Re: [PATCH 10/21] csky: dma-mapping: skip invalidating before DMA from device

On Mon, Mar 27, 2023 at 8:15 PM Arnd Bergmann wrote: > > From: Arnd Bergmann > > csky is the only architecture that does a full flush for the > dma_sync_*_for_device(..., DMA_FROM_DEVICE) operation. The requirement > is only make sure there are no dirty cache lines for the buffer, > which can be

[PATCH 10/21] csky: dma-mapping: skip invalidating before DMA from device

From: Arnd Bergmann csky is the only architecture that does a full flush for the dma_sync_*_for_device(..., DMA_FROM_DEVICE) operation. The requirement is only make sure there are no dirty cache lines for the buffer, which can be either done through an invalidate operation (as on most architectur