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| author | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-17 20:23:52 (GMT) |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-17 20:23:52 (GMT) |
| commit | 224abb67e6eb5ac062de9239163136d5ec3155c8 (patch) | |
| tree | 61f5eecdc5499304d8d867acc6491d92d454b038 | |
| parent | 006d44e49a259b39947366728d65a873a19aadc0 (diff) | |
| download | linux-224abb67e6eb5ac062de9239163136d5ec3155c8.tar.xz | |
PCI: Document connection between pci_power_t and hardware PM capability
The dev.pme_support field, pci_pm_init(), pci_pme_capable(), and
pci_raw_set_power_state() depend on the fact that the pci_power_t values
(PCI_D0, PCI_D1, etc.) match the definition of the Capabilities PME_Support
and the Control/Status PowerState fields in the Power Management capability
(see PCI Bus Power Management spec r1.2, sec 3.2.3).
Add a note to this effect at the pci_power_t typedef.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
| -rw-r--r-- | include/linux/pci.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 8597b42..0a1a9e3 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -101,6 +101,10 @@ enum { DEVICE_COUNT_RESOURCE = PCI_NUM_RESOURCES, }; +/* + * pci_power_t values must match the bits in the Capabilities PME_Support + * and Control/Status PowerState fields in the Power Management capability. + */ typedef int __bitwise pci_power_t; #define PCI_D0 ((pci_power_t __force) 0) |