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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>
This commit is contained in:
Bruce Allan 2011-02-25 06:58:03 +00:00 committed by Jeff Kirsher
parent 5661aeb08e
commit 1effb45cca
1 changed files with 24 additions and 5 deletions
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29
drivers/net/e1000e/ich8lan.c
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@ -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: