Hi Chunfeng, On Thu, Apr 8, 2021 at 5:35 PM Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> wrote: > > When the dedicated wake irq is level trigger, enable it before > calling runtime_suspend, will trigger an interrupt. > > e.g. > for a low level trigger type, it's low level at running time (0), > and becomes high level when enters suspend (runtime_suspend (1) is > called), a wakeup signal at (2) make it become low level, wake irq > will be triggered. > > ------------------ > | ^ ^| > ---------------- | | -------------- > |<---(0)--->|<--(1)--| (3) (2) (4) > Can't we just use a falling edge type for this irq line? > if we enable the wake irq before calling runtime_suspend during (0), > an interrupt will arise, it causes resume immediately; > enable wake irq after calling runtime_suspend, e.g. at (3) or (4), > will works. > > This patch seems no side effect on edge trigger wake irq. > > Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> > --- > drivers/base/power/runtime.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c > index a46a7e30881b..796739a015a5 100644 > --- a/drivers/base/power/runtime.c > +++ b/drivers/base/power/runtime.c > @@ -619,12 +619,12 @@ static int rpm_suspend(struct device *dev, int rpmflags) > __update_runtime_status(dev, RPM_SUSPENDING); > > callback = RPM_GET_CALLBACK(dev, runtime_suspend); > - > - dev_pm_enable_wake_irq_check(dev, true); > retval = rpm_callback(callback, dev); > if (retval) > goto fail; > > + dev_pm_enable_wake_irq_check(dev, true); > + > no_callback: > __update_runtime_status(dev, RPM_SUSPENDED); > pm_runtime_deactivate_timer(dev); > @@ -659,7 +659,6 @@ static int rpm_suspend(struct device *dev, int rpmflags) > return retval; > > fail: > - dev_pm_disable_wake_irq_check(dev); > __update_runtime_status(dev, RPM_ACTIVE); > dev->power.deferred_resume = false; > wake_up_all(&dev->power.wait_queue); > -- > 2.18.0 >
