Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails

[Timur Tabi]

On 11/10/2015 03:54 PM, Arnd Bergmann wrote:

> > In our drivers for 32-bit devices, we have to explicitly set the DMA
> > mask to 32-bits in order to get any DMA working.
>
> Do you mean PCI devices or platform devices?

Platform.

> Maybe the parent bus is lacking a dma-ranges property?

All of this applies only on device-tree platforms.  Sinan and I are 
working on an ACPI server platform.  So we never call 
of_dma_configure(), and we don't have a dma-ranges property.

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