SYNQUACER_HSSPI_FIFO_DEPTH
(SYNQUACER_HSSPI_FIFO_DEPTH - SYNQUACER_HSSPI_FIFO_TX_THRESHOLD)
len = min(SYNQUACER_HSSPI_FIFO_DEPTH - len,
val |= ((sspi->rx_words > SYNQUACER_HSSPI_FIFO_DEPTH ?
u32 buf[SYNQUACER_HSSPI_FIFO_DEPTH];
sspi->rx_words = SYNQUACER_HSSPI_FIFO_DEPTH;