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-rw-r--r--drivers/pci/probe.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3706ce7972d..aebab71abeb 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -857,6 +857,49 @@ int pci_cfg_space_size_ext(struct pci_dev *dev)
return PCI_CFG_SPACE_SIZE;
}
+/**
+ * pci_disable_pme - Disable the PME function of PCI device
+ * @dev: PCI device affected
+ * -EINVAL is returned if PCI device doesn't support PME.
+ * Zero is returned if the PME is supported and can be disabled.
+ */
+static int pci_disable_pme(struct pci_dev *dev)
+{
+ int pm;
+ u16 value;
+
+ /* find PCI PM capability in list */
+ pm = pci_find_capability(dev, PCI_CAP_ID_PM);
+
+ /* If device doesn't support PM Capabilities, it means that PME is
+ * not supported.
+ */
+ if (!pm)
+ return -EINVAL;
+ /* Check device's ability to generate PME# */
+ pci_read_config_word(dev, pm + PCI_PM_PMC, &value);
+
+ value &= PCI_PM_CAP_PME_MASK;
+ /* Check if it can generate PME# */
+ if (!value) {
+ /*
+ * If it is zero, it means that PME is still unsupported
+ * although there exists the PM capability.
+ */
+ return -EINVAL;
+ }
+
+ pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
+
+ /* Clear PME_Status by writing 1 to it */
+ value |= PCI_PM_CTRL_PME_STATUS ;
+ /* Disable PME enable bit */
+ value &= ~PCI_PM_CTRL_PME_ENABLE;
+ pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
+
+ return 0;
+}
+
int pci_cfg_space_size(struct pci_dev *dev)
{
int pos;
@@ -964,6 +1007,7 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
}
pci_vpd_pci22_init(dev);
+ pci_disable_pme(dev);
return dev;
}