mmBIF_INTR_CNTL
bif_intr_cntl = RREG32_SOC15(NBIO, 0, mmBIF_INTR_CNTL);
WREG32_SOC15(NBIO, 0, mmBIF_INTR_CNTL, bif_intr_cntl);
bif_intr_cntl = RREG32_SOC15(NBIO, 0, mmBIF_INTR_CNTL);
WREG32_SOC15(NBIO, 0, mmBIF_INTR_CNTL, bif_intr_cntl);