MLK-10279-1 usb: common: otg-fsm: only signal connect after switching to peripheral

We should signal connect (pull up dp) after we have already
at peripheral mode, otherwise, the dp may be toggled due to
we reset controller or do disconnect during the initialization
for peripheral, then, the host may be confused during the
enumeration, eg, it finds the reset can't succeed, but the
device is still there, see below error message.

hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: cannot reset port 1 (err = -32)
hub 1-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
hub 1-0:1.0: unable to enumerate USB device on port 1

Signed-off-by: Peter Chen <peter.chen@freescale.com>
(cherry picked from commit b4b5728425454c1713d152855f09af9c9c12d78d)

diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
index df8a14b99840ec20d36697cc1ef2817b73619eee..0cc68b5743365dc6fa9e3bcdc4ae208e369014f6 100644 (file)
--- a/drivers/usb/common/usb-otg-fsm.c
+++ b/drivers/usb/common/usb-otg-fsm.c
@@ -154,9 +154,9 @@ static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
                break;
        case OTG_STATE_B_PERIPHERAL:
                otg_chrg_vbus(fsm, 0);
-               otg_loc_conn(fsm, 1);
                otg_loc_sof(fsm, 0);
                otg_set_protocol(fsm, PROTO_GADGET);
+               otg_loc_conn(fsm, 1);
                break;
        case OTG_STATE_B_WAIT_ACON:
                otg_chrg_vbus(fsm, 0);
@@ -219,10 +219,10 @@ static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
 
                break;
        case OTG_STATE_A_PERIPHERAL:
-               otg_loc_conn(fsm, 1);
                otg_loc_sof(fsm, 0);
                otg_set_protocol(fsm, PROTO_GADGET);
                otg_drv_vbus(fsm, 1);
+               otg_loc_conn(fsm, 1);
                otg_add_timer(fsm, A_BIDL_ADIS);
                break;
        case OTG_STATE_A_WAIT_VFALL: