Hi Maxime,  fc81e257d19f ("net: phy: phy_caps: Allow looking-up link caps based on speed and duplex") might have different behavior than the modification.
My case is set 10M Half with disable autoneg both sides and I expect it is
link in 10M Half. But now, it is link in 10M Full，which is not what I
expect.

I used followed command and trace how phy worked.
	ethtool -s eth1 autoneg off speed 10 duplex half
The log is showed as followed:
ethtool-13127	[067]	6164.771853: phy_ethtool_ksettings set: (phy_ethtool ksettings set+0x0/0x200) duplex=0 speed=10
kworker/u322:2-11096	[070]	6164.771853:	_phy_start_aneq: ( _phy_start_aneg+0x0/0xb8) duplex=0 speed=10
kworker/u322:2-11096	[070]	6164.771854:	phy_caps_lookup: (phy_caps_lookup+0x0/0xf0) duplex=0 speed=10
kworker/u322:2-11096	[070]	6164.771855:	phy_config_aneg: (phy_config_aneg+0x0/0x70) duplex=1 speed=10
kworker/u322:2-11096	[070]	6164.771856:	genphy_config_aneg:	(__genphy_config_aneg+0X0/0X270) duplex=1 speed=10

I also try to fixed it and it works. Do you have any idea about it.

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 0e762fc3a529..2986c41c42a8 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c

@@ -258,7 +258,7 @@ static void phy_sanitize_settings(struct phy_device *phydev)
        const struct link_capabilities *c;

        c = phy_caps_lookup(phydev->speed, phydev->duplex, phydev->supported,
-                           false);
+                           true);