5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Oleksij Rempel o.rempel@pengutronix.de
[ Upstream commit a141af8eb2272ab0f677a7f2653874840bc9b214 ]
Correct the Auto-MDIX configuration to ensure userspace settings are respected when the feature is disabled by the AUTOMDIX_EN hardware strap.
The LAN9500 PHY allows its default MDI-X mode to be configured via a hardware strap. If this strap sets the default to "MDI-X off", the driver was previously unable to enable Auto-MDIX from userspace.
When handling the ETH_TP_MDI_AUTO case, the driver would set the SPECIAL_CTRL_STS_AMDIX_ENABLE_ bit but neglected to set the required SPECIAL_CTRL_STS_OVRRD_AMDIX_ bit. Without the override flag, the PHY falls back to its hardware strap default, ignoring the software request.
This patch corrects the behavior by also setting the override bit when enabling Auto-MDIX. This ensures that the userspace configuration takes precedence over the hardware strap, allowing Auto-MDIX to be enabled correctly in all scenarios.
Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support") Signed-off-by: Oleksij Rempel o.rempel@pengutronix.de Cc: Andre Edich andre.edich@microchip.com Reviewed-by: Maxime Chevallier maxime.chevallier@bootlin.com Link: https://patch.msgid.link/20250703114941.3243890-2-o.rempel@pengutronix.de Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/phy/smsc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c index 36dcf6c7f445d..6d9069a53db1d 100644 --- a/drivers/net/phy/smsc.c +++ b/drivers/net/phy/smsc.c @@ -155,7 +155,8 @@ static int lan87xx_config_aneg(struct phy_device *phydev) SPECIAL_CTRL_STS_AMDIX_STATE_; break; case ETH_TP_MDI_AUTO: - val = SPECIAL_CTRL_STS_AMDIX_ENABLE_; + val = SPECIAL_CTRL_STS_OVRRD_AMDIX_ | + SPECIAL_CTRL_STS_AMDIX_ENABLE_; break; default: return genphy_config_aneg(phydev);