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drm/nouveau/ttm: set the DMA mask for platform devices 

So far the DMA mask was not set for platform devices, which limited them
to a 32-bit physical space. Allow dma_set_mask() to be called for
non-PCI devices, and also take the IOMMU bit into account since it could
restrict the physically addressable space.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2015-09-04 19:59:34 +09:00 committed by Ben Skeggs
parent 524883bb48
commit b31cf78b93
1 changed files with 19 additions and 6 deletions
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15
drivers/gpu/drm/nouveau/nouveau_ttm.c
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@ -29,6 +29,9 @@
#include "nouveau_gem.h"
#include "drm_legacy.h"
#include <core/tegra.h>
static int
nouveau_vram_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
{
@ -353,6 +356,17 @@ nouveau_ttm_init(struct nouveau_drm *drm)
if (drm->agp.bridge ||
!dma_supported(dev->dev, DMA_BIT_MASK(bits)))
bits = 32;
} else if (device->func->tegra) {
struct nvkm_device_tegra *tegra = device->func->tegra(device);
/*
* If the platform can use a IOMMU, then the addressable DMA
* space is constrained by the IOMMU bit
*/
if (tegra->func->iommu_bit)
bits = min(bits, tegra->func->iommu_bit);
}
ret = dma_set_mask(dev->dev, DMA_BIT_MASK(bits));
if (ret)
@ -361,7 +375,6 @@ nouveau_ttm_init(struct nouveau_drm *drm)
ret = dma_set_coherent_mask(dev->dev, DMA_BIT_MASK(bits));
if (ret)
dma_set_coherent_mask(dev->dev, DMA_BIT_MASK(32));
}
ret = nouveau_ttm_global_init(drm);
if (ret)