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[Why] We can hang in IPS2 checking DMCUB_SCRATCH0 for link detection state. [How] Replace the HW access with a check on the shared state bit. This will work the same way as the SCRATCH0 but won't require a wake in the case where link detection isn't required. Reviewed-by: Duncan Ma <duncan.ma@amd.com> Acked-by: Wayne Lin <wayne.lin@amd.com> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>