On 08/26/2015 09:54 PM, 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.

I have included the following patch from Jeremy before cleaning up
the acpi_check_dma() function (in patch 2).

     http://www.spinics.net/lists/linux-usb/msg128582.html)

Changes from V2: (https://lkml.org/lkml/2015/8/25/549)
     * Return -ENOSUPP instead of -1 (per Rafael's suggestion)
     * Add WARN() when fail to setup DMA for PCI device when booting
       ACPI (per Arnd's suggestion)
     * Added Acked-by from Rob.
     * Minor clean up

Changes from V1: (https://lkml.org/lkml/2015/8/13/182)
     * Include patch 1 from Jeremy to enable support for _CCA=0
     * Clean up acpi_check_dma() per Bjorn suggestions
     * Split the original V1 patch into two patches (patch 3 and 4)


Jeremy Linton (1):
   Honor ACPI _CCA attribute setting

Suravee Suthikulpanit (3):
   ACPI/scan: Clean up acpi_check_dma
   PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
   PCI: ACPI: Add support for PCI device DMA coherency

For this series,

Reviewed-by: Hanjun Guo <redacted>

Thanks
Hanjun