From cc64568b522b64fb8f8c607da9eb4e2d9f72d0cf Mon Sep 17 00:00:00 2001 From: Dmitry Baryshkov Date: Wed, 3 Sep 2025 13:51:49 +0300 Subject: [PATCH] drm/msm/mdp4: stop supporting no-IOMMU configuration 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 Patchwork: https://patchwork.freedesktop.org/patch/672557/ Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c index 0952c7f18abdc..4d1ea9b261917 100644 --- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c +++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c @@ -463,9 +463,9 @@ static int mdp4_kms_init(struct drm_device *dev) ret = PTR_ERR(mmu); goto fail; } else if (!mmu) { - DRM_DEV_INFO(dev->dev, "no iommu, fallback to phys " - "contig buffers for scanout\n"); - vm = NULL; + DRM_DEV_INFO(dev->dev, "no IOMMU, bailing out\n"); + ret = -ENODEV; + goto fail; } else { vm = msm_gem_vm_create(dev, mmu, "mdp4", 0x1000, 0x100000000 - 0x1000, -- 2.47.3