From: Ralf Baechle Date: Tue, 11 Nov 2014 21:22:03 +0000 (+0100) Subject: MIPS: DMA: Explain the lack of special handling for R14000/R16000. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0dc294c05d9df09ca4a65071e370247eaab8638d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git MIPS: DMA: Explain the lack of special handling for R14000/R16000. Signed-off-by: Ralf Baechle --- 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) {