usb: dwc2: gadget: avoid stop disabled interrupt ep

When we test RK3308 USB gadget with UAC + HID composite
function, connect to PC USB Host, and do hotplug test.
The HID may fail to do ep in transfer. It's because that
when USB disconnect, the dwc2 call dwc2_hsotg_ep_disable()
to disable all enabled endpoints. However, for HID in ep,
the dwc2 call dwc2_hsotg_ep_stop_xfr() to stop transfer
even if the HID in ep has been disabled. This cause HID
in ep transfer fail when USB connect next time.

Fixes: 0ba9849 ("usb: dwc2: gadget: stop isoc ep in transfer when disable ep")
Signed-off-by: William Wu <william.wu@rock-chips.com>
Change-Id: I316410ec8ff30cf5e298cfcad327456dbae4e970

Author: wuliangfeng

drivers/usb/dwc2/gadget.c

@@ -3330,7 +3330,8 @@ static int dwc2_hsotg_ep_disable(struct usb_ep *ep)
 	ctrl = dwc2_readl(hsotg->regs + epctrl_reg);
 
 	/* stop isoc ep in transfer even if the ep is disabled */
-	if ((ctrl & DXEPCTL_EPENA) || (dir_in && (ctrl & DXEPCTL_EPTYPE_ISO)))
+	if ((ctrl & DXEPCTL_EPENA) ||
+	    (dir_in && ((ctrl & DXEPCTL_EPTYPE_MASK) == DXEPCTL_EPTYPE_ISO)))
 		dwc2_hsotg_ep_stop_xfr(hsotg, hs_ep);
 
 	ctrl &= ~DXEPCTL_EPENA;