drm/amdgpu/gfx8: Add serdes wait for idle in CGCG en/disable
Must wait for SERDES idle before exiting RLC SAFEMODE Signed-off-by: Tom St Denis <tom.stdenis@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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