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spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate 

[ Upstream commit 9cc61973bf ]

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>
This commit is contained in:
Amelie Delaunay 2020-08-10 09:12:36 +02:00 committed by Greg Kroah-Hartman
parent a6daa863d1
commit 2844685c66
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi-stm32.c
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@ -443,7 +443,8 @@ 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