net: bcmgenet: use MAC link status for fixed phy

When using the fixed PHY with GENET (e.g. MOCA) the PHY link
status can be determined from the internal link status captured
by the MAC. This allows the PHY state machine to use the correct
link state with the fixed PHY even if MAC link event interrupts
are missed when the net device is opened.

Fixes: 8d88c6ebb34c ("net: bcmgenet: enable MoCA link state change detection")
Signed-off-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 11 insertions, 2 deletions

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
index b773bc07edf7..14b49612aa86 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
@@ -186,6 +186,9 @@ struct bcmgenet_mib_counters {
 #define UMAC_MAC1                       0x010
 #define UMAC_MAX_FRAME_LEN              0x014
 
+#define UMAC_MODE                       0x44
+#define  MODE_LINK_STATUS               (1 << 5)
+
 #define UMAC_EEE_CTRL                   0x064
 #define  EN_LPI_RX_PAUSE                (1 << 0)
 #define  EN_LPI_TX_PFC                  (1 << 1)
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 5333274a283c..4241ae928d4a 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -115,8 +115,14 @@ void bcmgenet_mii_setup(struct net_device *dev)
 static int bcmgenet_fixed_phy_link_update(struct net_device *dev,
                                           struct fixed_phy_status *status)
 {
-        if (dev && dev->phydev && status)
-                status->link = dev->phydev->link;
+        struct bcmgenet_priv *priv;
+        u32 reg;
+
+        if (dev && dev->phydev && status) {
+                priv = netdev_priv(dev);
+                reg = bcmgenet_umac_readl(priv, UMAC_MODE);
+                status->link = !!(reg & MODE_LINK_STATUS);
+        }
 
         return 0;
 }