diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2014-11-11 22:22:03 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-11-24 07:45:08 +0100 |
| commit | 0dc294c05d9df09ca4a65071e370247eaab8638d (patch) | |
| tree | 2310d36d1f94bc24057dba1451e3dffc40099094 /arch/mips/mm/dma-default.c | |
| parent | 341097f17c76b3dd39539526a2af9e7fff43705e (diff) | |
MIPS: DMA: Explain the lack of special handling for R14000/R16000.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/dma-default.c')
| -rw-r--r-- | arch/mips/mm/dma-default.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index 33ba3c558fe4..af5f046e627e 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -61,6 +61,11 @@ static inline struct page *dma_addr_to_page(struct device *dev, * Warning on the terminology - Linux calls an uncached area coherent; * MIPS terminology calls memory areas with hardware maintained coherency * coherent. + * + * Note that the R14000 and R16000 should also be checked for in this + * condition. However this function is only called on non-I/O-coherent + * systems and only the R10000 and R12000 are used in such systems, the + * SGI IP28 Indigo² rsp. SGI IP32 aka O2. */ static inline int cpu_needs_post_dma_flush(struct device *dev) { |