ATOM_PPLL_SS_AMOUNT_V2_FBDIV_MASK
amdgpu_crtc->ss.amount = (amount / 10) & ATOM_PPLL_SS_AMOUNT_V2_FBDIV_MASK;
ATOM_PPLL_SS_AMOUNT_V2_FBDIV_MASK) |
radeon_crtc->ss.amount = (amount / 10) & ATOM_PPLL_SS_AMOUNT_V2_FBDIV_MASK;