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authorShaohua Li <shaohua.li@intel.com>2008-07-23 10:32:42 +0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-07-28 14:57:30 -0700
commitd6d385743463f38a0da899cd4607e526ad9a049f (patch)
tree3d5de148d1cf56e58c6321511adaf8078d9046c0 /drivers
parent149e16372a2066c5474d8a8db9b252afd57eb427 (diff)
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')
-rw-r--r--drivers/pci/pcie/aspm.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 704605298c5..9a7c9e1408a 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,
&reg32);
- 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