PREFERRED_BPP     218 drivers/gpu/drm/exynos/exynos_drm_fbdev.c 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
PREFERRED_BPP     142 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);