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[WHY] The `dc_tiling_info` union previously did not have a field to specify the active GFX format, assuming only one format would be used per DCN version. from DCN4+, support for switching between different GFX formats is introduced, requiring a way to track which format is currently in use. [HOW] Updated the `dc_tiling_info` union to include a new field that explicitly indicates the currently used GFX format. This allows the system to determine the active GFX format and take the correct programming path accordingly. [Description] The union `dc_tiling_info` has been updated to support multiple GFX formats by adding a new field for identifying the active format. This update ensures that the correct programming path is followed based on the selected format. All references to `dc_tiling_info` in the codebase have been updated to reflect the new structure. Reviewed-by: Alvin Lee <alvin.lee2@amd.com> Signed-off-by: Karthi Kandasamy <karthi.kandasamy@amd.com> Signed-off-by: Roman Li <roman.li@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>