drm/i915: do dynamic clock freq control only in kernel modesetting

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d7c7fa4..9aa1d2d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3472,6 +3472,9 @@
 	struct intel_framebuffer *intel_fb;
 	struct intel_crtc *intel_crtc;
 
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return;
+
 	dev_priv->busy = true;
 	intel_increase_renderclock(dev, true);