diff --git a/src/drivers/intel/cavs/sue-ipc.c b/src/drivers/intel/cavs/sue-ipc.c
index 28b00b1ba..ae9b8b61a 100644
--- a/src/drivers/intel/cavs/sue-ipc.c
+++ b/src/drivers/intel/cavs/sue-ipc.c
@@ -42,6 +42,7 @@
 #include <sof/alloc.h>
 #include <sof/wait.h>
 #include <sof/trace.h>
+#include <sof/spi.h>
 #include <sof/ssp.h>
 #include <platform/interrupt.h>
 #include <platform/mailbox.h>
@@ -54,11 +55,6 @@
 
 extern struct ipc *_ipc;
 
-/* test code to check working IRQ */
-static void irq_handler(void *arg)
-{
-}
-
 void ipc_platform_do_cmd(struct ipc *ipc)
 {
 	struct ipc_data *iipc = ipc_get_drvdata(ipc);
@@ -68,6 +64,7 @@ void ipc_platform_do_cmd(struct ipc *ipc)
 	/* perform command and return any error */
 	err = ipc_cmd();
 	if (err > 0) {
+		mailbox_hostbox_read(&reply, 0, sizeof(reply));
 		goto done; /* reply created and copied by cmd() */
 	} else if (err < 0) {
 		/* send std error reply */
@@ -80,9 +77,10 @@ void ipc_platform_do_cmd(struct ipc *ipc)
 	/* send std error/ok reply */
 	reply.hdr.cmd = SOF_IPC_GLB_REPLY;
 	reply.hdr.size = sizeof(reply);
-	mailbox_hostbox_write(0, &reply, sizeof(reply));
 
 done:
+	spi_push(spi_get(SOF_SPI_INTEL_SLAVE), &reply, sizeof(reply));
+
 	ipc->host_pending = 0;
 
 	// TODO: signal audio work to enter D3 in normal context
@@ -140,12 +138,5 @@ int platform_ipc_init(struct ipc *ipc)
 	/* PM */
 	iipc->pm_prepare_D3 = 0;
 
-	/* configure interrupt */
-	interrupt_register(PLATFORM_IPC_INTERRUPT, IRQ_AUTO_UNMASK,
-			   irq_handler, NULL);
-	interrupt_enable(PLATFORM_IPC_INTERRUPT);
-
-	/* enable IPC interrupts from host */
-
 	return 0;
 }