net: dsa: mt7530: sort link settings ops and force link down on all ports

port_enable and port_disable clears the link settings. Move that to
mt7530_setup() and mt7531_setup_common() which set up the switches. This
way, the link settings are cleared on all ports at setup, and then only
once with phylink_mac_link_down() when a link goes down.

Enable force mode at setup to apply the force part of the link settings.
This ensures that disabled ports will have their link down.
Suggested-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/dsa/mt7530.c

@@ -1018,7 +1018,6 @@ mt7530_port_enable(struct dsa_switch *ds, int port,
 	priv->ports[port].enable = true;
 	mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK,
 		   priv->ports[port].pm);
-	mt7530_clear(priv, MT7530_PMCR_P(port), PMCR_LINK_SETTINGS_MASK);
 
 	mutex_unlock(&priv->reg_mutex);
 
@@ -1038,7 +1037,6 @@ mt7530_port_disable(struct dsa_switch *ds, int port)
 	priv->ports[port].enable = false;
 	mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK,
 		   PCR_MATRIX_CLR);
-	mt7530_clear(priv, MT7530_PMCR_P(port), PMCR_LINK_SETTINGS_MASK);
 
 	mutex_unlock(&priv->reg_mutex);
 }
@@ -2257,6 +2255,12 @@ mt7530_setup(struct dsa_switch *ds)
 	mt7530_mib_reset(ds);
 
 	for (i = 0; i < MT7530_NUM_PORTS; i++) {
+		/* Clear link settings and enable force mode to force link down
+		 * on all ports until they're enabled later.
+		 */
+		mt7530_rmw(priv, MT7530_PMCR_P(i), PMCR_LINK_SETTINGS_MASK |
+			   PMCR_FORCE_MODE, PMCR_FORCE_MODE);
+
 		/* Disable forwarding by default on all ports */
 		mt7530_rmw(priv, MT7530_PCR_P(i), PCR_MATRIX_MASK,
 			   PCR_MATRIX_CLR);
@@ -2359,6 +2363,12 @@ mt7531_setup_common(struct dsa_switch *ds)
 		     UNU_FFP_MASK);
 
 	for (i = 0; i < MT7530_NUM_PORTS; i++) {
+		/* Clear link settings and enable force mode to force link down
+		 * on all ports until they're enabled later.
+		 */
+		mt7530_rmw(priv, MT7530_PMCR_P(i), PMCR_LINK_SETTINGS_MASK |
+			   MT7531_FORCE_MODE, MT7531_FORCE_MODE);
+
 		/* Disable forwarding by default on all ports */
 		mt7530_rmw(priv, MT7530_PCR_P(i), PCR_MATRIX_MASK,
 			   PCR_MATRIX_CLR);