[Bug 89055] [SKL ] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89055

--- Comment #41 from cprigent <christophe.prigent at intel.com> ---
Created attachment 122960
  --> https://bugs.freedesktop.org/attachment.cgi?id=122960&action=edit
APL-kms_pipe_crc_pipe-c.log

Reproduced on APL when executing igt at kms_pipe_crc_basic@suspend-read-crc-pipe-c

[   72.109585] WARNING: CPU: 0 PID: 1639 at
/home/shared/kernels/drm-intel-nightly/drivers/gpu/drm/i915/intel_pm.c:3647
skl_update_other_pipe_wm+0x172/0x180 [i915]
[   72.109586] WARN_ON(!wm_changed)

Hardware
Platform: Broxton P A0 Platform
CPU Name : Intel(R) @ 1.2 GHz (family: 6, model: 92, stepping: 8) 4 cores
SoC : BROXTON-P A0
CRB : Apollo Lake LPDDR3 RVP1A
Software
Ubuntu 15.10 64 bits
BIOS (IFWI Version): 131.10
KSC: 1.12
Kernel drm-intel-nightly 4.6.0-rc3 dc5380b from
http://cgit.freedesktop.org/drm-intel/
  commit dc5380b5263ebb0bf251bb09db542585702b528b
  Author: Chris Wilson <chris at chris-wilson.co.uk>
  Date:   Mon Apr 11 20:43:45 2016 +0100
  drm-intel-nightly: 2016y-04m-11d-19h-43m-10s UTC integration manifest
libdrm-2.4.67-11 ea78c17 from git://anongit.freedesktop.org/mesa/drm
cairo 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
DMC 1.06 from https://01.org/linuxgraphics/downloads/broxton-dmc-1.06
intel-gpu-tools-1.14 c89e8db from
http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

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