[Bug 88910] [BYT] igt/pm_rpm/debugfs-read cause dmesg warn

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88910

--- Comment #3 from Ding Heng <hengx.ding at intel.com> ---
(In reply to Chris Wilson from comment #2)
> Close, but the bisect is wrong... Can you look at why the bisect went wrong,
> reproduction here should have been 100%?


I use this kernel commit run the same case 10 times, everytime I can get the
following error in dmesg:
root at x-byt06:~# dmesg -r | egrep "<[1-4]>" |grep drm
<3>[  222.289443] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register
access while GT waking disabled
<3>[  267.371300] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register
access while GT waking disabled
<3>[  317.469940] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register
access while GT waking disabled
root at x-byt06:~# dmesg -r | egrep "<[1-4]>" |grep drm
<3>[  317.469940] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register
access while GT waking disabled
<3>[  370.552391] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register
access while GT waking disabled
root at x-byt06:~# dmesg |grep vlv_check_no_gt_access
[  317.469940] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register access
while GT waking disabled
[  370.552391] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register access
while GT waking disabled
[  402.651940] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register access
while GT waking disabled

I noticed that the error message will disappear about every 1 minute.

On the other hand, I use git log --first-parent
f654449a28e9cce283d6e3ef22c31fe7d865dff5 and find out its parent commit:
737b1506037788f1e01b2a4c5795d4180b2e2e00.

I didn't see this issue on this commit.

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