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authorBjorn Helgaas <bhelgaas@google.com>2015-04-10 16:27:18 +0300
committerBjorn Helgaas <bhelgaas@google.com>2015-04-10 16:27:18 +0300
commit5468d5a64bf1e002e5081fa280186d0eba09fa0e (patch)
treea9c1500d4b0cfb9db1f822dc1357c184b0f2f188 /drivers/acpi
parent4dd1f57956ada782fd80b1c11c30a9595d6caafc (diff)
parent55db3208f238ee776f1f747734051723d8a3c13e (diff)
downloadlinux-5468d5a64bf1e002e5081fa280186d0eba09fa0e.tar.xz
Merge branch 'pci/misc' into next
* pci/misc: PCI: Read capability list as dwords, not bytes PCI: Don't clear ASPM bits when the FADT declares it's unsupported PCI: Clarify policy for vendor IDs in pci.txt PCI/ACPI: Optimize device state transition delays PCI: Export pci_find_host_bridge() for use inside PCI core PCI: Make a shareable UUID for PCI firmware ACPI _DSM PCI: Fix typo in Thunderbolt kernel message
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/pci_root.c19
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 68a5f712cd19..1b5569c092c6 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -423,8 +423,7 @@ out:
}
EXPORT_SYMBOL(acpi_pci_osc_control_set);
-static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
- int *clear_aspm)
+static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
{
u32 support, control, requested;
acpi_status status;
@@ -495,10 +494,12 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
decode_osc_control(root, "OS now controls", control);
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
/*
- * We have ASPM control, but the FADT indicates
- * that it's unsupported. Clear it.
+ * We have ASPM control, but the FADT indicates that
+ * it's unsupported. Leave existing configuration
+ * intact and prevent the OS from touching it.
*/
- *clear_aspm = 1;
+ dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
+ *no_aspm = 1;
}
} else {
decode_osc_control(root, "OS requested", requested);
@@ -525,7 +526,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
int result;
struct acpi_pci_root *root;
acpi_handle handle = device->handle;
- int no_aspm = 0, clear_aspm = 0;
+ int no_aspm = 0;
bool hotadd = system_state != SYSTEM_BOOTING;
root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
@@ -584,7 +585,7 @@ 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, &clear_aspm);
+ negotiate_os_control(root, &no_aspm);
/*
* TBD: Need PCI interface for enumeration/configuration of roots.
@@ -607,10 +608,6 @@ static int acpi_pci_root_add(struct acpi_device *device,
goto remove_dmar;
}
- if (clear_aspm) {
- dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n");
- pcie_clear_aspm(root->bus);
- }
if (no_aspm)
pcie_no_aspm();