diff options
| author | Auke Kok <auke-jan.h.kok@intel.com> | 2007-10-31 15:22:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:03:43 -0800 |
| commit | 1eae4eb2a1c784bf35ee4f8f158cd21cf8c387c1 (patch) | |
| tree | 4e9de1ad1d24b201647376a21862a110e462c831 /drivers/net/e1000e/netdev.c | |
| parent | 93ca161027eb6a1761fb674ad7b995aedccf5f6e (diff) | |
e1000e: Disable L1 ASPM power savings for 82573 mobile variants
L1 ASPM link (pci-e link power savings) has significant benefits
(~1W savings when link is active) but unfortunately does not work
correctly on any of the chipsets that have 82573 on mobile platforms
which causes various nuisances:
- eeprom reads return garbage information leading to bad eeprom
checksums
- long ping times (up to 2 seconds)
- complete system hangs (freeze/lockup)
A lot of T60 owners have been plagued by this, but other mobile
solutions also suffer from these symptoms.
Disabling L1 ASPM before we activate the PCI-E link fixes all of
these issues at the cost of some power consumption.
Remove a workaround RDTR adjustment that is no longer needed with
this new one.
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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 9cc5a6b01bc1..5450ef8bf881 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; |