tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 0289630c4e708652f21372eaa22ef03b3234091c [79/1142] drm/kmb: Mipi DPHY initialization changes config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-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 # https://github.com/intel/linux-intel-lts/commit/0289630c4e708652f21372eaa... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout 0289630c4e708652f21372eaa22ef03b3234091c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): 67 | int kmb_display_clk_enable(void) | ^~~~~~~~~~~~~~~~~~~~~~ 375 | int kmb_atomic_helper_check(struct drm_device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/kmb_display_clk_enable +67 drivers/gpu/drm/kmb/kmb_drv.c 66 68 { 69 int ret = 0; 70 #ifdef LCD_TEST 71 ret = clk_prepare_enable(clk_lcd); 72 if (ret) { 73 DRM_ERROR("Failed to enable LCD clock: %d\n", ret); 74 return ret; 75 } 76 #endif 77 ret = clk_prepare_enable(clk_mipi); 78 if (ret) { 79 DRM_ERROR("Failed to enable MIPI clock: %d\n", ret); 80 return ret; 81 } 82 /* ret = clk_prepare_enable(clk_msscam); 83 if (ret) { 84 DRM_ERROR("Failed to enable MSSCAM clock: %d\n", ret); 85 return ret; 86 } 87 */ 88 89 ret = clk_prepare_enable(clk_mipi_ecfg); 90 if (ret) { 91 DRM_ERROR("Failed to enable MIPI_ECFG clock: %d\n", ret); 92 return ret; 93 } 94 95 ret = clk_prepare_enable(clk_mipi_cfg); 96 if (ret) { 97 DRM_ERROR("Failed to enable MIPI_CFG clock: %d\n", ret); 98 return ret; 99 } 100 DRM_INFO("SUCCESS : enabled LCD MIPI clocks\n"); 101 return 0; 102 } 103 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org