Commit 0ed013e2 authored by Bruce Allan's avatar Bruce Allan Committed by Jeff Kirsher

e1000e: workaround for packet drop on 82579 at 100Mbps

The MAC can drop short packets when the PHY detects noise on the line at
100Mbps due to a timing issue.  Workaround the issue by increasing the PLL
counter so the PHY properly recognizes the synchronization pattern from the
MAC.
Signed-off-by: default avatarBruce Allan <bruce.w.allan@intel.com>
Tested-by: default avatarJeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 1d2101a7
......@@ -139,6 +139,7 @@
/* PHY Low Power Idle Control */
#define I82579_LPI_CTRL PHY_REG(772, 20)
#define I82579_LPI_CTRL_ENABLE_MASK 0x6000
#define I82579_LPI_CTRL_FORCE_PLL_LOCK_COUNT 0x80
/* EMI Registers */
#define I82579_EMI_ADDR 0x10
......@@ -1670,6 +1671,7 @@ 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)
goto out;
......@@ -1684,12 +1686,19 @@ static s32 e1000_k1_workaround_lv(struct e1000_hw *hw)
mac_reg = er32(FEXTNVM4);
mac_reg &= ~E1000_FEXTNVM4_BEACON_DURATION_MASK;
if (status_reg & HV_M_STATUS_SPEED_1000)
ret_val = e1e_rphy(hw, I82579_LPI_CTRL, &phy_reg);
if (ret_val)
goto out;
if (status_reg & HV_M_STATUS_SPEED_1000) {
mac_reg |= E1000_FEXTNVM4_BEACON_DURATION_8USEC;
else
phy_reg &= ~I82579_LPI_CTRL_FORCE_PLL_LOCK_COUNT;
} else {
mac_reg |= E1000_FEXTNVM4_BEACON_DURATION_16USEC;
phy_reg |= I82579_LPI_CTRL_FORCE_PLL_LOCK_COUNT;
}
ew32(FEXTNVM4, mac_reg);
ret_val = e1e_wphy(hw, I82579_LPI_CTRL, phy_reg);
}
out:
......
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