[PATCH v10 1/7] ACPI: scan: Obtain device's desired enumeration power state

[Sakari Ailus]

Store a device's desired enumeration power state in struct
acpi_device_power during acpi_device object's initialisation.

Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
 drivers/acpi/scan.c     | 4 ++++
 include/acpi/acpi_bus.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 1d7a02ee45e05..cdff32f297122 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -987,6 +987,7 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 
 static void acpi_bus_get_power_flags(struct acpi_device *device)
 {
+	unsigned long long dse = ACPI_STATE_D0;
 	u32 i;
 
 	/* Presence of _PS0|_PR0 indicates 'power manageable' */
@@ -1008,6 +1009,9 @@ static void acpi_bus_get_power_flags(struct acpi_device *device)
 	if (acpi_has_method(device->handle, "_DSW"))
 		device->power.flags.dsw_present = 1;
 
+	acpi_evaluate_integer(device->handle, "_DSE", NULL, &dse);
+	device->power.state_for_enumeration = dse;
+
 	/*
 	 * Enumerate supported power management states
 	 */
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 02a716a0af5d4..becfc9f57002b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -276,6 +276,7 @@ struct acpi_device_power {
 	int state;		/* Current state */
 	struct acpi_device_power_flags flags;
 	struct acpi_device_power_state states[ACPI_D_STATE_COUNT];	/* Power states (D0-D3Cold) */
+	u8 state_for_enumeration; /* Maximum power state for enumeration */
 };
 
 /* Performance Management */
-- 
2.20.1