VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Arnd Bergmann <arnd@arndb.de> 2023-03-27 14:13:03 +0200 committer: Emil Renner Berthing <emil.renner.berthing@canonical.com> 2023-07-20 20:53:34 +0200 commit: 1915323dc647affc94b874dcf3af0dbe7b8e5cba parent: 5e249778f3603d6d54bb3701ee68a01312cafc76
Commit Summary:
powerpc: dma-mapping: always clean cache in _for_device() op
Diffstat:
1 file changed, 1 insertion, 20 deletions
diff --git a/arch/powerpc/mm/dma-noncoherent.c b/arch/powerpc/mm/dma-noncoherent.c
index e108cacf877f..00e59a4faa2b 100644
--- a/arch/powerpc/mm/dma-noncoherent.c
+++ b/arch/powerpc/mm/dma-noncoherent.c
@@ -104,26 +104,7 @@ static void __dma_phys_op(phys_addr_t paddr, size_t size, enum dma_cache_op op)
 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
 		enum dma_data_direction dir)
 {
-	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);
-		break;
-	case DMA_BIDIRECTIONAL:	/* writeback and invalidate */
-		__dma_phys_op(start, end, DMA_CACHE_FLUSH);
-		break;
-	}
+	__dma_phys_op(start, end, DMA_CACHE_CLEAN);
 }
 
 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,