diff --git a/drivers/media/pci/intel/ipu6/ipu6-buttress.c b/drivers/media/pci/intel/ipu6/ipu6-buttress.c
index e47f84c30e10..e54e72974ddf 100644
--- a/drivers/media/pci/intel/ipu6/ipu6-buttress.c
+++ b/drivers/media/pci/intel/ipu6/ipu6-buttress.c
@@ -214,20 +214,17 @@ static void ipu6_buttress_ipc_recv(struct ipu6_device *isp,
 }
 
 static int ipu6_buttress_ipc_send_bulk(struct ipu6_device *isp,
-				       enum ipu6_buttress_ipc_domain ipc_domain,
 				       struct ipu6_ipc_buttress_bulk_msg *msgs,
 				       u32 size)
 {
 	unsigned long tx_timeout_jiffies, rx_timeout_jiffies;
 	unsigned int i, retry = BUTTRESS_IPC_CMD_SEND_RETRY;
 	struct ipu6_buttress *b = &isp->buttress;
-	struct ipu6_buttress_ipc *ipc;
+	struct ipu6_buttress_ipc *ipc = &b->cse;
 	u32 val;
 	int ret;
 	int tout;
 
-	ipc = ipc_domain == IPU6_BUTTRESS_IPC_CSE ? &b->cse : &b->ish;
-
 	mutex_lock(&b->ipc_mutex);
 
 	ret = ipu6_buttress_ipc_validity_open(isp, ipc);
@@ -305,7 +302,6 @@ static int ipu6_buttress_ipc_send_bulk(struct ipu6_device *isp,
 
 static int
 ipu6_buttress_ipc_send(struct ipu6_device *isp,
-		       enum ipu6_buttress_ipc_domain ipc_domain,
 		       u32 ipc_msg, u32 size, bool require_resp,
 		       u32 expected_resp)
 {
@@ -316,7 +312,7 @@ ipu6_buttress_ipc_send(struct ipu6_device *isp,
 		.expected_resp = expected_resp,
 	};
 
-	return ipu6_buttress_ipc_send_bulk(isp, ipc_domain, &msg, 1);
+	return ipu6_buttress_ipc_send_bulk(isp, &msg, 1);
 }
 
 static irqreturn_t ipu6_buttress_call_isr(struct ipu6_bus_device *adev)
@@ -381,25 +377,12 @@ irqreturn_t ipu6_buttress_isr(int irq, void *isp_ptr)
 			complete(&b->cse.recv_complete);
 		}
 
-		if (irq_status & BUTTRESS_ISR_IPC_FROM_ISH_IS_WAITING) {
-			dev_dbg(&isp->pdev->dev,
-				"BUTTRESS_ISR_IPC_FROM_ISH_IS_WAITING\n");
-			ipu6_buttress_ipc_recv(isp, &b->ish, &b->ish.recv_data);
-			complete(&b->ish.recv_complete);
-		}
-
 		if (irq_status & BUTTRESS_ISR_IPC_EXEC_DONE_BY_CSE) {
 			dev_dbg(&isp->pdev->dev,
 				"BUTTRESS_ISR_IPC_EXEC_DONE_BY_CSE\n");
 			complete(&b->cse.send_complete);
 		}
 
-		if (irq_status & BUTTRESS_ISR_IPC_EXEC_DONE_BY_ISH) {
-			dev_dbg(&isp->pdev->dev,
-				"BUTTRESS_ISR_IPC_EXEC_DONE_BY_CSE\n");
-			complete(&b->ish.send_complete);
-		}
-
 		if (irq_status & BUTTRESS_ISR_SAI_VIOLATION &&
 		    ipu6_buttress_get_secure_mode(isp))
 			dev_err(&isp->pdev->dev,
@@ -650,7 +633,7 @@ int ipu6_buttress_authenticate(struct ipu6_device *isp)
 	 */
 	dev_info(&isp->pdev->dev, "Sending BOOT_LOAD to CSE\n");
 
-	ret = ipu6_buttress_ipc_send(isp, IPU6_BUTTRESS_IPC_CSE,
+	ret = ipu6_buttress_ipc_send(isp,
 				     BUTTRESS_IU2CSEDATA0_IPC_BOOT_LOAD,
 				     1, true,
 				     BUTTRESS_CSE2IUDATA0_IPC_BOOT_LOAD_DONE);
@@ -692,7 +675,7 @@ int ipu6_buttress_authenticate(struct ipu6_device *isp)
 	 * IU2CSEDB.IU2CSECMD and set IU2CSEDB.IU2CSEBUSY as
 	 */
 	dev_info(&isp->pdev->dev, "Sending AUTHENTICATE_RUN to CSE\n");
-	ret = ipu6_buttress_ipc_send(isp, IPU6_BUTTRESS_IPC_CSE,
+	ret = ipu6_buttress_ipc_send(isp,
 				     BUTTRESS_IU2CSEDATA0_IPC_AUTH_RUN,
 				     1, true,
 				     BUTTRESS_CSE2IUDATA0_IPC_AUTH_RUN_DONE);
@@ -833,9 +816,7 @@ int ipu6_buttress_init(struct ipu6_device *isp)
 	mutex_init(&b->auth_mutex);
 	mutex_init(&b->cons_mutex);
 	mutex_init(&b->ipc_mutex);
-	init_completion(&b->ish.send_complete);
 	init_completion(&b->cse.send_complete);
-	init_completion(&b->ish.recv_complete);
 	init_completion(&b->cse.recv_complete);
 
 	b->cse.nack = BUTTRESS_CSE2IUDATA0_IPC_NACK;
@@ -847,8 +828,6 @@ int ipu6_buttress_init(struct ipu6_device *isp)
 	b->cse.data0_in = BUTTRESS_REG_CSE2IUDATA0;
 	b->cse.data0_out = BUTTRESS_REG_IU2CSEDATA0;
 
-	/* no ISH on IPU6 */
-	memset(&b->ish, 0, sizeof(b->ish));
 	INIT_LIST_HEAD(&b->constraints);
 
 	isp->secure_mode = ipu6_buttress_get_secure_mode(isp);
diff --git a/drivers/media/pci/intel/ipu6/ipu6-buttress.h b/drivers/media/pci/intel/ipu6/ipu6-buttress.h
index 9b6f56958be7..482978c2a09d 100644
--- a/drivers/media/pci/intel/ipu6/ipu6-buttress.h
+++ b/drivers/media/pci/intel/ipu6/ipu6-buttress.h
@@ -46,18 +46,12 @@ struct ipu6_buttress_ipc {
 struct ipu6_buttress {
 	struct mutex power_mutex, auth_mutex, cons_mutex, ipc_mutex;
 	struct ipu6_buttress_ipc cse;
-	struct ipu6_buttress_ipc ish;
 	struct list_head constraints;
 	u32 wdt_cached_value;
 	bool force_suspend;
 	u32 ref_clk;
 };
 
-enum ipu6_buttress_ipc_domain {
-	IPU6_BUTTRESS_IPC_CSE,
-	IPU6_BUTTRESS_IPC_ISH,
-};
-
 struct ipu6_ipc_buttress_bulk_msg {
 	u32 cmd;
 	u32 expected_resp;
diff --git a/drivers/media/pci/intel/ipu6/ipu6-platform-buttress-regs.h b/drivers/media/pci/intel/ipu6/ipu6-platform-buttress-regs.h
index 20f27011df43..efd65e494c16 100644
--- a/drivers/media/pci/intel/ipu6/ipu6-platform-buttress-regs.h
+++ b/drivers/media/pci/intel/ipu6/ipu6-platform-buttress-regs.h
@@ -219,8 +219,6 @@ enum {
 				 BUTTRESS_ISR_IS_IRQ | BUTTRESS_ISR_PS_IRQ)
 
 #define BUTTRESS_EVENT		 (BUTTRESS_ISR_IPC_FROM_CSE_IS_WAITING | \
-				  BUTTRESS_ISR_IPC_FROM_ISH_IS_WAITING | \
 				  BUTTRESS_ISR_IPC_EXEC_DONE_BY_CSE |    \
-				  BUTTRESS_ISR_IPC_EXEC_DONE_BY_ISH |    \
 				  BUTTRESS_ISR_SAI_VIOLATION)
 #endif /* IPU6_PLATFORM_BUTTRESS_REGS_H */
