diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
index f47df092bb0d..9f1ba0c57442 100644
--- a/drivers/accel/ivpu/ivpu_ipc.c
+++ b/drivers/accel/ivpu/ivpu_ipc.c
@@ -97,7 +97,11 @@ ivpu_ipc_tx_prepare(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
 
 	memset(tx_buf, 0, sizeof(*tx_buf));
 	tx_buf->ipc.data_addr = jsm_vpu_addr;
-	/* TODO: Set data_size to actual JSM message size, not union of all messages */
+	/*
+	 * Firmware expects full JSM message size regardless of the payload size.
+	 * Unused fields must be zeroed to allow future extensions of existing
+	 * commands without breaking compatibility.
+	 */
 	tx_buf->ipc.data_size = sizeof(*req);
 	tx_buf->ipc.channel = cons->channel;
 	tx_buf->ipc.src_node = 0;