disable i2c1

hc

2024-05-11 645e752c5a84baeb21015cdc85fc05b7d16312c8

 kernel/arch/parisc/kernel/pci-dma.c
..
..
@@ -446,11 +446,27 @@
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 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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 		enum dma_data_direction dir)
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 {
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+	/*
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+	 * fdc: The data cache line is written back to memory, if and only if
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+	 * it is dirty, and then invalidated from the data cache.
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+	 */
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 	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
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 }
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 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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 		enum dma_data_direction dir)
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 {
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-	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
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+	unsigned long addr = (unsigned long) phys_to_virt(paddr);
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+
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+	switch (dir) {
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+	case DMA_TO_DEVICE:
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+	case DMA_BIDIRECTIONAL:
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+		flush_kernel_dcache_range(addr, size);
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+		return;
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+	case DMA_FROM_DEVICE:
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+		purge_kernel_dcache_range_asm(addr, addr + size);
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+		return;
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+	default:
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+		BUG();
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+	}
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 }