drm/i915: enable dp mst audio
This patch adds support for DP MST audio in i915. Enable audio codec when DP MST is enabled if has_audio flag is set. Disable audio codec when DP MST is disabled if has_audio flag is set. Another separated patches to support DP MST audio will be implemented in audio driver. This patch is ported from commit 3708d5e0 ("drm/i915: start adding dp mst audio") And because commit 3708d5e0 ("drm/i915: start adding dp mst audio") breaks MST multi-monitor setups on some platforms, the orignal patch is reverted by commit be754b10 ("Revert "drm/i915: start adding dp mst audio"") As the multi-monitor setups issue is fixed, let's port the patch and enable the dp mst audio. Signed-off-by: NLibin Yang <libin.yang@intel.com> Cc: Lyude <cpaul@redhat.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Reviewed-by: NJani Nikula <jani.nikula@intel.com> Signed-off-by: NJani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1480334827-112273-3-git-send-email-libin.yang@intel.com
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