EDGE_PER_REV
tmp |= EDGE_PER_REV(adev->pm.fan_pulses_per_revolution -1);
CG_TACH_CTRL, EDGE_PER_REV,
CG_TACH_CTRL, EDGE_PER_REV,
tmp |= EDGE_PER_REV(rdev->pm.fan_pulses_per_revolution -1);
tmp |= EDGE_PER_REV(rdev->pm.fan_pulses_per_revolution -1);