax88772_suspend(struct usbnet *dev)
 {
+	struct asix_common_private *priv = dev->driver_priv;
 	u16 medium;
 
+	if (netif_running(dev->net)) {
+		rtnl_lock();
+		phylink_suspend(priv->phylink, false);
+		rtnl_unlock();
+	}
+
 	/* Stop MAC operation */
 	medium = asix_read_medium_status(dev, 1);
 	medium &= ~AX_MEDIUM_RE;
@@ -637,6 +644,12 @@ static void ax88772_resume(struct usbnet *dev)
 	for (i = 0; i < 3; i++)
 		if (!priv->reset(dev, 1))
 			break;
+
+	if (netif_running(dev->net)) {
+		rtnl_lock();
+		phylink_resume(priv->phylink);
+		rtnl_unlock();
+	}
 }
 
 static int asix_resume(struct usb_interface *intf)