From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Rework the ACPI PM domain's PM callbacks to avoid resuming devices
during system suspend (in order to modify their wakeup settings etc.)
if that isn't necessary.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
drivers/acpi/device_pm.c | 33 ++++++++++++++++++++++++++++++---
drivers/acpi/scan.c | 4 ++++
include/acpi/acpi_bus.h | 3 ++-
3 files changed, 36 insertions(+), 4 deletions(-)
Index: linux-pm/drivers/acpi/device_pm.c
===================================================================
--- linux-pm.orig/drivers/acpi/device_pm.c
+++ linux-pm/drivers/acpi/device_pm.c
@@ -907,6 +907,7 @@ int acpi_subsys_prepare(struct device *d
if (dev->power.ignore_children)
pm_runtime_resume(dev);
+ dev->power.resume_not_needed = true;
return pm_generic_prepare(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
@@ -914,13 +915,39 @@ EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
/**
* acpi_subsys_suspend - Run the device driver's suspend callback.
* @dev: Device to handle.
- *
- * Follow PCI and resume devices suspended at run time before running their
- * system suspend callbacks.
*/
int acpi_subsys_suspend(struct device *dev)
{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ u32 sys_target;
+
+ if (!adev || !pm_runtime_enabled_and_suspended(dev))
+ goto out;
+
+ if (!dev->power.resume_not_needed
+ || device_may_wakeup(dev) != !!adev->wakeup.prepare_count)
+ goto resume;
+
+ sys_target = acpi_target_system_state();
+ if (sys_target != ACPI_STATE_S0) {
+ int ret, state;
+
+ if (adev->power.flags.dsw_present)
+ goto resume;
+
+ ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
+ if (ret || state != adev->power.state)
+ goto resume;
+ }
+
+ dev->power.use_runtime_resume = true;
+ return 0;
+
+ resume:
pm_runtime_resume(dev);
+
+ out:
+ dev->power.resume_not_needed = false;
return pm_generic_suspend(dev);
}
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -261,7 +261,8 @@ struct acpi_device_power_flags {
u32 inrush_current:1; /* Serialize Dx->D0 */
u32 power_removed:1; /* Optimize Dx->D0 */
u32 ignore_parent:1; /* Power is independent of parent power state */
- u32 reserved:27;
+ u32 dsw_present:1; /* _DSW present? */
+ u32 reserved:26;
};
struct acpi_device_power_state {
Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -1551,9 +1551,13 @@ static void acpi_bus_get_power_flags(str
*/
if (acpi_has_method(device->handle, "_PSC"))
device->power.flags.explicit_get = 1;
+
if (acpi_has_method(device->handle, "_IRC"))
device->power.flags.inrush_current = 1;
+ if (acpi_has_method(device->handle, "_DSW"))
+ device->power.flags.dsw_present = 1;
+
/*
* Enumerate supported power management states
*/
--
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