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

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Message-ID: <Yyh/q5Ql8/QbCXqA@sirena.org.uk>
Date:   Mon, 19 Sep 2022 15:41:47 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     krzysztof.kozlowski@...aro.org, andi@...zian.org, kernel@...s.com,
        alim.akhtar@...sung.com, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/4] spi: spi-loopback-test: Add test to trigger DMA/PIO
 mixing

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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