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

From: [email-masked] (Timur Tabi)
Date: Tue, 10 Nov 2015 15:59:18 -0600

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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