---
 drivers/gpu/drm/radeon/radeon_display.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1144,6 +1144,7 @@ bool radeon_crtc_scaling_mode_fixup(stru
 			dst_v = radeon_crtc->native_mode.vdisplay;
 			src_h = crtc->mode.hdisplay;
 			dst_h = radeon_crtc->native_mode.vdisplay;
+			printk("dst_v CRTC:%d [%d]= %08x\n", crtc->base.id, __LINE__, dst_v);
 			/* copy native mode */
 			memcpy(&radeon_crtc->native_mode,
 			       &radeon_encoder->native_mode,
@@ -1160,6 +1161,7 @@ bool radeon_crtc_scaling_mode_fixup(stru
 				radeon_crtc->rmx_type = RMX_FULL;
 				src_v = crtc->mode.vdisplay;
 				dst_v = crtc->mode.vdisplay - (radeon_crtc->v_border * 2);
+				printk("dst_v CRTC:%d [%d]= %08x\n", crtc->base.id, __LINE__, dst_v);
 				src_h = crtc->mode.hdisplay;
 				dst_h = crtc->mode.hdisplay - (radeon_crtc->h_border * 2);
 			}
@@ -1181,9 +1183,27 @@ bool radeon_crtc_scaling_mode_fixup(stru
 		fixed20_12 a, b;
 		a.full = dfixed_const(src_v);
 		b.full = dfixed_const(dst_v);
+		if (!a.full) {
+			DRM_ERROR("a.full CRTC:%d [%d] = 0\n", crtc->base.id, __LINE__);
+			return false;
+		}
+		if (!b.full) {
+			DRM_ERROR("b.full CRTC:%d [%d] = 0\n", crtc->base.id, __LINE__);
+			return false;
+		}
+
 		radeon_crtc->vsc.full = dfixed_div(a, b);
 		a.full = dfixed_const(src_h);
 		b.full = dfixed_const(dst_h);
+		if (!a.full) {
+			DRM_ERROR("a.full CRTC:%d [%d] = 0\n", crtc->base.id, __LINE__);
+			return false;
+		}
+		if (!b.full) {
+			DRM_ERROR("b.full CRTC:%d [%d] = 0\n", crtc->base.id, __LINE__);
+			return false;
+		}
+
 		radeon_crtc->hsc.full = dfixed_div(a, b);
 	} else {
 		radeon_crtc->vsc.full = dfixed_const(1);