SNPS_PHY_MPLLB_SSCSTEP
intel_de_write(display, SNPS_PHY_MPLLB_SSCSTEP(phy), pll_state->mpllb_sscstep);
pll_state->mpllb_sscstep = intel_de_read(display, SNPS_PHY_MPLLB_SSCSTEP(phy));