spi: uniphier: introduce polling mode

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Introduce new polling mode for short size transfer. Either the estimated
transfer time is estimated to exceed 200us, or polling loop actually exceeds
200us, it switches to irq mode.

Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>
Link: https://lore.kernel.org/r/1567488661-11428-4-git-send-email-hayashibara.keiji@socionext.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Keiji Hayashibara 2019-09-03 14:31:01 +09:00 • committed by Mark Brown

parent 151d0eafa4

commit 37ffab8170

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1 changed files with 66 additions and 15 deletions

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drivers/spi/spi-uniphier.c

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