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[why] In order to support glitchless display clock ramping for virtual stream, we must turn on symclk for stream encoder. The code will power on phy and enable symclk for dio encoder during virtual stream dpms sequence. Reviewed-by: Dillon Varone <dillon.varone@amd.com> Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com> Signed-off-by: Wenjing Liu <wenjing.liu@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>