netdev - [PATCH v1 26/26] net: dsa: microchip: ksz8: do not force flow control by default

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Date:   Mon, 28 Nov 2022 13:00:34 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Arun.Ramadoss@...rochip.com
Subject: [PATCH v1 26/26] net: dsa: microchip: ksz8: do not force flow control by default

Make flow control configurable by moving it to ksz8_phylink_mac_link_up()

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/dsa/microchip/ksz8.h       |  4 ++
 drivers/net/dsa/microchip/ksz8795.c    | 54 ++++++++++++++++++++++----
 drivers/net/dsa/microchip/ksz_common.c |  1 +
 3 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index e3d1bbde008a..77439d9c5fc2 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -56,5 +56,9 @@ int ksz8_switch_detect(struct ksz_device *dev);
 int ksz8_switch_init(struct ksz_device *dev);
 void ksz8_switch_exit(struct ksz_device *dev);
 int ksz8_change_mtu(struct ksz_device *dev, int port, int mtu);
+void ksz8_phylink_mac_link_up(struct ksz_device *dev, int port,
+			      unsigned int mode, phy_interface_t interface,
+			      struct phy_device *phydev, int speed, int duplex,
+			      bool tx_pause, bool rx_pause);
 
 #endif
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 618366fadfb5..4782747b7b61 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -1374,12 +1374,52 @@ void ksz8_config_cpu_port(struct dsa_switch *ds)
 			if (remote & KSZ8_PORT_FIBER_MODE)
 				p->fiber = 1;
 		}
-		if (p->fiber)
-			ksz_port_cfg(dev, i, regs[P_STP_CTRL],
-				     PORT_FORCE_FLOW_CTRL, true);
-		else
-			ksz_port_cfg(dev, i, regs[P_STP_CTRL],
-				     PORT_FORCE_FLOW_CTRL, false);
+	}
+}
+
+void ksz8_phylink_mac_link_up(struct ksz_device *dev, int port,
+			      unsigned int mode, phy_interface_t interface,
+			      struct phy_device *phydev, int speed, int duplex,
+			      bool tx_pause, bool rx_pause)
+{
+	struct dsa_switch *ds = dev->ds;
+	struct ksz_port *p;
+	u8 ctrl = 0;
+
+	p = &dev->ports[port];
+
+	if (dsa_upstream_port(ds, port)) {
+		u8 mask = SW_HALF_DUPLEX_FLOW_CTRL | SW_HALF_DUPLEX |
+			SW_FLOW_CTRL | SW_10_MBIT;
+
+		if (duplex) {
+			if (tx_pause && rx_pause)
+				ctrl |= SW_FLOW_CTRL;
+		} else {
+			ctrl |= SW_HALF_DUPLEX;
+			if (tx_pause && rx_pause)
+				ctrl |= SW_HALF_DUPLEX_FLOW_CTRL;
+		}
+
+		if (speed == SPEED_10)
+			ctrl |= SW_10_MBIT;
+
+		ksz_rmw8(dev, REG_SW_CTRL_4, mask, ctrl);
+
+		p->phydev.speed = speed;
+	} else {
+		const u16 *regs = dev->info->regs;
+
+		if (duplex) {
+			if (tx_pause && rx_pause)
+				ctrl |= PORT_FORCE_FLOW_CTRL;
+		} else {
+			if (tx_pause && rx_pause)
+				ctrl |= PORT_BACK_PRESSURE;
+		}
+
+		ksz_rmw8(dev, regs[P_STP_CTRL], PORT_FORCE_FLOW_CTRL |
+			 PORT_BACK_PRESSURE, ctrl);
 	}
 }
 
@@ -1431,8 +1471,6 @@ int ksz8_setup(struct dsa_switch *ds)
 	 */
 	ds->vlan_filtering_is_global = true;
 
-	ksz_cfg(dev, S_REPLACE_VID_CTRL, SW_FLOW_CTRL, true);
-
 	/* Enable automatic fast aging when link changed detected. */
 	ksz_cfg(dev, S_LINK_AGING_CTRL, SW_LINK_AUTO_AGING, true);
 
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 171cb0063fbf..bfdb4f4f36cc 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -207,6 +207,7 @@ static const struct ksz_dev_ops ksz8_dev_ops = {
 	.mirror_add = ksz8_port_mirror_add,
 	.mirror_del = ksz8_port_mirror_del,
 	.get_caps = ksz8_get_caps,
+	.phylink_mac_link_up = ksz8_phylink_mac_link_up,
 	.config_cpu_port = ksz8_config_cpu_port,
 	.enable_stp_addr = ksz8_enable_stp_addr,
 	.reset = ksz8_reset_switch,
-- 
2.30.2