net: bcmgenet: Poll internal PHY for GENETv5

[ Upstream commit 64bd9c8135751b561f27edaaffe93d07093f81af ]

On GENETv5, there is a hardware issue which prevents the GENET hardware
from generating a link UP interrupt when the link is operating at
10Mbits/sec. Since we do not have any way to configure the link
detection logic, fallback to polling in that case.

Fixes: 421380856d9c ("net: bcmgenet: add support for the GENETv5 hardware")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 6ad0ca7ed3e919d0c75f3dd41508f18889523c49..abbd2894f870a34743ef3b4a06efb7eb282640b6 100644 (file)
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -339,9 +339,12 @@ int bcmgenet_mii_probe(struct net_device *dev)
        phydev->advertising = phydev->supported;
 
        /* The internal PHY has its link interrupts routed to the
-        * Ethernet MAC ISRs
-        */
-       if (priv->internal_phy)
+        * Ethernet MAC ISRs. On GENETv5 there is a hardware issue
+        * that prevents the signaling of link UP interrupts when
+        * the link operates at 10Mbps, so fallback to polling for
+        * those versions of GENET.
+        */
+       if (priv->internal_phy && !GENET_IS_V5(priv))
                priv->phydev->irq = PHY_IGNORE_INTERRUPT;
 
        return 0;