X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Fpci%2Fprobe.c;h=e735c728e3b34aa441d1bc140e5473554af8385d;hb=9aa3d651a9199103eb6451aeb0ac1b66a6d770a6;hp=f53b8e85f137902f6e8b0667ae9f0539c06537a1;hpb=373ee21eecebc5c06786a803d99661a3657afcc7;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f53b8e85f137..e735c728e3b3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -6,6 +6,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <linux/of_device.h>
 #include <linux/of_pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/slab.h>
@@ -13,6 +14,7 @@
 #include <linux/cpumask.h>
 #include <linux/pci-aspm.h>
 #include <linux/aer.h>
+#include <linux/acpi.h>
 #include <asm-generic/pci-bridge.h>
 #include "pci.h"
 
@@ -1672,6 +1674,34 @@ static void pci_set_msi_domain(struct pci_dev *dev)
 	dev_set_msi_domain(&dev->dev, d);
 }
 
+/**
+ * pci_dma_configure - Setup DMA configuration
+ * @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 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)
+			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);
+}
+
 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 {
 	int ret;
@@ -1685,7 +1715,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 	dev->dev.dma_mask = &dev->dma_mask;
 	dev->dev.dma_parms = &dev->dma_parms;
 	dev->dev.coherent_dma_mask = 0xffffffffull;
-	of_pci_dma_configure(dev);
+	pci_dma_configure(dev);
 
 	pci_set_dma_max_seg_size(dev, 65536);
 	pci_set_dma_seg_boundary(dev, 0xffffffff);