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.

(cherry picked from commit 085f1afc56619bda424941412fdeaff1e32c21dc)
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>
Signed-off-by: Joe Jin <joe.jin@oracle.com>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index eb639b245c63fb2c718a174165971c121d22d182..cb0db80b1c9f7518572fda1f8f59a3400747d414 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -2783,7 +2783,9 @@ 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 ||