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e1000e: Feature Enable PHY Ultra Low Power Mode (ULP)

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ULP is a power saving feature that reduces the power consumption of the
PHY when a cable is not connected.

ULP is gated on the following conditions:
1) The hardware must support ULP.  Currently this is only I218
   devices from Intel
2) ULP is initiated by the driver, so, no driver results in no ULP.
3) ULP's implementation utilizes Runtime Power Management to toggle its
   execution.  ULP is enabled/disabled based on the state of Runtime PM.
4) ULP is not active when wake-on-unicast, multicast or broadcast is active
   as these features are mutually-exclusive.

Since the PHY is in an unavailable state while ULP is active, any access
of the PHY registers will fail.  This is resolved by utilizing kernel
calls that cause the device to exit Runtime PM (e.g. pm_runtime_get_sync)
and then, after PHY access is complete,  allow the device to resume
Runtime PM (e.g. pm_runtime_put_sync).

Under certain conditions, toggling the LANPHYPC is necessary to disable
ULP mode.  Break out existing code to toggle LANPHYPC to a new function
to avoid code duplication.

Signed-off-by: Dave Ertman <davidx.m.ertman@intel.com>
Cc: 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>
This commit is contained in:
David Ertman
2014-02-22 03:15:17 +00:00
committed by Jeff Kirsher
parent 63eb48f151
commit 74f350ee08
6 changed files with 354 additions and 33 deletions
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24
drivers/net/ethernet/intel/e1000e/netdev.c
View File

@@ -5856,7 +5856,7 @@ static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
static int e1000_init_phy_wakeup(struct e1000_adapter *adapter, u32 wufc)
{
struct e1000_hw *hw = &adapter->hw;
u32 i, mac_reg;
u32 i, mac_reg, wuc;
u16 phy_reg, wuc_enable;
int retval;
@@ -5903,13 +5903,18 @@ static int e1000_init_phy_wakeup(struct e1000_adapter *adapter, u32 wufc)
phy_reg |= BM_RCTL_RFCE;
hw->phy.ops.write_reg_page(&adapter->hw, BM_RCTL, phy_reg);
wuc = E1000_WUC_PME_EN;
if (wufc & (E1000_WUFC_MAG | E1000_WUFC_LNKC))
wuc |= E1000_WUC_APME;
/* enable PHY wakeup in MAC register */
ew32(WUFC, wufc);
ew32(WUC, E1000_WUC_PHY_WAKE | E1000_WUC_PME_EN);
ew32(WUC, (E1000_WUC_PHY_WAKE | E1000_WUC_APMPME |
E1000_WUC_PME_STATUS | wuc));
/* configure and enable PHY wakeup in PHY registers */
hw->phy.ops.write_reg_page(&adapter->hw, BM_WUFC, wufc);
hw->phy.ops.write_reg_page(&adapter->hw, BM_WUC, E1000_WUC_PME_EN);
hw->phy.ops.write_reg_page(&adapter->hw, BM_WUC, wuc);
/* activate PHY wakeup */
wuc_enable |= BM_WUC_ENABLE_BIT | BM_WUC_HOST_WU_BIT;
@@ -6012,8 +6017,19 @@ static int __e1000_shutdown(struct pci_dev *pdev, bool runtime)
e1000_power_down_phy(adapter);
}
if (adapter->hw.phy.type == e1000_phy_igp_3)
if (adapter->hw.phy.type == e1000_phy_igp_3) {
e1000e_igp3_phy_powerdown_workaround_ich8lan(&adapter->hw);
} else if (hw->mac.type == e1000_pch_lpt) {
if (!(wufc & (E1000_WUFC_EX | E1000_WUFC_MC | E1000_WUFC_BC)))
/* ULP does not support wake from unicast, multicast
* or broadcast.
*/
retval = e1000_enable_ulp_lpt_lp(hw, !runtime);
if (retval)
return retval;
}
/* Release control of h/w to f/w. If f/w is AMT enabled, this
* would have already happened in close and is redundant.