netdev - [PATCH net] net: ethernet: ave: Fix MAC to be in charge of PHY PM

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Date:   Mon, 24 Oct 2022 16:22:27 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller " <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Subject: [PATCH net] net: ethernet: ave: Fix MAC to be in charge of PHY PM

The phylib callback is called after MAC driver's own resume callback is
called. For AVE driver, after resuming immediately, PHY state machine is
in PHY_NOLINK because there is a time lag from link-down to link-up due to
autoneg. The result is WARN_ON() dump in mdio_bus_phy_resume().

Since ave_resume() itself calls phy_resume(), AVE driver should manage
PHY PM. To indicate that MAC driver manages PHY PM, set
phydev->mac_managed_pm to true to avoid the unnecessary phylib call and
add missing phy_init_hw() to ave_resume().

Suggested-by: Heiner Kallweit <hkallweit1@...il.com>
Fixes: fba863b81604 ("net: phy: make PHY PM ops a no-op if MAC driver manages PHY PM")
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
---
 drivers/net/ethernet/socionext/sni_ave.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/socionext/sni_ave.c b/drivers/net/ethernet/socionext/sni_ave.c
index 1fa09b49ba7f..d2c6a5dfdc0e 100644
--- a/drivers/net/ethernet/socionext/sni_ave.c
+++ b/drivers/net/ethernet/socionext/sni_ave.c
@@ -1229,6 +1229,8 @@ static int ave_init(struct net_device *ndev)
 
 	phy_support_asym_pause(phydev);
 
+	phydev->mac_managed_pm = true;
+
 	phy_attached_info(phydev);
 
 	return 0;
@@ -1756,6 +1758,10 @@ static int ave_resume(struct device *dev)
 
 	ave_global_reset(ndev);
 
+	ret = phy_init_hw(ndev->phydev);
+	if (ret)
+		return ret;
+
 	ave_ethtool_get_wol(ndev, &wol);
 	wol.wolopts = priv->wolopts;
 	__ave_ethtool_set_wol(ndev, &wol);
-- 
2.25.1