This patch adds the struct drm_crtc_helper_funcs with simple
atomic_check and atomic_enable functions.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiram...@gmail.com>
---
 drivers/gpu/drm/vkms/vkms_crtc.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index bf76cd39ece7..84cc05506b09 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -19,6 +19,22 @@ static const struct drm_crtc_funcs vkms_crtc_funcs = {
        .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 };
 
+static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
+                                 struct drm_crtc_state *state)
+{
+       return 0;
+}
+
+static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
+                                   struct drm_crtc_state *old_state)
+{
+}
+
+static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
+       .atomic_check  = vkms_crtc_atomic_check,
+       .atomic_enable = vkms_crtc_atomic_enable,
+};
+
 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
                   struct drm_plane *primary, struct drm_plane *cursor)
 {
@@ -31,5 +47,7 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc 
*crtc,
                return ret;
        }
 
+       drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
+
        return ret;
 }
-- 
2.17.1

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