diff options
Diffstat (limited to 'drivers/net/e1000e/netdev.c')
| -rw-r--r-- | drivers/net/e1000e/netdev.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c index 9cc5a6b01bc..5450ef8bf88 100644 --- a/drivers/net/e1000e/netdev.c +++ b/drivers/net/e1000e/netdev.c @@ -3509,6 +3509,33 @@ static int e1000_suspend(struct pci_dev *pdev, pm_message_t state) return 0; } +static void e1000e_disable_l1aspm(struct pci_dev *pdev) +{ + int pos; + u32 cap; + u16 val; + + /* + * 82573 workaround - disable L1 ASPM on mobile chipsets + * + * L1 ASPM on various mobile (ich7) chipsets do not behave properly + * resulting in lost data or garbage information on the pci-e link + * level. This could result in (false) bad EEPROM checksum errors, + * long ping times (up to 2s) or even a system freeze/hang. + * + * Unfortunately this feature saves about 1W power consumption when + * active. + */ + pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); + pci_read_config_dword(pdev, pos + PCI_EXP_LNKCAP, &cap); + pci_read_config_word(pdev, pos + PCI_EXP_LNKCTL, &val); + if (val & 0x2) { + dev_warn(&pdev->dev, "Disabling L1 ASPM\n"); + val &= ~0x2; + pci_write_config_word(pdev, pos + PCI_EXP_LNKCTL, val); + } +} + #ifdef CONFIG_PM static int e1000_resume(struct pci_dev *pdev) { @@ -3519,6 +3546,7 @@ static int e1000_resume(struct pci_dev *pdev) pci_set_power_state(pdev, PCI_D0); pci_restore_state(pdev); + e1000e_disable_l1aspm(pdev); err = pci_enable_device(pdev); if (err) { dev_err(&pdev->dev, @@ -3619,6 +3647,7 @@ static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev) struct e1000_adapter *adapter = netdev_priv(netdev); struct e1000_hw *hw = &adapter->hw; + e1000e_disable_l1aspm(pdev); if (pci_enable_device(pdev)) { dev_err(&pdev->dev, "Cannot re-enable PCI device after reset.\n"); @@ -3720,6 +3749,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev, u16 eeprom_data = 0; u16 eeprom_apme_mask = E1000_EEPROM_APME; + e1000e_disable_l1aspm(pdev); err = pci_enable_device(pdev); if (err) return err; |