Commit 5f26ad58 authored by Sam Protsenko's avatar Sam Protsenko Committed by Joerg Roedel
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iommu/exynos: Set correct dma mask for SysMMU v5+ 



SysMMU v5+ supports 36 bit physical address space. Set corresponding DMA
mask to avoid falling back to SWTLBIO usage in dma_map_single() because
of failed dma_capable() check.

The original code for this fix was suggested by Marek.

Signed-off-by: default avatarSam Protsenko <semen.protsenko@linaro.org>
Co-developed-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Acked-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220714165550.8884-4-semen.protsenko@linaro.org


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent fce398d2

drivers/iommu/exynos-iommu.c

+10 −0
Original line number Diff line number Diff line
@@ -646,6 +646,14 @@ static int exynos_sysmmu_probe(struct platform_device *pdev) 
		}

	}



	if (MMU_MAJ_VER(data->version) >= 5) {

		ret = dma_set_mask(dev, DMA_BIT_MASK(36));

		if (ret) {

			dev_err(dev, "Unable to set DMA mask: %d\n", ret);

			goto err_dma_set_mask;

		}

	}



	/*

	 * use the first registered sysmmu device for performing

	 * dma mapping operations on iommu page tables (cpu cache flush)
@@ -657,6 +665,8 @@ static int exynos_sysmmu_probe(struct platform_device *pdev) 


	return 0;



err_dma_set_mask:

	iommu_device_unregister(&data->iommu);

err_iommu_register:

	iommu_device_sysfs_remove(&data->iommu);

	return ret;