Hi Alex, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 52d543b5497cf31d6baeb0bcfe5a5474c3238578 commit: 8fe44c080a53ac0ccbe88053a2e40f9acca33091 drm/amdgpu/display: fold DRM_AMD_DC_DCN3_1 into DRM_AMD_DC_DCN date: 9 months ago config: powerpc64-randconfig-r015-20220325 (https://download.01.org/0day-ci/archive/20220326/202203261919.vs4G6G1g-lkp@xxxxxxxxx/config) compiler: powerpc64-linux-gcc (GCC) 11.2.0 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fe44c080a53ac0ccbe88053a2e40f9acca33091 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 8fe44c080a53ac0ccbe88053a2e40f9acca33091 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/gpu/drm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_optc.c:95: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Enable CRTC vim +95 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_optc.c 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 93 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 94 /** 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 @95 * Enable CRTC 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 96 * Enable CRTC - call ASIC Control Object to enable Timing generator. 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 97 */ 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 98 static bool optc31_enable_crtc(struct timing_generator *optc) 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 99 { 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 100 struct optc *optc1 = DCN10TG_FROM_TG(optc); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 101 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 102 /* opp instance for OTG, 1 to 1 mapping and odm will adjust */ 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 103 REG_UPDATE(OPTC_DATA_SOURCE_SELECT, 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 104 OPTC_SEG0_SRC_SEL, optc->inst); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 105 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 106 /* VTG enable first is for HW workaround */ 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 107 REG_UPDATE(CONTROL, 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 108 VTG0_ENABLE, 1); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 109 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 110 REG_SEQ_START(); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 111 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 112 /* Enable CRTC */ 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 113 REG_UPDATE_2(OTG_CONTROL, 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 114 OTG_DISABLE_POINT_CNTL, 2, 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 115 OTG_MASTER_EN, 1); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 116 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 117 REG_SEQ_SUBMIT(); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 118 REG_SEQ_WAIT_DONE(); 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 119 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 120 return true; 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 121 } 110d3968fe9508 Nicholas Kazlauskas 2021-05-19 122 :::::: The code at line 95 was first introduced by commit :::::: 110d3968fe9508142cb76b530d141209efa169a8 drm/amd/display: Add DCN3.1 OPTC :::::: TO: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx> :::::: CC: Alex Deucher <alexander.deucher@xxxxxxx> -- 0-DAY CI Kernel Test Service https://01.org/lkp
