diff options
| author | Brian Niebuhr <bniebuhr3@gmail.com> | 2010-03-09 17:48:03 -0500 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-04-05 18:25:11 -0400 |
| commit | bb17ef102b72e38557bfa829511e06c4bd3bb972 (patch) | |
| tree | e35ff2208685fdd619afbb4eba8b9e5fe1a34885 /arch/xtensa/boot | |
| parent | 5eb2e891f038c8e04757f4536b9693faf35978a3 (diff) | |
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 <bniebuhr@efjohnson.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/xtensa/boot')
0 files changed, 0 insertions, 0 deletions