[Bug 92926] [SKL] System hang when screens go into standby

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92926

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imre.deak at intel.com,
                   |                            |maarten.lankhorst at canonical
                   |                            |.com

--- Comment #13 from Imre Deak <imre.deak at intel.com> ---
Ok, this one is a separate issue from what the dmc-fixes branch solves. Here we
are trying to access (In reply to Norbert Varzariu from comment #12)
> Created attachment 119707 [details]
> dmesg dmc-fixes branch

I see three issues in the log:
1. HPD IRQ storm during booting on both HDMI pins:
"hotplug event received, stat 0x00200000, dig 0x10101012, pins 0x00000020"
"hotplug event received, stat 0x00400000, dig 0x10101210, pins 0x00000040"

AFAICS you have two HDMI monitors attached, could you confirm? Also could you
still try if it this storm happens on this kernel branch consistently during
boot and whether booting with disable_power_well=0 makes a difference?

2.
"""
WARNING: CPU: 0 PID: 109 at drivers/gpu/drm/i915/intel_pm.c:3538
skl_update_other_pipe_wm+0x1a7/0x1b0 [i915]()
WARN_ON(!wm_changed)
"""

Looks like some atomic state tracking issue, I think Maarten has a patch for
this. CC'ing him.

3.
"""
WARNING: CPU: 3 PID: 1556 at drivers/gpu/drm/i915/intel_uncore.c:606
hsw_unclaimed_reg_debug+0x69/0x90 [i915]()
Nov 16 15:40:41 desktop.basis kernel: Unclaimed register detected after writing
to register 0x71240
"""
We are accessing 0x71240 while PW2 is off, which is bogus. Again Maarten may
have an idea here.

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