MAX_I2C_FIFO_THRESHOLD
fill_tx_fifo(priv, MAX_I2C_FIFO_THRESHOLD);
fill_tx_fifo(priv, (MAX_I2C_FIFO_THRESHOLD - tft));
for (count = MAX_I2C_FIFO_THRESHOLD; count > 0; count--) {
priv->cli.count -= MAX_I2C_FIFO_THRESHOLD;
priv->cli.xfer_bytes += MAX_I2C_FIFO_THRESHOLD;