netdev - [RFC/RFTv3 06/24] net: phylink: Handle change in EEE from phylib

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Date:   Fri, 31 Mar 2023 02:55:00 +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 06/24] net: phylink: Handle change in EEE from phylib

phylib can indicate a change in EEE outside of the link coming
up. When it does this, the link will already be up and remain
up. Detect this in the phylink adjust_link callback, and call the
mac_set_eee() callback, rather than running the resolver. This then
avoids violating phylinks guarantee of not calling mac_link_up()
without a corresponding mac_link_down().

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/phy/phylink.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 453f80544792..cf26acc920bd 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1594,10 +1594,13 @@ static void phylink_phy_change(struct phy_device *phydev, bool up)
 {
 	struct phylink *pl = phydev->phylink;
 	bool tx_pause, rx_pause;
+	bool eee_changed;
 
 	phy_get_pause(phydev, &tx_pause, &rx_pause);
 
 	mutex_lock(&pl->state_mutex);
+	eee_changed = (pl->phy_state.link == up);
+
 	pl->phy_state.speed = phydev->speed;
 	pl->phy_state.duplex = phydev->duplex;
 	pl->phy_state.eee_active = phydev->eee_active;
@@ -1609,9 +1612,14 @@ static void phylink_phy_change(struct phy_device *phydev, bool up)
 		pl->phy_state.pause |= MLO_PAUSE_RX;
 	pl->phy_state.interface = phydev->interface;
 	pl->phy_state.link = up;
+
+	if (eee_changed && pl->mac_ops->mac_set_eee)
+		pl->mac_ops->mac_set_eee(pl->config, pl->phy_state.eee_active);
+
 	mutex_unlock(&pl->state_mutex);
 
-	phylink_run_resolve(pl);
+	if (!eee_changed)
+		phylink_run_resolve(pl);
 
 	phylink_dbg(pl, "phy link %s %s/%s/%s/%s/%s/%s\n", up ? "up" : "down",
 		    phy_modes(phydev->interface),
-- 
2.40.0