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

From: Timur Tabi
Date: Tue Nov 10 2015 - 16:59:26 EST

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?


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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