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Message-Id: <20250706-msm-no-iommu-v1-1-9e8274b30c33@oss.qualcomm.com> Date: Sun, 06 Jul 2025 13:50:36 +0300 From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com> To: Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>, Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Antonino Maniscalco <antomani103@...il.com> Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/3] 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 <dmitry.baryshkov@....qualcomm.com> --- 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 0952c7f18abdca4a7e24e5af8a7132456bfec129..88296c41d1a5eb0e16cb6ec4d0475000b6318c4e 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 configuration is no longer supported\n"); + ret = -ENODEV; + goto fail; } else { vm = msm_gem_vm_create(dev, mmu, "mdp4", 0x1000, 0x100000000 - 0x1000, -- 2.39.5
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