drm: get cea video id code for a given display mode
This patch adds support for getting CEA Video ID Code for a given display mode after matching with edid_cea_modes list. Its index in the list added with one, gives the desired code. This exported function will be used by hdmi drivers for composing AVI info frame data. Signed-off-by: NStephane Marchesin <marcheu@chromium.org> Signed-off-by: NRahul Sharma <rahul.sharma@samsung.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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