PM / wakeirq: support enabling wake-up irq after runtime_suspend called

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>

drivers/base/power/power.h

@@ -25,8 +25,10 @@ extern u64 pm_runtime_active_time(struct device *dev);
 
 #define WAKE_IRQ_DEDICATED_ALLOCATED	BIT(0)
 #define WAKE_IRQ_DEDICATED_MANAGED	BIT(1)
+#define WAKE_IRQ_DEDICATED_REVERSE	BIT(2)
 #define WAKE_IRQ_DEDICATED_MASK		(WAKE_IRQ_DEDICATED_ALLOCATED | \
-					 WAKE_IRQ_DEDICATED_MANAGED)
+					 WAKE_IRQ_DEDICATED_MANAGED | \
+					 WAKE_IRQ_DEDICATED_REVERSE)
 
 struct wake_irq {
 	struct device *dev;
@@ -39,7 +41,8 @@ extern void dev_pm_arm_wake_irq(struct wake_irq *wirq);
 extern void dev_pm_disarm_wake_irq(struct wake_irq *wirq);
 extern void dev_pm_enable_wake_irq_check(struct device *dev,
 					 bool can_change_status);
-extern void dev_pm_disable_wake_irq_check(struct device *dev);
+extern void dev_pm_disable_wake_irq_check(struct device *dev, bool cond_disable);
+extern void dev_pm_enable_wake_irq_complete(struct device *dev);
 
 #ifdef CONFIG_PM_SLEEP
 

drivers/base/power/runtime.c

@@ -645,6 +645,8 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 	if (retval)
 		goto fail;
 
+	dev_pm_enable_wake_irq_complete(dev);
+
  no_callback:
 	__update_runtime_status(dev, RPM_SUSPENDED);
 	pm_runtime_deactivate_timer(dev);
@@ -690,7 +692,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 	return retval;
 
  fail:
-	dev_pm_disable_wake_irq_check(dev);
+	dev_pm_disable_wake_irq_check(dev, true);
 	__update_runtime_status(dev, RPM_ACTIVE);
 	dev->power.deferred_resume = false;
 	wake_up_all(&dev->power.wait_queue);
@@ -873,7 +875,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
 
 	callback = RPM_GET_CALLBACK(dev, runtime_resume);
 
-	dev_pm_disable_wake_irq_check(dev);
+	dev_pm_disable_wake_irq_check(dev, false);
 	retval = rpm_callback(callback, dev);
 	if (retval) {
 		__update_runtime_status(dev, RPM_SUSPENDED);

drivers/base/power/wakeirq.c

@@ -142,24 +142,7 @@ static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
 	return IRQ_HANDLED;
 }
 
-/**
- * dev_pm_set_dedicated_wake_irq - Request a dedicated wake-up interrupt
- * @dev: Device entry
- * @irq: Device wake-up interrupt
- *
- * Unless your hardware has separate wake-up interrupts in addition
- * to the device IO interrupts, you don't need this.
- *
- * Sets up a threaded interrupt handler for a device that has
- * a dedicated wake-up interrupt in addition to the device IO
- * interrupt.
- *
- * The interrupt starts disabled, and needs to be managed for
- * the device by the bus code or the device driver using
- * dev_pm_enable_wake_irq() and dev_pm_disable_wake_irq()
- * functions.
- */
-int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
+static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned int flag)
 {
 	struct wake_irq *wirq;
 	int err;
@@ -197,7 +180,7 @@ int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
 	if (err)
 		goto err_free_irq;
 
-	wirq->status = WAKE_IRQ_DEDICATED_ALLOCATED;
+	wirq->status = WAKE_IRQ_DEDICATED_ALLOCATED | flag;
 
 	return err;
 
@@ -210,8 +193,57 @@ int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
 
 	return err;
 }
+
+
+/**
+ * dev_pm_set_dedicated_wake_irq - Request a dedicated wake-up interrupt
+ * @dev: Device entry
+ * @irq: Device wake-up interrupt
+ *
+ * Unless your hardware has separate wake-up interrupts in addition
+ * to the device IO interrupts, you don't need this.
+ *
+ * Sets up a threaded interrupt handler for a device that has
+ * a dedicated wake-up interrupt in addition to the device IO
+ * interrupt.
+ *
+ * The interrupt starts disabled, and needs to be managed for
+ * the device by the bus code or the device driver using
+ * dev_pm_enable_wake_irq*() and dev_pm_disable_wake_irq*()
+ * functions.
+ */
+int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
+{
+	return __dev_pm_set_dedicated_wake_irq(dev, irq, 0);
+}
 EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq);
 
+/**
+ * dev_pm_set_dedicated_wake_irq_reverse - Request a dedicated wake-up interrupt
+ *                                         with reverse enable ordering
+ * @dev: Device entry
+ * @irq: Device wake-up interrupt
+ *
+ * Unless your hardware has separate wake-up interrupts in addition
+ * to the device IO interrupts, you don't need this.
+ *
+ * Sets up a threaded interrupt handler for a device that has a dedicated
+ * wake-up interrupt in addition to the device IO interrupt. It sets
+ * the status of WAKE_IRQ_DEDICATED_REVERSE to tell rpm_suspend()
+ * to enable dedicated wake-up interrupt after running the runtime suspend
+ * callback for @dev.
+ *
+ * The interrupt starts disabled, and needs to be managed for
+ * the device by the bus code or the device driver using
+ * dev_pm_enable_wake_irq*() and dev_pm_disable_wake_irq*()
+ * functions.
+ */
+int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq)
+{
+	return __dev_pm_set_dedicated_wake_irq(dev, irq, WAKE_IRQ_DEDICATED_REVERSE);
+}
+EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq_reverse);
+
 /**
  * dev_pm_enable_wake_irq - Enable device wake-up interrupt
  * @dev: Device
@@ -282,27 +314,54 @@ void dev_pm_enable_wake_irq_check(struct device *dev,
 	return;
 
 enable:
+	if (!can_change_status || !(wirq->status & WAKE_IRQ_DEDICATED_REVERSE))
 		enable_irq(wirq->irq);
 }
 
 /**
  * dev_pm_disable_wake_irq_check - Checks and disables wake-up interrupt
  * @dev: Device
+ * @cond_disable: if set, also check WAKE_IRQ_DEDICATED_REVERSE
  *
  * Disables wake-up interrupt conditionally based on status.
  * Should be only called from rpm_suspend() and rpm_resume() path.
  */
-void dev_pm_disable_wake_irq_check(struct device *dev)
+void dev_pm_disable_wake_irq_check(struct device *dev, bool cond_disable)
 {
 	struct wake_irq *wirq = dev->power.wakeirq;
 
 	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))
 		return;
 
+	if (cond_disable && (wirq->status & WAKE_IRQ_DEDICATED_REVERSE))
+		return;
+
 	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED)
 		disable_irq_nosync(wirq->irq);
 }
 
+/**
+ * dev_pm_enable_wake_irq_complete - enable wake IRQ not enabled before
+ * @dev: Device using the wake IRQ
+ *
+ * Enable wake IRQ conditionally based on status, mainly used if want to
+ * enable wake IRQ after running ->runtime_suspend() which depends on
+ * WAKE_IRQ_DEDICATED_REVERSE.
+ *
+ * Should be only called from rpm_suspend() path.
+ */
+void dev_pm_enable_wake_irq_complete(struct device *dev)
+{
+	struct wake_irq *wirq = dev->power.wakeirq;
+
+	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))
+		return;
+
+	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED &&
+	    wirq->status & WAKE_IRQ_DEDICATED_REVERSE)
+		enable_irq(wirq->irq);
+}
+
 /**
  * dev_pm_arm_wake_irq - Arm device wake-up
  * @wirq: Device wake-up interrupt

include/linux/pm_wakeirq.h

@@ -17,8 +17,8 @@
 #ifdef CONFIG_PM
 
 extern int dev_pm_set_wake_irq(struct device *dev, int irq);
-extern int dev_pm_set_dedicated_wake_irq(struct device *dev,
-					 int irq);
+extern int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq);
+extern int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq);
 extern void dev_pm_clear_wake_irq(struct device *dev);
 extern void dev_pm_enable_wake_irq(struct device *dev);
 extern void dev_pm_disable_wake_irq(struct device *dev);
@@ -35,6 +35,11 @@ static inline int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
 	return 0;
 }
 
+static inline int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq)
+{
+	return 0;
+}
+
 static inline void dev_pm_clear_wake_irq(struct device *dev)
 {
 }