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[Description] - When disabling a phantom pipe, we first enable the phantom OTG so the double buffer update can successfully take place - However, want to avoid locking the phantom otherwise setting DPG_EN=1 for the phantom pipe is blocked (without this we could hit underflow due to phantom HUBP being blanked by default) Reviewed-by: Samson Tam <samson.tam@amd.com> Acked-by: Stylon Wang <stylon.wang@amd.com> Signed-off-by: Alvin Lee <alvin.lee2@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>