linux-kernel - RE: [PATCH] spi: s3c64xx: clear loopback bit after loopback test

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Date:   Tue, 11 Jul 2023 17:43:08 +0900
From:   "Chanho Park" <chanho61.park@...sung.com>
To:     "'Jaewon Kim'" <jaewon02.kim@...sung.com>,
        "'Andi Shyti'" <andi.shyti@...nel.org>,
        "'Mark Brown'" <broonie@...nel.org>,
        "'Krzysztof Kozlowski'" <krzysztof.kozlowski@...aro.org>,
        "'Alim Akhtar'" <alim.akhtar@...sung.com>
Cc:     <linux-spi@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] spi: s3c64xx: clear loopback bit after loopback test

Hi Jaewon,

> -----Original Message-----
> From: Jaewon Kim <jaewon02.kim@...sung.com>
> Sent: Tuesday, July 11, 2023 5:20 PM
> To: Andi Shyti <andi.shyti@...nel.org>; Mark Brown <broonie@...nel.org>;
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>; Alim Akhtar
> <alim.akhtar@...sung.com>
> Cc: linux-spi@...r.kernel.org; linux-samsung-soc@...r.kernel.org; linux-
> arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Chanho Park
> <chanho61.park@...sung.com>; Jaewon Kim <jaewon02.kim@...sung.com>
> Subject: [PATCH] spi: s3c64xx: clear loopback bit after loopback test
> 
> When SPI loopback transfer is performed, S3C64XX_SPI_MODE_SELF_LOOPBACK
> bit still remained. It works as loopback even if the next transfer is not
> spi loopback mode.
> If not SPI_LOOP, needs to clear S3C64XX_SPI_MODE_SELF_LOOPBACK bit.
> 

In order for this patch to be sent to the stable tree, below tag is required.
Fixes: ffb7bcd3b27e ("spi: s3c64xx: support loopback mode")

Otherwise, looks good to me.
Reviewed-by: Chanho Park <chanho61.park@...sung.com>

Best Regards,
Chanho Park

> Signed-off-by: Jaewon Kim <jaewon02.kim@...sung.com>
> ---
>  drivers/spi/spi-s3c64xx.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index
> fd55697144cc..b6c2659a66ca 100644
> --- a/drivers/spi/spi-s3c64xx.c
> +++ b/drivers/spi/spi-s3c64xx.c
> @@ -684,6 +684,8 @@ static int s3c64xx_spi_config(struct
> s3c64xx_spi_driver_data *sdd)
> 
>  	if ((sdd->cur_mode & SPI_LOOP) && sdd->port_conf->has_loopback)
>  		val |= S3C64XX_SPI_MODE_SELF_LOOPBACK;
> +	else
> +		val &= ~S3C64XX_SPI_MODE_SELF_LOOPBACK;
> 
>  	writel(val, regs + S3C64XX_SPI_MODE_CFG);
> 
> --
> 2.17.1