From 1399dfcdfe89898ccd791216f9679ba734aea910 Mon Sep 17 00:00:00 2001 From: Aaron Lu Date: Wed, 21 Nov 2012 23:33:40 +0100 Subject: [PATCH] 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 Signed-off-by: Rafael J. Wysocki --- drivers/acpi/scan.c | 9 ++++++++- include/acpi/acpi_bus.h | 6 ++++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 1fcb8678665c..da1416af0c8b 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -965,8 +965,10 @@ static int acpi_bus_get_power_flags(struct acpi_device *device) * D3hot is only valid if _PR3 present. */ if (ps->resources.count || - (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) + (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) { ps->flags.valid = 1; + ps->flags.os_accessible = 1; + } ps->power = -1; /* Unknown - driver assigned */ ps->latency = -1; /* Unknown - driver assigned */ @@ -982,6 +984,11 @@ static int acpi_bus_get_power_flags(struct acpi_device *device) if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; + /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ + if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || + device->power.flags.power_resources) + device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; + acpi_bus_init_power(device); return 0; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 80155fda517f..c3bc4511e0c0 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -201,6 +201,7 @@ struct acpi_device_power_flags { struct acpi_device_power_state { struct { u8 valid:1; + u8 os_accessible:1; u8 explicit_set:1; /* _PSx present? */ u8 reserved:6; } flags; @@ -500,6 +501,11 @@ static inline bool acpi_device_can_wakeup(struct acpi_device *adev) return adev->wakeup.flags.valid; } +static inline bool acpi_device_can_poweroff(struct acpi_device *adev) +{ + return adev->power.states[ACPI_STATE_D3_COLD].flags.os_accessible; +} + #else /* CONFIG_ACPI */ static inline int register_acpi_bus_type(void *bus) { return 0; } -- GitLab