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| author |   Maxime Chevallier <maxime.chevallier@smile.fr> | 2018-01-17 17:15:25 +0100 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2018-01-18 10:59:12 +0000 |
| commit | 44a5f423e70374e5b42cecd85e78f2d79334e0f2 (patch) | |
| tree | ac17c518f5357f051350af2833675af9cb913182 /tools/perf/scripts/python/call-graph-from-sql.py | |
| parent | Linux 4.15-rc1 (diff) | |
| download | linux-dev-44a5f423e70374e5b42cecd85e78f2d79334e0f2.tar.xz linux-dev-44a5f423e70374e5b42cecd85e78f2d79334e0f2.zip | |
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>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-sql.py')
0 files changed, 0 insertions, 0 deletions