Messages in this thread | | | Date | Wed, 20 May 2015 16:32:45 -0500 | From | Suravee Suthikulanit <> | Subject | Re: [V4 PATCH 4/6] device property: Introduces device_dma_is_coherent() |
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On 5/20/2015 5:28 AM, Will Deacon wrote: > On Fri, May 15, 2015 at 10:23:12PM +0100, Suravee Suthikulpanit wrote: >> 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> >> CC: Rafael J. Wysocki <rjw@rjwysocki.net> >> --- >> drivers/base/property.c | 12 ++++++++++++ >> include/linux/property.h | 2 ++ >> 2 files changed, 14 insertions(+) >> >> diff --git a/drivers/base/property.c b/drivers/base/property.c >> index 1d0b116..8123c6e 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 +520,14 @@ 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) >> +{ >> + if (IS_ENABLED(CONFIG_OF) && dev->of_node) >> + return of_dma_is_coherent(dev->of_node); >> + else if (has_acpi_companion(dev)) >> + return acpi_dma_is_coherent(acpi_node(dev->fwnode)); > > I don't think you need the has_acpi_companion check, as acpi_node handles > this and acpi_dma_is_coherent(NULL) returns false. > > Will > You are right.
Thanks,
Suravee
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