diff options
| author | Li Jun <jun.li@freescale.com> | 2015-06-19 17:18:48 +0800 |
|---|---|---|
| committer | Li Jun <jun.li@freescale.com> | 2015-06-24 10:50:56 +0800 |
| commit | 8cbe0defd38a7c2a79336b228322e1b8c1f437e6 (patch) | |
| tree | 67ff262abe751fd97dc3a1c6fdbb3c733e639944 | |
| parent | 9c18e5893b59710187de19a7042b404070bf0486 (diff) | |
MLK-11132 usb: chipidea: otg: delay suspend for a_wait_vfall
While A device as peripheral ends session by a_bus_drop, it will go
back to host role by transition to a_wait_vfall state, then ehci
host driver may access portsc status after controller enters suspend
, this will result in system hang since its clock is gated off.
This patch use existing autosuspend to delay the controller suspend
if it comes to a_wait_vfall state.
Signed-off-by: Li Jun <jun.li@freescale.com>
(cherry picked from commit b140fa6803ef6ececec17e435212a960a3169cc2)
| -rw-r--r-- | drivers/usb/chipidea/otg_fsm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c index 98443c8ceecf..13fc169ef76d 100644 --- a/drivers/usb/chipidea/otg_fsm.c +++ b/drivers/usb/chipidea/otg_fsm.c @@ -726,7 +726,8 @@ int ci_otg_fsm_work(struct ci_hdrc *ci) */ ci_otg_queue_work(ci); } - } else if (ci->fsm.otg->state == OTG_STATE_A_HOST) { + } else if (ci->fsm.otg->state == OTG_STATE_A_HOST || + ci->fsm.otg->state == OTG_STATE_A_WAIT_VFALL) { pm_runtime_mark_last_busy(ci->dev); pm_runtime_put_autosuspend(ci->dev); return 0; |