Commit f8993aff authored by Shaohua Li's avatar Shaohua Li Committed by Len Brown
Browse files

ACPI: Disable MSI on request of FADT 



The ACPI spec defines the bit and Microsoft uses it,
so Linux must use it too.

Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a23cf14b

drivers/pci/pci-acpi.c

+4 −0
Original line number Diff line number Diff line
@@ -317,6 +317,10 @@ static int __init acpi_pci_init(void) 
{

	int ret;



	if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {

		printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");

		pci_no_msi();

	}

	ret = register_acpi_bus_type(&acpi_pci_bus);

	if (ret)

		return 0;

include/acpi/actbl.h

+1 −0
Original line number Diff line number Diff line
@@ -276,6 +276,7 @@ enum acpi_prefered_pm_profiles { 


#define BAF_LEGACY_DEVICES              0x0001

#define BAF_8042_KEYBOARD_CONTROLLER    0x0002

#define BAF_MSI_NOT_SUPPORTED           0x0008



#define FADT2_REVISION_ID               3

#define FADT2_MINUS_REVISION_ID         2