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e1000e: Disable L1 ASPM power savings for 82573 mobile variants

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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>
This commit is contained in:
Auke Kok 2007-10-31 15:22:00 -07:00 committed by David S. Miller
parent 93ca161027
commit 1eae4eb2a1
4 changed files with 30 additions and 9 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/net/e1000e/82571.c
View file

@ -1343,7 +1343,6 @@ struct e1000_info e1000_82573_info = {
| FLAG_HAS_STATS_ICR_ICT
| FLAG_HAS_SMART_POWER_DOWN
| FLAG_HAS_AMT
| FLAG_HAS_ASPM
| FLAG_HAS_ERT
| FLAG_HAS_SWSM_ON_LOAD,
.pba = 20,

1
drivers/net/e1000e/e1000.h
View file

@ -288,7 +288,6 @@ struct e1000_info {
#define FLAG_HAS_CTRLEXT_ON_LOAD (1 << 5)
#define FLAG_HAS_SWSM_ON_LOAD (1 << 6)
#define FLAG_HAS_JUMBO_FRAMES (1 << 7)
#define FLAG_HAS_ASPM (1 << 8)
#define FLAG_HAS_STATS_ICR_ICT (1 << 9)
#define FLAG_HAS_STATS_PTC_PRC (1 << 10)
#define FLAG_HAS_SMART_POWER_DOWN (1 << 11)

30
drivers/net/e1000e/netdev.c
View file

@ -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;

7
drivers/net/e1000e/param.c
View file

@ -262,13 +262,6 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
.max = MAX_RXDELAY } }
};
/* modify min and default if 82573 for slow ping w/a,
* a value greater than 8 needs to be set for RDTR */
if (adapter->flags & FLAG_HAS_ASPM) {
opt.def = 32;
opt.arg.r.min = 8;
}
if (num_RxIntDelay > bd) {
adapter->rx_int_delay = RxIntDelay[bd];
e1000_validate_option(&adapter->rx_int_delay, &opt,