NB_CRTC 40 drivers/gpu/drm/stm/ltdc.c #define CRTC_MASK GENMASK(NB_CRTC - 1, 0) NB_CRTC 1272 drivers/gpu/drm/stm/ltdc.c ret = drm_vblank_init(ddev, NB_CRTC);