diff options
| -rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/of/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/of/address.c | 6 |
3 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 01b6c00a7060..4ece20178145 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -93,6 +93,7 @@ config PPC select BINFMT_ELF select ARCH_HAS_ELF_RANDOMIZE select OF + select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE select OF_EARLY_FLATTREE select OF_RESERVED_MEM select HAVE_FTRACE_MCOUNT_RECORD diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index e2a48415d969..4ba54ffb3a4b 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -112,4 +112,8 @@ config OF_OVERLAY While this option is selected automatically when needed, you can enable it manually to improve device tree unit test coverage. +config OF_DMA_DEFAULT_COHERENT + # arches should select this if DMA is coherent by default for OF devices + bool + endif # OF diff --git a/drivers/of/address.c b/drivers/of/address.c index 4fe5fe21cd49..b3bf8762f4e8 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -1009,12 +1009,16 @@ EXPORT_SYMBOL_GPL(of_dma_get_range); * @np: device node * * It returns true if "dma-coherent" property was found - * for this device in DT. + * for this device in the DT, or if DMA is coherent by + * default for OF devices on the current platform. */ bool of_dma_is_coherent(struct device_node *np) { struct device_node *node = of_node_get(np); + if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT)) + return true; + while (node) { if (of_property_read_bool(node, "dma-coherent")) { of_node_put(node); |