net: mtk_eth_soc: add out of band forcing of speed and duplex in pcs_link_up

Add support for forcing the link speed and duplex setting in the
pcs_link_up() method for out of band modes, which will be useful when
we finish converting the pcs_config() method. Until then, we still have
to force duplex for 802.3z modes to work correctly.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mediatek/mtk_sgmii.c

@@ -108,17 +108,23 @@ static void mtk_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 	struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
 	unsigned int sgm_mode;
 
-	if (!phy_interface_mode_is_8023z(interface))
-		return;
+	if (!phylink_autoneg_inband(mode) ||
+	    phy_interface_mode_is_8023z(interface)) {
+		/* Force the speed and duplex setting */
+		if (speed == SPEED_10)
+			sgm_mode = SGMII_SPEED_10;
+		else if (speed == SPEED_100)
+			sgm_mode = SGMII_SPEED_100;
+		else
+			sgm_mode = SGMII_SPEED_1000;
 
-	/* SGMII force duplex setting */
 		if (duplex == DUPLEX_FULL)
-		sgm_mode = SGMII_DUPLEX_FULL;
-	else
-		sgm_mode = 0;
+			sgm_mode |= SGMII_DUPLEX_FULL;
 
 		regmap_update_bits(mpcs->regmap, SGMSYS_SGMII_MODE,
-			   SGMII_DUPLEX_FULL, sgm_mode);
+				   SGMII_DUPLEX_FULL | SGMII_SPEED_MASK,
+				   sgm_mode);
+	}
 }
 
 static const struct phylink_pcs_ops mtk_pcs_ops = {