drm/i915: Kill RMW from ILK reset code
All the other bits in the GDSR register are read-only, so we don't have to preserve them when we perform a GPU reset. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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