FYI, we noticed the below changes on

git://internal_merge_and_test_tree revert-4ab968b65909d41237ee43235a82f8cd71bbc547-4ab968b65909d41237ee43235a82f8cd71bbc547
commit 4ab968b65909d41237ee43235a82f8cd71bbc547 ("drm/i915: Init power domains early in driver load")


[   31.055605] mmcblk0boot1: mmc0:0001 MCG8GC partition 2 4.00 MiB
[   31.055704] mmcblk0rpmb: mmc0:0001 MCG8GC partition 3 4.00 MiB
[   31.092091] ------------[ cut here ]------------
[   31.097332] WARNING: CPU: 1 PID: 302 at drivers/gpu/drm/i915/intel_sideband.c:200 vlv_dpio_read+0x6c/0x80 [i915]()
[   31.110976] DPIO read pipe A reg 0x8170 == 0xffffffff
[   31.119181] Modules linked in: acpi_cpufreq(-) coretemp kvm_intel kvm mmc_block irqbypass crct10dif_pclmul crc32_pclmul i915(+) crc32c_intel snd_hda_intel drm_kms_helper syscopyarea ahci snd_hda_codec aesni_intel snd_hda_core lrw snd_hwdep gf128mul glue_helper snd_pcm ablk_helper snd_timer snd sysfillrect libahci cryptd sysimgblt pcspkr fb_sys_fops libata serio_raw soundcore shpchp sdhci_pci drm i2c_hid dw_dmac video dw_dmac_core i2c_designware_platform sdhci_acpi i2c_designware_core sdhci spi_pxa2xx_platform mmc_core
[   31.119185] CPU: 1 PID: 302 Comm: modprobe Not tainted 4.4.0-rc8-00001-g4ab968b #1
[   31.119186] Hardware name: Intel Corporation CHERRYVIEW C0 PLATFORM/Braswell CRB, BIOS BRAS.X64.B083.R00.1508100433 08/10/2015
[   31.119189]  ffffffffa042a5b8 ffff88027cddf798 ffffffff81411052 ffff88027cddf7e0
[   31.119192]  ffff88027cddf7d0 ffffffff81078cc6 0000000000000000 0000000000008170
[   31.119194]  ffff880069a87d50 0000000000000000 ffffffffa043f9e0 ffff88027cddf830
[   31.119194] Call Trace:
[   31.119204]  [<ffffffff81411052>] dump_stack+0x4b/0x69
[   31.119209]  [<ffffffff81078cc6>] warn_slowpath_common+0x86/0xc0
[   31.119211]  [<ffffffff81078d4c>] warn_slowpath_fmt+0x4c/0x50
[   31.119254]  [<ffffffffa03d296c>] vlv_dpio_read+0x6c/0x80 [i915]
[   31.119280]  [<ffffffffa036417f>] chv_dpio_cmn_power_well_enable+0x12f/0x260 [i915]
[   31.119305]  [<ffffffffa0365779>] intel_display_power_get+0xa9/0x100 [i915]
[   31.119331]  [<ffffffffa0365a4b>] intel_display_set_init_power+0x3b/0x40 [i915]
[   31.119356]  [<ffffffffa0365bde>] intel_power_domains_init_hw+0x11e/0x420 [i915]
[   31.119392]  [<ffffffffa0401ea5>] i915_driver_load+0x495/0xf20 [i915]
[   31.119407]  [<ffffffff817bf62b>] ? netlink_broadcast_filtered+0x13b/0x3c0
[   31.119410]  [<ffffffff81414400>] ? cleanup_uevent_env+0x10/0x10
[   31.119412]  [<ffffffff81414764>] ? kobject_uevent_env+0x164/0x660
[   31.119417]  [<ffffffff81559717>] ? get_device+0x17/0x20
[   31.119427]  [<ffffffff8155f3b5>] ? klist_class_dev_get+0x15/0x20
[   31.119430]  [<ffffffff818b9fb2>] ? klist_add_tail+0x32/0x50
[   31.119432]  [<ffffffff8155b129>] ? device_add+0x229/0x670
[   31.119451]  [<ffffffffa00c71a7>] drm_dev_register+0xa7/0xb0 [drm]
[   31.119462]  [<ffffffffa00c961d>] drm_get_pci_dev+0x8d/0x1e0 [drm]
[   31.119509]  [<ffffffffa0349224>] i915_pci_probe+0x34/0x50 [i915]
[   31.119512]  [<ffffffff81458a55>] local_pci_probe+0x45/0xa0
[   31.119515]  [<ffffffff81459e47>] pci_device_probe+0xd7/0x120
[   31.119518]  [<ffffffff8155e434>] driver_probe_device+0x224/0x4a0
[   31.119520]  [<ffffffff8155e734>] __driver_attach+0x84/0x90
[   31.119522]  [<ffffffff8155e6b0>] ? driver_probe_device+0x4a0/0x4a0
[   31.119524]  [<ffffffff8155c154>] bus_for_each_dev+0x64/0xa0
[   31.119525]  [<ffffffff8155ddce>] driver_attach+0x1e/0x20
[   31.119527]  [<ffffffff8155d931>] bus_add_driver+0x1f1/0x290
[   31.119530]  [<ffffffff8155f0d0>] driver_register+0x60/0xe0
[   31.119537]  [<ffffffff8145835c>] __pci_register_driver+0x4c/0x50
[   31.119548]  [<ffffffffa00c9850>] drm_pci_init+0xe0/0x110 [drm]
[   31.119550]  [<ffffffffa02ac000>] ? 0xffffffffa02ac000
[   31.119572]  [<ffffffffa02ac094>] i915_init+0x94/0x9b [i915]
[   31.119576]  [<ffffffff81002123>] do_one_initcall+0xb3/0x1d0
[   31.119579]  [<ffffffff8116b873>] ? do_init_module+0x27/0x1e8
[   31.119582]  [<ffffffff811c99e5>] ? kmem_cache_alloc_trace+0x195/0x200
[   31.119584]  [<ffffffff811cb05b>] ? kfree+0x12b/0x140
[   31.119586]  [<ffffffff8116b8ac>] do_init_module+0x60/0x1e8
[   31.119589]  [<ffffffff810ff199>] load_module+0x2089/0x24b0
[   31.119591]  [<ffffffff810fb310>] ? __symbol_put+0x40/0x40
[   31.119594]  [<ffffffff810ff7c0>] SyS_finit_module+0x80/0xb0
[   31.119598]  [<ffffffff818c752e>] entry_SYSCALL_64_fastpath+0x12/0x71
[   31.119600] ---[ end trace 606510f1af7ad886 ]---
[   31.122429] systemd-journald[119]: Compressed data object 519 -> 404


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Ying Huang