Hi Hsin-Yi, Thank you for the patch! Yet something to improve: [auto build test ERROR on drm-tip/drm-tip] [cannot apply to drm/drm-next robh/for-next drm-intel/for-linux-next v5.16 next-20220118] [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/Hsin-Yi-Wang/drm-bridge-anx7625-... base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: i386-randconfig-r024-20220117 (https://download.01.org/0day-ci/archive/20220120/202201201223.sts9AtBC-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/61809df270082584886188b067ee19744... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Hsin-Yi-Wang/drm-bridge-anx7625-send-DPCD-command-to-downstream/20220119-231952 git checkout 61809df270082584886188b067ee19744f4b35e1 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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 >>): ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_i2c_probe': vim +2648 drivers/gpu/drm/bridge/analogix/anx7625.c 2574 2575 static int anx7625_i2c_probe(struct i2c_client *client, 2576 const struct i2c_device_id *id) 2577 { 2578 struct anx7625_data *platform; 2579 struct anx7625_platform_data *pdata; 2580 int ret = 0; 2581 struct device *dev = &client->dev; 2582 2583 if (!i2c_check_functionality(client->adapter, 2584 I2C_FUNC_SMBUS_I2C_BLOCK)) { 2585 DRM_DEV_ERROR(dev, "anx7625's i2c bus doesn't support\n"); 2586 return -ENODEV; 2587 } 2588 2589 platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL); 2590 if (!platform) { 2591 DRM_DEV_ERROR(dev, "fail to allocate driver data\n"); 2592 return -ENOMEM; 2593 } 2594 2595 pdata = &platform->pdata; 2596 2597 platform->client = client; 2598 i2c_set_clientdata(client, platform); 2599 2600 pdata->supplies[0].supply = "vdd10"; 2601 pdata->supplies[1].supply = "vdd18"; 2602 pdata->supplies[2].supply = "vdd33"; 2603 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pdata->supplies), 2604 pdata->supplies); 2605 if (ret) { 2606 DRM_DEV_ERROR(dev, "fail to get power supplies: %d\n", ret); 2607 return ret; 2608 } 2609 anx7625_init_gpio(platform); 2610 2611 mutex_init(&platform->lock); 2612 mutex_init(&platform->hdcp_wq_lock); 2613 2614 INIT_DELAYED_WORK(&platform->hdcp_work, hdcp_check_work_func); 2615 platform->hdcp_workqueue = create_workqueue("hdcp workqueue"); 2616 if (!platform->hdcp_workqueue) { 2617 dev_err(dev, "fail to create work queue\n"); 2618 ret = -ENOMEM; 2619 return ret; 2620 } 2621 2622 platform->pdata.intp_irq = client->irq; 2623 if (platform->pdata.intp_irq) { 2624 INIT_WORK(&platform->work, anx7625_work_func); 2625 platform->workqueue = alloc_workqueue("anx7625_work", 2626 WQ_FREEZABLE | WQ_MEM_RECLAIM, 1); 2627 if (!platform->workqueue) { 2628 DRM_DEV_ERROR(dev, "fail to create work queue\n"); 2629 ret = -ENOMEM; 2630 goto free_hdcp_wq; 2631 } 2632 2633 ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq, 2634 NULL, anx7625_intr_hpd_isr, 2635 IRQF_TRIGGER_FALLING | 2636 IRQF_ONESHOT, 2637 "anx7625-intp", platform); 2638 if (ret) { 2639 DRM_DEV_ERROR(dev, "fail to request irq\n"); 2640 goto free_wq; 2641 } 2642 } 2643 2644 platform->aux.name = "anx7625-aux"; 2645 platform->aux.dev = dev; 2646 platform->aux.transfer = anx7625_aux_transfer; 2647 drm_dp_aux_init(&platform->aux); 2649 2650 ret = anx7625_parse_dt(dev, pdata); 2651 if (ret) { 2652 if (ret != -EPROBE_DEFER) 2653 DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret); 2654 return ret; 2655 } 2656 2657 if (anx7625_register_i2c_dummy_clients(platform, client) != 0) { 2658 ret = -ENOMEM; 2659 DRM_DEV_ERROR(dev, "fail to reserve I2C bus.\n"); 2660 goto free_wq; 2661 } 2662 2663 pm_runtime_enable(dev); 2664 pm_runtime_set_autosuspend_delay(dev, 1000); 2665 pm_runtime_use_autosuspend(dev); 2666 pm_suspend_ignore_children(dev, true); 2667 ret = devm_add_action_or_reset(dev, anx7625_runtime_disable, dev); 2668 if (ret) 2669 return ret; 2670 2671 if (!platform->pdata.low_power_mode) { 2672 anx7625_disable_pd_protocol(platform); 2673 pm_runtime_get_sync(dev); 2674 } 2675 2676 /* Add work function */ 2677 if (platform->pdata.intp_irq) 2678 queue_work(platform->workqueue, &platform->work); 2679 2680 platform->bridge.funcs = &anx7625_bridge_funcs; 2681 platform->bridge.of_node = client->dev.of_node; 2682 if (!anx7625_of_panel_on_aux_bus(&client->dev)) 2683 platform->bridge.ops |= DRM_BRIDGE_OP_EDID; 2684 if (!platform->pdata.panel_bridge) 2685 platform->bridge.ops |= DRM_BRIDGE_OP_HPD | 2686 DRM_BRIDGE_OP_DETECT; 2687 platform->bridge.type = platform->pdata.panel_bridge ? 2688 DRM_MODE_CONNECTOR_eDP : 2689 DRM_MODE_CONNECTOR_DisplayPort; 2690 2691 drm_bridge_add(&platform->bridge); 2692 2693 if (!platform->pdata.is_dpi) { 2694 ret = anx7625_attach_dsi(platform); 2695 if (ret) { 2696 DRM_DEV_ERROR(dev, "Fail to attach to dsi : %d\n", ret); 2697 goto unregister_bridge; 2698 } 2699 } 2700 2701 if (platform->pdata.audio_en) 2702 anx7625_register_audio(dev, platform); 2703 2704 DRM_DEV_DEBUG_DRIVER(dev, "probe done\n"); 2705 2706 return 0; 2707 2708 unregister_bridge: 2709 drm_bridge_remove(&platform->bridge); 2710 2711 if (!platform->pdata.low_power_mode) 2712 pm_runtime_put_sync_suspend(&client->dev); 2713 2714 anx7625_unregister_i2c_dummy_clients(platform); 2715 2716 free_wq: 2717 if (platform->workqueue) 2718 destroy_workqueue(platform->workqueue); 2719 2720 free_hdcp_wq: 2721 if (platform->hdcp_workqueue) 2722 destroy_workqueue(platform->hdcp_workqueue); 2723 2724 return ret; 2725 } 2726 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org