diff options
| author | Suthikulpanit, Suravee <Suravee.Suthikulpanit@amd.com> | 2015-10-28 15:50:54 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-11-07 01:29:22 +0100 |
| commit | 29dbe1f0af88b4162d2b57e790db7a51ab061f35 (patch) | |
| tree | cf2efa83990788cde278469df666cf2fbae7b9bc /drivers/pci | |
| parent | 50230713b63941f4b6b562eea0834f751aa0801e (diff) | |
PCI: ACPI: Add support for PCI device DMA coherency
This patch adds support for setting up PCI device DMA coherency from
ACPI _CCA object that should normally be specified in the DSDT node
of its PCI host bridge.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/probe.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index d35f83d80b15..064078e11017 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -13,6 +13,7 @@ #include <linux/module.h> #include <linux/cpumask.h> #include <linux/pci-aspm.h> +#include <linux/acpi.h> #include <asm-generic/pci-bridge.h> #include "pci.h" @@ -1639,7 +1640,7 @@ static void pci_set_msi_domain(struct pci_dev *dev) * @dev: ptr to pci_dev struct of the PCI device * * Function to update PCI devices's DMA configuration using the same - * info from the OF node of host bridge's parent (if any). + * info from the OF node or ACPI node of host bridge's parent (if any). */ static void pci_dma_configure(struct pci_dev *dev) { @@ -1648,6 +1649,15 @@ static void pci_dma_configure(struct pci_dev *dev) if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) { if (bridge->parent) of_dma_configure(&dev->dev, bridge->parent->of_node); + } else if (has_acpi_companion(bridge)) { + struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); + enum dev_dma_attr attr = acpi_get_dma_attr(adev); + + if (attr == DEV_DMA_NOT_SUPPORTED) + dev_warn(&dev->dev, "DMA not supported.\n"); + else + arch_setup_dma_ops(&dev->dev, 0, 0, NULL, + attr == DEV_DMA_COHERENT); } pci_put_host_bridge_device(bridge); |