_PIPEAGCMAX
#define PIPEGCMAX(dev_priv, pipe, i) _MMIO_PIPE2(dev_priv, pipe, _PIPEAGCMAX + (i) * 4) /* u1.16 */
#define PREC_PIPEGCMAX(pipe, i) _MMIO(_PIPE(pipe, _PIPEAGCMAX, _PIPEBGCMAX) + (i) * 4) /* u1.16 */