1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index 0890162953e9..25f6bc94e69b 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -980,6 +980,18 @@ static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw)
                 reg |= E1000_PBA_ECC_CORR_EN;
                 ew32(PBA_ECC, reg);
         }
+        /*
+         * Workaround for hardware errata.
+         * Ensure that DMA Dynamic Clock gating is disabled on 82571 and 82572
+         */
+
+        if ((hw->mac.type == e1000_82571) ||
+           (hw->mac.type == e1000_82572)) {
+                reg = er32(CTRL_EXT);
+                reg &= ~E1000_CTRL_EXT_DMA_DYN_CLK_EN;
+                ew32(CTRL_EXT, reg);
+        }
+
 
         /* PCI-Ex Control Registers */
         if (hw->mac.type == e1000_82574) {