From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Sun, 12 Feb 2017 17:27:17 +0100
Subject: [PATCH] phy: provide a hook for link up/link down events

Sometimes, we need to do additional work between the PHY coming up and
marking the carrier present - for example, we may need to wait for the
PHY to MAC link to finish negotiation.  This changes phylib to provide
a notification function pointer which avoids the built-in
netif_carrier_on() and netif_carrier_off() functions.

Standard ->adjust_link functionality is provided by hooking a helper
into the new ->phy_link_change method.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -991,6 +991,16 @@ void phy_start(struct phy_device *phydev
 }
 EXPORT_SYMBOL(phy_start);
 
+static void phy_link_up(struct phy_device *phydev)
+{
+	phydev->phy_link_change(phydev, true, true);
+}
+
+static void phy_link_down(struct phy_device *phydev, bool do_carrier)
+{
+	phydev->phy_link_change(phydev, false, do_carrier);
+}
+
 /**
  * phy_state_machine - Handle the state machine
  * @work: work_struct that describes the work to be done
@@ -1032,8 +1042,7 @@ void phy_state_machine(struct work_struc
 		/* If the link is down, give up on negotiation for now */
 		if (!phydev->link) {
 			phydev->state = PHY_NOLINK;
-			netif_carrier_off(phydev->attached_dev);
-			phydev->adjust_link(phydev->attached_dev);
+			phy_link_down(phydev, true);
 			break;
 		}
 
@@ -1045,9 +1054,7 @@ void phy_state_machine(struct work_struc
 		/* If AN is done, we're running */
 		if (err > 0) {
 			phydev->state = PHY_RUNNING;
-			netif_carrier_on(phydev->attached_dev);
-			phydev->adjust_link(phydev->attached_dev);
-
+			phy_link_up(phydev);
 		} else if (0 == phydev->link_timeout--)
 			needs_aneg = true;
 		break;
@@ -1072,8 +1079,7 @@ void phy_state_machine(struct work_struc
 				}
 			}
 			phydev->state = PHY_RUNNING;
-			netif_carrier_on(phydev->attached_dev);
-			phydev->adjust_link(phydev->attached_dev);
+			phy_link_up(phydev);
 		}
 		break;
 	case PHY_FORCING:
@@ -1083,13 +1089,12 @@ void phy_state_machine(struct work_struc
 
 		if (phydev->link) {
 			phydev->state = PHY_RUNNING;
-			netif_carrier_on(phydev->attached_dev);
+			phy_link_up(phydev);
 		} else {
 			if (0 == phydev->link_timeout--)
 				needs_aneg = true;
+			phy_link_down(phydev, false);
 		}
-
-		phydev->adjust_link(phydev->attached_dev);
 		break;
 	case PHY_RUNNING:
 		/* Only register a CHANGE if we are polling and link changed
@@ -1121,14 +1126,12 @@ void phy_state_machine(struct work_struc
 
 		if (phydev->link) {
 			phydev->state = PHY_RUNNING;
-			netif_carrier_on(phydev->attached_dev);
+			phy_link_up(phydev);
 		} else {
 			phydev->state = PHY_NOLINK;
-			netif_carrier_off(phydev->attached_dev);
+			phy_link_down(phydev, true);
 		}
 
-		phydev->adjust_link(phydev->attached_dev);
-
 		if (phy_interrupt_is_valid(phydev))
 			err = phy_config_interrupt(phydev,
 						   PHY_INTERRUPT_ENABLED);
@@ -1136,8 +1139,7 @@ void phy_state_machine(struct work_struc
 	case PHY_HALTED:
 		if (phydev->link) {
 			phydev->link = 0;
-			netif_carrier_off(phydev->attached_dev);
-			phydev->adjust_link(phydev->attached_dev);
+			phy_link_down(phydev, true);
 			do_suspend = true;
 		}
 		break;
@@ -1157,11 +1159,11 @@ void phy_state_machine(struct work_struc
 
 				if (phydev->link) {
 					phydev->state = PHY_RUNNING;
-					netif_carrier_on(phydev->attached_dev);
+					phy_link_up(phydev);
 				} else	{
 					phydev->state = PHY_NOLINK;
+					phy_link_down(phydev, false);
 				}
-				phydev->adjust_link(phydev->attached_dev);
 			} else {
 				phydev->state = PHY_AN;
 				phydev->link_timeout = PHY_AN_TIMEOUT;
@@ -1173,11 +1175,11 @@ void phy_state_machine(struct work_struc
 
 			if (phydev->link) {
 				phydev->state = PHY_RUNNING;
-				netif_carrier_on(phydev->attached_dev);
+				phy_link_up(phydev);
 			} else	{
 				phydev->state = PHY_NOLINK;
+				phy_link_down(phydev, false);
 			}
-			phydev->adjust_link(phydev->attached_dev);
 		}
 		break;
 	}
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -645,6 +645,19 @@ struct phy_device *phy_find_first(struct
 }
 EXPORT_SYMBOL(phy_find_first);
 
+static void phy_link_change(struct phy_device *phydev, bool up, bool do_carrier)
+{
+	struct net_device *netdev = phydev->attached_dev;
+
+	if (do_carrier) {
+		if (up)
+			netif_carrier_on(netdev);
+		else
+			netif_carrier_off(netdev);
+	}
+	phydev->adjust_link(netdev);
+}
+
 /**
  * phy_prepare_link - prepares the PHY layer to monitor link status
  * @phydev: target phy_device struct
@@ -910,6 +923,7 @@ int phy_attach_direct(struct net_device
 		goto error;
 	}
 
+	phydev->phy_link_change = phy_link_change;
 	phydev->attached_dev = dev;
 	dev->phydev = phydev;
 
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -425,6 +425,7 @@ struct phy_device {
 
 	u8 mdix;
 
+	void (*phy_link_change)(struct phy_device *, bool up, bool do_carrier);
 	void (*adjust_link)(struct net_device *dev);
 };
 #define to_phy_device(d) container_of(to_mdio_device(d), \