ENGR00323241 usb: chipidea: otg: delay 2s to decrease power.usage_count

There is 2s delay for controller resume from usb wakeup case already,
in OTG fsm mode, A-dev can start a new session via sys input file(means
not via usb wakeup), in this case, A-dev still need the 2s delay for
host root hub access registers, otherwise system will hang due to access
register at low power mode.

Signed-off-by: Li Jun <b47624@freescale.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index 6faab2a06053..f258860365cb 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -669,6 +669,10 @@ int ci_otg_fsm_work(struct ci_hdrc *ci)
                                  */
                                 ci_otg_queue_work(ci);
                         }
+                } else if (ci->transceiver->state == OTG_STATE_A_HOST) {
+                        if (!timer_pending(&ci->timer))
+                                pm_runtime_get(ci->dev);
+                        mod_timer(&ci->timer, jiffies + msecs_to_jiffies(2000));
                 }
         }
         pm_runtime_put_sync(ci->dev);