diff options
Diffstat (limited to 'drivers/gpu/drm/etnaviv/etnaviv_drv.c')
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_drv.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c index 54eb653ca295..0b756ecb1bc2 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c @@ -614,6 +614,24 @@ static int etnaviv_pdev_probe(struct platform_device *pdev) } /* + * PTA and MTLB can have 40 bit base addresses, but + * unfortunately, an entry in the MTLB can only point to a + * 32 bit base address of a STLB. Moreover, to initialize the + * MMU we need a command buffer with a 32 bit address because + * without an MMU there is only an indentity mapping between + * the internal 32 bit addresses and the bus addresses. + * + * To make things easy, we set the dma_coherent_mask to 32 + * bit to make sure we are allocating the command buffers and + * TLBs in the lower 4 GiB address space. + */ + if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(40)) || + dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32))) { + dev_dbg(&pdev->dev, "No suitable DMA available\n"); + return -ENODEV; + } + + /* * Apply the same DMA configuration to the virtual etnaviv * device as the GPU we found. This assumes that all Vivante * GPUs in the system share the same DMA constraints. @@ -671,8 +689,6 @@ static int __init etnaviv_init(void) of_node_put(np); goto unregister_platform_driver; } - pdev->dev.coherent_dma_mask = DMA_BIT_MASK(40); - pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; ret = platform_device_add(pdev); if (ret) { |