e1000e: Workaround for dropped packets in Gig/100 speeds on 82579

This is a workaround for a HW erratum on 82579 devices.
Erratum is #23 in Intel 6 Series Chipset and Intel C200 Series Chipset
specification Update June 2013.

Problem: 82579 parts experience packet loss in Gig and 100 speeds
when interconnect between PHY and MAC is exiting K1 power saving state.
This was previously believed to only affect 1Gig speed, but has been observed
at 100Mbs also.

Workaround: Disable K1 for 82579 devices at Gig and 100 speeds.

Signed-off-by: Dave Ertman <davidx.m.ertman@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/ich8lan.c

@@ -2493,51 +2493,44 @@ release:
  *  e1000_k1_gig_workaround_lv - K1 Si workaround
  *  @hw:   pointer to the HW structure
  *
- *  Workaround to set the K1 beacon duration for 82579 parts
+ *  Workaround to set the K1 beacon duration for 82579 parts in 10Mbps
+ *  Disable K1 in 1000Mbps and 100Mbps
  **/
 static s32 e1000_k1_workaround_lv(struct e1000_hw *hw)
 {
 	s32 ret_val = 0;
 	u16 status_reg = 0;
-	u32 mac_reg;
-	u16 phy_reg;
 
 	if (hw->mac.type != e1000_pch2lan)
 		return 0;
 
-	/* Set K1 beacon duration based on 1Gbps speed or otherwise */
+	/* Set K1 beacon duration based on 10Mbs speed */
 	ret_val = e1e_rphy(hw, HV_M_STATUS, &status_reg);
 	if (ret_val)
 		return ret_val;
 
 	if ((status_reg & (HV_M_STATUS_LINK_UP | HV_M_STATUS_AUTONEG_COMPLETE))
 	    == (HV_M_STATUS_LINK_UP | HV_M_STATUS_AUTONEG_COMPLETE)) {
-		mac_reg = er32(FEXTNVM4);
-		mac_reg &= ~E1000_FEXTNVM4_BEACON_DURATION_MASK;
-
-		ret_val = e1e_rphy(hw, I82579_LPI_CTRL, &phy_reg);
-		if (ret_val)
-			return ret_val;
-
-		if (status_reg & HV_M_STATUS_SPEED_1000) {
+		if (status_reg &
+		    (HV_M_STATUS_SPEED_1000 | HV_M_STATUS_SPEED_100)) {
 			u16 pm_phy_reg;
 
-			mac_reg |= E1000_FEXTNVM4_BEACON_DURATION_8USEC;
-			phy_reg &= ~I82579_LPI_CTRL_FORCE_PLL_LOCK_COUNT;
-			/* LV 1G Packet drop issue wa  */
+			/* LV 1G/100 Packet drop issue wa  */
 			ret_val = e1e_rphy(hw, HV_PM_CTRL, &pm_phy_reg);
 			if (ret_val)
 				return ret_val;
-			pm_phy_reg &= ~HV_PM_CTRL_PLL_STOP_IN_K1_GIGA;
+			pm_phy_reg &= ~HV_PM_CTRL_K1_ENABLE;
 			ret_val = e1e_wphy(hw, HV_PM_CTRL, pm_phy_reg);
 			if (ret_val)
 				return ret_val;
 		} else {
+			u32 mac_reg;
+
+			mac_reg = er32(FEXTNVM4);
+			mac_reg &= ~E1000_FEXTNVM4_BEACON_DURATION_MASK;
 			mac_reg |= E1000_FEXTNVM4_BEACON_DURATION_16USEC;
-			phy_reg |= I82579_LPI_CTRL_FORCE_PLL_LOCK_COUNT;
+			ew32(FEXTNVM4, mac_reg);
 		}
-		ew32(FEXTNVM4, mac_reg);
-		ret_val = e1e_wphy(hw, I82579_LPI_CTRL, phy_reg);
 	}
 
 	return ret_val;