From: Felipe Balbi <balbi@ti.com>
Date: Mon, 29 Sep 2014 18:41:04 +0000 (-0500)
Subject: usb: gadget: function: uvc: manage our video control endpoint
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=62e370785cb337981999ac7ec364e22ffb6c2cd3;p=deliverable%2Flinux.git

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 4138ad5adb77..413a09f366c4 100644
--- 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;