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[Why & How] When driver allows idle optimization, no HW state should be modified further by DC. Refactor the skip PG logic in pg_cntl in DCN42. Reviewed-by: Ovidiu (Ovi) Bunea <ovidiu.bunea@amd.com> Signed-off-by: Leo Chen <leo.chen@amd.com> Signed-off-by: George Zhang <george.zhang@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>