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Date:   Wed, 2 Sep 2020 08:25:56 -0500
From:   Dan Murphy <dmurphy@...com>
To:     <davem@...emloft.net>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <hkallweit1@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Dan Murphy <dmurphy@...com>
Subject: [PATCH net-next] net: dp83869: Add ability to advertise Fiber connection

Add the ability to advertise the Fiber connection if the strap or the
op-mode is configured for 100Base-FX.

Auto negotiation is not supported on this PHY when in fiber mode.

Signed-off-by: Dan Murphy <dmurphy@...com>
---
 drivers/net/phy/dp83869.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
index 58103152c601..1acf498832f1 100644
--- a/drivers/net/phy/dp83869.c
+++ b/drivers/net/phy/dp83869.c
@@ -52,6 +52,11 @@
 					 BMCR_FULLDPLX | \
 					 BMCR_SPEED1000)
 
+#define MII_DP83869_FIBER_ADVERTISE    (ADVERTISED_TP | ADVERTISED_MII | \
+					ADVERTISED_FIBRE | ADVERTISED_BNC |  \
+					ADVERTISED_Pause | ADVERTISED_Asym_Pause | \
+					ADVERTISED_100baseT_Full)
+
 /* This is the same bit mask as the BMCR so re-use the BMCR default */
 #define DP83869_FX_CTRL_DEFAULT	MII_DP83869_BMCR_DEFAULT
 
@@ -300,6 +305,7 @@ static int dp83869_configure_mode(struct phy_device *phydev,
 {
 	int phy_ctrl_val;
 	int ret;
+	int bmcr;
 
 	if (dp83869->mode < DP83869_RGMII_COPPER_ETHERNET ||
 	    dp83869->mode > DP83869_SGMII_COPPER_ETHERNET)
@@ -383,7 +389,36 @@ static int dp83869_configure_mode(struct phy_device *phydev,
 
 		break;
 	case DP83869_RGMII_1000_BASE:
+		break;
 	case DP83869_RGMII_100_BASE:
+		/* Only allow advertising what this PHY supports */
+		linkmode_and(phydev->advertising, phydev->advertising,
+			     phydev->supported);
+
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT,
+				 phydev->supported);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT,
+				 phydev->advertising);
+
+		/* Auto neg is not supported in fiber mode */
+		bmcr = phy_read(phydev, MII_BMCR);
+		if (bmcr < 0)
+			return bmcr;
+
+		phydev->autoneg = AUTONEG_DISABLE;
+		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+				   phydev->supported);
+		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+				   phydev->advertising);
+
+		if (bmcr & BMCR_ANENABLE) {
+			ret =  phy_modify(phydev, MII_BMCR, BMCR_ANENABLE, 0);
+			if (ret < 0)
+				return ret;
+		}
+		ret = phy_modify_changed(phydev, MII_ADVERTISE,
+					 MII_DP83869_FIBER_ADVERTISE,
+					 MII_DP83869_FIBER_ADVERTISE);
 		break;
 	default:
 		return -EINVAL;
-- 
2.28.0

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