linux-kernel - Re: [PATCH 11/14] spi: spi-fsl-dspi: Halt the module after a new message transfer

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Message-ID: <aB6psNq3F-bsAA3e@finisterre.sirena.org.uk>
Date: Sat, 10 May 2025 10:19:44 +0900
From: Mark Brown <broonie@...nel.org>
To: James Clark <james.clark@...aro.org>
Cc: Vladimir Oltean <olteanv@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Frank Li <Frank.Li@....com>,
	Chester Lin <chester62515@...il.com>,
	Matthias Brugger <mbrugger@...e.com>,
	Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>,
	NXP S32 Linux Team <s32@....com>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, larisa.grigore@....com,
	arnd@...aro.org, andrei.stefanescu@....com,
	dan.carpenter@...aro.org, linux-spi@...r.kernel.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Bogdan-Gabriel Roman <bogdan-gabriel.roman@....com>
Subject: Re: [PATCH 11/14] spi: spi-fsl-dspi: Halt the module after a new
 message transfer

On Fri, May 09, 2025 at 12:05:58PM +0100, James Clark wrote:
> From: Bogdan-Gabriel Roman <bogdan-gabriel.roman@....com>
> 
> The XSPI mode implementation in this driver still uses the EOQ flag to
> signal the last word in a transmission and deassert the PCS signal.
> However, at speeds lower than ~200kHZ, the PCS signal seems to remain
> asserted even when SR[EOQF] = 1 indicates the end of a transmission.
> This is a problem for target devices which require the deassertation of
> the PCS signal between transfers.

This also looks like it might be a fix?

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