kernel: log uvc prep ep state

scripts/kernel/uvc-debug.patch

@@ -1,6 +1,6 @@
 --- a/drivers/usb/gadget/function/uvc_video.c
 +++ b/drivers/usb/gadget/function/uvc_video.c
-@@ -503,9 +503,17 @@
+@@ -503,9 +503,22 @@
  	unsigned int max_req_size, req_size, header_size;
  	unsigned int nreq;
  
@@ -10,6 +10,11 @@
 +
  	max_req_size = video->max_req_size;
  
++	uvcg_info(&uvc->func,
++		"Video prep ep: ep=%p desc=%p maxpacket=%u maxburst=%u mult=%u\n",
++		video->ep, video->ep->desc, video->ep->maxpacket,
++		video->ep->maxburst, video->ep->mult);
++
  	if (!usb_endpoint_xfer_isoc(video->ep->desc)) {
 +		uvcg_info(&uvc->func,
 +			"Video prep non-isoc: attrs=0x%x max_req=%u imagesize=%u interval=%u\n",
@@ -18,7 +23,7 @@
  		video->req_size = max_req_size;
  		video->reqs_per_frame = video->uvc_num_requests =
  			DIV_ROUND_UP(video->imagesize, max_req_size);
-@@ -534,6 +542,16 @@
+@@ -534,6 +547,16 @@
  	}
  	video->req_size = req_size;
  
@@ -35,7 +40,7 @@
  	/* We need to compensate the amount of requests to be
  	 * allocated with the maximum amount of zero length requests.
  	 * Since it is possible that hw_submit will initially
-@@ -558,6 +576,11 @@
+@@ -558,6 +581,11 @@
  	 */
  	uvc_video_prep_requests(video);
  
@@ -47,7 +52,7 @@
  	for (i = 0; i < video->uvc_num_requests; i++) {
  		ureq = kzalloc(sizeof(struct uvc_request), GFP_KERNEL);
  		if (ureq == NULL)
-@@ -764,20 +787,70 @@
+@@ -764,20 +792,70 @@
  {
  	int ret;