* [PATCH AUTOSEL 4.14 05/11] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate
[not found] <20200824163914.607152-1-sashal@kernel.org>
@ 2020-08-24 16:39 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2020-08-24 16:39 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Amelie Delaunay, Alain Volmat, Mark Brown, Sasha Levin, linux-spi,
linux-stm32, linux-arm-kernel
From: Amelie Delaunay <amelie.delaunay@st.com>
[ Upstream commit 9cc61973bf9385b19ff5dda4a2a7e265fcba85e4 ]
Fix spi->clk_rate when it is odd to the nearest lowest even value because
minimum SPI divider is 2.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Link: https://lore.kernel.org/r/1597043558-29668-4-git-send-email-alain.volmat@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/spi/spi-stm32.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index ba9743fa2326d..179749f354c33 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -254,7 +254,8 @@ static int stm32_spi_prepare_mbr(struct stm32_spi *spi, u32 speed_hz)
{
u32 div, mbrdiv;
- div = DIV_ROUND_UP(spi->clk_rate, speed_hz);
+ /* Ensure spi->clk_rate is even */
+ div = DIV_ROUND_UP(spi->clk_rate & ~0x1, speed_hz);
/*
* SPI framework set xfer->speed_hz to master->max_speed_hz if
--
2.25.1
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