Commit c8cc2655cc6c in the recent IOMMU changes breaks Tegra fbdev at least on the Pixel C with the following error message reporting a failed buffer allocation: [ 1.857660] drm drm: failed to allocate buffer of size 18432000 This error message is printed from tegra_bo_alloc() which is called by tegra_bo_create() in tegra_fbdev_probe(), which may indicate that other allocations would fail as well, not just the framebuffer. This may be connected with an error in of_iommu_configure() that became visible after commit 6ff6e184f1f4d: [ 1.200004] host1x drm: iommu configuration for device failed with -ENOENT Best regards, Diogo #regzbot introduced: c8cc2655cc6c
