net: phylink: use pcs_neg_mode in phylink_mac_pcs_get_state()

As in-band AN no longer just depends on MLO_AN_INBAND + Autoneg bit,
we need to take account of the pcs_neg_mode when deciding how to
initialise the speed, duplex and pause state members before calling
into the .pcs_neg_mode() method. Add this.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/E1tXGeO-000Esx-0r@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/phylink.c

@@ -1492,12 +1492,24 @@ static int phylink_change_inband_advert(struct phylink *pl)
 static void phylink_mac_pcs_get_state(struct phylink *pl,
 				      struct phylink_link_state *state)
 {
+	struct phylink_pcs *pcs;
+	bool autoneg;
+
 	linkmode_copy(state->advertising, pl->link_config.advertising);
 	linkmode_zero(state->lp_advertising);
 	state->interface = pl->link_config.interface;
 	state->rate_matching = pl->link_config.rate_matching;
-	if (linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
-			      state->advertising)) {
+	state->an_complete = 0;
+	state->link = 1;
+
+	pcs = pl->pcs;
+	if (!pcs || pcs->neg_mode)
+		autoneg = pl->pcs_neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED;
+	else
+		autoneg = linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+					    state->advertising);
+
+	if (autoneg) {
 		state->speed = SPEED_UNKNOWN;
 		state->duplex = DUPLEX_UNKNOWN;
 		state->pause = MLO_PAUSE_NONE;
@@ -1506,11 +1518,9 @@ static void phylink_mac_pcs_get_state(struct phylink *pl,
 		state->duplex = pl->link_config.duplex;
 		state->pause = pl->link_config.pause;
 	}
-	state->an_complete = 0;
-	state->link = 1;
 
-	if (pl->pcs)
-		pl->pcs->ops->pcs_get_state(pl->pcs, state);
+	if (pcs)
+		pcs->ops->pcs_get_state(pcs, state);
 	else
 		state->link = 0;
 }