diff options
| author | Bruce Allan <bruce.w.allan@intel.com> | 2011-02-25 06:58:03 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2011-03-11 02:05:26 -0800 |
| commit | 1effb45cca29e22e4b2209bb567770b7e20a3a2b (patch) | |
| tree | 32ea3837ac121d6d5777b673aa5ea8204134c1c2 /drivers | |
| parent | 5661aeb08edcef6799861f92817f593c1fd7b272 (diff) | |
| download | linux-1effb45cca29e22e4b2209bb567770b7e20a3a2b.tar.bz2 | |
e1000e: extend EEE LPI timer to prevent dropped link
The link can be unexpectedly dropped when the timer for entering EEE low-
power-idle quiet state expires too soon. The timer needs to be extended
from 196usec to 200usec after every LCD (PHY) reset to prevent this from
happening.
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/e1000e/ich8lan.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c index 232b42b7f7ce..cf18d65417e6 100644 --- a/drivers/net/e1000e/ich8lan.c +++ b/drivers/net/e1000e/ich8lan.c @@ -140,6 +140,11 @@ #define I82579_LPI_CTRL PHY_REG(772, 20) #define I82579_LPI_CTRL_ENABLE_MASK 0x6000 +/* EMI Registers */ +#define I82579_EMI_ADDR 0x10 +#define I82579_EMI_DATA 0x11 +#define I82579_LPI_UPDATE_TIMER 0x4805 /* in 40ns units + 40 ns base value */ + /* Strapping Option Register - RO */ #define E1000_STRAP 0x0000C #define E1000_STRAP_SMBUS_ADDRESS_MASK 0x00FE0000 @@ -1723,11 +1728,25 @@ static s32 e1000_post_phy_reset_ich8lan(struct e1000_hw *hw) /* Configure the LCD with the OEM bits in NVM */ ret_val = e1000_oem_bits_config_ich8lan(hw, true); - /* Ungate automatic PHY configuration on non-managed 82579 */ - if ((hw->mac.type == e1000_pch2lan) && - !(er32(FWSM) & E1000_ICH_FWSM_FW_VALID)) { - msleep(10); - e1000_gate_hw_phy_config_ich8lan(hw, false); + if (hw->mac.type == e1000_pch2lan) { + /* Ungate automatic PHY configuration on non-managed 82579 */ + if (!(er32(FWSM) & E1000_ICH_FWSM_FW_VALID)) { + msleep(10); + e1000_gate_hw_phy_config_ich8lan(hw, false); + } + + /* Set EEE LPI Update Timer to 200usec */ + ret_val = hw->phy.ops.acquire(hw); + if (ret_val) + goto out; + ret_val = hw->phy.ops.write_reg_locked(hw, I82579_EMI_ADDR, + I82579_LPI_UPDATE_TIMER); + if (ret_val) + goto release; + ret_val = hw->phy.ops.write_reg_locked(hw, I82579_EMI_DATA, + 0x1387); +release: + hw->phy.ops.release(hw); } out: |