diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c index 74a1ffa425f7..f302d2b5782a 100644 --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c @@ -1627,7 +1627,7 @@ nvkm_device_pci_new(struct pci_dev *pci_dev, const char *cfg, const char *dbg, const struct nvkm_device_pci_vendor *pciv; const char *name = NULL; struct nvkm_device_pci *pdev; - int ret; + int ret, bits; ret = pci_enable_device(pci_dev); if (ret) @@ -1679,17 +1679,17 @@ nvkm_device_pci_new(struct pci_dev *pci_dev, const char *cfg, const char *dbg, if (ret) return ret; - /* - * Set a preliminary DMA mask based on the .dma_bits member of the - * MMU subdevice. This allows other subdevices to create DMA mappings - * in their init() or oneinit() methods, which may be called before the - * TTM layer sets the DMA mask definitively. - * This is necessary for platforms where the default DMA mask of 32 - * does not cover any system memory, i.e., when all RAM is > 4 GB. - */ - if (pdev->device.mmu) - dma_set_mask_and_coherent(&pci_dev->dev, - DMA_BIT_MASK(pdev->device.mmu->dma_bits)); + /* Set DMA mask based on capabilities reported by the MMU subdev. */ + if (pdev->device.mmu && !pdev->device.pci->agp.bridge) + bits = pdev->device.mmu->dma_bits; + else + bits = 32; + + ret = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(bits)); + if (ret && bits != 32) { + dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32)); + pdev->device.mmu->dma_bits = 32; + } return 0; } |