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| author | Suthikulpanit, Suravee <Suravee.Suthikulpanit@amd.com> | 2015-06-10 18:08:54 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-06-15 14:40:49 +0200 |
| commit | 05ca556003b1d6b4df0b8831e4c07fad7f5bdd2c (patch) | |
| tree | dd1bc07e455fb16d12b56cb5bf593c3cb48a01e0 /drivers | |
| parent | arm64 : Introduce support for ACPI _CCA object (diff) | |
| download | linux-05ca556003b1d6b4df0b8831e4c07fad7f5bdd2c.tar.xz linux-05ca556003b1d6b4df0b8831e4c07fad7f5bdd2c.zip | |
device property: Introduces device_dma_is_coherent()
Currently, device drivers, which support both OF and ACPI,
need to call two separate APIs, of_dma_is_coherent() and
acpi_dma_is_coherent()) to determine device coherency attribute.
This patch simplifies this process by introducing a new device
property API, device_dma_is_coherent(), which calls the appropriate
interface based on the booting architecture.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/property.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c index 1d0b116cae95..e645852396ba 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -14,6 +14,7 @@ #include <linux/export.h> #include <linux/kernel.h> #include <linux/of.h> +#include <linux/of_address.h> #include <linux/property.h> /** @@ -519,3 +520,16 @@ unsigned int device_get_child_node_count(struct device *dev) return count; } 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); |