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e1000e: Fix Runtime PM blocks EEE link negotiation in S5 

Adding a function, and associated calls, to flush writes to (read) the LPIC
MAC register before entering the shutdown flow.  This fixes the problem
of the PHY never negotiating a 100M link (if both sides of the link support
EEE and 100M link) when Runtime PM is enabled.

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>
This commit is contained in:
David Ertman 2014-07-11 06:21:31 +00:00 committed by Jeff Kirsher
parent 2116bc25e8
commit 2a7e19af94
1 changed files with 26 additions and 0 deletions
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26
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -6033,6 +6033,28 @@ release:
return retval;
}
static void e1000e_flush_lpic(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct e1000_adapter *adapter = netdev_priv(netdev);
struct e1000_hw *hw = &adapter->hw;
u32 ret_val;
pm_runtime_get_sync(netdev->dev.parent);
ret_val = hw->phy.ops.acquire(hw);
if (ret_val)
goto fl_out;
pr_info("EEE TX LPI TIMER: %08X\n",
er32(LPIC) >> E1000_LPIC_LPIET_SHIFT);
hw->phy.ops.release(hw);
fl_out:
pm_runtime_put_sync(netdev->dev.parent);
}
static int e1000e_pm_freeze(struct device *dev)
{
struct net_device *netdev = pci_get_drvdata(to_pci_dev(dev));
@ -6333,6 +6355,8 @@ static int e1000e_pm_suspend(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
e1000e_flush_lpic(pdev);
e1000e_pm_freeze(dev);
return __e1000_shutdown(pdev, false);
@ -6416,6 +6440,8 @@ static int e1000e_pm_runtime_suspend(struct device *dev)
static void e1000_shutdown(struct pci_dev *pdev)
{
e1000e_flush_lpic(pdev);
e1000e_pm_freeze(&pdev->dev);
__e1000_shutdown(pdev, false);