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| author | Bruce Allan <bruce.w.allan@intel.com> | 2011-07-29 05:52:56 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2011-08-13 02:12:31 -0700 |
| commit | 0ed013e28fe853244f4972cf18d8e2bd62eeb8fc (patch) | |
| tree | 959d4fef12aaaad7919261d22b90698c1658b027 | |
| parent | 1d2101a712b3b7281a19ff6d7bfc16c2ce9d3998 (diff) | |
| download | linux-0ed013e28fe853244f4972cf18d8e2bd62eeb8fc.tar.gz linux-0ed013e28fe853244f4972cf18d8e2bd62eeb8fc.tar.bz2 linux-0ed013e28fe853244f4972cf18d8e2bd62eeb8fc.zip | |
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: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
| -rw-r--r-- | drivers/net/e1000e/ich8lan.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c index 7525e372720c..46a5277dc1db 100644 --- a/drivers/net/e1000e/ich8lan.c +++ b/drivers/net/e1000e/ich8lan.c @@ -137,8 +137,9 @@ #define HV_PM_CTRL PHY_REG(770, 17) /* PHY Low Power Idle Control */ -#define I82579_LPI_CTRL PHY_REG(772, 20) -#define I82579_LPI_CTRL_ENABLE_MASK 0x6000 +#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: |