ACPI / PM: Introduce os_accessible flag for power_state
Currently we have valid flag to represent if this ACPI device power state is valid. A device power state is valid does not necessarily mean we, as OSPM, has a mean to put the device into that power state, e.g. D3 cold is always a valid power state for any ACPI device, but if there is no _PS3 or _PRx for this device, we can't really put that device into D3 cold power state. The same is true for D0 power state. So here comes the os_accessible flag, which is only set if the device has provided us the required means to put it into that power state, e.g. if we have _PS3 or _PRx, we can put the device into D3 cold state and thus, D3 cold power state's os_accessible flag will be set in this case. And a new wrapper inline function is added to be used to check if firmware has provided us a way to power off the device during runtime. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -965,8 +965,10 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
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* D3hot is only valid if _PR3 present.
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*/
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if (ps->resources.count ||
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(ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
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(ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
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ps->flags.valid = 1;
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ps->flags.os_accessible = 1;
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}
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ps->power = -1; /* Unknown - driver assigned */
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ps->latency = -1; /* Unknown - driver assigned */
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@ -982,6 +984,11 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
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if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
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device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
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/* Presence of _PS3 or _PRx means we can put the device into D3 cold */
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if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
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device->power.flags.power_resources)
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device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
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acpi_bus_init_power(device);
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return 0;
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@ -201,6 +201,7 @@ struct acpi_device_power_flags {
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struct acpi_device_power_state {
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struct {
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u8 valid:1;
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u8 os_accessible:1;
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u8 explicit_set:1; /* _PSx present? */
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u8 reserved:6;
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} flags;
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@ -500,6 +501,11 @@ static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
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return adev->wakeup.flags.valid;
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}
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static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
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{
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return adev->power.states[ACPI_STATE_D3_COLD].flags.os_accessible;
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}
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#else /* CONFIG_ACPI */
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static inline int register_acpi_bus_type(void *bus) { return 0; }
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