summaryrefslogtreecommitdiffstats
path: root/arch/mips/Kconfig
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/Kconfig')
-rw-r--r--arch/mips/Kconfig9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d50fafd7bf3a..aff1cadeea43 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1119,7 +1119,14 @@ config DMA_PERDEV_COHERENT
config DMA_NONCOHERENT
bool
- select ARCH_HAS_DMA_MMAP_PGPROT
+ #
+ # MIPS allows mixing "slightly different" Cacheability and Coherency
+ # Attribute bits. It is believed that the uncached access through
+ # KSEG1 and the implementation specific "uncached accelerated" used
+ # by pgprot_writcombine can be mixed, and the latter sometimes provides
+ # significant advantages.
+ #
+ select ARCH_HAS_DMA_WRITE_COMBINE
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_HAS_UNCACHED_SEGMENT
select NEED_DMA_MAP_STATE