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| author | Shaohua Li <shaohua.li@intel.com> | 2008-07-23 10:32:42 +0800 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-07-28 14:57:30 -0700 |
| commit | d6d385743463f38a0da899cd4607e526ad9a049f (patch) | |
| tree | 3d5de148d1cf56e58c6321511adaf8078d9046c0 /drivers/pci/pcie | |
| parent | 149e16372a2066c5474d8a8db9b252afd57eb427 (diff) | |
| download | kernel_samsung_espresso10-d6d385743463f38a0da899cd4607e526ad9a049f.zip kernel_samsung_espresso10-d6d385743463f38a0da899cd4607e526ad9a049f.tar.gz kernel_samsung_espresso10-d6d385743463f38a0da899cd4607e526ad9a049f.tar.bz2 | |
PCI: add an option to allow ASPM enabled forcibly
A new option, pcie_aspm=force, will force ASPM to be enabled, even on system
with PCIe 1.0 devices.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pcie')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 7046052..9a7c9e1 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -55,7 +55,7 @@ struct pcie_link_state { struct endpoint_state endpoints[8]; }; -static int aspm_disabled; +static int aspm_disabled, aspm_force; static DEFINE_MUTEX(aspm_lock); static LIST_HEAD(link_list); @@ -527,9 +527,10 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev) */ pci_read_config_dword(child_dev, child_pos + PCI_EXP_DEVCAP, ®32); - if (!(reg32 & PCI_EXP_DEVCAP_RBER)) { + if (!(reg32 & PCI_EXP_DEVCAP_RBER && !aspm_force)) { printk("Pre-1.1 PCIe device detected, " - "disable ASPM for %s\n", pci_name(pdev)); + "disable ASPM for %s. It can be enabled forcedly" + " with 'pcie_aspm=force'\n", pci_name(pdev)); return -EINVAL; } } @@ -815,15 +816,22 @@ void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev) static int __init pcie_aspm_disable(char *str) { - aspm_disabled = 1; + if (!strcmp(str, "off")) { + aspm_disabled = 1; + printk(KERN_INFO "PCIe ASPM is disabled\n"); + } else if (!strcmp(str, "force")) { + aspm_force = 1; + printk(KERN_INFO "PCIe ASPM is forcedly enabled\n"); + } return 1; } -__setup("pcie_noaspm", pcie_aspm_disable); +__setup("pcie_aspm=", pcie_aspm_disable); void pcie_no_aspm(void) { - aspm_disabled = 1; + if (!aspm_force) + aspm_disabled = 1; } #ifdef CONFIG_ACPI |