netdev - [PATCH net-next v2 5/7] net: tn40xx: prepare tn40xx driver to find phy of the TN9510 card

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Message-ID: <trinity-a908f45c-9600-475b-a182-f34055ffd4a6-1726430720847@3c-app-gmx-bap07>
Date: Sun, 15 Sep 2024 22:05:20 +0200
From: Hans-Frieder Vogt <hfdevel@....net>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, FUJITA Tomonori
 <fujita.tomonori@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2 5/7] net: tn40xx: prepare tn40xx driver to find
 phy of the TN9510 card

Prepare the tn40xx driver to load for Tehuti TN9510 cards, which require
bit 3 in the register TN40_REG_MDIO_CMD_STAT to be set.
The function of bit 3 is unclear, but may have something to do with the
length of the preamble in the MDIO communication. If bit 3 is not set, the
PHY will not be found when performing a scan for PHYs. Use the available
tn40_mdio_set_speed funtion which includes setting bit 3.

Signed-off-by: Hans-Frieder Vogt <hfdevel@....net>
---
 drivers/net/ethernet/tehuti/tn40_mdio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/tehuti/tn40_mdio.c b/drivers/net/ethernet/tehuti/tn40_mdio.c
index b8ee553f60d1..80eb68384389 100644
--- a/drivers/net/ethernet/tehuti/tn40_mdio.c
+++ b/drivers/net/ethernet/tehuti/tn40_mdio.c
@@ -185,6 +185,7 @@ int tn40_mdiobus_init(struct tn40_priv *priv)
 			ret);
 	}

+	tn40_mdio_set_speed(priv, TN40_MDIO_SPEED_1MHZ);
 	ret = devm_mdiobus_register(&pdev->dev, bus);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register mdiobus %d %u %u\n",
--
2.45.2