[PATCH net-next v2 09/10] net: stmmac: Create DW XPCS device with particular address

[Serge Semin <fancer.lancer@xxxxxxxxx>]

Currently the only STMMAC platform driver using the DW XPCS code is the
Intel mGBE device driver. (It can be determined by finding all the drivers
having the stmmac_mdio_bus_data::has_xpcs flag set.) At the same time the
low-level platform driver masks out the DW XPCS MDIO-address from being
auto-detected as PHY by the MDIO subsystem core. Seeing the PCS MDIO ID is
known the procedure of the DW XPCS device creation can be simplified by
dropping the loop over all the MDIO IDs. From now the DW XPCS device
descriptor will be created for the pre-defined MDIO-bus address.

Note besides this shall speed up a bit the Intel mGBE probing.

Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>

---

Changelog v2:
- This is a new patch introduced on v2 stage of the review.
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c |  1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 15 ++++-----------
 include/linux/stmmac.h                            |  1 +
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 56649edb18cd..e60b7e955c35 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -586,6 +586,7 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 	if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII ||
 	    plat->phy_interface == PHY_INTERFACE_MODE_1000BASEX) {
 		plat->mdio_bus_data->has_xpcs = true;
+		plat->mdio_bus_data->xpcs_addr = INTEL_MGBE_XPCS_ADDR;
 		plat->mdio_bus_data->default_an_inband = true;
 	}
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index aa43117134d3..807789d7309a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -499,8 +499,7 @@ int stmmac_pcs_setup(struct net_device *ndev)
 {
 	struct dw_xpcs *xpcs = NULL;
 	struct stmmac_priv *priv;
-	int ret = -ENODEV;
-	int mode, addr;
+	int addr, mode, ret;
 
 	priv = netdev_priv(ndev);
 	mode = priv->plat->phy_interface;
@@ -509,15 +508,9 @@ int stmmac_pcs_setup(struct net_device *ndev)
 		ret = priv->plat->pcs_init(priv);
 	} else if (priv->plat->mdio_bus_data &&
 		   priv->plat->mdio_bus_data->has_xpcs) {
-		/* Try to probe the XPCS by scanning all addresses */
-		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-			xpcs = xpcs_create_mdiodev(priv->mii, addr, mode);
-			if (IS_ERR(xpcs))
-				continue;
-
-			ret = 0;
-			break;
-		}
+		addr = priv->plat->mdio_bus_data->xpcs_addr;
+		xpcs = xpcs_create_mdiodev(priv->mii, addr, mode);
+		ret = PTR_ERR_OR_ZERO(xpcs);
 	} else {
 		return 0;
 	}
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index f337286623bb..a11b850d3672 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -83,6 +83,7 @@ struct stmmac_priv;
 struct stmmac_mdio_bus_data {
 	unsigned int phy_mask;
 	unsigned int has_xpcs;
+	unsigned int xpcs_addr;
 	unsigned int default_an_inband;
 	int *irqs;
 	int probed_phy_irq;
-- 
2.43.0