parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu()

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Add comment in arch_sync_dma_for_device() and handle the direction flag in
arch_sync_dma_for_cpu().

When receiving data from the device (DMA_FROM_DEVICE) unconditionally
purge the data cache in arch_sync_dma_for_cpu().

Signed-off-by: Helge Deller <deller@gmx.de>

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Helge Deller 2023-05-17 15:52:30 +02:00

parent 44c026a73b

commit 59fa12646d

1 changed files with 17 additions and 1 deletions

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18

arch/parisc/kernel/pci-dma.c

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