linux-kernel - [PATCH] net: axienet: Set mac_managed

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Message-Id: <20250217055843.19799-1-nick.hu@sifive.com>
Date: Mon, 17 Feb 2025 13:58:42 +0800
From: Nick Hu <nick.hu@...ive.com>
To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Michal Simek <michal.simek@....com>,
	Russell King <linux@...linux.org.uk>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	Praneeth Bajjuri <praneeth@...com>
Cc: Nick Hu <nick.hu@...ive.com>,
	Andrew Lunn <andrew@...n.ch>,
	netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] net: axienet: Set mac_managed_pm

The external PHY will undergo a soft reset twice during the resume process
when it wake up from suspend. The first reset occurs when the axienet
driver calls phylink_of_phy_connect(), and the second occurs when
mdio_bus_phy_resume() invokes phy_init_hw(). The second soft reset of the
external PHY does not reinitialize the internal PHY, which causes issues
with the internal PHY, resulting in the PHY link being down. To prevent
this, setting the mac_managed_pm flag skips the mdio_bus_phy_resume()
function.

Fixes: a129b41fe0a8 ("Revert "net: phy: dp83867: perform soft reset and retain established link"")
Signed-off-by: Nick Hu <nick.hu@...ive.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 2ffaad0b0477..2deeb982bf6b 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -3078,6 +3078,7 @@ static int axienet_probe(struct platform_device *pdev)
 
 	lp->phylink_config.dev = &ndev->dev;
 	lp->phylink_config.type = PHYLINK_NETDEV;
+	lp->phylink_config.mac_managed_pm = true;
 	lp->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE |
 		MAC_10FD | MAC_100FD | MAC_1000FD;
 
-- 
2.17.1