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Message-ID: <000001d9b3d3$b81deaa0$2859bfe0$@samsung.com>
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
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