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[Why] For some pixel clock margin sensitive external monitor, we could not keep original DP ref clock for the ASICs supported SSC DP ref clock. [How] From slicon design team's comment, we have to apply the adjusted DP ref clock for DP devices. DP 128b (DP2) signals uses the DTBCLK not DP ref. Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Signed-off-by: Yiling Chen <yi-ling.chen2@amd.com> Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com> Tested-by: Mark Broadworth <mark.broadworth@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>