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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>
This commit is contained in:
Bjorn Helgaas 2016-06-17 15:23:52 -05:00
parent 006d44e49a
commit 224abb67e6
1 changed files with 4 additions and 0 deletions
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4
include/linux/pci.h
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@ -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)