net: bcmgenet: suspend and resume from Wake-on-LAN

Update bcmgenet_suspend() to prepare the hardware for being put into
Wake-on-LAN mode if the device can wakeup the system, and Wake-on-LAN is
enabled. Whether we resume from Wake-on-LAN or not, make sure that
bcmgenet_resume() disables the UniMAC MagicPacket matching mode and puts
the hardware in a state where it can receive all incoming packets.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/genet/bcmgenet.c

@@ -2635,6 +2635,12 @@ static int bcmgenet_suspend(struct device *d)
 	bcmgenet_tx_reclaim_all(dev);
 	bcmgenet_fini_dma(priv);
 
+	/* Prepare the device for Wake-on-LAN and switch to the slow clock */
+	if (device_may_wakeup(d) && priv->wolopts) {
+		bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
+		clk_prepare_enable(priv->clk_wol);
+	}
+
 	/* Turn off the clocks */
 	clk_disable_unprepare(priv->clk);
 
@@ -2663,6 +2669,12 @@ static int bcmgenet_resume(struct device *d)
 	if (ret)
 		goto out_clk_disable;
 
+	if (priv->wolopts)
+		ret = bcmgenet_wol_resume(priv);
+
+	if (ret)
+		goto out_clk_disable;
+
 	/* disable ethernet MAC while updating its registers */
 	umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);