From: Brian Niebuhr Date: Tue, 9 Mar 2010 22:48:03 +0000 (-0600) Subject: davinci: edma: clear events in edma_start() X-Git-Tag: v2.6.34-rc4~26^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb17ef102b72e38557bfa829511e06c4bd3bb972;p=pandora-kernel.git 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 Signed-off-by: Kevin Hilman --- Reading git-diff-tree failed