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Add a function to get the old MST topology state, required by a follow-up i915 patch. While at it clarify the code comment of drm_atomic_get_new_mst_topology_state() and add _new prefix to the new state pointer to remind about its difference from the old state. v2: Use old_/new_ prefixes for the state pointers. (Ville) Cc: Lyude Paul <[email protected]> Cc: Ville Syrjälä <[email protected]> Cc: [email protected] # 6.1 Cc: [email protected] Reviewed-by: Ville Syrjälä <[email protected]> Reviewed-by: Lyude Paul <[email protected]> Acked-by: Lyude Paul <[email protected]> Acked-by: Daniel Vetter <[email protected]> Acked-by: Wayne Lin <[email protected]> Acked-by: Jani Nikula <[email protected]> Signed-off-by: Imre Deak <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]