net: bcmgenet: Poll internal PHY for GENETv5

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>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 4241ae928d4a..34af5f1569c8 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -321,9 +321,12 @@ 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
+         * 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)
+        if (priv->internal_phy && !GENET_IS_V5(priv))
                 dev->phydev->irq = PHY_IGNORE_INTERRUPT;
 
         return 0;