drm/i915/icl: Enable DDI Buffer
This patch enables DDI buffer by writing to DDI_BUF_CTL register and wait for DDI status to be *not idle* for a port. v2: Rebase v3: Remove step hard coding comments (Jani N) Signed-off-by:Madhav Chauhan <madhav.chauhan@intel.com> Reviewed-by:
Jani Nikula <jani.nikula@intel.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1537095223-5184-4-git-send-email-madhav.chauhan@intel.com
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