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[Why] In DML2, the current method to determine a mode is supported involves checking the voltage levels sequentially from the lowest, until one is found that can support the mode. It causes cursor lag due to low performance. [How] We apply two methods for mode validation. 1) DC_VALIDATE_MODE_ONLY: only the maximum voltage level is checked to determine whether the mode is supported, which improves performance and eliminate cursor lag. 2) DC_VALIDATE_MODE_AND_STATE_INDEX: when the optimal voltage level is required, check the voltage level from the lowest until a suitable one is found found and returns its index. Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Reviewed-by: Aric Cyr <aric.cyr@amd.com> Signed-off-by: Yan Li <yan.li@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>