1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index ab6e70eadc58..49404ce1666e 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -566,7 +566,9 @@ EXPORT_SYMBOL(drm_mode_height);
  * FIXME: why is this needed?  shouldn't vrefresh be set already?
  *
  * RETURNS:
- * Vertical refresh rate of @mode x 1000. For precision reasons.
+ * Vertical refresh rate. It will be the result of actual value plus 0.5.
+ * If it is 70.288, it will return 70Hz.
+ * If it is 59.6, it will return 60Hz.
  */
 int drm_mode_vrefresh(struct drm_display_mode *mode)
 {
@@ -576,14 +578,13 @@ int drm_mode_vrefresh(struct drm_display_mode *mode)
         if (mode->vrefresh > 0)
                 refresh = mode->vrefresh;
         else if (mode->htotal > 0 && mode->vtotal > 0) {
+                int vtotal;
+                vtotal = mode->vtotal;
                 /* work out vrefresh the value will be x1000 */
                 calc_val = (mode->clock * 1000);
-
                 calc_val /= mode->htotal;
-                calc_val *= 1000;
-                calc_val /= mode->vtotal;
+                refresh = (calc_val + vtotal / 2) / vtotal;
 
-                refresh = calc_val;
                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                         refresh *= 2;
                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)