[PATCH] drm: rcar-du: Make sure planes are created by VSP

[Jacopo Mondi]

On Gen3 platforms compositing planes are allocated  by VSP on behalf of
DRM/KMS.
If VSP support is not compiled in, vsp initialization stub routine is
called. Return an error from that stub to fail explicitly, otherwise
accessing planes leads to invalid memory errors.

Signed-off-by: Jacopo Mondi <jacopo+renesas at jmondi.org>
---
 drivers/gpu/drm/rcar-du/rcar_du_vsp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.h b/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
index 510dcc9..f1d0f18 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
@@ -68,7 +68,7 @@ void rcar_du_vsp_disable(struct rcar_du_crtc *crtc);
 void rcar_du_vsp_atomic_begin(struct rcar_du_crtc *crtc);
 void rcar_du_vsp_atomic_flush(struct rcar_du_crtc *crtc);
 #else
-static inline int rcar_du_vsp_init(struct rcar_du_vsp *vsp) { return 0; };
+static inline int rcar_du_vsp_init(struct rcar_du_vsp *vsp) { return -ENXIO; };
 static inline void rcar_du_vsp_enable(struct rcar_du_crtc *crtc) { };
 static inline void rcar_du_vsp_disable(struct rcar_du_crtc *crtc) { };
 static inline void rcar_du_vsp_atomic_begin(struct rcar_du_crtc *crtc) { };
-- 
2.7.4