From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> The r8a7795 IPMMU supports 40-bit bus mastering. Both the coherent DMA mask and the streaming DMA mask are set to unlock the 40-bit address space for coherent allocations and streaming operations. Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> --- Changes since V4: - None Changes since V3: - None Changes since V2: - Updated the code and commit message to use 40 bits instead of 64 bits Changes since V1: - Updated the commit message drivers/iommu/ipmmu-vmsa.c | 1 + 1 file changed, 1 insertion(+) --- 0012/drivers/iommu/ipmmu-vmsa.c +++ work/drivers/iommu/ipmmu-vmsa.c 2017-10-16 20:37:31.480607110 +0900 @@ -996,6 +996,7 @@ static int ipmmu_probe(struct platform_d spin_lock_init(&mmu->lock); bitmap_zero(mmu->ctx, IPMMU_CTX_MAX); mmu->features = of_device_get_match_data(&pdev->dev); + dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40)); /* Map I/O memory and request IRQ. */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
