tree: https://gitlab.freedesktop.org/agd5f/linux.git drm-next head: 234a296b97ec6cee59f2051aaa243192c60ff705 commit: 56aca23093019843e881e458f005569ce9e96c47 [64/84] drm/amd/display: Add AUX I2C tracing. config: arc-randconfig-r012-20210809 (attached as .config) compiler: arceb-elf-gcc (GCC) 10.3.0 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 agd5f https://gitlab.freedesktop.org/agd5f/linux.git git fetch --no-tags agd5f drm-next git checkout 56aca23093019843e881e458f005569ce9e96c47 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 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 warnings (new ones prefixed by >>): drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_aux.c: In function 'dce_aux_transfer_with_retries': 775 | "dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER"); | ^ drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_aux.c:783:99: warning: suggest braces around empty body in an 'if' statement [-Wempty-body] 783 | "dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK"); | ^ vim +/if +775 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_aux.c 682 683 bool dce_aux_transfer_with_retries(struct ddc_service *ddc, 684 struct aux_payload *payload) 685 { 686 int i, ret = 0; 687 uint8_t reply; 688 bool payload_reply = true; 689 enum aux_return_code_type operation_result; 690 bool retry_on_defer = false; 691 struct ddc *ddc_pin = ddc->ddc_pin; 692 struct dce_aux *aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en]; 693 struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(aux_engine); 694 uint32_t defer_time_in_ms = 0; 695 696 int aux_ack_retries = 0, 697 aux_defer_retries = 0, 698 aux_i2c_defer_retries = 0, 699 aux_timeout_retries = 0, 700 aux_invalid_reply_retries = 0; 701 702 if (!payload->reply) { 703 payload_reply = false; 704 payload->reply = &reply; 705 } 706 707 for (i = 0; i < AUX_MAX_RETRIES; i++) { 708 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION, 709 LOG_FLAG_I2cAux_DceAux, 710 "dce_aux_transfer_with_retries: link_index=%u: START: retry %d of %d: address=0x%04x length=%u write=%d mot=%d", 711 ddc && ddc->link ? ddc->link->link_index : UINT_MAX, 712 i + 1, 713 (int)AUX_MAX_RETRIES, 714 payload->address, 715 payload->length, 716 (unsigned int) payload->write, 717 (unsigned int) payload->mot); 718 if (payload->write) 719 dce_aux_log_payload(" write", payload->data, payload->length, 16); 720 ret = dce_aux_transfer_raw(ddc, payload, &operation_result); 721 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION, 722 LOG_FLAG_I2cAux_DceAux, 723 "dce_aux_transfer_with_retries: link_index=%u: END: retry %d of %d: address=0x%04x length=%u write=%d mot=%d: ret=%d operation_result=%d payload->reply=%u", 724 ddc && ddc->link ? ddc->link->link_index : UINT_MAX, 725 i + 1, 726 (int)AUX_MAX_RETRIES, 727 payload->address, 728 payload->length, 729 (unsigned int) payload->write, 730 (unsigned int) payload->mot, 731 ret, 732 (int)operation_result, 733 (unsigned int) *payload->reply); 734 if (!payload->write) 735 dce_aux_log_payload(" read", payload->data, ret > 0 ? ret : 0, 16); 736 737 switch (operation_result) { 738 case AUX_RET_SUCCESS: 739 aux_timeout_retries = 0; 740 aux_invalid_reply_retries = 0; 741 742 switch (*payload->reply) { 743 case AUX_TRANSACTION_REPLY_AUX_ACK: 744 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION, 745 LOG_FLAG_I2cAux_DceAux, 746 "dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_ACK"); 747 if (!payload->write && payload->length != ret) { 748 if (++aux_ack_retries >= AUX_MAX_RETRIES) { 749 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR, 750 LOG_FLAG_Error_I2cAux, 751 "dce_aux_transfer_with_retries: FAILURE: aux_ack_retries=%d >= AUX_MAX_RETRIES=%d", 752 aux_defer_retries, 753 AUX_MAX_RETRIES); 754 goto fail; 755 } else { 756 udelay(300); 757 } 758 } else 759 return true; 760 break; 761 762 case AUX_TRANSACTION_REPLY_AUX_DEFER: 763 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION, 764 LOG_FLAG_I2cAux_DceAux, 765 "dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_DEFER"); 766 767 /* polling_timeout_period is in us */ 768 defer_time_in_ms += aux110->polling_timeout_period / 1000; 769 ++aux_defer_retries; 770 fallthrough; 771 case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER: 772 if (*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER) 773 DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION, 774 LOG_FLAG_I2cAux_DceAux, --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org