drm/i915: Fix up vlv/chv display irq setup
The vlv/chv display irq setup was a bit of mess after I ran out of steam when working on it last. Fix it up so that we just have a _reset() and _postinstall() hooks for the display irqs, and use those consistently. v2: Clear out pipestat_irq_mask[] and PIPE_FIFO_UNDERRUN_STATUS in vlv_display_irq_reset() (Imre) Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> (v1) Link: http://patchwork.freedesktop.org/patch/msgid/1460476574-1921-1-git-send-email-ville.syrjala@linux.intel.com
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