diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 8a78580a2a721f..72044f8ec88329 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -405,6 +405,7 @@ static void mlx5_ib_page_fault_resume(struct mlx5_ib_dev *dev,
 static struct mlx5_ib_mr *implicit_get_child_mr(struct mlx5_ib_mr *imr,
 						unsigned long idx)
 {
+	int order = order_base_2(MLX5_IMR_MTT_ENTRIES);
 	struct mlx5_ib_dev *dev = mr_to_mdev(imr);
 	struct ib_umem_odp *odp;
 	struct mlx5_ib_mr *mr;
@@ -417,7 +418,8 @@ static struct mlx5_ib_mr *implicit_get_child_mr(struct mlx5_ib_mr *imr,
 	if (IS_ERR(odp))
 		return ERR_CAST(odp);
 
-	mr = mlx5_mr_cache_alloc(dev, &dev->cache.ent[MLX5_IMR_MTT_CACHE_ENTRY],
+	BUILD_BUG_ON(order > MKEY_CACHE_LAST_STD_ENTRY);
+	mr = mlx5_mr_cache_alloc(dev, &dev->cache.ent[order],
 				 imr->access_flags);
 	if (IS_ERR(mr)) {
 		ib_umem_odp_release(odp);
@@ -1591,20 +1593,8 @@ void mlx5_odp_init_mkey_cache_entry(struct mlx5_cache_ent *ent)
 {
 	if (!(ent->dev->odp_caps.general_caps & IB_ODP_SUPPORT_IMPLICIT))
 		return;
-
-	switch (ent->order - 2) {
-	case MLX5_IMR_MTT_CACHE_ENTRY:
-		ent->ndescs = MLX5_IMR_MTT_ENTRIES;
-		ent->access_mode = MLX5_MKC_ACCESS_MODE_MTT;
-		ent->limit = 0;
-		break;
-
-	case MLX5_IMR_KSM_CACHE_ENTRY:
-		ent->ndescs = mlx5_imr_ksm_entries;
-		ent->access_mode = MLX5_MKC_ACCESS_MODE_KSM;
-		ent->limit = 0;
-		break;
-	}
+	ent->ndescs = mlx5_imr_ksm_entries;
+	ent->access_mode = MLX5_MKC_ACCESS_MODE_KSM;
 }
 
 static const struct ib_device_ops mlx5_ib_dev_odp_ops = {
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index d476255c9a3f0d..f79c20d50eb48b 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -734,7 +734,6 @@ enum {
 
 enum {
 	MKEY_CACHE_LAST_STD_ENTRY = 20,
-	MLX5_IMR_MTT_CACHE_ENTRY,
 	MLX5_IMR_KSM_CACHE_ENTRY,
 	MAX_MKEY_CACHE_ENTRIES
 };