spi: a3700: Clear DATA_OUT when performing a read

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When performing a read using FIFO mode, the spi controller shifts out
the last 2 bytes that were written in a previous transfer on MOSI.

This undocumented behaviour can cause devices to misinterpret the
transfer, so we explicitly clear the WFIFO before each read.

This behaviour was noticed on EspressoBin.

Signed-off-by: Maxime Chevallier <maxime.chevallier@smile.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Maxime Chevallier 2018-01-17 17:15:25 +01:00 • committed by Mark Brown

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commit 44a5f423e7

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drivers/spi/spi-armada-3700.c

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