On Fri, 2012-04-27 at 16:41 +0800, Richard Zhao wrote: > On Fri, Apr 27, 2012 at 01:51:40PM +0530, Vinod Koul wrote: > > On Fri, 2012-04-27 at 15:02 +0800, Richard Zhao wrote: > > > device_prep_dma_cyclic may be call in audio trigger function which is > > > atomic context, so we make it atomic too. > > No this is wrong behavior. You should not call dma prepare functions in > > any of the sound trigger calls. It would make sense to move this in > > sound prepare callback. > Then, could you please doc it somewhere? I think I'm not the only one > confused. See the soc-dmaengine.c for correct behavior! I can document only dmaengine behavior (which is already there) and not how each subsystem should use this. People is subsystems need to see how to use the dmaengine APIs sanely
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