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Subject[PATCH 4.3 097/125] usb: chipidea: otg: gadget module load and unload support
Date
4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Jun <B47624@freescale.com>

commit 85da852df66e5e0d3aba761b0fece7c958ff0685 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/chipidea/udc.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1751,6 +1751,22 @@ static int ci_udc_start(struct usb_gadge
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
ci->driver = NULL;
spin_unlock_irqrestore(&ci->lock, flags);

+ ci_udc_stop_for_otg_fsm(ci);
return 0;
}




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