device property: ACPI: Remove unused DMA APIs

These DMA APIs are replaced with the newer versions, which return
the enum dev_dma_attr. So, we can safely remove them.
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>

drivers/base/property.c

@@ -598,19 +598,6 @@ 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 coherent = false;
-
-	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 coherent;
-}
-EXPORT_SYMBOL_GPL(device_dma_is_coherent);
-
 bool device_dma_supported(struct device *dev)
 {
 	/* For DT, this is always supported.

include/acpi/acpi_bus.h

@@ -390,40 +390,6 @@ struct acpi_data_node {
 	struct completion kobj_done;
 };
 
-static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
-{
-	bool ret = false;
-
-	if (!adev)
-		return ret;
-
-	/**
-	 * Currently, we only support _CCA=1 (i.e. coherent_dma=1)
-	 * This should be equivalent to specifyig dma-coherent for
-	 * a device in OF.
-	 *
-	 * For the case when _CCA=0 (i.e. coherent_dma=0 && cca_seen=1),
-	 * There are two cases:
-	 * case 1. Do not support and disable DMA.
-	 * case 2. Support but rely on arch-specific cache maintenance for
-	 *         non-coherence DMA operations.
-	 * Currently, we implement case 2 above.
-	 *
-	 * For the case when _CCA is missing (i.e. cca_seen=0) and
-	 * platform specifies ACPI_CCA_REQUIRED, we do not support DMA,
-	 * and fallback to arch-specific default handling.
-	 *
-	 * See acpi_init_coherency() for more info.
-	 */
-	if (adev->flags.coherent_dma ||
-	    (adev->flags.cca_seen && IS_ENABLED(CONFIG_ARM64))) {
-		ret = true;
-		if (coherent)
-			*coherent = adev->flags.coherent_dma;
-	}
-	return ret;
-}
-
 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 {
 	return fwnode && (fwnode->type == FWNODE_ACPI

include/linux/acpi.h

@@ -574,11 +574,6 @@ static inline int acpi_device_modalias(struct device *dev,
 	return -ENODEV;
 }
 
-static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
-{
-	return false;
-}
-
 static inline bool acpi_dma_supported(struct acpi_device *adev)
 {
 	return false;

include/linux/property.h

@@ -174,8 +174,6 @@ struct property_set {
 
 void device_add_property_set(struct device *dev, struct property_set *pset);
 
-bool device_dma_is_coherent(struct device *dev);
-
 bool device_dma_supported(struct device *dev);
 
 enum dev_dma_attr device_get_dma_attr(struct device *dev);