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[WHY] SCR for DP 2.0 spec says that multiple LTTPRs must not be accessed in a single AUX transaction. There may be other places in future where breaking up AUX accesses is necessary. [HOW] Partition the entire DPCD address space into blocks. When an incoming AUX request spans multiple blocks, break up the request into multiple requests. Signed-off-by: Wesley Chalmers <[email protected]> Reviewed-by: Jun Lei <[email protected]> Acked-by: Anson Jacob <[email protected]> Tested-by: Daniel Wheeler <[email protected]> Signed-off-by: Alex Deucher <[email protected]>