media: usbvision: use u64 for the timestamp internally

Just like vb2 does, use u64 internally to store the timestamps
of the buffers. Only convert to timeval when interfacing with
userspace.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/usbvision/usbvision-core.c

@@ -1160,7 +1160,7 @@ static void usbvision_parse_data(struct usb_usbvision *usbvision)
 
 	if (newstate == parse_state_next_frame) {
 		frame->grabstate = frame_state_done;
-		v4l2_get_timestamp(&(frame->timestamp));
+		frame->ts = ktime_get_ns();
 		frame->sequence = usbvision->frame_num;
 
 		spin_lock_irqsave(&usbvision->queue_lock, lock_flags);

drivers/media/usb/usbvision/usbvision-video.c

@@ -706,7 +706,7 @@ static int vidioc_querybuf(struct file *file,
 	vb->length = usbvision->curwidth *
 		usbvision->curheight *
 		usbvision->palette.bytes_per_pixel;
-	vb->timestamp = usbvision->frame[vb->index].timestamp;
+	vb->timestamp = ns_to_timeval(usbvision->frame[vb->index].ts);
 	vb->sequence = usbvision->frame[vb->index].sequence;
 	return 0;
 }
@@ -775,7 +775,7 @@ static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *vb)
 		V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 	vb->index = f->index;
 	vb->sequence = f->sequence;
-	vb->timestamp = f->timestamp;
+	vb->timestamp = ns_to_timeval(f->ts);
 	vb->field = V4L2_FIELD_NONE;
 	vb->bytesused = f->scanlength;
 

drivers/media/usb/usbvision/usbvision.h

@@ -316,7 +316,7 @@ struct usbvision_frame {
 	long bytes_read;				/* amount of scanlength that has been read from data */
 	struct usbvision_v4l2_format_st v4l2_format;	/* format the user needs*/
 	int v4l2_linesize;				/* bytes for one videoline*/
-	struct timeval timestamp;
+	u64 ts;
 	int sequence;					/* How many video frames we send to user */
 };