linux-kernel - [PATCH 3.16 201/328] spi: sh-msiof: Fix handling of write value for SISTR register

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Message-ID: <lsq.1544392233.911724227@decadent.org.uk>
Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Hiromitsu Yamasaki" <hiromitsu.yamasaki.ym@...esas.com>,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        "Mark Brown" <broonie@...nel.org>
Subject: [PATCH 3.16 201/328] spi: sh-msiof: Fix handling of write value
 for SISTR register

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@...esas.com>

commit 31a5fae4c5a009898da6d177901d5328051641ff upstream.

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@...esas.com>
[geert: reword]
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/spi/spi-sh-msiof.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -325,7 +325,8 @@ static void sh_msiof_spi_set_mode_regs(s
 
 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,