net: phy: broadcom: enable EEE LPI feature on BCM54213PE

Call bcm_phy_set_eee() during BCM54213PE config_init to set the
vendor-specific LPI_FEATURE_EN bit (register 0x803d, bit 15).

Without this bit the PHY negotiates EEE via standard C45 registers
but does not forward received LPI from the wire to the RGMII
interface, so the MAC's RX LPI counters remain at zero.

Other Broadcom PHY drivers (bcm-cygnus, bcm7xxx) already call
bcm_phy_set_eee() in their init paths.

Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>

Author: nbuchwitz

drivers/net/phy/broadcom.c

@@ -128,7 +128,17 @@ static int bcm54210e_config_init(struct phy_device *phydev)
 
 static int bcm54213pe_config_init(struct phy_device *phydev)
 {
-	return bcm54210e_config_init(phydev);
+	int err;
+
+	err = bcm54210e_config_init(phydev);
+	if (err)
+		return err;
+
+	/* Enable the PHY's EEE LPI state machine so that received LPI
+	 * is signalled on the RGMII interface.  Without this the MAC
+	 * never sees RX LPI and its counters stay at zero.
+	 */
+	return bcm_phy_set_eee(phydev, true);
 }
 
 static int bcm54612e_config_init(struct phy_device *phydev)