Chunfeng Yun 03f408a108
PM / wakeirq: support enabling wake-up irq after runtime_suspend called ...
[ Upstream commit 259714100d98b50bf04d36a21bf50ca8b829fc11 ]
When the dedicated wake IRQ is level trigger, and it uses the
device's low-power status as the wakeup source, that means if the
device is not in low-power state, the wake IRQ will be triggered
if enabled; For this case, need enable the wake IRQ after running
the device's ->runtime_suspend() which make it enter low-power state.
e.g.
Assume the wake IRQ is a low level trigger type, and the wakeup
signal comes from the low-power status of the device.
The wakeup signal is low level at running time (0), and becomes
high level when the device enters low-power state (runtime_suspend
(1) is called), a wakeup event at (2) make the device exit low-power
state, then the wakeup signal also becomes low level.
------------------
| ^ ^|
---------------- | | --------------
|<---(0)--->|<--(1)--| (3) (2) (4)
if enable the wake IRQ before running runtime_suspend during (0),
a wake IRQ will arise, it causes resume immediately;
it works if enable wake IRQ ( e.g. at (3) or (4)) after running
->runtime_suspend().
This patch introduces a new status WAKE_IRQ_DEDICATED_REVERSE to
optionally support enabling wake IRQ after running ->runtime_suspend().
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com >
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com >
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com >
Stable-dep-of: 8527beb12087 ("PM: sleep: wakeirq: fix wake irq arming")
Signed-off-by: Sasha Levin <sashal@kernel.org >
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