net: bcmgenet: Poll internal PHY for GENETv5

BugLink: https://bugs.launchpad.net/bugs/1836654
[ 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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 4241ae928d4abb4f61d39344e93d08603a2d2c86..34af5f1569c8f4105d3cf36789eefdb0d63509dc 100644 (file)
--- 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;