From b9e95fc65ededbec083aa91b4faa58ad992c0891 Mon Sep 17 00:00:00 2001 From: Rafael J. Wysocki Date: Wed, 19 Jun 2013 00:45:34 +0200 Subject: ACPI / LPSS: Power up LPSS devices during enumeration Commit 7cd8407 (ACPI / PM: Do not execute _PS0 for devices without _PSC during initialization) introduced a regression on some systems with Intel Lynxpoint Low-Power Subsystem (LPSS) where some devices need to be powered up during initialization, but their device objects in the ACPI namespace have _PS0 and _PS3 only (without _PSC or power resources). To work around this problem, make the ACPI LPSS driver power up devices it knows about by using a new helper function acpi_device_fix_up_power() that does all of the necessary sanity checks and calls acpi_dev_pm_explicit_set() to put the device into D0. Reported-and-tested-by: Mika Westerberg Signed-off-by: Rafael J. Wysocki --- include/acpi/acpi_bus.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/acpi/acpi_bus.h') diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 636c59f2003a..c13c919ab99e 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -382,6 +382,7 @@ const char *acpi_power_state_string(int state); int acpi_device_get_power(struct acpi_device *device, int *state); int acpi_device_set_power(struct acpi_device *device, int state); int acpi_bus_init_power(struct acpi_device *device); +int acpi_device_fix_up_power(struct acpi_device *device); int acpi_bus_update_power(acpi_handle handle, int *state_p); bool acpi_bus_power_manageable(acpi_handle handle); -- cgit v1.2.3