From 9d0394c6bed5b4b78167cc0eea294754a9cb2bbc Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Thu, 25 Feb 2016 15:08:42 +0900 Subject: [PATCH] drm/nouveau/instmem/gk20a: set DMA mask early DMA mask is typically set in nouveau_ttm_init(), but this function is called late during initialization and GK20A's instmem will have called DMA functions before this happens. Having a wrongly set DMA mask can result in the use of unneeded bounce buffers. Set it early to avoid this. Signed-off-by: Alexandre Courbot Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c index 92cc7c685eda..9afa5f3e3c1c 100644 --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c @@ -280,6 +280,15 @@ nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func, goto free; } + /** + * The IOMMU bit defines the upper limit of the GPU-addressable space. + * This will be refined in nouveau_ttm_init but we need to do it early + * for instmem to behave properly + */ + ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(tdev->func->iommu_bit)); + if (ret) + goto free; + nvkm_device_tegra_probe_iommu(tdev); ret = nvkm_device_tegra_power_up(tdev); -- 2.34.1