drm/tve200: Use simple_display_pipe prepare_fb helper

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405154449.23038-4-daniel.vetter@ffwll.ch

drivers/gpu/drm/tve200/tve200_display.c

@@ -293,18 +293,12 @@ static void tve200_display_disable_vblank(struct drm_simple_display_pipe *pipe)
 	writel(0, priv->regs + TVE200_INT_EN);
 }
 
-static int tve200_display_prepare_fb(struct drm_simple_display_pipe *pipe,
-				    struct drm_plane_state *plane_state)
-{
-	return drm_gem_fb_prepare_fb(&pipe->plane, plane_state);
-}
-
 static const struct drm_simple_display_pipe_funcs tve200_display_funcs = {
 	.check = tve200_display_check,
 	.enable = tve200_display_enable,
 	.disable = tve200_display_disable,
 	.update = tve200_display_update,
-	.prepare_fb = tve200_display_prepare_fb,
+	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
 	.enable_vblank = tve200_display_enable_vblank,
 	.disable_vblank = tve200_display_disable_vblank,
 };