linux-kernel - [PATCH net-next 1/3] net: phy: dp83869: Restart PHY when configuring mode

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Message-Id: <20250514-dp83869-1000basex-v1-1-1bdb3c9c3d63@bootlin.com>
Date: Wed, 14 May 2025 09:49:57 +0200
From: Romain Gantois <romain.gantois@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH net-next 1/3] net: phy: dp83869: Restart PHY when
 configuring mode

According to the DP83869 PHY datasheet, a software restart is required at
the end of every operational mode configuration. This resets all of the
PHY's circuits except the registers in the register file.

The DP83869 driver currently does not perform this restart operation, which
could theoretically cause issues if the PHY is in an intermediary state
when the operational mode is changed.

Add this software restart operation to dp83869_configure_mode().

Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
---
 drivers/net/phy/dp83869.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
index a62cd838a9eacc9edb0f472470a63079b6b72207..010434c94e01f44ac3c0b7e147468f4f7dca33f4 100644
--- a/drivers/net/phy/dp83869.c
+++ b/drivers/net/phy/dp83869.c
@@ -798,6 +798,10 @@ static int dp83869_configure_mode(struct phy_device *phydev,
 		return -EINVAL;
 	}

+	ret = phy_write(phydev, DP83869_CTRL, DP83869_SW_RESTART);
+
+	usleep_range(10, 20);
+
 	return ret;
 }

-- 
2.49.0