Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 05/11] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate | Date | Mon, 24 Aug 2020 12:39:08 -0400 |
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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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