diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index cc3cb5b63d44..1eaf513166a1 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -582,6 +582,7 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 {
 	struct mtk_crtc_state *state = to_mtk_crtc_state(crtc->state);
 	struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
+	unsigned long flags;
 
 	if (mtk_crtc->event && state->base.event)
 		DRM_ERROR("new event while there is still a pending event\n");
@@ -589,7 +590,11 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 	if (state->base.event) {
 		state->base.event->pipe = drm_crtc_index(crtc);
 		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+
+		spin_lock_irqsave(&crtc->dev->event_lock, flags);
 		mtk_crtc->event = state->base.event;
+		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+
 		state->base.event = NULL;
 	}
 }