Implicit backing DMA with IOMMU breaks Nouveau on Tegra, the current approach with detaching device from IOMMU that was added in commit b59fb482b522 ("drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping") works only for arm32 which has the CONFIG_ARM_DMA_USE_IOMMU, but not for arm64 which doesn't have that config option. Drivers core now allows to avoid the implicit backing, that is a universal solution unlike the current variant with the detaching.
Signed-off-by: Dmitry Osipenko digetx@gmail.com --- drivers/gpu/drm/nouveau/nouveau_platform.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.c b/drivers/gpu/drm/nouveau/nouveau_platform.c index 039e23548e08..0b57f4f9b638 100644 --- a/drivers/gpu/drm/nouveau/nouveau_platform.c +++ b/drivers/gpu/drm/nouveau/nouveau_platform.c @@ -90,6 +90,7 @@ MODULE_DEVICE_TABLE(of, nouveau_platform_match); struct platform_driver nouveau_platform_driver = { .driver = { .name = "nouveau", + .no_implicit_iommu = true, .of_match_table = of_match_ptr(nouveau_platform_match), }, .probe = nouveau_platform_probe,