net: arc_emac: switch to phy_start()/phy_stop()

Currently driver use phy_start_aneg() in arc_emac_open() to bring
up PHY. But phy_start() function is more appropriate for this purposes.
Besides that it call phy_start_aneg() as part of PHY startup sequence
it also can correctly bring up PHY from error and suspended states.
So the patch replace phy_start_aneg() to phy_start().

Also the patch add call to phy_stop() to arc_emac_stop() to allow
the PHY device to be fully suspended when the interface is unused.
Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/arc/emac_main.c

@@ -434,7 +434,7 @@ static int arc_emac_open(struct net_device *ndev)
 	/* Enable EMAC */
 	arc_reg_or(priv, R_CTRL, EN_MASK);
 
-	phy_start_aneg(ndev->phydev);
+	phy_start(ndev->phydev);
 
 	netif_start_queue(ndev);
 
@@ -556,6 +556,8 @@ static int arc_emac_stop(struct net_device *ndev)
 	napi_disable(&priv->napi);
 	netif_stop_queue(ndev);
 
+	phy_stop(ndev->phydev);
+
 	/* Disable interrupts */
 	arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);