[PATCH 01/10] usb: phy-fsm: update OTG HNP state transition conditions according to OTG and EH 2.0 spec.

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According to:"On-The-Go and Embedded Host Supplement to the USB Revision 2.0
Specification July 27, 2012 Revision 2.0 version 1.1a"
- From a_host to a_wait_bcon if !b_conn
- Add transition from a_host to a_wait_vfall if id state is high or a_bus_drop
- From a_wait_vfall to a_idle if a_wait_vfall_tmout

Signed-off-by: Li Jun <b47624@xxxxxxxxxxxxx>
---
 drivers/usb/phy/phy-fsm-usb.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/phy/phy-fsm-usb.c b/drivers/usb/phy/phy-fsm-usb.c
index 7aa314e..c47e5a6 100644
--- a/drivers/usb/phy/phy-fsm-usb.c
+++ b/drivers/usb/phy/phy-fsm-usb.c
@@ -317,10 +317,12 @@ int otg_statemachine(struct otg_fsm *fsm)
 			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
 		break;
 	case OTG_STATE_A_HOST:
-		if ((!fsm->a_bus_req || fsm->a_suspend_req_inf) &&
+		if (fsm->id || fsm->a_bus_drop)
+			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
+		else if ((!fsm->a_bus_req || fsm->a_suspend_req_inf) &&
 				fsm->otg->host->b_hnp_enable)
 			otg_set_state(fsm, OTG_STATE_A_SUSPEND);
-		else if (fsm->id || !fsm->b_conn || fsm->a_bus_drop)
+		else if (!fsm->b_conn)
 			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
 		else if (!fsm->a_vbus_vld)
 			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
@@ -346,8 +348,7 @@ int otg_statemachine(struct otg_fsm *fsm)
 			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
 		break;
 	case OTG_STATE_A_WAIT_VFALL:
-		if (fsm->a_wait_vfall_tmout || fsm->id || fsm->a_bus_req ||
-				(!fsm->a_sess_vld && !fsm->b_conn))
+		if (fsm->a_wait_vfall_tmout)
 			otg_set_state(fsm, OTG_STATE_A_IDLE);
 		break;
 	case OTG_STATE_A_VBUS_ERR:
-- 
1.7.8


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