Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android

[firefly-linux-kernel-4.4.55.git] / drivers / base / property.c

diff --git a/drivers/base/property.c b/drivers/base/property.c
index de40623bbd8a748fd81f3208810046d05861a75c..1325ff225cc4a5b37a7c0b3fe0b3d7946c37811e 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -598,18 +598,34 @@ unsigned int device_get_child_node_count(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_get_child_node_count);
 
-bool device_dma_is_coherent(struct device *dev)
+bool device_dma_supported(struct device *dev)
 {
-       bool coherent = false;
-
+       /* For DT, this is always supported.
+        * For ACPI, this depends on CCA, which
+        * is determined by the acpi_dma_supported().
+        */
        if (IS_ENABLED(CONFIG_OF) && dev->of_node)
-               coherent = of_dma_is_coherent(dev->of_node);
-       else
-               acpi_check_dma(ACPI_COMPANION(dev), &coherent);
+               return true;
+
+       return acpi_dma_supported(ACPI_COMPANION(dev));
+}
+EXPORT_SYMBOL_GPL(device_dma_supported);
 
-       return coherent;
+enum dev_dma_attr device_get_dma_attr(struct device *dev)
+{
+       enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED;
+
+       if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+               if (of_dma_is_coherent(dev->of_node))
+                       attr = DEV_DMA_COHERENT;
+               else
+                       attr = DEV_DMA_NON_COHERENT;
+       } else
+               attr = acpi_get_dma_attr(ACPI_COMPANION(dev));
+
+       return attr;
 }
-EXPORT_SYMBOL_GPL(device_dma_is_coherent);
+EXPORT_SYMBOL_GPL(device_get_dma_attr);
 
 /**
  * device_get_phy_mode - Get phy mode for given device