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259714100d
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>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/*
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* pm_wakeirq.h - Device wakeirq helper functions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_PM_WAKEIRQ_H
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#define _LINUX_PM_WAKEIRQ_H
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#ifdef CONFIG_PM
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extern int dev_pm_set_wake_irq(struct device *dev, int irq);
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extern int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq);
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extern int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq);
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extern void dev_pm_clear_wake_irq(struct device *dev);
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extern void dev_pm_enable_wake_irq(struct device *dev);
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extern void dev_pm_disable_wake_irq(struct device *dev);
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#else /* !CONFIG_PM */
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static inline int dev_pm_set_wake_irq(struct device *dev, int irq)
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{
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return 0;
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}
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static inline int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
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{
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return 0;
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}
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static inline int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq)
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{
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return 0;
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}
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static inline void dev_pm_clear_wake_irq(struct device *dev)
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{
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}
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static inline void dev_pm_enable_wake_irq(struct device *dev)
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{
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}
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static inline void dev_pm_disable_wake_irq(struct device *dev)
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{
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}
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#endif /* CONFIG_PM */
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#endif /* _LINUX_PM_WAKEIRQ_H */
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