[media] uvcvideo: Support super speed endpoints

Compute the maximum number of bytes per interval using the burst and
multiplier values for super speed endpoints.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/uvc/uvc_video.c

@@ -1438,6 +1438,26 @@ static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers)
 		uvc_free_urb_buffers(stream);
 }
 
+/*
+ * Compute the maximum number of bytes per interval for an endpoint.
+ */
+static unsigned int uvc_endpoint_max_bpi(struct usb_device *dev,
+					 struct usb_host_endpoint *ep)
+{
+	u16 psize;
+
+	switch (dev->speed) {
+	case USB_SPEED_SUPER:
+		return ep->ss_ep_comp.wBytesPerInterval;
+	case USB_SPEED_HIGH:
+		psize = usb_endpoint_maxp(&ep->desc);
+		return (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+	default:
+		psize = usb_endpoint_maxp(&ep->desc);
+		return psize & 0x07ff;
+	}
+}
+
 /*
  * Initialize isochronous URBs and allocate transfer buffers. The packet size
  * is given by the endpoint.
@@ -1450,8 +1470,7 @@ static int uvc_init_video_isoc(struct uvc_streaming *stream,
 	u16 psize;
 	u32 size;
 
-	psize = le16_to_cpu(ep->desc.wMaxPacketSize);
-	psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+	psize = uvc_endpoint_max_bpi(stream->dev->udev, ep);
 	size = stream->ctrl.dwMaxVideoFrameSize;
 
 	npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags);
@@ -1506,7 +1525,7 @@ static int uvc_init_video_bulk(struct uvc_streaming *stream,
 	u16 psize;
 	u32 size;
 
-	psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff;
+	psize = usb_endpoint_maxp(&ep->desc) & 0x7ff;
 	size = stream->ctrl.dwMaxPayloadTransferSize;
 	stream->bulk.max_payload_size = size;
 
@@ -1567,7 +1586,7 @@ static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags)
 
 	if (intf->num_altsetting > 1) {
 		struct usb_host_endpoint *best_ep = NULL;
-		unsigned int best_psize = 3 * 1024;
+		unsigned int best_psize = UINT_MAX;
 		unsigned int bandwidth;
 		unsigned int uninitialized_var(altsetting);
 		int intfnum = stream->intfnum;
@@ -1595,8 +1614,7 @@ static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags)
 				continue;
 
 			/* Check if the bandwidth is high enough. */
-			psize = le16_to_cpu(ep->desc.wMaxPacketSize);
-			psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+			psize = uvc_endpoint_max_bpi(stream->dev->udev, ep);
 			if (psize >= bandwidth && psize <= best_psize) {
 				altsetting = alts->desc.bAlternateSetting;
 				best_psize = psize;