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
drivers/acpi/acpi_platform.c | 7 ++++++-
drivers/acpi/glue.c | 6 +++---
drivers/acpi/scan.c | 39 +++++++++++++++++++++++++++++++++++++++
drivers/base/property.c | 10 +++++++---
drivers/of/of_pci.c | 20 --------------------
drivers/pci/probe.c | 35 +++++++++++++++++++++++++++++++++--
include/acpi/acpi_bus.h | 35 ++---------------------------------
include/linux/acpi.h | 4 ++--
include/linux/of_pci.h | 3 ---
9 files changed, 92 insertions(+), 67 deletions(-)
--
2.1.0
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