[Intel-wired-lan] [PATCH 4/5] e1000e: i219 - Increase minimum FIFO read/write min gap

[Yanir Lubetkin]

Due to clocking changes in the Skylake platform, there was Jacksonville
data corruption. To work around this, HW team reported the need
to increase the minimum gap between the phy FIFO read and write pointers.

Signed-off-by: Yanir Lubetkin <yanirx.lubetkin at intel.com>
---
 drivers/net/ethernet/intel/e1000e/ich8lan.c | 46 +++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index af4431d..4ce57e8 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -1438,6 +1438,52 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
 
 		if (ret_val)
 			return ret_val;
+
+		if (hw->mac.type == e1000_pch_spt) {
+			u16 data;
+			u16 ptr_gap;
+
+			if (speed == SPEED_1000) {
+				ret_val = hw->phy.ops.acquire(hw);
+				if (ret_val)
+					return ret_val;
+
+				ret_val = e1e_rphy_locked(hw,
+							  PHY_REG(776, 20),
+							  &data);
+				if (ret_val) {
+					hw->phy.ops.release(hw);
+					return ret_val;
+				}
+
+				ptr_gap = (data & (0x3FF << 2)) >> 2;
+				if (ptr_gap < 0x18) {
+					data &= ~(0x3FF << 2);
+					data |= (0x18 << 2);
+					ret_val =
+					    e1e_wphy_locked(hw,
+							    PHY_REG(776, 20),
+							    data);
+				}
+				hw->phy.ops.release(hw);
+				if (ret_val)
+					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) || (hw->mac.type == e1000_pch_spt)) {
+		u32 mac_reg;
+
+		mac_reg = er32(FEXTNVM4);
+		mac_reg &= ~E1000_FEXTNVM4_BEACON_DURATION_MASK;
+		mac_reg |= E1000_FEXTNVM4_BEACON_DURATION_8USEC;
+		ew32(FEXTNVM4, mac_reg);
 	}
 
 	/* Work-around I218 hang issue */
-- 
2.1.0

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