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spi: sh-msiof: Fix handling of write value for SISTR register

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commit 31a5fae4c5 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@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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hiromitsu Yamasaki
2018-09-05 10:49:37 +02:00
committed by Greg Kroah-Hartman
parent 228cc0731f
commit b6581ea1fd
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi-sh-msiof.c
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@@ -373,7 +373,8 @@ 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,