[PATCH 6.1 100/183] spi: s3c64xx: clear loopback bit after loopback test

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From: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>

[ Upstream commit 9ec3c5517e22a12d2ff1b71e844f7913641460c6 ]

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@xxxxxxxxxxx>
Fixes: ffb7bcd3b27e ("spi: s3c64xx: support loopback mode")
Reviewed-by: Chanho Park <chanho61.park@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230711082020.138165-1-jaewon02.kim@xxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 71d324ec9a70a..1480df7b43b3f 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -668,6 +668,8 @@ 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);
 
-- 
2.39.2






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