drm/i915: Haswell HDMI audio initialization
Added new haswell_write_eld() to initialize Haswell HDMI audio registers to generate an unsolicited response to the audio controller driver to indicate that the controller sequence should start. Reviewed-by: NImre Deak <imre.deak@intel.com> Signed-off-by: NWang Xingchao <xingchao.wang@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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