Assigning to Mika since he last touched this self-check.

Argh, copypaste fail. The affected testcase is kms_pipe_crc_basic@nonblocking-crc-pipe-b Looking at long-term history in

/archive/results/CI_IGT_test/igt@kms_pipe_crc_basic@nonblocking-crc-pipe-b.html

it seems to be a regression that started with CI_DRM_963

This unclaimed has always been there, it is just that we enabled
the debugs for byt/bsw too, which brought this to surface.

If you look closely there is identical trace with bsw, but with
different testcase: igt@kms_pipe_crc_basic@read-crc-pipe-c-frame-sequence

I have verified that indeed the power wells are all off when
we set the memory_cxsr, from intel_pre_plane_update().

Ville knows about this and according to him this is a real
problem with atomic commit in how/where intel_pre_plane_update() is called.

Patch pushed which removes the warning in byt/bsw if mmio_debug is not set.

Use i915.mmio_debug=10000 to reproduce.

http://url.dsl.pp.ua/875575/pils/page.php

Patch sent.

http://lists.freedesktop.org/archives/intel-gfx/2016-February/086986.html

Assigning to QA for verification

Created attachment 122180 [details]
kern-with-mmio_debug.log

I don't see this warning when executing kms_pipe_crc_basic@nonblocking-crc-pipe-b.
But I also don't see it with kernel boot command line: i915.mmio_debug=10000
Do we need to track it?

Hardware 
Platform : Bay Trail M
CPU : Intel(R) Celeron(R) CPU  N2930  @ 1.83GHz (family: 6, model: 55 stepping: 8)
SoC : VLV C0
CRB : Bayley Bay Fab3 Rev 03
Bios: 100.21
Software
Linux distribution: Ubuntu 15.10 64 bits
Kernel drm-intel-nightly 4.5.0-rc7 from http://cgit.freedesktop.org/drm-intel/
drm: tag 2.4.67-5 ea07de9 from http://cgit.freedesktop.org/mesa/drm/
mesa: tag 11.1.2 7bcd827 from http://cgit.freedesktop.org/mesa/mesa/
cairo: tag 1.15.2 db8a7f1 from http://cgit.freedesktop.org/cairo
IGT: 1.14 174a06 from http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

commit 2dfd178dc05164d6d730f4b3649accc1ee1ee585
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Wed Feb 3 16:53:25 2016 +0100

    drm/i915: Do not disable cxsr when crtc is disabled.

with/ without i915.mmio_debug=10000 the warning message does not appears in dmesg


Hardware information
====================
Platform                         : BYT-M (Toshiba)
Motherboard model                : Satellite C55t-A
Motherboard type                 : Portable PC Notebook
Motherboard manufacturer         : TOSHIBA
CPU family                       : Atom
CPU information                  : Intel(R) Celeron(R) CPU  N2820  @ 2.13GHz
GPU Card                         : Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0c) (prog-if 00 [VGA controller])
Memory ram                       : 4 GB


Software information
=====================
 --> Component : drm 
	 url : http://cgit.freedesktop.org/mesa/drm 
	 tag : libdrm-2.4.67-7-g49041c3 
	 commit : 49041c3 
	 author : Rob Clark <robclark@freedesktop.org> 
	 age : 4 weeks ago 
 --> Component : mesa 
	 url : http://cgit.freedesktop.org/mesa/mesa 
	 tag : mesa-11.1.2 
	 commit : 7bcd827 
	 author : Emil Velikov <emil.velikov@collabora.com> 
	 age : 6 weeks ago 
 --> Component : xf86-video-intel 
	 url : http://cgit.freedesktop.org/xorg/driver/xf86-video-intel 
	 tag : 2.99.917-579-g74cd4d0 
	 commit : 74cd4d0 
	 author : Chris Wilson <chris@chris-wilson.co.uk> 
	 age : 6 days ago 
 --> Component : libva 
	 url : http://cgit.freedesktop.org/libva/ 
	 tag : libva-1.7.0-1-g2339d10 
	 commit : 2339d10 
	 author : Xiang Haihao <haihao.xiang@intel.com> 
	 age : 6 days ago 
 --> Component : vaapi (intel-driver) 
	 url : http://cgit.freedesktop.org/vaapi/intel-driver 
	 tag : 1.7.0-5-g759e44d 
	 commit : 759e44d 
	 author : peng.chen <peng.c.chen@intel.com> 
	 age : 7 days ago 
 --> Component : cairo 
	 url : http://cgit.freedesktop.org/cairo 
	 tag : 1.15.2 
	 commit : db8a7f1 
	 author : Bryce Harrington <bryce@osg.samsung.com> 
	 age : 3 months ago 
 --> Component : xserver 
	 url :  http://cgit.freedesktop.org/xorg/xserver 
	 tag : xorg-server-1.18.0-247-ga288cf5 
	 commit : a288cf5 
	 author : Dave Airlie <airlied@redhat.com> 
	 age : 7 days ago 
 --> Component : intel-gpu-tools 
	 url : http://cgit.freedesktop.org/xorg/app/intel-gpu-tools 
	 tag : intel-gpu-tools-1.14-115-g7fc5256 
	 commit : 7fc5256 
	 author : Lionel Landwerlin <lionel.g.landwerlin@intel.com> 
	 age : 4 days ago 


kernel information
===================
Branch = drm-intel-nightly
commit 4b39223f6e3bef4dfa678f7239dcd87c38e20e96
Author: Matt Roper <matthew.d.roper@intel.com>
Date:   Mon Mar 21 11:44:01 2016 -0700

    drm-intel-nightly: 2016y-03m-21d-18h-43m-18s UTC integration manifest


Attachments
================
dmesg_with_i915.mmio_debug=10000.log
dmesg_without_i915.mmio_debug=10000.log

Created attachment 122499 [details]
dmesg_with_i915.mmio_debug=10000.log

Created attachment 122500 [details]
dmesg_without_i915.mmio_debug=10000.log