[PATCH AUTOSEL 5.4 12/38] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate
From: Sasha Levin <sashal@kernel.org>
Date: 2020-08-24 17:05:58
Also in:
linux-spi, lkml, stable
Subsystem:
spi subsystem, st stm32 spi driver, the rest · Maintainers:
Mark Brown, Alain Volmat, Linus Torvalds
From: Amelie Delaunay <redacted> [ 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 <redacted> Signed-off-by: Alain Volmat <redacted> Link: https://lore.kernel.org/r/1597043558-29668-4-git-send-email-alain.volmat@st.com (local) 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 264a7e937f9eb..54fc14e08cee9 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c@@ -442,7 +442,8 @@ 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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