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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 <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2016-02-25 15:08:42 +09:00 committed by Ben Skeggs
parent 7d31cb7ca4
commit 9d0394c6be
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
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@ -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);