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@xxxxxxx>
CC: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
CC: Catalin Marinas <catalin.marinas@xxxxxxx>
CC: Rob Herring <robh+dt@xxxxxxxxxx>
CC: Will Deacon <will.deacon@xxxxxxx>
CC: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
CC: Murali Karicheri <m-karicheri2@xxxxxx>
---
drivers/pci/probe.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 09264f8..6e9f7e6 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1642,17 +1642,26 @@ 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)
{
struct device *bridge = pci_get_host_bridge_device(dev);
if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) {
- if (!bridge->parent)
- return;
-
- of_dma_configure(&dev->dev, bridge->parent->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_node(bridge->fwnode);
+ enum dev_dma_attr attr = acpi_get_dma_attr(adev);
+
+ if (attr != DEV_DMA_NOT_SUPPORTED)
+ arch_setup_dma_ops(&dev->dev, 0, 0, NULL,
+ attr == DEV_DMA_COHERENT);
+ else
+ WARN(1, FW_BUG "PCI device %s fail to setup DMA.\n",
+ pci_name(dev));
}
pci_put_host_bridge_device(bridge);
--
2.1.0
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