tree e3e8d6587477c74107f1ecbdab5850c59505df62
parent e4c610fe051579ba0a1fadf339905b0231c6ef94
author Jani Nikula <jani.nikula@intel.com> 1399636354 +0300
committer Jani Nikula <jani.nikula@intel.com> 1399661246 +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@intel.com>
Reported-by: Darren Hart <dvhart@linux.intel.com>
Tested-by: Darren Hart <dvhart@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>