Commit 2844685c authored Aug 10, 2020 by Amelie Delaunay Committed by Greg Kroah-Hartman Sep 03, 2020

spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate



[ 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>

parent a6daa863

drivers/spi/spi-stm32.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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