tg3: Disable EEE during loopback tests

EEE interferes with the hardware's ability to loop a packet back to the
host.  This patch disables the feature for the duration of the test.

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

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index f52466d..c333481 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -11013,14 +11013,19 @@ out:
 static int tg3_test_loopback(struct tg3 *tp)
 {
        int err = 0;
-       u32 cpmuctrl = 0;
+       u32 eee_cap, cpmuctrl = 0;
 
        if (!netif_running(tp->dev))
                return TG3_LOOPBACK_FAILED;
 
+       eee_cap = tp->phy_flags & TG3_PHYFLG_EEE_CAP;
+       tp->phy_flags &= ~TG3_PHYFLG_EEE_CAP;
+
        err = tg3_reset_hw(tp, 1);
-       if (err)
-               return TG3_LOOPBACK_FAILED;
+       if (err) {
+               err = TG3_LOOPBACK_FAILED;
+               goto done;
+       }
 
        /* Turn off gphy autopowerdown. */
        if (tp->phy_flags & TG3_PHYFLG_ENABLE_APD)
@@ -11040,8 +11045,10 @@ static int tg3_test_loopback(struct tg3 *tp)
                        udelay(10);
                }
 
-               if (status != CPMU_MUTEX_GNT_DRIVER)
-                       return TG3_LOOPBACK_FAILED;
+               if (status != CPMU_MUTEX_GNT_DRIVER) {
+                       err = TG3_LOOPBACK_FAILED;
+                       goto done;
+               }
 
                /* Turn off link-based power management. */
                cpmuctrl = tr32(TG3_CPMU_CTRL);
@@ -11070,6 +11077,9 @@ static int tg3_test_loopback(struct tg3 *tp)
        if (tp->phy_flags & TG3_PHYFLG_ENABLE_APD)
                tg3_phy_toggle_apd(tp, true);
 
+done:
+       tp->phy_flags |= eee_cap;
+
        return err;
 }