diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index a54ed354578b..ef4da3f0cd22 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -157,7 +157,12 @@ struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
 	/* Get the pagetable configuration from the domain */
 	if (adreno_smmu->cookie)
 		ttbr1_cfg = adreno_smmu->get_ttbr1_cfg(adreno_smmu->cookie);
-	if (!ttbr1_cfg)
+
+	/*
+	 * If you hit this WARN_ONCE() you are probably missing an entry in
+	 * qcom_smmu_impl_of_match[] in arm-smmu-qcom.c
+	 */
+	if (WARN_ONCE(!ttbr1_cfg, "No per-process page tables"))
 		return ERR_PTR(-ENODEV);
 
 	/*