spi: stm32: perform small transfer in polling mode

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In case of interrupt based transfer, when the transfer is very
small, relying on interrupts leads to lower performances than if
the transfer were done using polling on the registers.

Add a module parameter "polling_limit_us" to indicate the threshold
in us from which a transfer would be done polling the registers rather
than relying on interrupts.

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

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Alain Volmat 2025-12-18 11:48:29 +01:00 • committed by Mark Brown

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drivers/spi/spi-stm32.c

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