From: Sinan Kaya <okaya@xxxxxxxxxx>
[ Upstream commit 1ad61b612b95980a4d970c52022aa01dfc0f6068 ]
If _OSC execution fails today for platforms without an _OSC entry, code is
printing a misleading message saying disabling ASPM as follows:
acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
We need to ensure that platform supports ASPM to begin with.
Reported-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/acpi/pci_root.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 7433035ded955..e465e720eab20 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -455,8 +455,9 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
decode_osc_support(root, "OS supports", support);
status = acpi_pci_osc_support(root, support);
if (ACPI_FAILURE(status)) {
- dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
- acpi_format_exception(status));
+ dev_info(&device->dev, "_OSC failed (%s)%s\n",
+ acpi_format_exception(status),
+ pcie_aspm_support_enabled() ? "; disabling ASPM" : "");
*no_aspm = 1;
return;
}
--
2.20.1
