[PATCH net-next v3 1/3] net: stmmac: split xPCS setup from mdio register

[Michael Sit Wei Hong]

From: Voon Weifeng <weifeng.voon@xxxxxxxxx>

This patch is a preparation patch for the enabling of Intel mGbE 2.5Gbps
link speed. The Intel mGbR link speed configuration (1G/2.5G) is depends on
a mdio ADHOC register which can be configured in the bios menu.
As PHY interface might be different for 1G and 2.5G, the mdio bus need be
ready to check the link speed and select the PHY interface before probing
the xPCS.

Signed-off-by: Voon Weifeng <weifeng.voon@xxxxxxxxx>
Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@xxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  1 +
 .../net/ethernet/stmicro/stmmac/stmmac_main.c |  7 ++
 .../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 64 +++++++++++--------
 3 files changed, 45 insertions(+), 27 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index b6cd43eda7ac..fd7212afc543 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -311,6 +311,7 @@ enum stmmac_state {
 int stmmac_mdio_unregister(struct net_device *ndev);
 int stmmac_mdio_register(struct net_device *ndev);
 int stmmac_mdio_reset(struct mii_bus *mii);
+int stmmac_xpcs_setup(struct mii_bus *mii);
 void stmmac_set_ethtool_ops(struct net_device *netdev);
 
 void stmmac_ptp_register(struct stmmac_priv *priv);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index bf9fe25fed69..59505fa7afa1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6989,6 +6989,12 @@ int stmmac_dvr_probe(struct device *device,
 		}
 	}
 
+	if (priv->plat->mdio_bus_data->has_xpcs) {
+		ret = stmmac_xpcs_setup(priv->mii);
+		if (ret)
+			goto error_xpcs_setup;
+	}
+
 	ret = stmmac_phy_setup(priv);
 	if (ret) {
 		netdev_err(ndev, "failed to setup phy (%d)\n", ret);
@@ -7025,6 +7031,7 @@ int stmmac_dvr_probe(struct device *device,
 	unregister_netdev(ndev);
 error_netdev_register:
 	phylink_destroy(priv->phylink);
+error_xpcs_setup:
 error_phy_setup:
 	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index b750074f8f9c..3bde0f7f91ae 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -397,6 +397,43 @@ int stmmac_mdio_reset(struct mii_bus *bus)
 	return 0;
 }
 
+int stmmac_xpcs_setup(struct mii_bus *bus)
+{
+	int mode, max_addr, addr, found, ret;
+	struct net_device *ndev = bus->priv;
+	struct mdio_xpcs_args *xpcs;
+	struct stmmac_priv *priv;
+
+	priv = netdev_priv(ndev);
+	xpcs = &priv->hw->xpcs_args;
+	mode = priv->plat->phy_interface;
+	max_addr = PHY_MAX_ADDR;
+
+	priv->hw->xpcs = mdio_xpcs_get_ops();
+	if (!priv->hw->xpcs)
+		return -ENODEV;
+
+	/* Try to probe the XPCS by scanning all addresses. */
+	xpcs->bus = bus;
+
+	for (addr = 0; addr < max_addr; addr++) {
+		xpcs->addr = addr;
+
+		ret = stmmac_xpcs_probe(priv, xpcs, mode);
+		if (!ret) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found) {
+		dev_warn(priv->device, "No xPCS found\n");
+		return -ENODEV;
+	}
+
+	return ret;
+}
+
 /**
  * stmmac_mdio_register
  * @ndev: net device structure
@@ -444,14 +481,6 @@ int stmmac_mdio_register(struct net_device *ndev)
 		max_addr = PHY_MAX_ADDR;
 	}
 
-	if (mdio_bus_data->has_xpcs) {
-		priv->hw->xpcs = mdio_xpcs_get_ops();
-		if (!priv->hw->xpcs) {
-			err = -ENODEV;
-			goto bus_register_fail;
-		}
-	}
-
 	if (mdio_bus_data->needs_reset)
 		new_bus->reset = &stmmac_mdio_reset;
 
@@ -503,25 +532,6 @@ int stmmac_mdio_register(struct net_device *ndev)
 		found = 1;
 	}
 
-	/* Try to probe the XPCS by scanning all addresses. */
-	if (priv->hw->xpcs) {
-		struct mdio_xpcs_args *xpcs = &priv->hw->xpcs_args;
-		int ret, mode = priv->plat->phy_interface;
-		max_addr = PHY_MAX_ADDR;
-
-		xpcs->bus = new_bus;
-
-		for (addr = 0; addr < max_addr; addr++) {
-			xpcs->addr = addr;
-
-			ret = stmmac_xpcs_probe(priv, xpcs, mode);
-			if (!ret) {
-				found = 1;
-				break;
-			}
-		}
-	}
-
 	if (!found && !mdio_node) {
 		dev_warn(dev, "No PHY found\n");
 		mdiobus_unregister(new_bus);
-- 
2.17.1