csky: Optimize arch_sync_dma_for_cpu/device with dma_inv_range

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DMA_FROM_DEVICE only need to read dma data of memory into CPU cache,
so there is no need to clear cache before. Also clear + inv for
DMA_FROM_DEVICE won't cause problem, because the memory range for dma
won't be touched by software during dma working.

Changes for V2:
 - Remove clr cache and ignore the DMA_TO_DEVICE in _for_cpu.
 - Change inv to wbinv cache with DMA_FROM_DEVICE in _for_device.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>

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This commit is contained in:

Guo Ren 2019-07-30 17:16:28 +08:00

parent 4af9027d3f

commit ae76f635d4

4 changed files with 19 additions and 5 deletions

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1

arch/csky/include/asm/cache.h

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7

arch/csky/mm/cachev1.c

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11

arch/csky/mm/cachev2.c

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5

arch/csky/mm/dma-mapping.c

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