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(parent: 4fbd8d1) | patch
spi: a3700: Clear DATA_OUT when performing a read
authorMaxime Chevallier <maxime.chevallier@smile.fr>
Wed, 17 Jan 2018 16:15:25 +0000 (17:15 +0100)
committerMark Brown <broonie@kernel.org>
Thu, 18 Jan 2018 10:59:12 +0000 (10:59 +0000)
commit44a5f423e70374e5b42cecd85e78f2d79334e0f2
treeac17c518f5357f051350af2833675af9cb913182tree | snapshot
parent4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323commit | diff
spi: a3700: Clear DATA_OUT when performing a read

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>
drivers/spi/spi-armada-3700.c diff | blob | history
Domain: System / Kernel;