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 5ff5ab0411b3..d05ea43f24e0 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -89,6 +89,7 @@ config PPC select ARCH_MIGHT_HAVE_PC_SERIO select BINFMT_ELF 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 2dcb0541012d..a3bec421551e 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -78,4 +78,8 @@ config OF_RESERVED_MEM help Helpers to allow for reservation of memory regions +config OF_DMA_DEFAULT_COHERENT + # arches should select this if DMA is coherent by default for OF devices + bool + endmenu # OF diff --git a/drivers/of/address.c b/drivers/of/address.c index 01570bf23842..2f108ab4e7f6 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -812,12 +812,16 @@ 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); |