diff options
Diffstat (limited to 'drivers/acpi/pci_root.c')
| -rw-r--r-- | drivers/acpi/pci_root.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index e6ae603ed1a1..cd4de7e038ea 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -35,6 +35,7 @@ #include <linux/pci-aspm.h> #include <linux/acpi.h> #include <linux/slab.h> +#include <linux/dmi.h> #include <acpi/apei.h> /* for acpi_hest_init() */ #include "internal.h" @@ -430,6 +431,19 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, acpi_handle handle = device->handle; /* + * Apple always return failure on _OSC calls when _OSI("Darwin") has + * been called successfully. We know the feature set supported by the + * platform, so avoid calling _OSC at all + */ + + if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) { + root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; + decode_osc_control(root, "OS assumes control of", + root->osc_control_set); + return; + } + + /* * All supported architectures that use ACPI have support for * PCI domains, so we indicate this in _OSC support capabilities. */ |