netdev - [RFC/RFTv3 05/24] net: phy: Immediately call adjust_link if only tx_lpi

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Date:   Fri, 31 Mar 2023 02:54:59 +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 05/24] net: phy: Immediately call adjust_link if only tx_lpi_enabled changes

The MAC driver changes its EEE hardware configuration in its
adjust_link callback. This is called when auto-neg completes. If
set_eee is called with a change to tx_lpi_enabled which does not
trigger an auto-neg, it is necessary to call the adjust_link callback
so that the MAC is reconfigured to take this change into account.

When setting phydev->eee_active, take tx_lpi_enabled into account, so
the MAC drivers don't need to consider tx_lpi_enabled.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
v3: Update phydev->eee_active
---
 drivers/net/phy/phy-c45.c | 11 ++++++++---
 drivers/net/phy/phy.c     | 16 +++++++++++++---
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 29479e142826..a16124668e1d 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -1455,6 +1455,8 @@ EXPORT_SYMBOL(genphy_c45_ethtool_get_eee);
  *
  * Description: it reportes the Supported/Advertisement/LP Advertisement
  * capabilities.
+ * Returns either error code, 0 if there was no change, or positive if
+ * there was a change which triggered auto-neg.
  */
 int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
 			       struct ethtool_eee *data)
@@ -1488,9 +1490,12 @@ int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
 	ret = genphy_c45_an_config_eee_aneg(phydev);
 	if (ret < 0)
 		return ret;
-	if (ret > 0)
-		return phy_restart_aneg(phydev);
-
+	if (ret > 0) {
+		ret = phy_restart_aneg(phydev);
+		if (ret < 0)
+			return ret;
+		return 1;
+	}
 	return 0;
 }
 EXPORT_SYMBOL(genphy_c45_ethtool_set_eee);
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index c7a5d0240211..f4da7a5440e3 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -918,7 +918,7 @@ static void phy_update_eee_active(struct phy_device *phydev)
 	if (err < 0)
 		phydev->eee_active = false;
 	else
-		phydev->eee_active = err;
+		phydev->eee_active = (err & phydev->tx_lpi_enabled);
 }
 
 /**
@@ -1632,11 +1632,21 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
 
 	mutex_lock(&phydev->lock);
 	ret = genphy_c45_ethtool_set_eee(phydev, data);
-	if (!ret)
+	if (ret >= 0) {
+		if (ret == 0) {
+			/* auto-neg not triggered */
+			if (phydev->tx_lpi_enabled != data->tx_lpi_enabled) {
+				phydev->tx_lpi_enabled = data->tx_lpi_enabled;
+				phy_update_eee_active(phydev);
+				if (phydev->link)
+					phy_link_up(phydev);
+			}
+		}
 		phydev->tx_lpi_enabled = data->tx_lpi_enabled;
+	}
 	mutex_unlock(&phydev->lock);
 
-	return ret;
+	return (ret < 0 ? ret : 0);
 }
 EXPORT_SYMBOL(phy_ethtool_set_eee);
 
-- 
2.40.0