On 10/30/2015 04:42 PM, Sinan Kaya wrote:
if (WARN_ON(!pdev->dev.dma_mask))
return -ENXIO;
The dma mask has to always be set by the platform code before probe()
is called. If it is not set, you are not allowed to perform DMA.
I tested this on an ACPI platform BTW when I was working on the initial
implementation.
PowerPC sets the mask to 32 bits by default:
http://lxr.free-electrons.com/ident?i=arch_setup_pdev_archdata
Should we do something similar in ARM64? Today, we have to manually set
the DMA mask in all drivers.
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