1 files changed, 2 insertions, 6 deletions
diff --git a/src/r6xx_accel.c b/src/r6xx_accel.c
index 94678a1b..d1a50858 100644
--- a/src/r6xx_accel.c
+++ b/src/r6xx_accel.c
@@ -364,16 +364,12 @@ r600_cp_wait_vline_sync(ScrnInfoPtr pScrn, drmBufPtr ib, PixmapPtr pPix,
 	    return;
     }
 
-    start = max(start, 0);
-    stop = min(stop, crtc->mode.VDisplay);
+    start = max(start, crtc->y);
+    stop = min(stop, crtc->y + crtc->mode.VDisplay);
 
     if (start >= stop)
         return;
 
-    /* on r5xx+ vline starts at viewport_y */
-    start += crtc->y;
-    stop += crtc->y;
-
 #if defined(XF86DRM_MODE)
     if (info->cs) {
 	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;