From: Amelie Delaunay Date: Mon, 10 Aug 2020 07:12:36 +0000 (+0200) Subject: spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate X-Git-Tag: v5.8.6~134 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=accab06770476221101e781925ae1d9c5260d495;p=thirdparty%2Fkernel%2Fstable.git 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 Signed-off-by: Alain Volmat Link: https://lore.kernel.org/r/1597043558-29668-4-git-send-email-alain.volmat@st.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 7f2113e7b3ddc..9b90a22543fd7 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