diff options
| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2009-09-16 17:29:59 +0900 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-09-17 10:05:16 -0700 |
| commit | 7557b5d63259d55f716e62e528978d4866318515 (patch) | |
| tree | a7de26e15fe8d551f7b853d9ecd47403f31b13db /drivers/pci | |
| parent | ab86e5765d41a5eb4239a1c04d613db87bea5ed8 (diff) | |
| download | linux-7557b5d63259d55f716e62e528978d4866318515.tar.bz2 | |
PCI ASPM: support L1 only
The definition of the ASPM support field in the Link Capabilities
Register had been changed by the "ASPM optionality ECN" as follows:
<Before>
00b Reserved
01b L0s Supported
10b Reserved
11b L0s and L1 Supported
<After>
00b No ASPM Support
01b L0s Supported
10b L1 Supported
11b L0s and L1 Supported
Current linux ASPM driver doesn't enable ASPM if the support field is
00b or 10b. So there is no impact about 00b. But current linux ASPM
driver doesn't enable L1 if the support field is 10b. With this patch,
10b (L1 support) is handled properly.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index f289ca9bf18d..745402e8e498 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -303,9 +303,6 @@ static void pcie_get_aspm_reg(struct pci_dev *pdev, pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); pci_read_config_dword(pdev, pos + PCI_EXP_LNKCAP, ®32); info->support = (reg32 & PCI_EXP_LNKCAP_ASPMS) >> 10; - /* 00b and 10b are defined as "Reserved". */ - if (info->support == PCIE_LINK_STATE_L1) - info->support = 0; info->latency_encoding_l0s = (reg32 & PCI_EXP_LNKCAP_L0SEL) >> 12; info->latency_encoding_l1 = (reg32 & PCI_EXP_LNKCAP_L1EL) >> 15; pci_read_config_word(pdev, pos + PCI_EXP_LNKCTL, ®16); |