From 31a5fae4c5a009898da6d177901d5328051641ff Mon Sep 17 00:00:00 2001
From: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
Date: Wed, 5 Sep 2018 10:49:37 +0200
Subject: [PATCH] spi: sh-msiof: Fix handling of write value for SISTR register
Git-commit: 31a5fae4c5a009898da6d177901d5328051641ff
Patch-mainline: v4.19-rc6
References: bsc#1051510
This patch changes writing to the SISTR register according to the H/W
user's manual.
The TDREQ bit and RDREQ bits of SISTR are read-only, and must be written
their initial values of zero.
Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
[geert: reword]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/spi/spi-sh-msiof.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index bfe4e6d4f7bf..101cd6aae2ea 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -397,7 +397,8 @@ static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
{
- sh_msiof_write(p, STR, sh_msiof_read(p, STR));
+ sh_msiof_write(p, STR,
+ sh_msiof_read(p, STR) & ~(STR_TDREQ | STR_RDREQ));
}
static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
--
2.18.0