Re: [PATCH] spi: mediatek: Manually set dma_ops for spi_master device

From: Mark Brown
Date: Fri Jan 27 2017 - 08:38:11 EST

On Thu, Jan 26, 2017 at 09:26:13AM -0800, Dmitry Torokhov wrote:

> OTOH the full buffer used by cros ec *is* DMA-safe (allocated with
> kmalloc), it is that cors ec uses it at offset while transferring data
> piece by piece. Do we want to support this?

I'm not sure the complexity is worth it as a general feature, I worry
about the cost of worrying about cutting the transaction up to include a
PIO portion. That said that's just a gut feeling, if there were a
sufficiently simple/nice implementation it'd definitely avoid bugs.

To me part of DMA safety is the alignment restrictions.

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