tree: git://anongit.freedesktop.org/drm/drm-misc for-linux-next head: 6eca310e8924ab98c73b81dfd39e7dd553ceddfd commit: 6eca310e8924ab98c73b81dfd39e7dd553ceddfd [9/9] drm/nouveau/kms/nv50-: Add basic DPCD backlight support for nouveau config: arc-randconfig-r005-20210608 (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add drm-drm-misc git://anongit.freedesktop.org/drm/drm-misc git fetch --no-tags drm-drm-misc for-linux-next git checkout 6eca310e8924ab98c73b81dfd39e7dd553ceddfd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/gpu/drm/nouveau/dispnv50/disp.c: In function 'nv50_mstm_cleanup': drivers/gpu/drm/nouveau/dispnv50/disp.c:1390:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] 1390 | int ret; | ^~~ drivers/gpu/drm/nouveau/dispnv50/disp.c: In function 'nv50_mstm_prepare': drivers/gpu/drm/nouveau/dispnv50/disp.c:1414:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] 1414 | int ret; | ^~~ drivers/gpu/drm/nouveau/dispnv50/disp.c: In function 'nv50_sor_atomic_disable': 1665 | struct nouveau_backlight *backlight = nv_connector->backlight; | ^~ 1670 | if (backlight && backlight->uses_dpcd) { | ^~ drivers/gpu/drm/nouveau/dispnv50/disp.c: At top level: drivers/gpu/drm/nouveau/dispnv50/disp.c:2661:1: warning: no previous prototype for 'nv50_display_create' [-Wmissing-prototypes] 2661 | nv50_display_create(struct drm_device *dev) | ^~~~~~~~~~~~~~~~~~~ vim +1665 drivers/gpu/drm/nouveau/dispnv50/disp.c 1652 1653 /* TODO: Should we extend this to PWM-only backlights? 1654 * As well, should we add a DRM helper for waiting for the backlight to acknowledge 1655 * the panel backlight has been shut off? Intel doesn't seem to do this, and uses a 1656 * fixed time delay from the vbios… 1657 */ 1658 static void 1659 nv50_sor_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *state) 1660 { 1661 struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); 1662 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 1663 struct nouveau_crtc *nv_crtc = nouveau_crtc(nv_encoder->crtc); 1664 struct nouveau_connector *nv_connector = nv50_outp_get_old_connector(state, nv_encoder); 1666 struct drm_dp_aux *aux = &nv_connector->aux; 1667 int ret; 1668 u8 pwr; 1669 1671 ret = drm_edp_backlight_disable(aux, &backlight->edp_info); 1672 if (ret < 0) 1673 NV_ERROR(drm, "Failed to disable backlight on [CONNECTOR:%d:%s]: %d\n", 1674 nv_connector->base.base.id, nv_connector->base.name, ret); 1675 } 1676 1677 if (nv_encoder->dcb->type == DCB_OUTPUT_DP) { 1678 int ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr); 1679 1680 if (ret == 0) { 1681 pwr &= ~DP_SET_POWER_MASK; 1682 pwr |= DP_SET_POWER_D3; 1683 drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr); 1684 } 1685 } 1686 1687 nv_encoder->update(nv_encoder, nv_crtc->index, NULL, 0, 0); 1688 nv50_audio_disable(encoder, nv_crtc); 1689 nv50_hdmi_disable(&nv_encoder->base.base, nv_crtc); 1690 nv50_outp_release(nv_encoder); 1691 nv_encoder->crtc = NULL; 1692 } 1693 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org