On Wednesday 26 August 2015 00:33:25 Suravee Suthikulpanit wrote: > This patch adds support to setup DMA coherency for PCI device using > the ACPI _CCA attribute. According to the ACPI spec, the _CCA attribute > is required for ARM64. Therefore, this patch is a pre-req for ACPI PCI > support for ARM64 which is currently in development. > > Also, this should not affect other architectures that does not define > CONFIG_ACPI_CCA_REQUIRED, since the default value is coherent. > We only support ACPI on SBSA compliant platforms, and SBSA mandates cache-coherent PCI, so I don't think this is actually needed, just use coherent all the time and do WARN_ON(!CCA) to catch people that try to incorrectly use ACPI on a non-SBSA platform. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
