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-rw-r--r--include/drm/drm_modeset_helper_vtables.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
index cfb7be40bed7..ce4de6b1e444 100644
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -418,6 +418,8 @@ struct drm_crtc_helper_funcs {
* Drivers can use the @old_crtc_state input parameter if the operations
* needed to enable the CRTC don't depend solely on the new state but
* also on the transition between the old state and the new state.
+ *
+ * This function is optional.
*/
void (*atomic_enable)(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state);
@@ -441,6 +443,8 @@ struct drm_crtc_helper_funcs {
* parameter @old_crtc_state which could be used to access the old
* state. Atomic drivers should consider to use this one instead
* of @disable.
+ *
+ * This function is optional.
*/
void (*atomic_disable)(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state);