From 84383b5ef4cd21b4a67de92afdc05a03b5247db9 Mon Sep 17 00:00:00 2001
From: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
Date: Thu, 25 Jul 2024 12:41:25 +0530
Subject: [PATCH] net: phy: micrel: Fix the KSZ9131 MDI-X status issue
The MDIX status is not accurately reflecting the current state after the link
partner has manually altered its MDIX configuration while operating in forced
mode.
Access information about Auto mdix completion and pair selection from the
KSZ9131's Auto/MDI/MDI-X status register
Fixes: b64e6a8794d9 ("net: phy: micrel: Add PHY Auto/MDI/MDI-X set driver for KSZ9131")
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20240725071125.13960-1-Raju.Lakkaraju@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/phy/micrel.c | 34 +++++++++++++++++++---------------
1 file changed, 19 insertions(+), 15 deletions(-)
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index dd519805deee3..65b0a3115e14c 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1389,6 +1389,8 @@ static int ksz9131_config_init(struct phy_device *phydev)
const struct device *dev_walker;
int ret;
+ phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+
dev_walker = &phydev->mdio.dev;
do {
of_node = dev_walker->of_node;
@@ -1438,28 +1440,30 @@ static int ksz9131_config_init(struct phy_device *phydev)
#define MII_KSZ9131_AUTO_MDIX 0x1C
#define MII_KSZ9131_AUTO_MDI_SET BIT(7)
#define MII_KSZ9131_AUTO_MDIX_SWAP_OFF BIT(6)
+#define MII_KSZ9131_DIG_AXAN_STS 0x14
+#define MII_KSZ9131_DIG_AXAN_STS_LINK_DET BIT(14)
+#define MII_KSZ9131_DIG_AXAN_STS_A_SELECT BIT(12)
static int ksz9131_mdix_update(struct phy_device *phydev)
{
int ret;
- ret = phy_read(phydev, MII_KSZ9131_AUTO_MDIX);
- if (ret < 0)
- return ret;
-
- if (ret & MII_KSZ9131_AUTO_MDIX_SWAP_OFF) {
- if (ret & MII_KSZ9131_AUTO_MDI_SET)
- phydev->mdix_ctrl = ETH_TP_MDI;
- else
- phydev->mdix_ctrl = ETH_TP_MDI_X;
+ if (phydev->mdix_ctrl != ETH_TP_MDI_AUTO) {
+ phydev->mdix = phydev->mdix_ctrl;
} else {
- phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
- }
+ ret = phy_read(phydev, MII_KSZ9131_DIG_AXAN_STS);
+ if (ret < 0)
+ return ret;
- if (ret & MII_KSZ9131_AUTO_MDI_SET)
- phydev->mdix = ETH_TP_MDI;
- else
- phydev->mdix = ETH_TP_MDI_X;
+ if (ret & MII_KSZ9131_DIG_AXAN_STS_LINK_DET) {
+ if (ret & MII_KSZ9131_DIG_AXAN_STS_A_SELECT)
+ phydev->mdix = ETH_TP_MDI;
+ else
+ phydev->mdix = ETH_TP_MDI_X;
+ } else {
+ phydev->mdix = ETH_TP_MDI_INVALID;
+ }
+ }
return 0;
}
--
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