Hi Cai, Thank you for the patch! Yet something to improve: [auto build test ERROR on tegra/for-next] [also build test ERROR on v5.15-rc1 next-20210916] [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/Cai-Huoqing/drm-tegra-sor-Make-u... base: https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next config: arm-buildonly-randconfig-r002-20210916 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c8b3d7d6d6de37af68b2f379d0e37304f78e115f) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/a212d420986fc0e557d2ae8435995c700... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Cai-Huoqing/drm-tegra-sor-Make-use-of-the-helper-function-dev_err_probe/20210916-190458 git checkout a212d420986fc0e557d2ae8435995c7009754d40 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/tegra/ 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 >>): "cannot get AVDD I/O supply\n") ^ ; 1 error generated. vim +2969 drivers/gpu/drm/tegra/sor.c 2961 2962 static int tegra_sor_hdmi_probe(struct tegra_sor *sor) 2963 { 2964 int err; 2965 2966 sor->avdd_io_supply = devm_regulator_get(sor->dev, "avdd-io-hdmi-dp"); 2967 if (IS_ERR(sor->avdd_io_supply)) 2968 return dev_err_probe(sor->dev, PTR_ERR(sor->avdd_io_supply), 2970 2971 err = tegra_sor_enable_regulator(sor, sor->avdd_io_supply); 2972 if (err < 0) { 2973 dev_err(sor->dev, "failed to enable AVDD I/O supply: %d\n", 2974 err); 2975 return err; 2976 } 2977 2978 sor->vdd_pll_supply = devm_regulator_get(sor->dev, "vdd-hdmi-dp-pll"); 2979 if (IS_ERR(sor->vdd_pll_supply)) 2980 return dev_err_probe(sor->dev, PTR_ERR(sor->vdd_pll_supply), 2981 "cannot get VDD PLL supply\n"); 2982 2983 err = tegra_sor_enable_regulator(sor, sor->vdd_pll_supply); 2984 if (err < 0) { 2985 dev_err(sor->dev, "failed to enable VDD PLL supply: %d\n", 2986 err); 2987 return err; 2988 } 2989 2990 sor->hdmi_supply = devm_regulator_get(sor->dev, "hdmi"); 2991 if (IS_ERR(sor->hdmi_supply)) 2992 return dev_err_probe(sor->dev, PTR_ERR(sor->hdmi_supply), 2993 "cannot get HDMI supply\n"); 2994 2995 err = tegra_sor_enable_regulator(sor, sor->hdmi_supply); 2996 if (err < 0) { 2997 dev_err(sor->dev, "failed to enable HDMI supply: %d\n", err); 2998 return err; 2999 } 3000 3001 INIT_DELAYED_WORK(&sor->scdc, tegra_sor_hdmi_scdc_work); 3002 3003 return 0; 3004 } 3005 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org