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From:   Jaewon Kim <jaewon02.kim@samsung.com>
To:     Andi Shyti <andi.shyti@kernel.org>,
        Mark Brown <broonie@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Alim Akhtar <alim.akhtar@samsung.com>
Cc:     linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Chanho Park <chanho61.park@samsung.com>,
        Jaewon Kim <jaewon02.kim@samsung.com>
Subject: [PATCH] spi: s3c64xx: clear loopback bit after loopback test
Date:   Tue, 11 Jul 2023 17:20:20 +0900
Message-Id: <20230711082020.138165-1-jaewon02.kim@samsung.com>
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References: <CGME20230711082508epcas2p3088d488035e7e2910bf087d640e9c268@epcas2p3.samsung.com>
Precedence: bulk

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.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.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