media: uvcvideo: Undup use uvc_endpoint_max_bpi() code

Replace manual decoding of psize in uvc_parse_streaming(), with the code
from uvc_endpoint_max_bpi(). It also handles usb3 devices.
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/uvc/uvc_driver.c

@@ -1009,9 +1009,7 @@ static int uvc_parse_streaming(struct uvc_device *dev,
 				streaming->header.bEndpointAddress);
 		if (ep == NULL)
 			continue;
-
-		psize = le16_to_cpu(ep->desc.wMaxPacketSize);
-		psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+		psize = uvc_endpoint_max_bpi(dev->udev, ep);
 		if (psize > streaming->maxpsize)
 			streaming->maxpsize = psize;
 	}

drivers/media/usb/uvc/uvc_video.c

@@ -1754,8 +1754,7 @@ static void uvc_video_stop_transfer(struct uvc_streaming *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 uvc_endpoint_max_bpi(struct usb_device *dev, struct usb_host_endpoint *ep)
 {
 	u16 psize;
 

drivers/media/usb/uvc/uvcvideo.h

@@ -911,6 +911,7 @@ void uvc_simplify_fraction(u32 *numerator, u32 *denominator,
 u32 uvc_fraction_to_interval(u32 numerator, u32 denominator);
 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 					    u8 epaddr);
+u16 uvc_endpoint_max_bpi(struct usb_device *dev, struct usb_host_endpoint *ep);
 
 /* Quirks support */
 void uvc_video_decode_isight(struct uvc_urb *uvc_urb,