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net: lan743x: fix duplex configuration in mac_link_up

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The driver does not explicitly configure the MAC duplex mode when
bringing the link up. As a result, the MAC may retain a stale duplex
setting from a previous link state, leading to duplex mismatches with
the link partner and degraded network performance.

Update lan743x_phylink_mac_link_up() to set or clear the MAC_CR_DPX_
bit according to the negotiated duplex mode.

This ensures the MAC configuration is consistent with the phylink
resolved state.

Fixes: a5f199a8d8 ("net: lan743x: Migrate phylib to phylink")
Signed-off-by: Thangaraj Samynathan <thangaraj.s@microchip.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260323065345.144915-1-thangaraj.s@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Thangaraj Samynathan 2026-03-23 12:23:45 +05:30 committed by Jakub Kicinski
parent ba8bda9a08
commit 7139970787
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/microchip/lan743x_main.c
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@ -3053,6 +3053,11 @@ static void lan743x_phylink_mac_link_up(struct phylink_config *config,
else if (speed == SPEED_100)
mac_cr |= MAC_CR_CFG_L_;
if (duplex == DUPLEX_FULL)
mac_cr |= MAC_CR_DPX_;
else
mac_cr &= ~MAC_CR_DPX_;
lan743x_csr_write(adapter, MAC_CR, mac_cr);
lan743x_ptp_update_latency(adapter, speed);