Function prototype or declaration at include/drm/drm_fb_helper.h, line 270 References: drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c, line 2105 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c, line 2107 drivers/gpu/drm/drm_fb_helper.c, line 2529 drivers/gpu/drm/drm_fb_helper.c, line 2571 drivers/gpu/drm/gud/gud_drv.c, line 632 drivers/gpu/drm/hyperv/hyperv_drm_drv.c, line 213 drivers/gpu/drm/imx/dcss/dcss-kms.c, line 151 drivers/gpu/drm/ingenic/ingenic-drm-drv.c, line 1391 drivers/gpu/drm/mediatek/mtk_drm_drv.c, line 421 drivers/gpu/drm/meson/meson_drv.c, line 353 drivers/gpu/drm/mgag200/mgag200_drv.c, line 366 drivers/gpu/drm/pl111/pl111_drv.c, line 311 drivers/gpu/drm/rcar-du/rcar_du_drv.c, line 684 drivers/gpu/drm/solomon/ssd130x.c, line 921 drivers/gpu/drm/stm/drv.c, line 206 drivers/gpu/drm/tiny/arcpgu.c, line 395 drivers/gpu/drm/tiny/bochs.c, line 666 drivers/gpu/drm/tiny/cirrus.c, line 604 drivers/gpu/drm/tiny/gm12u320.c, line 699 drivers/gpu/drm/tiny/ili9225.c, line 409 drivers/gpu/drm/tiny/repaper.c, line 1116 drivers/gpu/drm/tiny/st7586.c, line 358 drivers/gpu/drm/tiny/st7735r.c, line 245 drivers/gpu/drm/vc4/vc4_drv.c, line 359 include/drm/drm_fb_helper.h, line 270 include/drm/drm_fb_helper.h, line 446