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...---- > arch/arm/mm/dma-mapping.c | 18 ------------------ > drivers/iommu/Kconfig | 7 ------- > drivers/media/platform/Kconfig | 1 - > 5 files changed, 1 insertion(+), 33 deletions(-) > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > index fa0b190f8a38..3c91de78535a 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -124,7 +124,7 @@ config NEED_SG_DMA_LENGTH > bool > > config ARM_DMA_USE_IOMMU > - bool > + def_bool y > select ARM_HAS_SG_CHAIN > select NEED_SG_DMA_LENGTH This doesn't work - as has recently...

...h/arm/include/asm/device.h | 6 ------ arch/arm/mm/dma-mapping.c | 18 ------------------ drivers/iommu/Kconfig | 7 ------- drivers/media/platform/Kconfig | 1 - 5 files changed, 1 insertion(+), 33 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fa0b190f8a38..3c91de78535a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -124,7 +124,7 @@ config NEED_SG_DMA_LENGTH bool config ARM_DMA_USE_IOMMU - bool + def_bool y select ARM_HAS_SG_CHAIN select NEED_SG_DMA_LENGTH diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h index 3234fe9b...

From: Thierry Reding <treding at nvidia.com> Depending on the kernel configuration, early ARM architecture setup code may have attached the GPU to a DMA/IOMMU mapping that transparently uses the IOMMU to back the DMA API. Tegra requires special handling for IOMMU backed buffers (a special bit in the GPU's MMU page tables indicates the memory path to take: via the SMMU or directly to the