PM: domains: Don't runtime resume devices at genpd_prepare()

Runtime resuming a device upfront in the genpd_prepare() callback,
to check if there is a wakeup pending for it, seems like an
unnecessary thing to do.

The PM core already manages these kind of things in a common way in
__device_suspend(), via calling pm_runtime_barrier() and
pm_wakeup_pending().

Therefore, let's simply drop this behaviour from genpd_prepare().

Note that, this change is applicable only for devices that are
attached to a genpd that has the GENPD_FLAG_ACTIVE_WAKEUP set
(Renesas, Mediatek, and Rockchip platforms). Moreover, a driver
that needs to restore power for its device to re-configure it
for a system wakeup, may still call pm_runtime_get_sync(), for
example, to do this.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 78c310d..b6a782c 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1088,34 +1088,6 @@ static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
 }
 
 /**
- * resume_needed - Check whether to resume a device before system suspend.
- * @dev: Device to check.
- * @genpd: PM domain the device belongs to.
- *
- * There are two cases in which a device that can wake up the system from sleep
- * states should be resumed by genpd_prepare(): (1) if the device is enabled
- * to wake up the system and it has to remain active for this purpose while the
- * system is in the sleep state and (2) if the device is not enabled to wake up
- * the system from sleep states and it generally doesn't generate wakeup signals
- * by itself (those signals are generated on its behalf by other parts of the
- * system).  In the latter case it may be necessary to reconfigure the device's
- * wakeup settings during system suspend, because it may have been set up to
- * signal remote wakeup from the system's working state as needed by runtime PM.
- * Return 'true' in either of the above cases.
- */
-static bool resume_needed(struct device *dev,
-                         const struct generic_pm_domain *genpd)
-{
-       bool active_wakeup;
-
-       if (!device_can_wakeup(dev))
-               return false;
-
-       active_wakeup = genpd_is_active_wakeup(genpd);
-       return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
-}
-
-/**
  * genpd_prepare - Start power transition of a device in a PM domain.
  * @dev: Device to start the transition of.
  *
@@ -1135,14 +1107,6 @@ static int genpd_prepare(struct device *dev)
        if (IS_ERR(genpd))
                return -EINVAL;
 
-       /*
-        * If a wakeup request is pending for the device, it should be woken up
-        * at this point and a system wakeup event should be reported if it's
-        * set up to wake up the system from sleep states.
-        */
-       if (resume_needed(dev, genpd))
-               pm_runtime_resume(dev);
-
        genpd_lock(genpd);
 
        if (genpd->prepared_count++ == 0)