linux-kernel - [PATCH net] net: phy: dp83869: Fix MII mode failure

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Message-ID: <20240423084828.1309294-1-danishanwar@ti.com>
Date: Tue, 23 Apr 2024 14:18:28 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Siddharth Vadapalli <s-vadapalli@...com>, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
        "David
 S. Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>, Andrew Lunn <andrew@...n.ch>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <srk@...com>,
        Vignesh Raghavendra <vigneshr@...com>, <r-gunasekaran@...com>,
        Roger Quadros
	<rogerq@...nel.org>,
        MD Danish Anwar <danishanwar@...com>
Subject: [PATCH net] net: phy: dp83869: Fix MII mode failure

The DP83869 driver sets the MII bit (needed for PHY to work in MII mode)
only if the op-mode is either DP83869_100M_MEDIA_CONVERT or
DP83869_RGMII_100_BASE.

Some drivers i.e. ICSSG support MII mode with op-mode as
DP83869_RGMII_COPPER_ETHERNET for which the MII bit is not set in dp83869
driver. As a result MII mode on ICSSG doesn't work and below log is seen.

TI DP83869 300b2400.mdio:0f: selected op-mode is not valid with MII mode
icssg-prueth icssg1-eth: couldn't connect to phy ethernet-phy@0
icssg-prueth icssg1-eth: can't phy connect port MII0

Fix this by setting MII bit for DP83869_RGMII_COPPER_ETHERNET op-mode as
well.

Fixes: 94e86ef1b801 ("net: phy: dp83869: support mii mode when rgmii strap cfg is used")
Signed-off-by: MD Danish Anwar <danishanwar@...com>
---
NOTE: This patch is needed for MII mode to work for ICSSG Ethernet driver.
I will post the device tree patch for MII mode and mark that as dependent
on this patch.

 drivers/net/phy/dp83869.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
index fa8c6fdcf301..d7aaefb5226b 100644
--- a/drivers/net/phy/dp83869.c
+++ b/drivers/net/phy/dp83869.c
@@ -695,7 +695,8 @@ static int dp83869_configure_mode(struct phy_device *phydev,
 	phy_ctrl_val = dp83869->mode;
 	if (phydev->interface == PHY_INTERFACE_MODE_MII) {
 		if (dp83869->mode == DP83869_100M_MEDIA_CONVERT ||
-		    dp83869->mode == DP83869_RGMII_100_BASE) {
+		    dp83869->mode == DP83869_RGMII_100_BASE ||
+		    dp83869->mode == DP83869_RGMII_COPPER_ETHERNET) {
 			phy_ctrl_val |= DP83869_OP_MODE_MII;
 		} else {
 			phydev_err(phydev, "selected op-mode is not valid with MII mode\n");

base-commit: 6bea4f03c6a4e973ef369e15aac88f37981db49e
-- 
2.34.1