usb: chipidea: otg: gadget module load and unload support (85da852d) · Commits · 戴 / test

This patch is to support load and unload gadget driver in full OTG mode. Signed-off-by:

Jiada Wang <jiada_wang@mentor.com> Cc: <stable@vger.kernel.org> #v4.0+

drivers/usb/chipidea/udc.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}