knc: Issue flush command at init

driver-knc.c

@@ -186,6 +186,19 @@ bool knc_spi_txrx(struct spi_port * const spi)
 	return (ioctl(fd, SPI_IOC_MESSAGE(1), &xf) > 0);
 }
 
+static
+void knc_clean_flush(struct spi_port * const spi)
+{
+	const uint8_t flushcmd = KNC_REQ_FLUSH_QUEUE << 4;
+	const size_t spi_req_sz = 0x1000;
+	
+	spi_clear_buf(spi);
+	spi_emit_buf(spi, &flushcmd, 1);
+	spi_emit_nop(spi, spi_req_sz - spi_getbufsz(spi));
+	applog(LOG_DEBUG, "%s: Issuing flush command to clear out device queues", knc_drv.dname);
+	spi_txrx(spi);
+}
+
 static
 bool knc_init(struct thr_info * const thr)
 {
@@ -269,6 +282,8 @@ nomorecores: ;
 	if (!knc_spi_open(cgpu->dev_repr, spi))
 		return false;
 	
+	knc_clean_flush(spi);
+	
 	timer_set_now(&thr->tv_poll);
 	
 	return true;