hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

MIPS: DMA: Explain the lack of special handling for R14000/R16000. 

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2014-11-11 22:22:03 +01:00
parent 341097f17c
commit 0dc294c05d
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/mips/mm/dma-default.c
View File

@ -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; * Warning on the terminology - Linux calls an uncached area coherent;
* MIPS terminology calls memory areas with hardware maintained coherency * MIPS terminology calls memory areas with hardware maintained coherency
* coherent. * 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) static inline int cpu_needs_post_dma_flush(struct device *dev)
{ {