drm/i915: Add debug module option for VTd validation
VTd has a few too many "outright disable the damn thing" workarounds accumulated and for validation we want a simple knob to make sure we disable them all. Since this is for bdw+ validation and atm we don't have any workarounds for bdw this option currently does nothing. So currently this is just a placeholder to make sure reality will match with the documented process for our validation people. v2: Fix up param description (Jani). v3: Actually git add ... Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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