tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.8 head: e5d099503c6aa0c43fa0962084d92fb15c0fd941 commit: d0278f2d39d1acf420a12d73deb786db20b05f55 [114/382] drm/amd/display: allow query ddc data over aux to be read only operation config: i386-randconfig-c001-20200817 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; coccinelle warnings: (new ones prefixed by >>) # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.8 git checkout d0278f2d39d1acf420a12d73deb786db20b05f55 vim +541 drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c 497 498 bool dal_ddc_service_query_ddc_data( 499 struct ddc_service *ddc, 500 uint32_t address, 501 uint8_t *write_buf, 502 uint32_t write_size, 503 uint8_t *read_buf, 504 uint32_t read_size) 505 { 506 bool success = true; 507 uint32_t payload_size = 508 dal_ddc_service_is_in_aux_transaction_mode(ddc) ? 509 DEFAULT_AUX_MAX_DATA_SIZE : EDID_SEGMENT_SIZE; 510 511 uint32_t write_payloads = 512 (write_size + payload_size - 1) / payload_size; 513 514 uint32_t read_payloads = 515 (read_size + payload_size - 1) / payload_size; 516 517 uint32_t payloads_num = write_payloads + read_payloads; 518 519 520 if (write_size > EDID_SEGMENT_SIZE || read_size > EDID_SEGMENT_SIZE) 521 return false; 522 523 if (!payloads_num) 524 return false; 525 526 /*TODO: len of payload data for i2c and aux is uint8!!!!, 527 * but we want to read 256 over i2c!!!!*/ 528 if (dal_ddc_service_is_in_aux_transaction_mode(ddc)) { 529 struct aux_payload payload; 530 531 payload.i2c_over_aux = true; 532 payload.address = address; 533 payload.reply = NULL; 534 payload.defer_delay = get_defer_delay(ddc); 535 536 if (write_size != 0) { 537 payload.write = true; 538 /* should not set mot (middle of transaction) to 0 539 * if there are pending read payloads 540 */ 542 payload.length = write_size; 543 payload.data = write_buf; 544 545 success = dal_ddc_submit_aux_command(ddc, &payload); 546 } 547 548 if (read_size != 0 && success) { 549 payload.write = false; 550 /* should set mot (middle of transaction) to 0 551 * since it is the last payload to send 552 */ 553 payload.mot = false; 554 payload.length = read_size; 555 payload.data = read_buf; 556 557 success = dal_ddc_submit_aux_command(ddc, &payload); 558 } 559 } else { 560 struct i2c_command command = {0}; 561 struct i2c_payloads payloads; 562 563 if (!dal_ddc_i2c_payloads_create(ddc->ctx, &payloads, payloads_num)) 564 return false; 565 566 command.payloads = dal_ddc_i2c_payloads_get(&payloads); 567 command.number_of_payloads = 0; 568 command.engine = DDC_I2C_COMMAND_ENGINE; 569 command.speed = ddc->ctx->dc->caps.i2c_speed_in_khz; 570 571 dal_ddc_i2c_payloads_add( 572 &payloads, address, write_size, write_buf, true); 573 574 dal_ddc_i2c_payloads_add( 575 &payloads, address, read_size, read_buf, false); 576 577 command.number_of_payloads = 578 dal_ddc_i2c_payloads_get_count(&payloads); 579 580 success = dm_helpers_submit_i2c( 581 ddc->ctx, 582 ddc->link, 583 &command); 584 585 dal_ddc_i2c_payloads_destroy(&payloads); 586 } 587 588 return success; 589 } 590 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org