ucVoltageStep    4998 drivers/gpu/drm/amd/include/atombios.h    UCHAR    ucVoltageStep;                  //Indicating in how many mv increament is one step, 0.5mv unit
ucVoltageStep    4459 drivers/gpu/drm/radeon/atombios.h    UCHAR    ucVoltageStep;                  //Indicating in how many mv increament is one step, 0.5mv unit