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| author | Brian Niebuhr <[email protected]> | 2010-03-09 22:48:03 +0000 |
|---|---|---|
| committer | Kevin Hilman <[email protected]> | 2010-04-05 22:25:11 +0000 |
| commit | bb17ef102b72e38557bfa829511e06c4bd3bb972 (patch) | |
| tree | e35ff2208685fdd619afbb4eba8b9e5fe1a34885 /tools/perf/scripts/python | |
| parent | davinci: da8xx/omap-l1: fix build error when CONFIG_DAVINCI_MUX is undefined (diff) | |
| download | kernel-bb17ef102b72e38557bfa829511e06c4bd3bb972.tar.gz kernel-bb17ef102b72e38557bfa829511e06c4bd3bb972.zip | |
davinci: edma: clear events in edma_start()
This patch fixes an issue where a DMA channel can erroneously process an
event generated by a previous transfer. A failure case is where DMA is
being used for SPI transmit and receive channels on OMAP L138. In this
case there is a single bit that controls all event generation from the
SPI peripheral. Therefore it is possible that between when edma_stop()
has been called for the transmit channel on a previous transfer and
edma_start() is called for the transmit channel on a subsequent transfer,
that a transmit event has been generated.
The fix is to clear events in edma_start(). This prevents false events
from being processed when events are enabled for that channel.
Signed-off-by: Brian Niebuhr <[email protected]>
Signed-off-by: Kevin Hilman <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions