diff options
Diffstat (limited to 'src/device/pci_ops.c')
| -rw-r--r-- | src/device/pci_ops.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/device/pci_ops.c b/src/device/pci_ops.c index 90f45bf21a61..aaa9f95fb1f4 100644 --- a/src/device/pci_ops.c +++ b/src/device/pci_ops.c @@ -78,3 +78,21 @@ void __noreturn pcidev_die(void) { die("PCI: dev is NULL!\n"); } + +bool pci_dev_is_wake_source(const struct device *dev) +{ + unsigned int pm_cap; + uint16_t pmcs; + + if (dev->path.type != DEVICE_PATH_PCI) + return false; + + pm_cap = pci_find_capability(dev, PCI_CAP_ID_PM); + if (!pm_cap) + return false; + + pmcs = pci_s_read_config16(PCI_BDF(dev), pm_cap + PCI_PM_CTRL); + + /* PCI Device is a wake source if PME_ENABLE and PME_STATUS are set in PMCS register. */ + return (pmcs & PCI_PM_CTRL_PME_ENABLE) && (pmcs & PCI_PM_CTRL_PME_STATUS); +} |