[PATCH RFC 2/7] i3c: master: Report wakeup events for IBIs

[Adrian Hunter]

An I3C device configured as a wakeup source can wake the system by
generating an In-Band Interrupt (IBI).

When an IBI is queued for processing, record a wakeup event for the
device if wakeup is enabled.  Use a 100 ms processing interval to give
the I3C device driver time to process the IBI.

Signed-off-by: Adrian Hunter <adrian.hunter at intel.com>
---
 drivers/i3c/master.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index a47e2924bb70..a36f9b617cbf 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -2994,6 +2994,9 @@ static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master)
 	}
 }
 
+/* Approximate time for IBI handler to run */
+#define I3C_WAKEUP_PROCESSING_TIME_MS 100
+
 /**
  * i3c_master_queue_ibi() - Queue an IBI
  * @dev: the device this IBI is coming from
@@ -3007,6 +3010,9 @@ void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot)
 	if (!dev->ibi || !slot)
 		return;
 
+	if (device_may_wakeup(&dev->dev->dev))
+		pm_wakeup_event(&dev->dev->dev, I3C_WAKEUP_PROCESSING_TIME_MS);
+
 	atomic_inc(&dev->ibi->pending_ibis);
 	queue_work(dev->ibi->wq, &slot->work);
 }
-- 
2.53.0