[PATCH v2 3/5] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate
From: Alain Volmat <hidden>
Date: 2020-08-10 07:13:08
Also in:
linux-spi, lkml
Subsystem:
spi subsystem, st stm32 spi driver, the rest · Maintainers:
Mark Brown, Alain Volmat, Linus Torvalds
From: Amelie Delaunay <redacted> 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 <redacted> Signed-off-by: Alain Volmat <redacted> --- v2: identical to v1 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 e5450233f3f8..571dea72bf7e 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
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