ACPI / sleep: Introduce CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT

ACPI 5.1 does not currently support S states for ARM64 hardware but
ACPI code will call acpi_target_system_state() and acpi_sleep_init()
for device power management, so introduce
CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT and select it for x86 and
ia64 only to make sleep functions available, and also introduce stub
function to allow other drivers to function until S states are defined
for ARM64.

It will be no functional change for x86 and IA64.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 074e52b..cc3414f 100644 (file)
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -10,6 +10,7 @@ config IA64
        select ARCH_MIGHT_HAVE_PC_SERIO
        select PCI if (!IA64_HP_SIM)
        select ACPI if (!IA64_HP_SIM)
+       select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
        select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
        select HAVE_UNSTABLE_SCHED_CLOCK
        select HAVE_IDE

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b7d31ca..c3ea9f9 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -22,6 +22,7 @@ config X86_64
 ### Arch settings
 config X86
        def_bool y
+       select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
        select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
        select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
        select ARCH_HAS_FAST_MULTIPLIER

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index e6c3ddd..a726381 100644 (file)
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -48,9 +48,13 @@ config ACPI_LEGACY_TABLES_LOOKUP
 config ARCH_MIGHT_HAVE_ACPI_PDC
        bool
 
+config ACPI_SYSTEM_POWER_STATES_SUPPORT
+       bool
+
 config ACPI_SLEEP
        bool
        depends on SUSPEND || HIBERNATION
+       depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
        default y
 
 config ACPI_PROCFS_POWER

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 623b117..db153c6 100644 (file)
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -23,7 +23,7 @@ acpi-y                                += nvs.o
 
 # Power management related files
 acpi-y                         += wakeup.o
-acpi-y                         += sleep.o
+acpi-$(CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT) += sleep.o
 acpi-y                         += device_pm.o
 acpi-$(CONFIG_ACPI_SLEEP)      += proc.o
 

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 56b321a..ba4a61e 100644 (file)
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -161,7 +161,11 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
 /*--------------------------------------------------------------------------
                                   Suspend/Resume
   -------------------------------------------------------------------------- */
+#ifdef CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT
 extern int acpi_sleep_init(void);
+#else
+static inline int acpi_sleep_init(void) { return -ENXIO; }
+#endif
 
 #ifdef CONFIG_ACPI_SLEEP
 int acpi_sleep_proc_init(void);