OUT_PKT4(ring, REG_A5XX_VFD_DECODE(j), 2);
OUT_RING(ring, A5XX_VFD_DECODE_INSTR_IDX(j) |
A5XX_VFD_DECODE_INSTR_FORMAT(fmt) |
+ COND(elem->instance_divisor, A5XX_VFD_DECODE_INSTR_INSTANCED) |
0xc0000000); // XXX
OUT_RING(ring, MAX2(1, elem->instance_divisor)); /* VFD_DECODE[j].STEP_RATE */