smsc75xx: refactor entering suspend modes

This patch splits out the logic for entering suspend modes
to separate functions, to reduce the complexity of the
smsc75xx_suspend function.

Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/smsc75xx.c

@@ -1214,6 +1214,42 @@ static int smsc75xx_write_wuff(struct usbnet *dev, int filter, u32 wuf_cfg,
 	return 0;
 }
 
+static int smsc75xx_enter_suspend0(struct usbnet *dev)
+{
+	u32 val;
+	int ret;
+
+	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
+	check_warn_return(ret, "Error reading PMT_CTL\n");
+
+	val &= (~(PMT_CTL_SUS_MODE | PMT_CTL_PHY_RST));
+	val |= PMT_CTL_SUS_MODE_0 | PMT_CTL_WOL_EN | PMT_CTL_WUPS;
+
+	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
+	check_warn_return(ret, "Error writing PMT_CTL\n");
+
+	smsc75xx_set_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
+
+	return 0;
+}
+
+static int smsc75xx_enter_suspend2(struct usbnet *dev)
+{
+	u32 val;
+	int ret;
+
+	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
+	check_warn_return(ret, "Error reading PMT_CTL\n");
+
+	val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
+	val |= PMT_CTL_SUS_MODE_2;
+
+	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
+	check_warn_return(ret, "Error writing PMT_CTL\n");
+
+	return 0;
+}
+
 static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct usbnet *dev = usb_get_intfdata(intf);
@@ -1245,17 +1281,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
 		check_warn_return(ret, "Error writing PMT_CTL\n");
 
-		/* enter suspend2 mode */
-		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
-		check_warn_return(ret, "Error reading PMT_CTL\n");
-
-		val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
-		val |= PMT_CTL_SUS_MODE_2;
-
-		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
-		check_warn_return(ret, "Error writing PMT_CTL\n");
-
-		return 0;
+		return smsc75xx_enter_suspend2(dev);
 	}
 
 	if (pdata->wolopts & (WAKE_MCAST | WAKE_ARP)) {
@@ -1369,19 +1395,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 
 	/* some wol options are enabled, so enter SUSPEND0 */
 	netdev_info(dev->net, "entering SUSPEND0 mode\n");
-
-	ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
-	check_warn_return(ret, "Error reading PMT_CTL\n");
-
-	val &= (~(PMT_CTL_SUS_MODE | PMT_CTL_PHY_RST));
-	val |= PMT_CTL_SUS_MODE_0 | PMT_CTL_WOL_EN | PMT_CTL_WUPS;
-
-	ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
-	check_warn_return(ret, "Error writing PMT_CTL\n");
-
-	smsc75xx_set_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
-
-	return 0;
+	return smsc75xx_enter_suspend0(dev);
 }
 
 static int smsc75xx_resume(struct usb_interface *intf)