Merge branch 'hns-phy-loopback'

Lin Yun Sheng says:

====================
Add loopback support in phy_driver and hns ethtool fix

This Patch Set add set_loopback in phy_driver and use it to setup loopback
when doing ethtool phy self_test.

Patch V8:
	Respin the Patch based on net-next

Patch V7:
	1. Add comment why resume the phy in hns_nic_config_phy_loopback.
	2. Fix a typo error in patch description.

Patch V6:
	Fix Or'ing error code in __lb_setup.

Patch V5:
	Removing non loopback related code change.

Patch V4:
	1. Remove c45 checking
	2. Add -ENOTSUPP when function pointer is null,
	   take mutex in phy_loopback.

Patch V3:
	Calling phy_loopback enable and disable in pair in hns mac driver.

Patch V2:
	1. Add phy_loopback in phy_device.c.
	2. Do error checking and do the read and write once in
	   genphy_loopback.
	3. Remove gen10g_loopback in phy_device.c.

Patch V1:
	Initial Submit
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 92 insertions, 71 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns/hnae.h b/drivers/net/ethernet/hisilicon/hns/hnae.h
index 04211ac73b36a3..7ba653af19cb98 100644
--- a/drivers/net/ethernet/hisilicon/hns/hnae.h
+++ b/drivers/net/ethernet/hisilicon/hns/hnae.h
@@ -360,6 +360,7 @@ enum hnae_loop {
 	MAC_INTERNALLOOP_MAC = 0,
 	MAC_INTERNALLOOP_SERDES,
 	MAC_INTERNALLOOP_PHY,
+	MAC_LOOP_PHY_NONE,
 	MAC_LOOP_NONE,
 };
 
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index 00e57bbaf12277..a8db27e86a112c 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -259,67 +259,27 @@ static const char hns_nic_test_strs[][ETH_GSTRING_LEN] = {
 
 static int hns_nic_config_phy_loopback(struct phy_device *phy_dev, u8 en)
 {
-#define COPPER_CONTROL_REG 0
-#define PHY_POWER_DOWN BIT(11)
-#define PHY_LOOP_BACK BIT(14)
-	u16 val = 0;
-
-	if (phy_dev->is_c45) /* c45 branch adding for XGE PHY */
-		return -ENOTSUPP;
+	int err;
 
 	if (en) {
-		/* speed : 1000M */
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 2);
-		phy_write(phy_dev, 21, 0x1046);
-
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
-		/* Force Master */
-		phy_write(phy_dev, 9, 0x1F00);
-
-		/* Soft-reset */
-		phy_write(phy_dev, 0, 0x9140);
-		/* If autoneg disabled,two soft-reset operations */
-		phy_write(phy_dev, 0, 0x9140);
-
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0xFA);
-
-		/* Default is 0x0400 */
-		phy_write(phy_dev, 1, 0x418);
-
-		/* Force 1000M Link, Default is 0x0200 */
-		phy_write(phy_dev, 7, 0x20C);
-
-		/* Powerup Fiber */
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 1);
-		val = phy_read(phy_dev, COPPER_CONTROL_REG);
-		val &= ~PHY_POWER_DOWN;
-		phy_write(phy_dev, COPPER_CONTROL_REG, val);
-
-		/* Enable Phy Loopback */
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
-		val = phy_read(phy_dev, COPPER_CONTROL_REG);
-		val |= PHY_LOOP_BACK;
-		val &= ~PHY_POWER_DOWN;
-		phy_write(phy_dev, COPPER_CONTROL_REG, val);
+		/* Doing phy loopback in offline state, phy resuming is
+		 * needed to power up the device.
+		 */
+		err = phy_resume(phy_dev);
+		if (err)
+			goto out;
+
+		err = phy_loopback(phy_dev, true);
 	} else {
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0xFA);
-		phy_write(phy_dev, 1, 0x400);
-		phy_write(phy_dev, 7, 0x200);
-
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 1);
-		val = phy_read(phy_dev, COPPER_CONTROL_REG);
-		val |= PHY_POWER_DOWN;
-		phy_write(phy_dev, COPPER_CONTROL_REG, val);
-
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
-		phy_write(phy_dev, 9, 0xF00);
-
-		val = phy_read(phy_dev, COPPER_CONTROL_REG);
-		val &= ~PHY_LOOP_BACK;
-		val |= PHY_POWER_DOWN;
-		phy_write(phy_dev, COPPER_CONTROL_REG, val);
+		err = phy_loopback(phy_dev, false);
+		if (err)
+			goto out;
+
+		err = phy_suspend(phy_dev);
 	}
-	return 0;
+
+out:
+	return err;
 }
 
 static int __lb_setup(struct net_device *ndev,
@@ -332,10 +292,9 @@ static int __lb_setup(struct net_device *ndev,
 
 	switch (loop) {
 	case MAC_INTERNALLOOP_PHY:
-		if ((phy_dev) && (!phy_dev->is_c45)) {
-			ret = hns_nic_config_phy_loopback(phy_dev, 0x1);
-			ret |= h->dev->ops->set_loopback(h, loop, 0x1);
-		}
+		ret = hns_nic_config_phy_loopback(phy_dev, 0x1);
+		if (!ret)
+			ret = h->dev->ops->set_loopback(h, loop, 0x1);
 		break;
 	case MAC_INTERNALLOOP_MAC:
 		if ((h->dev->ops->set_loopback) &&
@@ -346,17 +305,17 @@ static int __lb_setup(struct net_device *ndev,
 		if (h->dev->ops->set_loopback)
 			ret = h->dev->ops->set_loopback(h, loop, 0x1);
 		break;
+	case MAC_LOOP_PHY_NONE:
+		ret = hns_nic_config_phy_loopback(phy_dev, 0x0);
 	case MAC_LOOP_NONE:
-		if ((phy_dev) && (!phy_dev->is_c45))
-			ret |= hns_nic_config_phy_loopback(phy_dev, 0x0);
-
-		if (h->dev->ops->set_loopback) {
+		if (!ret && h->dev->ops->set_loopback) {
 			if (priv->ae_handle->phy_if != PHY_INTERFACE_MODE_XGMII)
-				ret |= h->dev->ops->set_loopback(h,
+				ret = h->dev->ops->set_loopback(h,
 					MAC_INTERNALLOOP_MAC, 0x0);
 
-			ret |= h->dev->ops->set_loopback(h,
-				MAC_INTERNALLOOP_SERDES, 0x0);
+			if (!ret)
+				ret = h->dev->ops->set_loopback(h,
+					MAC_INTERNALLOOP_SERDES, 0x0);
 		}
 		break;
 	default:
@@ -582,13 +541,16 @@ static int __lb_run_test(struct net_device *ndev,
 	return ret_val;
 }
 
-static int __lb_down(struct net_device *ndev)
+static int __lb_down(struct net_device *ndev, enum hnae_loop loop)
 {
 	struct hns_nic_priv *priv = netdev_priv(ndev);
 	struct hnae_handle *h = priv->ae_handle;
 	int ret;
 
-	ret = __lb_setup(ndev, MAC_LOOP_NONE);
+	if (loop == MAC_INTERNALLOOP_PHY)
+		ret = __lb_setup(ndev, MAC_LOOP_PHY_NONE);
+	else
+		ret = __lb_setup(ndev, MAC_LOOP_NONE);
 	if (ret)
 		netdev_err(ndev, "%s: __lb_setup return error(%d)!\n",
 			   __func__,
@@ -644,7 +606,8 @@ static void hns_nic_self_test(struct net_device *ndev,
 			if (!data[test_index]) {
 				data[test_index] = __lb_run_test(
 					ndev, (enum hnae_loop)st_param[i][0]);
-				(void)__lb_down(ndev);
+				(void)__lb_down(ndev,
+						(enum hnae_loop)st_param[i][0]);
 			}
 
 			if (data[test_index])
diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 8400403b3f622e..5d314f143aea86 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -2171,6 +2171,7 @@ static struct phy_driver marvell_drivers[] = {
 		.get_sset_count = marvell_get_sset_count,
 		.get_strings = marvell_get_strings,
 		.get_stats = marvell_get_stats,
+		.set_loopback = genphy_loopback,
 	},
 	{
 		.phy_id = MARVELL_PHY_ID_88E1540,
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index acf00f071c9a09..1790f7fec12573 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1136,6 +1136,39 @@ int phy_resume(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(phy_resume);
 
+int phy_loopback(struct phy_device *phydev, bool enable)
+{
+	struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
+	int ret = 0;
+
+	mutex_lock(&phydev->lock);
+
+	if (enable && phydev->loopback_enabled) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	if (!enable && !phydev->loopback_enabled) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (phydev->drv && phydrv->set_loopback)
+		ret = phydrv->set_loopback(phydev, enable);
+	else
+		ret = -EOPNOTSUPP;
+
+	if (ret)
+		goto out;
+
+	phydev->loopback_enabled = enable;
+
+out:
+	mutex_unlock(&phydev->lock);
+	return ret;
+}
+EXPORT_SYMBOL(phy_loopback);
+
 /* Generic PHY support and helper functions */
 
 /**
@@ -1584,6 +1617,23 @@ int genphy_resume(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(genphy_resume);
 
+int genphy_loopback(struct phy_device *phydev, bool enable)
+{
+	int value;
+
+	value = phy_read(phydev, MII_BMCR);
+	if (value < 0)
+		return value;
+
+	if (enable)
+		value |= BMCR_LOOPBACK;
+	else
+		value &= ~BMCR_LOOPBACK;
+
+	return phy_write(phydev, MII_BMCR, value);
+}
+EXPORT_SYMBOL(genphy_loopback);
+
 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
 {
 	/* The default values for phydev->supported are provided by the PHY
@@ -1829,6 +1879,7 @@ static struct phy_driver genphy_driver = {
 	.read_status	= genphy_read_status,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
+	.set_loopback   = genphy_loopback,
 };
 
 static int __init phy_init(void)
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 1d8d70193782de..2a9567bb818636 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -372,6 +372,7 @@ struct phy_c45_device_ids {
  * has_fixups: Set to true if this phy has fixups/quirks.
  * suspended: Set to true if this phy has been suspended successfully.
  * sysfs_links: Internal boolean tracking sysfs symbolic links setup/removal.
+ * loopback_enabled: Set true if this phy has been loopbacked successfully.
  * state: state of the PHY for management purposes
  * dev_flags: Device-specific flags used by the PHY driver.
  * link_timeout: The number of timer firings to wait before the
@@ -409,6 +410,7 @@ struct phy_device {
 	bool has_fixups;
 	bool suspended;
 	bool sysfs_links;
+	bool loopback_enabled;
 
 	enum phy_state state;
 
@@ -648,6 +650,7 @@ struct phy_driver {
 	int (*set_tunable)(struct phy_device *dev,
 			    struct ethtool_tunable *tuna,
 			    const void *data);
+	int (*set_loopback)(struct phy_device *dev, bool enable);
 };
 #define to_phy_driver(d) container_of(to_mdio_common_driver(d),		\
 				      struct phy_driver, mdiodrv)
@@ -793,6 +796,7 @@ void phy_device_remove(struct phy_device *phydev);
 int phy_init_hw(struct phy_device *phydev);
 int phy_suspend(struct phy_device *phydev);
 int phy_resume(struct phy_device *phydev);
+int phy_loopback(struct phy_device *phydev, bool enable);
 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
 			      phy_interface_t interface);
 struct phy_device *phy_find_first(struct mii_bus *bus);
@@ -847,6 +851,7 @@ int genphy_update_link(struct phy_device *phydev);
 int genphy_read_status(struct phy_device *phydev);
 int genphy_suspend(struct phy_device *phydev);
 int genphy_resume(struct phy_device *phydev);
+int genphy_loopback(struct phy_device *phydev, bool enable);
 int genphy_soft_reset(struct phy_device *phydev);
 static inline int genphy_no_soft_reset(struct phy_device *phydev)
 {