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authorBjorn Helgaas <bhelgaas@google.com>2013-08-30 03:23:33 +0400
committerBjorn Helgaas <bhelgaas@google.com>2013-08-30 03:23:33 +0400
commite89c33168aad32436da842ddda307dcc31c0c4e2 (patch)
tree831668bbda77e4b5ff463b26a75c8f88819436aa /drivers/acpi/pci_root.c
parent2e8b5f621dbe29425906852c6079afb6b28720cb (diff)
parent3dc48af310709b85d07c8b0d3aa8f1ead02829d3 (diff)
downloadlinux-e89c33168aad32436da842ddda307dcc31c0c4e2.tar.xz
Merge branch 'pci/misc' into next
* pci/misc: PCI/ACPI: Fix _OSC ordering to allow PCIe hotplug use when available PCI: exynos: Add I/O access wrappers PCI: designware: Drop "addr" arg from dw_pcie_readl_rc()/dw_pcie_writel_rc()
Diffstat (limited to 'drivers/acpi/pci_root.c')
-rw-r--r--drivers/acpi/pci_root.c62
1 files changed, 38 insertions, 24 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ce04eb28e029..d3874f425653 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -378,6 +378,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
struct acpi_pci_root *root;
u32 flags, base_flags;
acpi_handle handle = device->handle;
+ bool no_aspm = false, clear_aspm = false;
root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
if (!root)
@@ -437,27 +438,6 @@ static int acpi_pci_root_add(struct acpi_device *device,
flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
acpi_pci_osc_support(root, flags);
- /*
- * TBD: Need PCI interface for enumeration/configuration of roots.
- */
-
- /*
- * Scan the Root Bridge
- * --------------------
- * Must do this prior to any attempt to bind the root device, as the
- * PCI namespace does not get created until this call is made (and
- * thus the root bridge's pci_dev does not exist).
- */
- root->bus = pci_acpi_scan_root(root);
- if (!root->bus) {
- dev_err(&device->dev,
- "Bus %04x:%02x not present in PCI namespace\n",
- root->segment, (unsigned int)root->secondary.start);
- result = -ENODEV;
- goto end;
- }
-
- /* Indicate support for various _OSC capabilities. */
if (pci_ext_cfg_avail())
flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
if (pcie_aspm_support_enabled()) {
@@ -471,7 +451,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
if (ACPI_FAILURE(status)) {
dev_info(&device->dev, "ACPI _OSC support "
"notification failed, disabling PCIe ASPM\n");
- pcie_no_aspm();
+ no_aspm = true;
flags = base_flags;
}
}
@@ -503,7 +483,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
* We have ASPM control, but the FADT indicates
* that it's unsupported. Clear it.
*/
- pcie_clear_aspm(root->bus);
+ clear_aspm = true;
}
} else {
dev_info(&device->dev,
@@ -512,7 +492,14 @@ static int acpi_pci_root_add(struct acpi_device *device,
acpi_format_exception(status), flags);
dev_info(&device->dev,
"ACPI _OSC control for PCIe not granted, disabling ASPM\n");
- pcie_no_aspm();
+ /*
+ * We want to disable ASPM here, but aspm_disabled
+ * needs to remain in its state from boot so that we
+ * properly handle PCIe 1.1 devices. So we set this
+ * flag here, to defer the action until after the ACPI
+ * root scan.
+ */
+ no_aspm = true;
}
} else {
dev_info(&device->dev,
@@ -520,6 +507,33 @@ static int acpi_pci_root_add(struct acpi_device *device,
"(_OSC support mask: 0x%02x)\n", flags);
}
+ /*
+ * TBD: Need PCI interface for enumeration/configuration of roots.
+ */
+
+ /*
+ * Scan the Root Bridge
+ * --------------------
+ * Must do this prior to any attempt to bind the root device, as the
+ * PCI namespace does not get created until this call is made (and
+ * thus the root bridge's pci_dev does not exist).
+ */
+ root->bus = pci_acpi_scan_root(root);
+ if (!root->bus) {
+ dev_err(&device->dev,
+ "Bus %04x:%02x not present in PCI namespace\n",
+ root->segment, (unsigned int)root->secondary.start);
+ result = -ENODEV;
+ goto end;
+ }
+
+ 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();
+
pci_acpi_add_bus_pm_notifier(device, root->bus);
if (device->wakeup.flags.run_wake)
device_set_run_wake(root->bus->bridge, true);