#qi-hardware IRC log for Sunday, 2014-06-29

apeletelarsc: I've been playing with preparing next data while dma is transfering current data21:50
apeletewrote a first version where I had jz4740_pre_request() and jz4740_post_request() callbacks, with jz4740_pre_request() relying on jz4740_pre_dma_transfer() function which only do dma_map_sg() while dma is trasnfering data21:52
apeletedidn't noticed any improvement so I tried doing dma_map_sg() + dmaengine_slave_config() + dmaengine_prep_slave_sg() all together in parallel21:55
apeletethat last combination doesn't work yet, here's the patch I'm working on if you care to take a look;21:56
apeletehttp://paste.debian.net/107332/21:56
apeleteI'm getting a kernel panic which comes from dmaengine_submit(desc); in jz4740_send_dma_request()21:59
apeletelarsc: is it possible at all to do dmaengine_slave_config() + dmaengine_prep_slave_sg() in parallel ?22:00
apeleteparallel = while dma is busy trasnferring current data22:01
--- Mon Jun 30 201400:00

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