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authorHuang Ying <ying.huang@intel.com>2012-06-23 02:23:48 (GMT)
committerBjorn Helgaas <bhelgaas@google.com>2012-06-23 16:41:09 (GMT)
commitee85f543710dd56ce526cb44e39191f32972e5ad (patch)
tree13009358f0260d39c106b6708d6bb49f1d73279f /include/acpi
parentcfaf025112d3856637ff34a767ef785ef5cf2ca9 (diff)
downloadlinux-ee85f543710dd56ce526cb44e39191f32972e5ad.tar.xz
ACPI/PM: specify lowest allowed state for device sleep state
Lower device sleep state can save more power, but has more exit latency too. Sometimes, to satisfy some power QoS and other requirement, we need to constrain the lowest device sleep state. In this patch, a parameter to specify lowest allowed state for acpi_pm_device_sleep_state is added. So that the caller can enforce the constraint via the parameter. This is needed by PCIe D3cold support, where the lowest power state allowed may be D3_HOT instead of default D3_COLD. CC: Len Brown <lenb@kernel.org> CC: linux-acpi@vger.kernel.org Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/acpi_bus.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 9e6e1c6..16bd685 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -414,13 +414,13 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
int acpi_disable_wakeup_device_power(struct acpi_device *dev);
#ifdef CONFIG_PM
-int acpi_pm_device_sleep_state(struct device *, int *);
+int acpi_pm_device_sleep_state(struct device *, int *, int);
#else
-static inline int acpi_pm_device_sleep_state(struct device *d, int *p)
+static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
{
if (p)
*p = ACPI_STATE_D0;
- return ACPI_STATE_D3;
+ return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3) ? m : ACPI_STATE_D0;
}
#endif