spi: stm32-qspi: add automatic poll status feature

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STM32 QSPI is able to automatically poll a specified register inside the
memory and relieve the CPU from this task.

As example, when erasing a large memory area, we got cpu load
equal to 50%. This patch allows to perform the same operation
with a cpu load around 2%.

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20210518162754.15940-4-patrice.chotard@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Patrice Chotard 2021-05-18 18:27:54 +02:00 • committed by Mark Brown

parent 8941cd8d29

commit 86d1c6bbae

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drivers/spi/spi-stm32-qspi.c

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