diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 0d7acd7..1fbd67c 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -727,6 +727,7 @@
 	temp &= ~PIPE_DDI_PORT_MASK;
 	temp &= ~PIPE_DDI_BPC_12;
 	temp &= ~PIPE_DDI_MODE_SELECT_MASK;
+	temp &= ~(PIPE_DDI_PVSYNC | PIPE_DDI_PHSYNC);
 	temp |= PIPE_DDI_SELECT_PORT(port) |
 			((intel_crtc->bpp > 24) ?
 				PIPE_DDI_BPC_12 :
@@ -738,6 +739,11 @@
 	else
 		temp |= PIPE_DDI_MODE_SELECT_DVI;
 
+	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
+		temp |= PIPE_DDI_PVSYNC;
+	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
+		temp |= PIPE_DDI_PHSYNC;
+
 	I915_WRITE(DDI_FUNC_CTL(pipe), temp);
 
 	intel_hdmi->set_infoframes(encoder, adjusted_mode);