drm/i915: Mask out the HPD irq bits before setting them individually.
To disable previously enabled HPD IRQs we need to reset them and set the enabled ones individually. Signed-off-by:Egbert Eich <eich@suse.de> Reviewed-by:
Jani Nikula <jani.nikula@intel.com> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch>
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