HDSP_LatencyMask
s->control_register &= ~HDSP_LatencyMask;
#define hdsp_encode_latency(x) (((x)<<1) & HDSP_LatencyMask)
#define hdsp_decode_latency(x) (((x) & HDSP_LatencyMask)>>1)
x = 1 << (6 + hdsp_decode_latency(hdsp->control_register & HDSP_LatencyMask));