usb: gadget: function: uvc: manage our video control endpoint

just like any other endpoint, we must enable/disable
our video control endpoint based on calls to our
->set_alt() method.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 4138ad5..413a09f 100644 (file)
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -297,6 +297,19 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
                if (alt)
                        return -EINVAL;
 
+               if (uvc->control_ep->driver_data) {
+                       INFO(cdev, "reset UVC Control\n");
+                       usb_ep_disable(uvc->control_ep);
+                       uvc->control_ep->driver_data = NULL;
+               }
+
+               if (!uvc->control_ep->desc)
+                       if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep))
+                               return -EINVAL;
+
+               usb_ep_enable(uvc->control_ep);
+               uvc->control_ep->driver_data = uvc;
+
                if (uvc->state == UVC_STATE_DISCONNECTED) {
                        memset(&v4l2_event, 0, sizeof(v4l2_event));
                        v4l2_event.type = UVC_EVENT_CONNECT;