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authorSakari Ailus <sakari.ailus@linux.intel.com>2021-10-18 15:17:24 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-11-03 21:03:55 +0300
commitb340c7d6f619ad63d1896a6debceea1de3a78f29 (patch)
tree46d3bc3da58a46e1d5638f49fc08414a06ff6deb
parentc0d6586afa3546a3d148cf4b9d9a407b4f79d0bb (diff)
downloadlinux-b340c7d6f619ad63d1896a6debceea1de3a78f29.tar.xz
ACPI: scan: Obtain device's desired enumeration power state
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@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/acpi/scan.c4
-rw-r--r--include/acpi/acpi_bus.h1
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index dce2c291b982..a50f1967c73d 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1017,6 +1017,7 @@ 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 dsc = ACPI_STATE_D0;
u32 i;
/* Presence of _PS0|_PR0 indicates 'power manageable' */
@@ -1038,6 +1039,9 @@ 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, "_DSC", NULL, &dsc);
+ device->power.state_for_enumeration = dsc;
+
/*
* Enumerate supported power management states
*/
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 53b6e9f9de7b..480f9207a4c6 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -278,6 +278,7 @@ 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; /* Deepest power state for enumeration */
};
struct acpi_dep_data {