net: systemport: Avoid RBUF stuck in Wake-on-LAN mode

After a number of suspend and resume cycles, it is possible for the RBUF
to be stuck in Wake-on-LAN mode, despite the MPD enable bit being
cleared which instructed the RBUF to exit that mode.

Avoid creating that problematic condition by clearing the RX_EN and
TX_EN bits in the UniMAC prior to disable the Magic Packet Detector
logic which is guaranteed to make the RBUF exit Wake-on-LAN mode.

Fixes: 83e82f4c706b ("net: systemport: add Wake-on-LAN support")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index f07ac0e..e0611cb 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -2736,6 +2736,9 @@ static int __maybe_unused bcm_sysport_resume(struct device *d)
 
        umac_reset(priv);
 
+       /* Disable the UniMAC RX/TX */
+       umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 0);
+
        /* We may have been suspended and never received a WOL event that
         * would turn off MPD detection, take care of that now
         */