From 5fde244d39b88625ac578d83e6625138714de031 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Wed, 23 Jul 2008 10:32:24 +0800 Subject: PCI: disable ASPM per ACPI FADT setting The ACPI FADT table includes an ASPM control bit. If the bit is set, do not enable ASPM since it may indicate that the platform doesn't actually support the feature. Tested-by: Jack Howarth Signed-off-by: Shaohua Li Signed-off-by: Jesse Barnes --- drivers/pci/pci-acpi.c | 7 +++++++ drivers/pci/pcie/aspm.c | 5 +++++ 2 files changed, 12 insertions(+) (limited to 'drivers/pci') diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 7764768b..89a2f0f 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -372,6 +373,12 @@ static int __init acpi_pci_init(void) printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); pci_no_msi(); } + + if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) { + printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); + pcie_no_aspm(); + } + ret = register_acpi_bus_type(&acpi_pci_bus); if (ret) return 0; diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index f824955..759c51a 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -808,6 +808,11 @@ static int __init pcie_aspm_disable(char *str) __setup("pcie_noaspm", pcie_aspm_disable); +void pcie_no_aspm(void) +{ + aspm_disabled = 1; +} + #ifdef CONFIG_ACPI #include #include -- cgit v1.1