e1000e: issues in Sx on 82577/8/9
A workaround was previously put in the driver to reset the device when transitioning to Sx in order to activate the changed settings of the PHY OEM bits (Low Power Link Up, or LPLU, and GbE disable configuration) for 82577/8/9 devices. After further review, it was found such a reset can cause the 82579 to confuse which version of 82579 it actually is and broke LPLU on all 82577/8/9 devices. The workaround during an S0->Sx transition on 82579 (instead of resetting the PHY) is to restart auto-negotiation after the OEM bits are configured; the restart of auto-negotiation activates the new OEM bits as does the reset. With 82577/8, the reset is changed to a generic reset which fixes the LPLU bits getting set wrong. Signed-off-by: Bruce Allan <bruce.w.allan@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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@ -1310,10 +1310,6 @@ static s32 e1000_oem_bits_config_ich8lan(struct e1000_hw *hw, bool d0_state)
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if (mac_reg & E1000_PHY_CTRL_D0A_LPLU)
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oem_reg |= HV_OEM_BITS_LPLU;
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/* Set Restart auto-neg to activate the bits */
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if (!hw->phy.ops.check_reset_block(hw))
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oem_reg |= HV_OEM_BITS_RESTART_AN;
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} else {
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if (mac_reg & (E1000_PHY_CTRL_GBE_DISABLE |
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E1000_PHY_CTRL_NOND0A_GBE_DISABLE))
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@ -1324,6 +1320,11 @@ static s32 e1000_oem_bits_config_ich8lan(struct e1000_hw *hw, bool d0_state)
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oem_reg |= HV_OEM_BITS_LPLU;
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}
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/* Set Restart auto-neg to activate the bits */
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if ((d0_state || (hw->mac.type != e1000_pchlan)) &&
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!hw->phy.ops.check_reset_block(hw))
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oem_reg |= HV_OEM_BITS_RESTART_AN;
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ret_val = hw->phy.ops.write_reg_locked(hw, HV_OEM_BITS, oem_reg);
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release:
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@ -3682,7 +3683,11 @@ void e1000_suspend_workarounds_ich8lan(struct e1000_hw *hw)
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if (hw->mac.type >= e1000_pchlan) {
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e1000_oem_bits_config_ich8lan(hw, false);
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e1000_phy_hw_reset_ich8lan(hw);
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/* Reset PHY to activate OEM bits on 82577/8 */
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if (hw->mac.type == e1000_pchlan)
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e1000e_phy_hw_reset_generic(hw);
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ret_val = hw->phy.ops.acquire(hw);
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if (ret_val)
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return;
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