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

Message ID 1596806485-3810-4-git-send-email-alain.volmat@st.com
State New, archived
Headers show
Series spi: stm32: various driver fixes | expand

Commit Message

Alain Volmat Aug. 7, 2020, 1:21 p.m. UTC
From: Amelie Delaunay <amelie.delaunay@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.delaunay@st.com>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
---
 drivers/spi/spi-stm32.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

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