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| author | Esben Haabendal <eha@deif.com> | 2018-08-16 10:43:12 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2018-08-20 11:13:09 +0200 |
| commit | bed4ff1ed4d8f2ef5007c5c6ae1b29c5677a3632 (patch) | |
| tree | 62e0e8b251ca36d6eadee3df8013e36962b23a37 /tools/perf/scripts/python | |
| parent | i2c: pasemi: remove hardcoded bus numbers on smbus (diff) | |
| download | linux-bed4ff1ed4d8f2ef5007c5c6ae1b29c5677a3632.tar.gz linux-bed4ff1ed4d8f2ef5007c5c6ae1b29c5677a3632.zip | |
i2c: imx: Fix race condition in dma read
This fixes a race condition, where the DMAEN bit ends up being set after
I2C slave has transmitted a byte following the dummy read. When that
happens, an interrupt is generated instead, and no DMA request is generated
to kickstart the DMA read, and a timeout happens after DMA_TIMEOUT (1 sec).
Fixed by setting the DMAEN bit before the dummy read.
Signed-off-by: Esben Haabendal <eha@deif.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions