tg3: Fix 5717 serdes powerdown problem

If port 0 of a 5717 serdes device powers down, it hides the phy from
port 1.  This patch works around the problem by keeping port 0's phy
powered up.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 7b71387cf93c..d2ff8ee39e84 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -2779,7 +2779,9 @@ static void tg3_power_down_phy(struct tg3 *tp, bool do_low_power)
         if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5700 ||
             GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5704 ||
             (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5780 &&
-             (tp->phy_flags & TG3_PHYFLG_MII_SERDES)))
+             (tp->phy_flags & TG3_PHYFLG_MII_SERDES)) ||
+            (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 &&
+             !tp->pci_fn))
                 return;
 
         if (GET_CHIP_REV(tp->pci_chip_rev_id) == CHIPREV_5784_AX ||