linux-kernel - Re: [PATCH v11 03/10] spi: Add multi-cs memories support in SPI core

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Date: Sun, 21 Jan 2024 01:04:27 +0000
From: Mark Brown <broonie@...nel.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>,
	tudor.ambarus@...aro.org, pratyush@...nel.org,
	miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
	sbinding@...nsource.cirrus.com, lee@...nel.org,
	james.schulman@...rus.com, david.rhodes@...rus.com,
	rf@...nsource.cirrus.com, perex@...ex.cz, tiwai@...e.com,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	michael@...le.cc, linux-mtd@...ts.infradead.org,
	nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
	claudiu.beznea@...on.dev, michal.simek@....com,
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	patches@...nsource.cirrus.com, linux-sound@...r.kernel.org,
	git@....com, amitrkcian2002@...il.com
Subject: Re: [PATCH v11 03/10] spi: Add multi-cs memories support in SPI core

On Sat, Jan 20, 2024 at 09:05:43AM -0800, Guenter Roeck wrote:

> FWIW, the problem is due to

> +#define SPI_CS_CNT_MAX 4

> in the offending patch, but apeed2400 FMC supports up to 5 SPI chip selects.
> 
>  static const struct aspeed_spi_data ast2400_fmc_data = {
>         .max_cs        = 5,
> 	^^^^^^^^^^^^^^^^^^^
>         .hastype       = true,

> Limiting .max_cs to 4 or increasing SPI_CS_CNT_MAX to 5 fixes the problem,
> though of course I don't know if increasing SPI_CS_CNT_MAX has other side
> effects.

Yeah, I was coming to a similar conclusion myself - the limit is just
too low.  I can't see any problem with increasing it.

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