UNCORE_EFF_LAT_CTRL_RATIO_MASK
*val = FIELD_GET(UNCORE_EFF_LAT_CTRL_RATIO_MASK, ctrl) * UNCORE_FREQ_KHZ_MULTIPLIER;
if (val > FIELD_MAX(UNCORE_EFF_LAT_CTRL_RATIO_MASK))
control &= ~UNCORE_EFF_LAT_CTRL_RATIO_MASK;
control |= FIELD_PREP(UNCORE_EFF_LAT_CTRL_RATIO_MASK, val);