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| author | Ingo Molnar <mingo@kernel.org> | 2018-10-29 07:12:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-10-29 07:12:34 +0100 |
| commit | 97ec37c57dd411d0815455bca07166411c0da1df (patch) | |
| tree | d64850c43778d15c137772957788093a8b7d032c /drivers/acpi/pci_root.c | |
| parent | ace6485a03266cc3c198ce8e927a1ce0ce139699 (diff) | |
| parent | b59dfdaef173677b0b7e10f375226c0a1114fd20 (diff) | |
| download | talos-op-linux-97ec37c57dd411d0815455bca07166411c0da1df.tar.gz talos-op-linux-97ec37c57dd411d0815455bca07166411c0da1df.zip | |
Merge branch 'linus' into x86/urgent, to refresh the tree
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/acpi/pci_root.c')
| -rw-r--r-- | drivers/acpi/pci_root.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 7433035ded95..707aafc7c2aa 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -421,7 +421,8 @@ out: } EXPORT_SYMBOL(acpi_pci_osc_control_set); -static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) +static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, + bool is_pcie) { u32 support, control, requested; acpi_status status; @@ -455,9 +456,15 @@ 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)); *no_aspm = 1; + + /* _OSC is optional for PCI host bridges */ + if ((status == AE_NOT_FOUND) && !is_pcie) + return; + + dev_info(&device->dev, "_OSC failed (%s)%s\n", + acpi_format_exception(status), + pcie_aspm_support_enabled() ? "; disabling ASPM" : ""); return; } @@ -533,6 +540,7 @@ static int acpi_pci_root_add(struct acpi_device *device, acpi_handle handle = device->handle; int no_aspm = 0; bool hotadd = system_state == SYSTEM_RUNNING; + bool is_pcie; root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); if (!root) @@ -590,7 +598,8 @@ static int acpi_pci_root_add(struct acpi_device *device, root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); - negotiate_os_control(root, &no_aspm); + is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; + negotiate_os_control(root, &no_aspm, is_pcie); /* * TBD: Need PCI interface for enumeration/configuration of roots. |
