[15/18] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate
diff mbox series

Message ID 1596610933-32599-16-git-send-email-alain.volmat@st.com
State New
Headers show
Series
  • spi: stm32: various driver enhancements
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Commit Message

Alain Volmat Aug. 5, 2020, 7:02 a.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(-)

Comments

Mark Brown Aug. 5, 2020, 11:02 a.m. UTC | #1
On Wed, Aug 05, 2020 at 09:02:10AM +0200, Alain Volmat wrote:
> 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.

This is a fix too.

Patch
diff mbox series

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 0aec32538093..2665d8d7f318 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -436,7 +436,8 @@  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