Hi Kuogee, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm/drm-next] [also build test WARNING on drm-intel/for-linux-next drm-tip/drm-tip drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next v5.17-rc4 next-20220215] [cannot apply to airlied/drm-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Kuogee-Hsieh/drm-msm-dp-enable-w... base: git://anongit.freedesktop.org/drm/drm drm-next config: hexagon-buildonly-randconfig-r005-20220216 (https://download.01.org/0day-ci/archive/20220216/202202161301.3AAqRD00-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0e628a783b935c70c80815db6c061ec84f884af5) 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 # https://github.com/0day-ci/linux/commit/294e6c4f98a10e815d8673f550f4470b0... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kuogee-Hsieh/drm-msm-dp-enable-widebus-feature-base-on-chip-hardware-revision/20220216-052636 git checkout 294e6c4f98a10e815d8673f550f4470b0b71e34d # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/gpu/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c:9: In file included from drivers/gpu/drm/msm/hdmi/hdmi.h:19: bool msm_dp_wide_bus_enable(struct msm_dp *dp_display) ^ drivers/gpu/drm/msm/msm_drv.h:453:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool msm_dp_wide_bus_enable(struct msm_dp *dp_display) ^ static 1 warning generated. -- In file included from drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c:9: bool msm_dp_wide_bus_enable(struct msm_dp *dp_display) ^ drivers/gpu/drm/msm/msm_drv.h:453:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool msm_dp_wide_bus_enable(struct msm_dp *dp_display) ^ static drivers/gpu/drm/msm/disp/mdp5/mdp5_mdss.c:29:20: warning: unused function 'mdss_write' [-Wunused-function] static inline void mdss_write(struct mdp5_mdss *mdp5_mdss, u32 reg, u32 data) ^ 2 warnings generated. -- In file included from drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c:17: bool msm_dp_wide_bus_enable(struct msm_dp *dp_display) ^ drivers/gpu/drm/msm/msm_drv.h:453:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool msm_dp_wide_bus_enable(struct msm_dp *dp_display) ^ static drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c:1155:26: warning: variable 'priv' set but not used [-Wunused-but-set-variable] struct msm_drm_private *priv; ^ drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c:1192:26: warning: variable 'priv' set but not used [-Wunused-but-set-variable] struct msm_drm_private *priv; ^ 3 warnings generated. vim +/msm_dp_wide_bus_enable +453 drivers/gpu/drm/msm/msm_drv.h 452 454 { 455 return false; 456 } 457 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org