[PATCH 3/5] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate

[Alain Volmat]

From: Amelie Delaunay <amelie.delau...@st.com>

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.delau...@st.com>
Signed-off-by: Alain Volmat <alain.vol...@st.com>
---
 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 005bc16bdf2a..bdd4e70c3f10 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
-- 
2.7.4