net: mvneta: implement pcs_inband_caps() method

Report the PCS in-band capabilities to phylink for Marvell NETA
interfaces.

Reviewed-by: Andrew Lunn <[email protected]>
Signed-off-by: Russell King (Oracle) <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Russell King (Oracle)

drivers/net/ethernet/marvell/mvneta.c

@@ -3960,20 +3960,27 @@ static struct mvneta_port *mvneta_pcs_to_port(struct phylink_pcs *pcs)
 	return container_of(pcs, struct mvneta_port, phylink_pcs);
 }
 
-static int mvneta_pcs_validate(struct phylink_pcs *pcs,
-			       unsigned long *supported,
-			       const struct phylink_link_state *state)
+static unsigned int mvneta_pcs_inband_caps(struct phylink_pcs *pcs,
+					   phy_interface_t interface)
 {
-	/* We only support QSGMII, SGMII, 802.3z and RGMII modes.
-	 * When in 802.3z mode, we must have AN enabled:
+	/* When operating in an 802.3z mode, we must have AN enabled:
 	 * "Bit 2 Field InBandAnEn In-band Auto-Negotiation enable. ...
 	 * When <PortType> = 1 (1000BASE-X) this field must be set to 1."
+	 * Therefore, inband is "required".
 	 */
-	if (phy_interface_mode_is_8023z(state->interface) &&
-	    !phylink_test(state->advertising, Autoneg))
-		return -EINVAL;
+	if (phy_interface_mode_is_8023z(interface))
+		return LINK_INBAND_ENABLE;
 
-	return 0;
+	/* QSGMII, SGMII and RGMII can be configured to use inband
+	 * signalling of the AN result. Indicate these as "possible".
+	 */
+	if (interface == PHY_INTERFACE_MODE_SGMII ||
+	    interface == PHY_INTERFACE_MODE_QSGMII ||
+	    phy_interface_mode_is_rgmii(interface))
+		return LINK_INBAND_DISABLE | LINK_INBAND_ENABLE;
+
+	/* For any other modes, indicate that inband is not supported. */
+	return LINK_INBAND_DISABLE;
 }
 
 static void mvneta_pcs_get_state(struct phylink_pcs *pcs,
@@ -4071,7 +4078,7 @@ static void mvneta_pcs_an_restart(struct phylink_pcs *pcs)
 }
 
 static const struct phylink_pcs_ops mvneta_phylink_pcs_ops = {
-	.pcs_validate = mvneta_pcs_validate,
+	.pcs_inband_caps = mvneta_pcs_inband_caps,
 	.pcs_get_state = mvneta_pcs_get_state,
 	.pcs_config = mvneta_pcs_config,
 	.pcs_an_restart = mvneta_pcs_an_restart,