e1000e: Add support for EEE in Sx states
On I217 and newer hardware, EEE is enabled in the PHY by the software
when link is up and disabled by the hardware when link is lost.
To enable EEE in Sx (When both ends of the link support, and are enabled
for, EEE and 100Mbps), we need to disable LPLU and configure the PHY to
automatically enable EEE when link is up, since there will be no software
to complete the task.
To configure this in the PHY, the Auto Enable LPI bit in the Low Power
Idle GPIO Control register must be set. For normal operation in S0, this
bit must be cleared.
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index 8dbcdc8..48b74a5 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -4605,14 +4605,23 @@
/* Disable LPLU if both link partners support 100BaseT
* EEE and 100Full is advertised on both ends of the
- * link.
+ * link, and enable Auto Enable LPI since there will
+ * be no driver to enable LPI while in Sx.
*/
if ((eee_advert & I82579_EEE_100_SUPPORTED) &&
(dev_spec->eee_lp_ability &
I82579_EEE_100_SUPPORTED) &&
- (hw->phy.autoneg_advertised & ADVERTISE_100_FULL))
+ (hw->phy.autoneg_advertised & ADVERTISE_100_FULL)) {
phy_ctrl &= ~(E1000_PHY_CTRL_D0A_LPLU |
E1000_PHY_CTRL_NOND0A_LPLU);
+
+ /* Set Auto Enable LPI after link up */
+ e1e_rphy_locked(hw,
+ I217_LPI_GPIO_CTRL, &phy_reg);
+ phy_reg |= I217_LPI_GPIO_CTRL_AUTO_EN_LPI;
+ e1e_wphy_locked(hw,
+ I217_LPI_GPIO_CTRL, phy_reg);
+ }
}
/* For i217 Intel Rapid Start Technology support,
@@ -4709,6 +4718,11 @@
return;
}
+ /* Clear Auto Enable LPI after link up */
+ e1e_rphy_locked(hw, I217_LPI_GPIO_CTRL, &phy_reg);
+ phy_reg &= ~I217_LPI_GPIO_CTRL_AUTO_EN_LPI;
+ e1e_wphy_locked(hw, I217_LPI_GPIO_CTRL, phy_reg);
+
if (!(er32(FWSM) & E1000_ICH_FWSM_FW_VALID)) {
/* Restore clear on SMB if no manageability engine
* is present