usb: chipidea: support runtime power management for otg fsm mode
This patch adds runtime power management support for otg fsm mode, since
A-device in a_idle state cannot detect data pulse irq after suspended, here
enable wakeup by connection before suspend to make it can be resumed by DP;
and handle wakeup from that state like SRP.
Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index 562e581..e3cf5be 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -225,6 +225,9 @@
return;
}
+ if (list_empty(active_timers))
+ pm_runtime_get(ci->dev);
+
timer->count = timer->expires;
list_add_tail(&timer->list, active_timers);
@@ -241,17 +244,22 @@
struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
struct list_head *active_timers = &ci->fsm_timer->active_timers;
+ int flag = 0;
if (t >= NUM_CI_OTG_FSM_TIMERS)
return;
list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list)
- if (tmp_timer == timer)
+ if (tmp_timer == timer) {
list_del(&timer->list);
+ flag = 1;
+ }
/* Disable 1ms irq if there is no any active timer */
- if (list_empty(active_timers))
+ if (list_empty(active_timers) && (flag == 1)) {
hw_write_otgsc(ci, OTGSC_1MSIE, 0);
+ pm_runtime_put(ci->dev);
+ }
}
/*
@@ -275,8 +283,10 @@
}
/* disable 1ms irq if there is no any timer active */
- if ((expired == 1) && list_empty(active_timers))
+ if ((expired == 1) && list_empty(active_timers)) {
hw_write_otgsc(ci, OTGSC_1MSIE, 0);
+ pm_runtime_put(ci->dev);
+ }
return expired;
}
@@ -585,6 +595,7 @@
ci->fsm.otg->state < OTG_STATE_A_IDLE)
return 0;
+ pm_runtime_get_sync(ci->dev);
if (otg_statemachine(&ci->fsm)) {
if (ci->fsm.otg->state == OTG_STATE_A_IDLE) {
/*
@@ -609,8 +620,13 @@
*/
ci_otg_queue_work(ci);
}
+ } else if (ci->fsm.otg->state == OTG_STATE_A_HOST) {
+ pm_runtime_mark_last_busy(ci->dev);
+ pm_runtime_put_autosuspend(ci->dev);
+ return 0;
}
}
+ pm_runtime_put_sync(ci->dev);
return 0;
}