Merge tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...

[firefly-linux-kernel-4.4.55.git] / drivers / pci / probe.c

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f53b8e85f137902f6e8b0667ae9f0539c06537a1..e735c728e3b34aa441d1bc140e5473554af8385d 100644 (file)
--- 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);