[PATCH 1/4] spi: spi-loopback-test: Add test to trigger DMA/PIO mixing

[Mark Brown]

On Fri, Sep 16, 2022 at 01:39:48PM +0200, Vincent Whitchurch wrote:
> Add a test where a small and a large transfer in a message hit the same
> cache line.  This test currently fails on spi-s3c64xx on in DMA mode
> since it ends up mixing DMA and PIO without proper cache maintenance.

To make life easier with sending fixes as such fixes should come
at the start of a patch series and new features at the end.  This
avoids creating spurious dependencies.
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