spi: stm32: fix Overrun issue at < 8bpw

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[ Upstream commit 1ac3be217c ]

When SPI communication is suspended by hardware automatically, it could
happen that few bits of next frame are already clocked out due to
internal synchronization delay.

To achieve a safe suspension, we need to ensure that each word must be
at least 8 SPI clock cycles long. That's why, if bpw is less than 8
bits, we need to use midi to reach 8 SPI clock cycles at least.

This will ensure that each word achieve safe suspension and prevent
overrun condition.

Signed-off-by: Deepak Kumar <deepak.kumar01@st.com>
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://patch.msgid.link/20251218-stm32-spi-enhancements-v2-2-3b69901ca9fe@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Deepak Kumar 2025-12-18 11:48:28 +01:00 • committed by Sasha Levin

parent a57f1024b9

commit 86ba653114

1 changed files with 5 additions and 4 deletions

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drivers/spi/spi-stm32.c

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