spi: spi-fsl-spi: automatically adapt bits-per-word in cpu mode

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Taking one interrupt for every byte is rather slow. Since the
controller is perfectly capable of transmitting 32 bits at a time,
change t->bits_per-word to 32 when the length is divisible by 4 and
large enough that the reduced number of interrupts easily compensates
for the one or two extra fsl_spi_setup_transfer() calls this causes.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Rasmus Villemoes 2019-03-27 14:30:52 +00:00 • committed by Mark Brown

parent a798a7086c

commit af0e624290

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drivers/spi/spi-fsl-spi.c

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