Function prototype or declaration at include/drm/drm_atomic_helper.h, line 74 References: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c, line 8842 drivers/gpu/drm/drm_atomic_helper.c, line 1131 drivers/gpu/drm/drm_atomic_helper.c, line 1190 drivers/gpu/drm/drm_atomic_helper.c, line 1294 drivers/gpu/drm/i915/display/intel_display.c, line 10661 drivers/gpu/drm/nouveau/dispnv50/disp.c, line 2105 include/drm/drm_atomic_helper.h, line 74