Fix for I217 Packet Loss issue - The Management Engine sets the FEXTNVM4
Beacon Duration incorrectly. This fix ensures that the correct value will
always be set. Correct value for this field is 8 usec.
Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
drivers/net/e1000/base/e1000_ich8lan.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/net/e1000/base/e1000_ich8lan.c
b/drivers/net/e1000/base/e1000_ich8lan.c
index 56e20b4..7b7c631 100644
--- a/drivers/net/e1000/base/e1000_ich8lan.c
+++ b/drivers/net/e1000/base/e1000_ich8lan.c
@@ -1483,6 +1483,20 @@ STATIC s32 e1000_check_for_copper_link_ich8lan(struct
e1000_hw *hw)
return ret_val;
}
+ /* I217 Packet Loss issue:
+ * ensure that FEXTNVM4 Beacon Duration is set correctly
+ * on power up.
+ * Set the Beacon Duration for I217 to 8 usec
+ */
+ if (hw->mac.type == e1000_pch_lpt) {
+ u32 mac_reg;
+
+ mac_reg = E1000_READ_REG(hw, E1000_FEXTNVM4);
+ mac_reg &= ~E1000_FEXTNVM4_BEACON_DURATION_MASK;
+ mac_reg |= E1000_FEXTNVM4_BEACON_DURATION_8USEC;
+ E1000_WRITE_REG(hw, E1000_FEXTNVM4, mac_reg);
+ }
+
/* Work-around I218 hang issue */
if ((hw->device_id == E1000_DEV_ID_PCH_LPTLP_I218_LM) ||
(hw->device_id == E1000_DEV_ID_PCH_LPTLP_I218_V) ||
--
1.9.3
