linux-kernel - Re: [PATCH 2/8] spi: spi-s3s64xx: Add S3C64XX_SPI_QUIRK_CS

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Message-ID: <20200819130624.GB18970@kozik-lap>
Date:   Wed, 19 Aug 2020 15:06:24 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Lukasz Stelmach <l.stelmach@...sung.com>
Cc:     Kukjin Kim <kgene@...nel.org>, Andi Shyti <andi@...zian.org>,
        Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        m.szyprowski@...sung.com, b.zolnierkie@...sung.com
Subject: Re: [PATCH 2/8] spi: spi-s3s64xx: Add S3C64XX_SPI_QUIRK_CS_AUTO for
 Exynos3250

On Wed, Aug 19, 2020 at 03:01:21PM +0200, Lukasz Stelmach wrote:
> It was <2020-08-19 śro 14:39>, when Krzysztof Kozlowski wrote:
> > On Wed, Aug 19, 2020 at 02:32:02PM +0200, Łukasz Stelmach wrote:
> >> Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
> >
> > Add a quirk - why?
> 
> Because stuff does not work without it and works with it and it is
> turned on for other SoCs which have simmilar SPI HW.
> 
> > There is here no commit msg, no explanation.
> 
> As I wrote in the cover letter, this and previous commits make things
> work on Exynos3250 (ARTIK5 precisely). I can't explain why. I read
> everything I could about this HW and there were no details about
> automatic CS handling other than how to turn it on and off.

At least this information would be useful. If vendor kernel also does
it, that's another argument to use, since there are no better ones...

Best regards,
Krzysztof