linux-kernel - [PATCH 2/2] net: dsa: ksz8795: adjust CPU link to host interface

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Message-Id: <20201129102400.157786-2-jean.pihet@newoldbits.com>
Date:   Sun, 29 Nov 2020 11:24:00 +0100
From:   Jean Pihet <jean.pihet@...oldbits.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ryan Barnett <ryan.barnett@...kwellcollins.com>,
        Conrad Ratschan <conrad.ratschan@...kwellcollins.com>,
        Hugo Cornelis <hugo.cornelis@...ensium.com>,
        Arnout Vandecappelle <arnout.vandecappelle@...ensium.com>,
        Jean Pihet <jean.pihet@...oldbits.com>
Subject: [PATCH 2/2] net: dsa: ksz8795: adjust CPU link to host interface

Add support for RGMII in 100 and 1000 Mbps.

Adjust the CPU port based on the host interface settings: interface
MII type, speed, duplex.

Signed-off-by: Jean Pihet <jean.pihet@...oldbits.com>
---
 drivers/net/dsa/microchip/ksz8795.c | 93 ++++++++++++++++++-----------
 1 file changed, 57 insertions(+), 36 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 1e101ab56cea..09c1173cc607 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -916,10 +916,53 @@ static void ksz8795_port_mirror_del(struct dsa_switch *ds, int port,
 			     PORT_MIRROR_SNIFFER, false);
 }
 
+static void ksz8795_mii_config(struct ksz_device *dev, struct ksz_port *p)
+{
+	u8 data8;
+
+	/* Configure MII interface for proper network communication. */
+	ksz_read8(dev, REG_PORT_5_CTRL_6, &data8);
+	data8 &= ~PORT_INTERFACE_TYPE;
+	data8 &= ~PORT_GMII_1GPS_MODE;
+	switch (p->interface) {
+	case PHY_INTERFACE_MODE_MII:
+		p->phydev.speed = SPEED_100;
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		data8 |= PORT_INTERFACE_RMII;
+		p->phydev.speed = SPEED_100;
+		break;
+	case PHY_INTERFACE_MODE_GMII:
+		data8 |= PORT_GMII_1GPS_MODE;
+		data8 |= PORT_INTERFACE_GMII;
+		p->phydev.speed = SPEED_1000;
+		break;
+	default:
+		data8 &= ~PORT_RGMII_ID_IN_ENABLE;
+		data8 &= ~PORT_RGMII_ID_OUT_ENABLE;
+		if (p->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+		    p->interface == PHY_INTERFACE_MODE_RGMII_RXID)
+			data8 |= PORT_RGMII_ID_IN_ENABLE;
+		if (p->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+		    p->interface == PHY_INTERFACE_MODE_RGMII_TXID)
+			data8 |= PORT_RGMII_ID_OUT_ENABLE;
+		/* Support RGMII in 100 and 1000 Mbps */
+		if (p->phydev.speed == SPEED_1000) {
+			data8 |= PORT_GMII_1GPS_MODE;
+		} else {
+			p->phydev.speed = SPEED_100;
+		}
+		data8 |= PORT_INTERFACE_RGMII;
+		break;
+	}
+	ksz_write8(dev, REG_PORT_5_CTRL_6, data8);
+	p->phydev.duplex = 1;
+}
+
 static void ksz8795_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 {
 	struct ksz_port *p = &dev->ports[port];
-	u8 data8, member;
+	u8 member;
 
 	/* enable broadcast storm limit */
 	ksz_port_cfg(dev, port, P_BCAST_STORM_CTRL, PORT_BROADCAST_STORM, true);
@@ -943,41 +986,7 @@ static void ksz8795_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 				 port);
 			p->interface = dev->compat_interface;
 		}
-
-		/* Configure MII interface for proper network communication. */
-		ksz_read8(dev, REG_PORT_5_CTRL_6, &data8);
-		data8 &= ~PORT_INTERFACE_TYPE;
-		data8 &= ~PORT_GMII_1GPS_MODE;
-		switch (p->interface) {
-		case PHY_INTERFACE_MODE_MII:
-			p->phydev.speed = SPEED_100;
-			break;
-		case PHY_INTERFACE_MODE_RMII:
-			data8 |= PORT_INTERFACE_RMII;
-			p->phydev.speed = SPEED_100;
-			break;
-		case PHY_INTERFACE_MODE_GMII:
-			data8 |= PORT_GMII_1GPS_MODE;
-			data8 |= PORT_INTERFACE_GMII;
-			p->phydev.speed = SPEED_1000;
-			break;
-		default:
-			data8 &= ~PORT_RGMII_ID_IN_ENABLE;
-			data8 &= ~PORT_RGMII_ID_OUT_ENABLE;
-			if (p->interface == PHY_INTERFACE_MODE_RGMII_ID ||
-			    p->interface == PHY_INTERFACE_MODE_RGMII_RXID)
-				data8 |= PORT_RGMII_ID_IN_ENABLE;
-			if (p->interface == PHY_INTERFACE_MODE_RGMII_ID ||
-			    p->interface == PHY_INTERFACE_MODE_RGMII_TXID)
-				data8 |= PORT_RGMII_ID_OUT_ENABLE;
-			data8 |= PORT_GMII_1GPS_MODE;
-			data8 |= PORT_INTERFACE_RGMII;
-			p->phydev.speed = SPEED_1000;
-			break;
-		}
-		ksz_write8(dev, REG_PORT_5_CTRL_6, data8);
-		p->phydev.duplex = 1;
-
+        ksz8795_mii_config(dev, p);
 		member = dev->port_mask;
 	} else {
 		member = dev->host_mask | p->vid_member;
@@ -1102,11 +1111,23 @@ static int ksz8795_setup(struct dsa_switch *ds)
 	return 0;
 }
 
+void ksz8795_adjust_link(struct dsa_switch *ds, int port,
+						 struct phy_device *phydev)
+{
+	struct ksz_device *dev = ds->priv;
+	struct ksz_port *p = &dev->ports[port];
+
+	/* Adjust the link interface mode and speed for the CPU port */
+	if (port == dev->cpu_port)
+		ksz8795_mii_config(dev, p);
+}
+
 static const struct dsa_switch_ops ksz8795_switch_ops = {
 	.get_tag_protocol	= ksz8795_get_tag_protocol,
 	.setup			= ksz8795_setup,
 	.phy_read		= ksz_phy_read16,
 	.phy_write		= ksz_phy_write16,
+	.adjust_link		= ksz8795_adjust_link,
 	.phylink_mac_link_down	= ksz_mac_link_down,
 	.port_enable		= ksz_enable_port,
 	.get_strings		= ksz8795_get_strings,
-- 
2.26.2