On Tuesday 10 November 2015 15:59:18 Timur Tabi wrote: > 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. ACPI must have something else to mark DMA master devices and their capabilities, right? The platform should initialize the dma_mask pointer to a per-device mask and set both the dma_mask and dma_coherent_mask to 32 bits for any DMA master device, and the device driver should override that to be an appropriate mask based on its needs later. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
