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Commit 93cbfc70 authored by Yanir Lubetkin's avatar Yanir Lubetkin Committed by Jeff Kirsher
Browse files

e1000e: i219 - Increase minimum FIFO read/write min gap 



Due to clocking changes in the Skylake platform, there was i219
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: default avatarYanir Lubetkin <yanirx.lubetkin@intel.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 69cfbc95

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

+46 −0
Original line number Original line Diff line number Diff line
@@ -1437,6 +1437,52 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw) 




		if (ret_val)

		if (ret_val)

			return 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 */

	/* Work-around I218 hang issue */