[Intel-wired-lan] [PATCH 4/5] e1000e: fix unit hang during loopback test

[Yanir Lubetkin]

system would hang during execution of "ethtool -t <NIC>" for the same
reason that required flushing the descriptor rings. this fix disables
MULR for the loopback test to avoid the hang state.

Signed-off-by: Yanir Lubetkin <yanirx.lubetkin at intel.com>
---
 drivers/net/ethernet/intel/e1000e/ethtool.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 11f486e..9fe5f0f 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -1516,8 +1516,17 @@ static int e1000_set_es2lan_mac_loopback(struct e1000_adapter *adapter)
 static int e1000_setup_loopback_test(struct e1000_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
-	u32 rctl;
-
+	u32 rctl, fext_nvm11, tarc0;
+ 
+	if (hw->mac.type == e1000_pch_spt) {
+		fext_nvm11 = er32(FEXTNVM11);
+		fext_nvm11 |= E1000_FEXTNVM11_DISABLE_MULR_FIX;
+		ew32(FEXTNVM11, fext_nvm11);
+		tarc0 = er32(TARC(0));
+		tarc0 &= 0xcfffffff;
+		tarc0 |= 0x20000000;
+		ew32(TARC(0), tarc0);
+	}
 	if (hw->phy.media_type == e1000_media_type_fiber ||
 	    hw->phy.media_type == e1000_media_type_internal_serdes) {
 		switch (hw->mac.type) {
@@ -1542,7 +1551,7 @@ static int e1000_setup_loopback_test(struct e1000_adapter *adapter)
 static void e1000_loopback_cleanup(struct e1000_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
-	u32 rctl;
+	u32 rctl, fext_nvm11, tarc0;
 	u16 phy_reg;
 
 	rctl = er32(RCTL);
@@ -1550,6 +1559,14 @@ static void e1000_loopback_cleanup(struct e1000_adapter *adapter)
 	ew32(RCTL, rctl);
 
 	switch (hw->mac.type) {
+	case e1000_pch_spt:
+		fext_nvm11 = er32(FEXTNVM11);
+		fext_nvm11 &= ~E1000_FEXTNVM11_DISABLE_MULR_FIX;
+		ew32(FEXTNVM11, fext_nvm11);
+		tarc0 = er32(TARC(0));
+		tarc0 &= 0xcfffffff;
+		ew32(TARC(0), tarc0);
+		/* fall through */
 	case e1000_80003es2lan:
 		if (hw->phy.media_type == e1000_media_type_fiber ||
 		    hw->phy.media_type == e1000_media_type_internal_serdes) {
-- 
2.1.0

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