author: Arnd Bergmann <arnd@arndb.de> 2023-03-27 14:13:02 +0200
committer: Emil Renner Berthing <emil.renner.berthing@canonical.com> 2023-07-20 20:53:34 +0200
commit: 5e249778f3603d6d54bb3701ee68a01312cafc76
parent: 151d3d93fe82d28713541fb4d25324944b1e72f3
Commit Summary:
Diffstat:
1 file changed, 4 insertions, 14 deletions
diff --git a/arch/powerpc/mm/dma-noncoherent.c b/arch/powerpc/mm/dma-noncoherent.c
index f10869d27de5..e108cacf877f 100644
--- a/arch/powerpc/mm/dma-noncoherent.c
+++ b/arch/powerpc/mm/dma-noncoherent.c
@@ -132,21 +132,11 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
switch (direction) {
case DMA_NONE:
BUG();
- case DMA_FROM_DEVICE:
- /*
- * invalidate only when cache-line aligned otherwise there is
- * the potential for discarding uncommitted data from the cache
- */
- if ((start | end) & (L1_CACHE_BYTES - 1))
- __dma_phys_op(start, end, DMA_CACHE_FLUSH);
- else
- __dma_phys_op(start, end, DMA_CACHE_INVAL);
- break;
- case DMA_TO_DEVICE: /* writeback only */
- __dma_phys_op(start, end, DMA_CACHE_CLEAN);
+ case DMA_TO_DEVICE:
break;
- case DMA_BIDIRECTIONAL: /* writeback and invalidate */
- __dma_phys_op(start, end, DMA_CACHE_FLUSH);
+ case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ __dma_phys_op(start, end, DMA_CACHE_INVAL);
break;
}
}