netdev - [RFC/RFTv3 19/24] net: usb: lan78xx: Fixup EEE

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Date:   Fri, 31 Mar 2023 02:55:13 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     netdev <netdev@...r.kernel.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Andrew Lunn <andrew@...n.ch>
Subject: [RFC/RFTv3 19/24] net: usb: lan78xx: Fixup EEE

The enabling/disabling of EEE in the MAC should happen as a result of
auto negotiation. So move the enable/disable into
lan783xx_phy_link_status_change() which gets called by phylib when
there is a change in link status.

lan78xx_set_eee() now just programs the hardware with the LTI
timer value, and passed everything else to phylib, so it can correctly
setup the PHY.

lan743x_get_eee() relies on phylib doing most of the work, the
MAC driver just adds the LTI timer value.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
v3: Fixup compiler error, missing read in read/modify/write.
---
 drivers/net/usb/lan78xx.c | 42 +++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 22 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index c458c030fadf..729183e57080 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1690,17 +1690,10 @@ static int lan78xx_get_eee(struct net_device *net, struct ethtool_eee *edata)
 
 	ret = lan78xx_read_reg(dev, MAC_CR, &buf);
 	if (buf & MAC_CR_EEE_EN_) {
-		edata->eee_enabled = true;
-		edata->eee_active = !!(edata->advertised &
-				       edata->lp_advertised);
-		edata->tx_lpi_enabled = true;
 		/* EEE_TX_LPI_REQ_DLY & tx_lpi_timer are same uSec unit */
 		ret = lan78xx_read_reg(dev, EEE_TX_LPI_REQ_DLY, &buf);
 		edata->tx_lpi_timer = buf;
 	} else {
-		edata->eee_enabled = false;
-		edata->eee_active = false;
-		edata->tx_lpi_enabled = false;
 		edata->tx_lpi_timer = 0;
 	}
 
@@ -1721,24 +1714,16 @@ static int lan78xx_set_eee(struct net_device *net, struct ethtool_eee *edata)
 	if (ret < 0)
 		return ret;
 
-	if (edata->eee_enabled) {
-		ret = lan78xx_read_reg(dev, MAC_CR, &buf);
-		buf |= MAC_CR_EEE_EN_;
-		ret = lan78xx_write_reg(dev, MAC_CR, buf);
-
-		phy_ethtool_set_eee(net->phydev, edata);
-
-		buf = (u32)edata->tx_lpi_timer;
-		ret = lan78xx_write_reg(dev, EEE_TX_LPI_REQ_DLY, buf);
-	} else {
-		ret = lan78xx_read_reg(dev, MAC_CR, &buf);
-		buf &= ~MAC_CR_EEE_EN_;
-		ret = lan78xx_write_reg(dev, MAC_CR, buf);
-	}
+	ret = phy_ethtool_set_eee(net->phydev, edata);
+	if (ret < 0)
+		goto out;
 
+	buf = (u32)edata->tx_lpi_timer;
+	ret = lan78xx_write_reg(dev, EEE_TX_LPI_REQ_DLY, buf);
+out:
 	usb_autopm_put_interface(dev->intf);
 
-	return 0;
+	return ret;
 }
 
 static u32 lan78xx_get_link(struct net_device *net)
@@ -2114,7 +2099,20 @@ static void lan78xx_remove_mdio(struct lan78xx_net *dev)
 
 static void lan78xx_link_status_change(struct net_device *net)
 {
+	struct lan78xx_net *dev = netdev_priv(net);
 	struct phy_device *phydev = net->phydev;
+	u32 data;
+	int ret;
+
+	ret = lan78xx_read_reg(dev, MAC_CR, &data);
+	if (ret < 0)
+		return;
+
+	if (phydev->eee_active)
+		data |=  MAC_CR_EEE_EN_;
+	else
+		data &= ~MAC_CR_EEE_EN_;
+	lan78xx_write_reg(dev, MAC_CR, data);
 
 	phy_print_status(phydev);
 }
-- 
2.40.0