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In such cases, the runtime PM core may not see > >> any recent activity and may suspend the device earlier than intended. > >> > >> Mark the controller as last busy whenever an IBI is queued (when > >> rpm_ibi_allowed is set) so that the auto-suspend delay correctly reflects > >> recent bus activity and avoids premature suspension. > > > > look like this can't resolve problem. pm_runtime_mark_last_busy() just > > change dev->power.last_busy. If suspend before it, nothing happen. > > It should be effective. > > rpm_suspend() recalculates the autosuspend expiry time based on > last_busy (see pm_runtime_autosuspend_expiration()) and restarts > the timer is it is in the future. > > > > > irq use thread irq, in irq thread call pm_runtime_resume() if needs. > > > > And this function call by irq handle, just put to work queue, what's impact > > if do nothing here? > > Just premature runtime suspension inconsistent with autosuspend_delay. CPU 0 CPU 1 1. rpm_suspend() 2. pm_runtime_mark_last_busy(master->rpm_dev) if 2 happen before 1, it can extend suspend. 2 happen after 1, it should do nothing. Frank > > > > > Frank > > > >> > >> Signed-off-by: Adrian Hunter > >> --- > >> drivers/i3c/master.c | 5 +++++ > >> 1 file changed, 5 insertions(+) > >> > >> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c > >> index bcc493dc9d04..dcc07ebc50a2 100644 > >> --- a/drivers/i3c/master.c > >> +++ b/drivers/i3c/master.c > >> @@ -2721,9 +2721,14 @@ static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master) > >> */ > >> void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) > >> { > >> + struct i3c_master_controller *master = i3c_dev_get_master(dev); > >> + > >> if (!dev->ibi || !slot) > >> return; > >> > >> + if (master->rpm_ibi_allowed) > >> + pm_runtime_mark_last_busy(master->rpm_dev); > >> + > >> atomic_inc(&dev->ibi->pending_ibis); > >> queue_work(dev->ibi->wq, &slot->work); > >> } > >> -- > >> 2.51.0 > >> >