staging: vboxvideo: remove dead gamma lut code

The redundant fb helpers .load_lut, .gamma_set and .gamma_get are
no longer used. Remove the dead code that was not doing anything
sensible anyway.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20170804104506.2414-1-peda@axentia.se

drivers/staging/vboxvideo/vbox_fb.c

@@ -317,22 +317,7 @@ static int vboxfb_create(struct drm_fb_helper *helper,
 	return 0;
 }
 
-static void vbox_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
-			      u16 blue, int regno)
-{
-}
-
-static void vbox_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
-			      u16 *blue, int regno)
-{
-	*red = regno;
-	*green = regno;
-	*blue = regno;
-}
-
 static struct drm_fb_helper_funcs vbox_fb_helper_funcs = {
-	.gamma_set = vbox_fb_gamma_set,
-	.gamma_get = vbox_fb_gamma_get,
 	.fb_probe = vboxfb_create,
 };
 

drivers/staging/vboxvideo/vbox_mode.c

@@ -134,10 +134,6 @@ static int vbox_set_view(struct drm_crtc *crtc)
 	return 0;
 }
 
-static void vbox_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 static void vbox_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 	struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
@@ -330,7 +326,6 @@ static const struct drm_crtc_helper_funcs vbox_crtc_helper_funcs = {
 	.mode_set = vbox_crtc_mode_set,
 	/* .mode_set_base = vbox_crtc_mode_set_base, */
 	.disable = vbox_crtc_disable,
-	.load_lut = vbox_crtc_load_lut,
 	.prepare = vbox_crtc_prepare,
 	.commit = vbox_crtc_commit,
 };