usb: chipidea: otg: gadget module load and unload support

This patch is to support load and unload gadget driver in full OTG mode.

Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Tested-by: Jiada Wang <jiada_wang@mentor.com>
Cc: <stable@vger.kernel.org> #v4.0+

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 8223fe73ea85..391a1225b0ba 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1751,6 +1751,22 @@ static int ci_udc_start(struct usb_gadget *gadget,
         return retval;
 }
 
+static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
+{
+        if (!ci_otg_is_fsm_mode(ci))
+                return;
+
+        mutex_lock(&ci->fsm.lock);
+        if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
+                ci->fsm.a_bidl_adis_tmout = 1;
+                ci_hdrc_otg_fsm_start(ci);
+        } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
+                ci->fsm.protocol = PROTO_UNDEF;
+                ci->fsm.otg->state = OTG_STATE_UNDEFINED;
+        }
+        mutex_unlock(&ci->fsm.lock);
+}
+
 /**
  * ci_udc_stop: unregister a gadget driver
  */
@@ -1775,6 +1791,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
         ci->driver = NULL;
         spin_unlock_irqrestore(&ci->lock, flags);
 
+        ci_udc_stop_for_otg_fsm(ci);
         return 0;
 }