[Bug 92181] [SKL] igt/kms_plan/plane-position-covered-pipe-b-plane-2 fail and cause system crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92181

--- Comment #3 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
I'm seeing the below WARN when testing with displayport connected, previously I
would probably get the same hard hang as well.

[   68.099084] ------------[ cut here ]------------
[   68.099101] WARNING: CPU: 0 PID: 1261 at
drivers/gpu/drm/i915/intel_uncore.c:619 hsw_unclaimed_reg_debug+0x66/0x80
[i915]()
[   68.099102] Unclaimed register detected after writing to register 0x71240

[   68.099122] CPU: 0 PID: 1261 Comm: kms_plane Tainted: G     U  W      
4.3.0-rc3-patser+ #4398
[   68.099124] Hardware name: Intel Corporation Skylake Client platform/Skylake
DT DDR4 RVP8, BIOS SKLSE2R1.R00.B084.B02.1505180148 05/18/2015
[   68.099125]  ffffffffc01a8600 ffff880089dbb9c0 ffffffff812d3cfc
ffff880089dbba08
[   68.099127]  ffff880089dbb9f8 ffffffff8107e2ad ffff880455b60000
0000000000071240
[   68.099130]  0000000000071240 ffff880455b60080 0000000000000246
ffff880089dbba58
[   68.099132] Call Trace:
[   68.099136]  [<ffffffff812d3cfc>] dump_stack+0x4e/0x82
[   68.099139]  [<ffffffff8107e2ad>] warn_slowpath_common+0x7d/0xb0
[   68.099141]  [<ffffffff8107e327>] warn_slowpath_fmt+0x47/0x50
[   68.099144]  [<ffffffff810a417d>] ? get_parent_ip+0xd/0x50
[   68.099159]  [<ffffffffc0124eb6>] hsw_unclaimed_reg_debug+0x66/0x80 [i915]
[   68.099172]  [<ffffffffc0129107>] gen9_write32+0x2a7/0x320 [i915]
[   68.099181]  [<ffffffffc00e6803>] skl_update_wm+0x2e3/0x710 [i915]
[   68.099190]  [<ffffffffc00e7bc9>] intel_update_watermarks+0x19/0x20 [i915]
[   68.099205]  [<ffffffffc014841e>] intel_atomic_commit+0x48e/0x13d0 [i915]
[   68.099208]  [<ffffffff813f3f2f>] ? drm_atomic_check_only+0x13f/0x5b0
[   68.099211]  [<ffffffff813f3a88>] ?
drm_atomic_add_affected_connectors+0x88/0xf0
[   68.099214]  [<ffffffff813f43d2>] drm_atomic_commit+0x32/0x50
[   68.099216]  [<ffffffff813d2132>] drm_atomic_helper_set_config+0x72/0xb0
[   68.099219]  [<ffffffff813e440d>] drm_mode_set_config_internal+0x5d/0xf0
[   68.099220]  [<ffffffff813e84f3>] drm_mode_setcrtc+0x183/0x4c0
[   68.099223]  [<ffffffff813da43b>] drm_ioctl+0x12b/0x550
[   68.099225]  [<ffffffff813e8370>] ? drm_mode_setplane+0x1a0/0x1a0
[   68.099228]  [<ffffffff81285ea7>] ? ioctl_has_perm+0xa7/0xc0
[   68.099230]  [<ffffffff811a89fc>] do_vfs_ioctl+0x2fc/0x550
[   68.099232]  [<ffffffff81285f0b>] ? selinux_file_ioctl+0x4b/0xd0
[   68.099235]  [<ffffffff8127b4ae>] ? security_file_ioctl+0x3e/0x60
[   68.099236]  [<ffffffff811a8cc4>] SyS_ioctl+0x74/0x80
[   68.099239]  [<ffffffff817126d7>] entry_SYSCALL_64_fastpath+0x12/0x6a
[   68.099240] ---[ end trace a22947acc427d3eb ]---

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