diff options
| -rw-r--r-- | drivers/gpu/drm/drm_atomic_uapi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c index e2373d1cfebc..e4c46a75af90 100644 --- a/drivers/gpu/drm/drm_atomic_uapi.c +++ b/drivers/gpu/drm/drm_atomic_uapi.c @@ -1265,8 +1265,10 @@ static int prepare_signaling(struct drm_device *dev, * Having this flag means user mode pends on event which will never * reach due to lack of at least one CRTC for signaling */ - if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) + if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) { + drm_dbg_atomic(dev, "need at least one CRTC for DRM_MODE_PAGE_FLIP_EVENT"); return -EINVAL; + } return 0; } |