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: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index c2ea861..8b6ecd1 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -1122,6 +1122,7 @@
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 @@
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;
}
