linux-kernel - Re: [PATCH v4 0/6] spi: spi-fsl-dspi: Target mode improvements

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Message-ID: <2775ece5-f4ce-42d0-9bf4-689df6527fc2@sirena.org.uk>
Date: Tue, 1 Jul 2025 14:18:39 +0100
From: Mark Brown <broonie@...nel.org>
To: James Clark <james.clark@...aro.org>
Cc: Vladimir Oltean <vladimir.oltean@....com>,
	Vladimir Oltean <olteanv@...il.com>, Arnd Bergmann <arnd@...db.de>,
	Larisa Grigore <larisa.grigore@....com>,
	Frank Li <Frank.li@....com>, Christoph Hellwig <hch@....de>,
	linux-spi@...r.kernel.org, imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/6] spi: spi-fsl-dspi: Target mode improvements

On Tue, Jul 01, 2025 at 01:42:46PM +0100, James Clark wrote:
> On 30/06/2025 4:26 pm, Vladimir Oltean wrote:
> > On Fri, Jun 27, 2025 at 11:21:36AM +0100, James Clark wrote:

> > So after your patch set, DMA mode on LS1028A becomes more performant and
> > should replace XSPI. This is an outstanding result. That can be done as
> > follow-up work.

> I wonder if latency could be higher despite increased throughput? It
> probably wouldn't be a big enough increase that anyone would care. And based
> on the structure of the driver if throughput is higher the latency might
> even be lower.

Some CAN users are likely to care, some of them care a lot about
throughput so will be happy but AIUI some are very focused on round trip
times.  That's a fairly specialist use case though.

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