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[why] Based on power measurement result, in most cases when display clock is higher than Vmin display clock, lowering display clock using dynamic ODM will improve overall power consumption by 0 to 4 watts even if we can't reach Vmin. [how] Allow vmin optimization applied even if dispclk can't reach Vmin. Reviewed-by: Austin Zheng <austin.zheng@amd.com> Signed-off-by: Wenjing Liu <wenjing.liu@amd.com> Signed-off-by: Tom Chung <chiahsuan.chung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>