[Bug 75895] New: [BYT] Media forcewake timeout with no displays connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75895

          Priority: medium
            Bug ID: 75895
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT] Media forcewake timeout with no displays
                    connected
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: imre.deak at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 95310
  --> https://bugs.freedesktop.org/attachment.cgi?id=95310&action=edit
dmesg for media forcewake lockup

I get the lockup in the attached dmesg by just booting -nightly without any
display connected on my Bayley Bay B0. Sometimes the 'waiting for the old ack
to clear' just times out and I manage to get to the shell, sometimes one of the
__raw_i915_read32(dev_priv, FORCEWAKE_ACK_MEDIA_VLV); reads in
__vlv_force_wake_get() will hard lock the machine, as in the attached dmesg.

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