diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 57764e9cd19d..d3cf1d9d67d4 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -480,7 +480,7 @@ static struct pci_doe_mb *find_cdat_doe(struct device *uport)
 	return NULL;
 }
 
-#define CDAT_DOE_REQ(entry_handle)					\
+#define CDAT_DOE_REQ(entry_handle) cpu_to_le32				\
 	(FIELD_PREP(CXL_DOE_TABLE_ACCESS_REQ_CODE,			\
 		    CXL_DOE_TABLE_ACCESS_REQ_CODE_READ) |		\
 	 FIELD_PREP(CXL_DOE_TABLE_ACCESS_TABLE_TYPE,			\
@@ -493,8 +493,8 @@ static void cxl_doe_task_complete(struct pci_doe_task *task)
 }
 
 struct cdat_doe_task {
-	u32 request_pl;
-	u32 response_pl[32];
+	__le32 request_pl;
+	__le32 response_pl[32];
 	struct completion c;
 	struct pci_doe_task task;
 };
@@ -531,7 +531,7 @@ static int cxl_cdat_get_length(struct device *dev,
 	if (t.task.rv < sizeof(u32))
 		return -EIO;
 
-	*length = t.response_pl[1];
+	*length = le32_to_cpu(t.response_pl[1]);
 	dev_dbg(dev, "CDAT length %zu\n", *length);
 
 	return 0;
@@ -548,7 +548,7 @@ static int cxl_cdat_read_table(struct device *dev,
 	do {
 		DECLARE_CDAT_DOE_TASK(CDAT_DOE_REQ(entry_handle), t);
 		size_t entry_dw;
-		u32 *entry;
+		__le32 *entry;
 		int rc;
 
 		rc = pci_doe_submit_task(cdat_doe, &t.task);
@@ -563,7 +563,7 @@ static int cxl_cdat_read_table(struct device *dev,
 
 		/* Get the CXL table access header entry handle */
 		entry_handle = FIELD_GET(CXL_DOE_TABLE_ACCESS_ENTRY_HANDLE,
-					 t.response_pl[0]);
+					 le32_to_cpu(t.response_pl[0]));
 		entry = t.response_pl + 1;
 		entry_dw = t.task.rv / sizeof(u32);
 		/* Skip Header */
diff --git a/drivers/pci/doe.c b/drivers/pci/doe.c
index 66d9ab288646..69efa9a250b9 100644
--- a/drivers/pci/doe.c
+++ b/drivers/pci/doe.c
@@ -143,7 +143,7 @@ static int pci_doe_send_req(struct pci_doe_mb *doe_mb,
 					  length));
 	for (i = 0; i < task->request_pl_sz / sizeof(u32); i++)
 		pci_write_config_dword(pdev, offset + PCI_DOE_WRITE,
-				       task->request_pl[i]);
+				       le32_to_cpu(task->request_pl[i]));
 
 	pci_doe_write_ctrl(doe_mb, PCI_DOE_CTRL_GO);
 
@@ -198,8 +198,8 @@ static int pci_doe_recv_resp(struct pci_doe_mb *doe_mb, struct pci_doe_task *tas
 	payload_length = min(length, task->response_pl_sz / sizeof(u32));
 	/* Read the rest of the response payload */
 	for (i = 0; i < payload_length; i++) {
-		pci_read_config_dword(pdev, offset + PCI_DOE_READ,
-				      &task->response_pl[i]);
+		pci_read_config_dword(pdev, offset + PCI_DOE_READ, &val);
+		task->response_pl[i] = cpu_to_le32(val);
 		/* Prior to the last ack, ensure Data Object Ready */
 		if (i == (payload_length - 1) && !pci_doe_data_obj_ready(doe_mb))
 			return -EIO;
@@ -322,15 +322,17 @@ static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
 	struct pci_doe_task task = {
 		.prot.vid = PCI_VENDOR_ID_PCI_SIG,
 		.prot.type = PCI_DOE_PROTOCOL_DISCOVERY,
-		.request_pl = &request_pl,
+		.request_pl = (__le32 *)&request_pl,
 		.request_pl_sz = sizeof(request_pl),
-		.response_pl = &response_pl,
+		.response_pl = (__le32 *)&response_pl,
 		.response_pl_sz = sizeof(response_pl),
 		.complete = pci_doe_task_complete,
 		.private = &c,
 	};
 	int rc;
 
+	cpu_to_le32s(&request_pl);
+
 	rc = pci_doe_submit_task(doe_mb, &task);
 	if (rc < 0)
 		return rc;
@@ -340,6 +342,7 @@ static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
 	if (task.rv != sizeof(response_pl))
 		return -EIO;
 
+	le32_to_cpus(&response_pl);
 	*vid = FIELD_GET(PCI_DOE_DATA_OBJECT_DISC_RSP_3_VID, response_pl);
 	*protocol = FIELD_GET(PCI_DOE_DATA_OBJECT_DISC_RSP_3_PROTOCOL,
 			      response_pl);
diff --git a/include/linux/pci-doe.h b/include/linux/pci-doe.h
index ed9b4df792b8..43765eaf2342 100644
--- a/include/linux/pci-doe.h
+++ b/include/linux/pci-doe.h
@@ -34,6 +34,10 @@ struct pci_doe_mb;
  * @work: Used internally by the mailbox
  * @doe_mb: Used internally by the mailbox
  *
+ * Payloads are treated as opaque byte streams which are transmitted verbatim,
+ * without byte-swapping.  If payloads contain little-endian register values,
+ * the caller is responsible for conversion with cpu_to_le32() / le32_to_cpu().
+ *
  * The payload sizes and rv are specified in bytes with the following
  * restrictions concerning the protocol.
  *
@@ -45,9 +49,9 @@ struct pci_doe_mb;
  */
 struct pci_doe_task {
 	struct pci_doe_protocol prot;
-	u32 *request_pl;
+	__le32 *request_pl;
 	size_t request_pl_sz;
-	u32 *response_pl;
+	__le32 *response_pl;
 	size_t response_pl_sz;
 	int rv;
 	void (*complete)(struct pci_doe_task *task);
