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

--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.


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