This is a note to let you know that I've just added the patch titled
spi: s3c64xx: clear loopback bit after loopback test
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-s3c64xx-clear-loopback-bit-after-loopback-test.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 18195ef4c4ce79e318fb5c779ab1ea8c6a1e88c8
Author: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>
Date: Tue Jul 11 17:20:20 2023 +0900
spi: s3c64xx: clear loopback bit after loopback test
[ 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>
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 7ac17f0d18a95..1a8b31e20baf2 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);
