Merge branch 'r8152-autoresume'

Hayes Wang says:

====================
r8152: fix the autoresume may fail

Fix the autosuspend issues which occur about linking change.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/usb/r8152.c

@@ -26,8 +26,13 @@
 #include <linux/mdio.h>
 #include <linux/usb/cdc.h>
 
-/* Version Information */
-#define DRIVER_VERSION "v1.08.1 (2015/07/28)"
+/* Information for net-next */
+#define NETNEXT_VERSION		"08"
+
+/* Information for net */
+#define NET_VERSION		"2"
+
+#define DRIVER_VERSION		"v1." NETNEXT_VERSION "." NET_VERSION
 #define DRIVER_AUTHOR "Realtek linux nic maintainers <nic_swsd@realtek.com>"
 #define DRIVER_DESC "Realtek RTL8152/RTL8153 Based USB Ethernet Adapters"
 #define MODULENAME "r8152"
@@ -143,6 +148,7 @@
 #define OCP_EEE_ABLE		0xa5c4
 #define OCP_EEE_ADV		0xa5d0
 #define OCP_EEE_LPABLE		0xa5d2
+#define OCP_PHY_STATE		0xa708		/* nway state for 8153 */
 #define OCP_ADC_CFG		0xbc06
 
 /* SRAM Register */
@@ -427,6 +433,10 @@
 /* OCP_DOWN_SPEED */
 #define EN_10M_BGOFF		0x0080
 
+/* OCP_PHY_STATE */
+#define TXDIS_STATE		0x01
+#define ABD_STATE		0x02
+
 /* OCP_ADC_CFG */
 #define CKADSEL_L		0x0100
 #define ADC_EN			0x0080
@@ -604,6 +614,7 @@ struct r8152 {
 		void (*unload)(struct r8152 *);
 		int (*eee_get)(struct r8152 *, struct ethtool_eee *);
 		int (*eee_set)(struct r8152 *, struct ethtool_eee *);
+		bool (*in_nway)(struct r8152 *);
 	} rtl_ops;
 
 	int intr_interval;
@@ -2941,6 +2952,32 @@ static void rtl8153_down(struct r8152 *tp)
 	r8153_enable_aldps(tp);
 }
 
+static bool rtl8152_in_nway(struct r8152 *tp)
+{
+	u16 nway_state;
+
+	ocp_write_word(tp, MCU_TYPE_PLA, PLA_OCP_GPHY_BASE, 0x2000);
+	tp->ocp_base = 0x2000;
+	ocp_write_byte(tp, MCU_TYPE_PLA, 0xb014, 0x4c);		/* phy state */
+	nway_state = ocp_read_word(tp, MCU_TYPE_PLA, 0xb01a);
+
+	/* bit 15: TXDIS_STATE, bit 14: ABD_STATE */
+	if (nway_state & 0xc000)
+		return false;
+	else
+		return true;
+}
+
+static bool rtl8153_in_nway(struct r8152 *tp)
+{
+	u16 phy_state = ocp_reg_read(tp, OCP_PHY_STATE) & 0xff;
+
+	if (phy_state == TXDIS_STATE || phy_state == ABD_STATE)
+		return false;
+	else
+		return true;
+}
+
 static void set_carrier(struct r8152 *tp)
 {
 	struct net_device *netdev = tp->netdev;
@@ -3405,6 +3442,27 @@ static int rtl8152_post_reset(struct usb_interface *intf)
 	return 0;
 }
 
+static bool delay_autosuspend(struct r8152 *tp)
+{
+	bool sw_linking = !!netif_carrier_ok(tp->netdev);
+	bool hw_linking = !!(rtl8152_get_speed(tp) & LINK_STATUS);
+
+	/* This means a linking change occurs and the driver doesn't detect it,
+	 * yet. If the driver has disabled tx/rx and hw is linking on, the
+	 * device wouldn't wake up by receiving any packet.
+	 */
+	if (work_busy(&tp->schedule.work) || sw_linking != hw_linking)
+		return true;
+
+	/* If the linking down is occurred by nway, the device may miss the
+	 * linking change event. And it wouldn't wake when linking on.
+	 */
+	if (!sw_linking && tp->rtl_ops.in_nway(tp))
+		return true;
+	else
+		return false;
+}
+
 static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct r8152 *tp = usb_get_intfdata(intf);
@@ -3414,7 +3472,7 @@ static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)
 	mutex_lock(&tp->control);
 
 	if (PMSG_IS_AUTO(message)) {
-		if (netif_running(netdev) && work_busy(&tp->schedule.work)) {
+		if (netif_running(netdev) && delay_autosuspend(tp)) {
 			ret = -EBUSY;
 			goto out1;
 		}
@@ -4044,6 +4102,7 @@ static int rtl_ops_init(struct r8152 *tp)
 		ops->unload		= rtl8152_unload;
 		ops->eee_get		= r8152_get_eee;
 		ops->eee_set		= r8152_set_eee;
+		ops->in_nway		= rtl8152_in_nway;
 		break;
 
 	case RTL_VER_03:
@@ -4058,6 +4117,7 @@ static int rtl_ops_init(struct r8152 *tp)
 		ops->unload		= rtl8153_unload;
 		ops->eee_get		= r8153_get_eee;
 		ops->eee_set		= r8153_set_eee;
+		ops->in_nway		= rtl8153_in_nway;
 		break;
 
 	default: