[PATCH 2/3] drm/msm: stop supporting no-IOMMU configuration

[Dmitry Baryshkov]

With the switch to GPUVM the msm driver no longer supports the no-IOMMU
configurations (even without the actual GPU). Return an error in case we
face the lack of the IOMMU for an MDP4 device.

Fixes: 111fdd2198e6 ("drm/msm: drm_gpuvm conversion")
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/msm_kms.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_kms.c b/drivers/gpu/drm/msm/msm_kms.c
index 
6889f1c1e72121dcc735fa460ea04cdab11c6705..2e2ab93b0f6f6a462e99d54b33da6dc21b1e8435
 100644
--- a/drivers/gpu/drm/msm/msm_kms.c
+++ b/drivers/gpu/drm/msm/msm_kms.c
@@ -201,8 +201,8 @@ struct drm_gpuvm *msm_kms_init_vm(struct drm_device *dev)
                return ERR_CAST(mmu);
 
        if (!mmu) {
-               drm_info(dev, "no IOMMU, fallback to phys contig buffers for 
scanout\n");
-               return NULL;
+               drm_info(dev, "no IOMMU configuration is no longer 
supported\n");
+               return ERR_PTR(-ENODEV);
        }
 
        vm = msm_gem_vm_create(dev, mmu, "mdp_kms",

-- 
2.39.5