[Bug 103337] [CI] igt@* - dmesg-warn - *ERROR* Panel is unable to calculate any CRC after 6 vblanks | Unclaimed read from register 0x130090

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103337

--- Comment #8 from Marta Löfstedt <marta.lofstedt at intel.com> ---
Note from:
CI_DRM_3611 and all consecutive runs on GLK-shards, so far to CI_DRM_3617

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3611/shard-glkb3/igt@debugfs_test@read_all_entries.html

hits:
[  139.108554] Unclaimed read from register 0x130090
[  139.108666] WARNING: CPU: 1 PID: 1462 at
drivers/gpu/drm/i915/intel_uncore.c:986 __unclaimed_reg_debug+0x3b/0x50 [i915]
[  139.108671] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic i915 x86_pkg_temp_thermal intel_powerclamp coretemp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_codec
snd_hwdep snd_hda_core snd_pcm r8169 mei_me mii mei prime_numbers i2c_hid
pinctrl_geminilake pinctrl_intel
[  139.108800] CPU: 1 PID: 1462 Comm: debugfs_test Tainted: G     U          
4.15.0-rc7-CI-CI_DRM_3611+ #1
[  139.108806] Hardware name: Intel Corp. Geminilake/GLK RVP1 DDR4 (05), BIOS
GELKRVPA.X64.0062.B30.1708222146 08/22/2017
[  139.108892] RIP: 0010:__unclaimed_reg_debug+0x3b/0x50 [i915]
[  139.108898] RSP: 0018:ffffc9000059bd38 EFLAGS: 00010092
[  139.108908] RAX: 0000000000000025 RBX: 0000000000000000 RCX:
0000000000000002
[  139.108914] RDX: 0000000080000002 RSI: ffffffff820ab3a7 RDI:
00000000ffffffff
[  139.108919] RBP: 0000000000130090 R08: 0000000000000000 R09:
0000000000000001
[  139.108925] R10: ffffc9000059bcd0 R11: 0000000000000002 R12:
0000000000000001
[  139.108930] R13: ffff8801695c0ca0 R14: 0000000000000000 R15:
0000000000000202
[  139.108936] FS:  00007fbb4cd6da40(0000) GS:ffff88017fc80000(0000)
knlGS:0000000000000000
[  139.108942] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  139.108948] CR2: 000055921b94d2d8 CR3: 000000016a208000 CR4:
0000000000340ee0
[  139.108953] Call Trace:
[  139.109046]  fwtable_read32+0x214/0x290 [i915]
[  139.109131]  i915_drpc_info+0x267/0x8c0 [i915]
[  139.109145]  ? rcu_read_lock_sched_held+0x6f/0x80
[  139.109162]  seq_read+0xd8/0x3a0
[  139.109176]  ? debug_check_no_obj_freed+0x11f/0x230
[  139.109190]  full_proxy_read+0x4b/0x70
[  139.109204]  __vfs_read+0x1e/0x120
[  139.109215]  ? do_sys_open+0x197/0x1f0
[  139.109226]  ? do_sys_open+0x197/0x1f0
[  139.109237]  ? entry_SYSCALL_64_fastpath+0x5/0x89
[  139.109248]  vfs_read+0x9e/0x150
[  139.109260]  SyS_read+0x40/0xa0
[  139.109274]  entry_SYSCALL_64_fastpath+0x1c/0x89
[  139.109281] RIP: 0033:0x7fbb4b2456d0
[  139.109286] RSP: 002b:00007ffcd34b3888 EFLAGS: 00000246
[  139.109315] Code: 3c 01 75 30 84 db 75 2c 45 84 e4 48 c7 c0 85 35 26 a0 48
c7 c6 7b 35 26 a0 48 0f 44 f0 89 ea 48 c7 c7 8e 35 26 a0 e8 b5 8c ed e0 <0f> ff
83 2d 4c bc 16 00 01 5b 5d 41 5c c3 0f 1f 80 00 00 00 00 
[  139.109629] ---[ end trace 8ffd6c56c54f09e5 ]---

i915_regs.h
#define  FORCEWAKE_ACK                          _MMIO(0x130090)

I believe the backtrace is from:
i915_debugfs.c -> 
static int gen6_drpc_info(struct seq_file *m)
...
                while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_ACK) & 1))

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