From c9f6b6d881cb6ca230cb171c704ca4512d3cf95f Mon Sep 17 00:00:00 2001 From: Amelie Delaunay Date: Mon, 10 Aug 2020 09:12:36 +0200 Subject: [PATCH] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate 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 --- 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 e5450233f3f8b..571dea72bf7e6 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -441,7 +441,8 @@ 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 -- 2.39.5