[Bug 89100] [SKL]kms_universal_plane causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89100

--- Comment #4 from wendy.wang at intel.com ---
Re-test with latest drm-intel-nightly branch kernel:
Linux x-skly03 4.0.0-rc2_drm-intel-nightly_c2f6e5_20150307+ #238 SMP Sat Mar 7
09:01:15 EST 2015 x86_64 x86_64 x86_64 GNU/Linux

IGT case kms_universal_plane will not cause system hang, but has call trace.
(dmesg log file attached.)


[   82.281340] Call Trace:
[   82.284867]  [<ffffffff8133ebf9>] ? vsnprintf+0x83/0x3b9
[   82.288441]  [<ffffffffa0080ceb>] ? skl_update_wm+0xfa/0x5cc [i915]
[   82.291981]  [<ffffffff8106f2f9>] ? print_time.part.10+0x50/0x54
[   82.295541]  [<ffffffff8106f89e>] ? print_prefix+0x81/0x89
[   82.299152]  [<ffffffffa00ca9bd>] ? intel_begin_crtc_commit+0x12e/0x165
[i915]
[   82.302749]  [<ffffffffa00527bf>] ? drm_plane_helper_commit+0xd6/0x224
[drm_kms_helper]
[   82.306370]  [<ffffffff810e4f8c>] ? kmemdup+0x18/0x2c
[   82.310003]  [<ffffffffa000f3db>] ? __setplane_internal+0x45/0x2b1 [drm]
[   82.313643]  [<ffffffffa00182f0>] ? drm_modeset_lock_all_crtcs+0x69/0x81
[drm]
[   82.317309]  [<ffffffffa000fa8c>] ? drm_mode_setplane+0x17f/0x1dc [drm]
[   82.321000]  [<ffffffffa00047d4>] ? drm_ioctl+0x344/0x3b3 [drm]
[   82.324688]  [<ffffffffa0006054>] ? drm_wait_one_vblank+0x14c/0x16d [drm]
[   82.328411]  [<ffffffffa000f90d>] ? drm_mode_cursor_common+0x140/0x140 [drm]
[   82.332112]  [<ffffffff8111fa82>] ? do_vfs_ioctl+0x360/0x424
[   82.335783]  [<ffffffff81112f13>] ? __sb_end_write+0x24/0x52
[   82.339430]  [<ffffffff81111331>] ? vfs_write+0x168/0x186
[   82.343109]  [<ffffffff8111fb8f>] ? SyS_ioctl+0x49/0x7a
[   82.346779]  [<ffffffff81798e92>] ? system_call_fastpath+0x12/0x17
[   82.350472] Code: 80 b0 00 00 00 89 45 04 48 8b 83 78 07 00 00 8b 80 98 00
00 00 c6 45 19 01 89 45                                                 08 48
8b 43 70 48 8b 80 38 02 00 00 48 8b 40 10 <8b> 80 84 00 00 00 99 f7 f9 88 45 18
48 8b 83 78 07 0                                                0 00 8b 80
[   82.354511] RIP  [<ffffffffa00804c5>] skl_update_pipe_wm+0x7c/0x507 [i915]
[   82.358393]  RSP <ffff880143bdf998>
[   82.362288] CR2: 0000000000000084

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