linux-kernel - Re: [PATCH v2 1/9] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and s3c64xx_enable

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Message-ID: <20200822120121.GA20423@kozik-lap>
Date:   Sat, 22 Aug 2020 14:01:21 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Łukasz 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 v2 1/9] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and
 s3c64xx_enable_datapath()

On Fri, Aug 21, 2020 at 06:13:53PM +0200, Łukasz Stelmach wrote:
> This and the next patch fix issues with DMA transfers bigger than

Just:
"Fix issues with DMA transfers..."

The order of patches could change when applying and backporting.

Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof


> 512 bytes on Exynos3250. Without the patches such transfers fail
> to complete. This solution to the problem is found in the vendor kernel
> for ARTIK5 boards based on Exynos3250.
> 
> Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
> ---
>  drivers/spi/spi-s3c64xx.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> index 924b24441789..26c7cb79cd78 100644
> --- a/drivers/spi/spi-s3c64xx.c
> +++ b/drivers/spi/spi-s3c64xx.c
> @@ -685,11 +685,11 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master,
>  		sdd->state &= ~RXBUSY;
>  		sdd->state &= ~TXBUSY;
>  
> -		s3c64xx_enable_datapath(sdd, xfer, use_dma);
> -
>  		/* Start the signals */
>  		s3c64xx_spi_set_cs(spi, true);
>  
> +		s3c64xx_enable_datapath(sdd, xfer, use_dma);
> +
>  		spin_unlock_irqrestore(&sdd->lock, flags);
>  
>  		if (use_dma)
> -- 
> 2.26.2
>