[PATCH] drm/sun4i : constify drm_plane_helper_funcs

[Arvind Yadav]

drm_plane_helper_funcs are not supposed to change at runtime.
All functions working with drm_plane_helper_funcs provided by
<drm/drm_plane_helper.h> work with const drm_plane_helper_funcs.
So mark the non-const structs as const.

File size before:
   text    data     bss     dec     hex filename
    981      40       0    1021     3fd drivers/gpu/drm/sun4i/sun4i_layer.o

File size After adding 'const':
   text    data     bss     dec     hex filename
   1021       0       0    1021     3fd drivers/gpu/drm/sun4i/sun4i_layer.o

Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
---
 drivers/gpu/drm/sun4i/sun4i_layer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c 
b/drivers/gpu/drm/sun4i/sun4i_layer.c
index f26bde5..6191aac 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -52,7 +52,7 @@ static void sun4i_backend_layer_atomic_update(struct 
drm_plane *plane,
        sun4i_backend_layer_enable(backend, layer->id, true);
 }
 
-static struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
+static const struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
        .atomic_check   = sun4i_backend_layer_atomic_check,
        .atomic_disable = sun4i_backend_layer_atomic_disable,
        .atomic_update  = sun4i_backend_layer_atomic_update,
-- 
2.7.4