net: stmmac/xpcs: convert to pcs_validate()

stmmac explicitly calls the xpcs driver to validate the ethtool
linkmodes. This is no longer necessary as phylink now supports
validation through a PCS method. Convert both drivers to use this
new mechanism.

Tested-by: Wong Vee Khee <vee.khee.wong@linux.intel.com> # Intel EHL
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -940,7 +940,6 @@ static void stmmac_validate(struct phylink_config *config,
 			    unsigned long *supported,
 			    struct phylink_link_state *state)
 {
-	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(mac_supported) = { 0, };
 
 	/* This is very similar to phylink_generic_validate() except that
@@ -958,10 +957,6 @@ static void stmmac_validate(struct phylink_config *config,
 
 	linkmode_and(supported, supported, mac_supported);
 	linkmode_and(state->advertising, state->advertising, mac_supported);
-
-	/* If PCS is supported, check which modes it supports. */
-	if (priv->hw->xpcs)
-		xpcs_validate(priv->hw->xpcs, supported, state);
 }
 
 static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,

drivers/net/pcs/pcs-xpcs.c

@@ -632,35 +632,29 @@ static void xpcs_resolve_pma(struct dw_xpcs *xpcs,
 	}
 }
 
-void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
-		   struct phylink_link_state *state)
+static int xpcs_validate(struct phylink_pcs *pcs, unsigned long *supported,
+			 const struct phylink_link_state *state)
 {
-	__ETHTOOL_DECLARE_LINK_MODE_MASK(xpcs_supported);
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(xpcs_supported) = { 0, };
 	const struct xpcs_compat *compat;
+	struct dw_xpcs *xpcs;
 	int i;
 
-	/* phylink expects us to report all supported modes with
-	 * PHY_INTERFACE_MODE_NA, just don't limit the supported and
-	 * advertising masks and exit.
-	 */
-	if (state->interface == PHY_INTERFACE_MODE_NA)
-		return;
-
-	linkmode_zero(xpcs_supported);
-
+	xpcs = phylink_pcs_to_xpcs(pcs);
 	compat = xpcs_find_compat(xpcs->id, state->interface);
 
-	/* Populate the supported link modes for this
-	 * PHY interface type
+	/* Populate the supported link modes for this PHY interface type.
+	 * FIXME: what about the port modes and autoneg bit? This masks
+	 * all those away.
 	 */
 	if (compat)
 		for (i = 0; compat->supported[i] != __ETHTOOL_LINK_MODE_MASK_NBITS; i++)
 			set_bit(compat->supported[i], xpcs_supported);
 
 	linkmode_and(supported, supported, xpcs_supported);
-	linkmode_and(state->advertising, state->advertising, xpcs_supported);
+
+	return 0;
 }
-EXPORT_SYMBOL_GPL(xpcs_validate);
 
 void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces)
 {
@@ -1120,6 +1114,7 @@ static const struct xpcs_id xpcs_id_list[] = {
 };
 
 static const struct phylink_pcs_ops xpcs_phylink_ops = {
+	.pcs_validate = xpcs_validate,
 	.pcs_config = xpcs_config,
 	.pcs_get_state = xpcs_get_state,
 	.pcs_link_up = xpcs_link_up,

include/linux/pcs/pcs-xpcs.h

@@ -31,8 +31,6 @@ void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 		  phy_interface_t interface, int speed, int duplex);
 int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		   unsigned int mode);
-void xpcs_validate(struct dw_xpcs *xpcs, unsigned long *supported,
-		   struct phylink_link_state *state);
 void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces);
 int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
 		    int enable);