media: cpia2: 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/cpia2/cpia2.h

@@ -350,7 +350,7 @@ struct cpia2_sbuf {
 };
 
 struct framebuf {
-	struct timeval timestamp;
+	u64 ts;
 	unsigned long seq;
 	int num;
 	int length;

drivers/media/usb/cpia2/cpia2_usb.c

@@ -324,7 +324,7 @@ static void cpia2_usb_complete(struct urb *urb)
 				continue;
 			}
 			DBG("Start of frame pattern found\n");
-			v4l2_get_timestamp(&cam->workbuff->timestamp);
+			cam->workbuff->ts = ktime_get_ns();
 			cam->workbuff->seq = cam->frame_count++;
 			cam->workbuff->data[0] = 0xFF;
 			cam->workbuff->data[1] = 0xD8;

drivers/media/usb/cpia2/cpia2_v4l.c

@@ -833,7 +833,7 @@ static int cpia2_querybuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 		break;
 	case FRAME_READY:
 		buf->bytesused = cam->buffers[buf->index].length;
-		buf->timestamp = cam->buffers[buf->index].timestamp;
+		buf->timestamp = ns_to_timeval(cam->buffers[buf->index].ts);
 		buf->sequence = cam->buffers[buf->index].seq;
 		buf->flags = V4L2_BUF_FLAG_DONE;
 		break;
@@ -889,12 +889,7 @@ static int find_earliest_filled_buffer(struct camera_data *cam)
 				found = i;
 			} else {
 				/* find which buffer is earlier */
-				struct timeval *tv1, *tv2;
-				tv1 = &cam->buffers[i].timestamp;
-				tv2 = &cam->buffers[found].timestamp;
-				if(tv1->tv_sec < tv2->tv_sec ||
-				   (tv1->tv_sec == tv2->tv_sec &&
-				    tv1->tv_usec < tv2->tv_usec))
+				if (cam->buffers[i].ts < cam->buffers[found].ts)
 					found = i;
 			}
 		}
@@ -945,7 +940,7 @@ static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 	buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE
 		| V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 	buf->field = V4L2_FIELD_NONE;
-	buf->timestamp = cam->buffers[buf->index].timestamp;
+	buf->timestamp = ns_to_timeval(cam->buffers[buf->index].ts);
 	buf->sequence = cam->buffers[buf->index].seq;
 	buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
 	buf->length = cam->frame_size;