ACPI, PCI: PCIe ASPM _OSC support capabilities called when root bridge added

The _OSC capabilities OSC_ACTIVE_STATE_PWR_SUPPORT and
OSC_CLOCK_PWR_CAPABILITY_SUPPORT are set when the root bridge is added
with pci_acpi_osc_support(), so we no longer need to do it in the
ASPM driver.

Added the function pcie_aspm_enabled, which returns true if pcie_aspm=off
is not on the kernel command-line.

Signed-off-by: Andrew Patterson
---

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 191a510..a7068b4 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -347,6 +347,9 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
/* Indicate support for various _OSC capabilities. */
if (pci_ext_cfg_avail(root->bus->self))
flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
+ if (pcie_aspm_enabled())
+ flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
+ OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
if (flags != base_flags)
pci_acpi_osc_support(device->handle, flags);

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 8f63f4c..1089f86 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -834,24 +834,15 @@ void pcie_no_aspm(void)
aspm_disabled = 1;
}

-#ifdef CONFIG_ACPI
-#include
-#include
-static void pcie_aspm_platform_init(void)
-{
- pcie_osc_support_set(OSC_ACTIVE_STATE_PWR_SUPPORT|
- OSC_CLOCK_PWR_CAPABILITY_SUPPORT);
-}
-#else
-static inline void pcie_aspm_platform_init(void) { }
-#endif
-
-static int __init pcie_aspm_init(void)
+/**
+ * pcie_aspm_enabled - is PCIe ASPM enabled?
+ *
+ * Returns true if ASPM has not been disabled by the command-line option
+ * pcie_aspm=off.
+ **/
+int pcie_aspm_enabled(void)
{
- if (aspm_disabled)
- return 0;
- pcie_aspm_platform_init();
- return 0;
+ return !aspm_disabled;
}
+EXPORT_SYMBOL(pcie_aspm_enabled);

-fs_initcall(pcie_aspm_init);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c5d40ba..bdaf221 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -786,6 +786,15 @@ extern void msi_remove_pci_irq_vectors(struct pci_dev *dev);
extern void pci_restore_msi_state(struct pci_dev *dev);
#endif

+#ifndef CONFIG_PCIEASPM
+static inline int pcie_aspm_enabled(void)
+{
+ return 0;
+}
+#else
+extern int pcie_aspm_enabled(void);
+#endif
+
#ifdef CONFIG_HT_IRQ
/* The functions a driver should call */
int ht_create_irq(struct pci_dev *dev, int idx);

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