Re: [alsa-devel] [PATCH] ASoC: s3c24xx platform: Fix s3c2410_dma_started called at wrong time

The callback doesn't need to be set up within the trigger function - if it's done before the trigger functions are called then the DMA trigger can call it. Off the top of my head I'd expect it's possible to set it up when the device is opened.

Who call the DMA trigger? When? In any of the platform/cpu_dai trigger functions?