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

[bugzilla-daemon at freedesktop.org]

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

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 05adaf1f101f25f40f12c29403e6488f0e45f6b6
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Fri May 9 14:52:34 2014 +0300

    drm/i915/vlv: reset VLV media force wake request register

    Media force wake get hangs the machine when the system is booted without
    displays attached. The assumption is that (at least some versions of)
    the firmware has skipped some initialization in that case.

    Empirical evidence suggests we need to reset the media force wake
    request register in addition to the render one to avoid hangs.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75895
    Reported-by: Imre Deak <imre.deak at intel.com>
    Reported-by: Darren Hart <dvhart at linux.intel.com>
    Tested-by: Darren Hart <dvhart at linux.intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Cc: stable at vger.kernel.org
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

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