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Commit baf86c9d authored by Bruce Allan's avatar Bruce Allan Committed by David S. Miller
Browse files

e1000e: workaround link issues on busy hub in half duplex on 82577/82578 



This patch removes a delay in hardware after every received packet allowing
more time for transmitted packets to go out in between received packets in
half duplex.

Signed-off-by: default avatarBruce Allan <bruce.w.allan@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fddaa1af

drivers/net/e1000e/ich8lan.c

+18 −1
Original line number Diff line number Diff line
@@ -1122,6 +1122,7 @@ static s32 e1000_set_mdio_slow_mode_hv(struct e1000_hw *hw) 
static s32 e1000_hv_phy_workarounds_ich8lan(struct e1000_hw *hw)

{

	s32 ret_val = 0;

	u16 phy_data;



	if (hw->mac.type != e1000_pchlan)

		return ret_val;
@@ -1165,16 +1166,32 @@ static s32 e1000_hv_phy_workarounds_ich8lan(struct e1000_hw *hw) 


	hw->phy.addr = 1;

	ret_val = e1000e_write_phy_reg_mdic(hw, IGP01E1000_PHY_PAGE_SELECT, 0);

	hw->phy.ops.release(hw);

	if (ret_val)

		goto out;

	hw->phy.ops.release(hw);



	/*

	 * Configure the K1 Si workaround during phy reset assuming there is

	 * link so that it disables K1 if link is in 1Gbps.

	 */

	ret_val = e1000_k1_gig_workaround_hv(hw, true);

	if (ret_val)

		goto out;



	/* Workaround for link disconnects on a busy hub in half duplex */

	ret_val = hw->phy.ops.acquire(hw);

	if (ret_val)

		goto out;

	ret_val = hw->phy.ops.read_reg_locked(hw,

	                                      PHY_REG(BM_PORT_CTRL_PAGE, 17),

	                                      &phy_data);

	if (ret_val)

		goto release;

	ret_val = hw->phy.ops.write_reg_locked(hw,

	                                       PHY_REG(BM_PORT_CTRL_PAGE, 17),

	                                       phy_data & 0x00FF);

release:

	hw->phy.ops.release(hw);

out:

	return ret_val;

}