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From:   Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
To:     <netdev@vger.kernel.org>
CC:     <davem@davemloft.net>, <kuba@kernel.org>,
        <linux-kernel@vger.kernel.org>, <lxu@maxlinear.com>,
        <hkallweit1@gmail.com>, <pabeni@redhat.com>, <edumazet@google.com>,
        <linux@armlinux.org.uk>, <UNGLinuxDriver@microchip.com>,
        <andrew@lunn.ch>, <Ian.Saturley@microchip.com>
Subject: [PATCH net-next] net: phy: mxl-gpy: Add PHY Auto/MDI/MDI-X set driver for GPY211 chips
Date:   Fri, 21 Oct 2022 15:33:05 +0530
Message-ID: <20221021100305.6576-1-Raju.Lakkaraju@microchip.com>
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Add support for MDI-X status and configuration for GPY211 chips

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
---
 drivers/net/phy/mxl-gpy.c | 79 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
index 24bae27eedef..a7b11a86bef5 100644
--- a/drivers/net/phy/mxl-gpy.c
+++ b/drivers/net/phy/mxl-gpy.c
@@ -29,6 +29,10 @@
 #define PHY_ID_GPY241BM		0x67C9DE80
 #define PHY_ID_GPY245B		0x67C9DEC0
 
+#define PHY_CTL1		0x13
+#define PHY_CTL1_MDICD		BIT(3)
+#define PHY_CTL1_MDIAB		BIT(2)
+#define PHY_CTL1_AMDIX		BIT(0)
 #define PHY_MIISTAT		0x18	/* MII state */
 #define PHY_IMASK		0x19	/* interrupt mask */
 #define PHY_ISTAT		0x1A	/* interrupt status */
@@ -59,6 +63,13 @@
 #define PHY_FWV_MAJOR_MASK	GENMASK(11, 8)
 #define PHY_FWV_MINOR_MASK	GENMASK(7, 0)
 
+#define PHY_PMA_MGBT_POLARITY	0x82
+#define PHY_MDI_MDI_X_MASK	GENMASK(1, 0)
+#define PHY_MDI_MDI_X_NORMAL	0x3
+#define PHY_MDI_MDI_X_AB	0x2
+#define PHY_MDI_MDI_X_CD	0x1
+#define PHY_MDI_MDI_X_CROSS	0x0
+
 /* SGMII */
 #define VSPEC1_SGMII_CTRL	0x08
 #define VSPEC1_SGMII_CTRL_ANEN	BIT(12)		/* Aneg enable */
@@ -289,6 +300,36 @@ static bool gpy_sgmii_aneg_en(struct phy_device *phydev)
 	return (ret & VSPEC1_SGMII_CTRL_ANEN) ? true : false;
 }
 
+static int gpy_config_mdix(struct phy_device *phydev, u8 ctrl)
+{
+	int ret;
+	u16 val;
+
+	switch (ctrl) {
+	case ETH_TP_MDI_AUTO:
+		val = PHY_CTL1_AMDIX;
+		break;
+	case ETH_TP_MDI_X:
+		val = (PHY_CTL1_MDIAB | PHY_CTL1_MDICD);
+		break;
+	case ETH_TP_MDI:
+		val = 0;
+		break;
+	default:
+		return 0;
+	}
+
+	ret =  phy_modify(phydev, PHY_CTL1, PHY_CTL1_AMDIX | PHY_CTL1_MDIAB |
+			  PHY_CTL1_MDICD, val);
+	if (ret < 0) {
+		phydev_err(phydev, "Error: MMD register access failed: %d\n",
+			   ret);
+		return ret;
+	}
+
+	return genphy_c45_restart_aneg(phydev);
+}
+
 static int gpy_config_aneg(struct phy_device *phydev)
 {
 	bool changed = false;
@@ -304,6 +345,10 @@ static int gpy_config_aneg(struct phy_device *phydev)
 			: genphy_c45_pma_setup_forced(phydev);
 	}
 
+	ret = gpy_config_mdix(phydev,  phydev->mdix_ctrl);
+	if (ret < 0)
+		return ret;
+
 	ret = genphy_c45_an_config_aneg(phydev);
 	if (ret < 0)
 		return ret;
@@ -370,6 +415,38 @@ static int gpy_config_aneg(struct phy_device *phydev)
 			      VSPEC1_SGMII_CTRL_ANRS, VSPEC1_SGMII_CTRL_ANRS);
 }
 
+static void gpy_update_mdix(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_read(phydev, PHY_CTL1);
+	if (ret < 0) {
+		phydev_err(phydev, "Error: MDIO register access failed: %d\n",
+			   ret);
+		return;
+	}
+
+	if (ret & PHY_CTL1_AMDIX)
+		phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+	else
+		if (ret & PHY_CTL1_MDICD || ret & PHY_CTL1_MDIAB)
+			phydev->mdix_ctrl = ETH_TP_MDI_X;
+		else
+			phydev->mdix_ctrl = ETH_TP_MDI;
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, PHY_PMA_MGBT_POLARITY);
+	if (ret < 0) {
+		phydev_err(phydev, "Error: MMD register access failed: %d\n",
+			   ret);
+		return;
+	}
+
+	if ((ret & PHY_MDI_MDI_X_MASK) < PHY_MDI_MDI_X_NORMAL)
+		phydev->mdix = ETH_TP_MDI_X;
+	else
+		phydev->mdix = ETH_TP_MDI;
+}
+
 static void gpy_update_interface(struct phy_device *phydev)
 {
 	int ret;
@@ -413,6 +490,8 @@ static void gpy_update_interface(struct phy_device *phydev)
 
 	if (phydev->speed == SPEED_2500 || phydev->speed == SPEED_1000)
 		genphy_read_master_slave(phydev);
+
+	gpy_update_mdix(phydev);
 }
 
 static int gpy_read_status(struct phy_device *phydev)
-- 
2.25.1