On 07/23/2014 01:07 PM, Laurent Pinchart wrote: [...]
Let's start by answering the background question and updating the DMA engine API documentation once and for good : in which context are drivers allowed to call the prep, tx_submit and issue_pending functions ?
I think the expectation is that these functions can be called in any context. Maybe what's missing is a way to tell the DMA engine driver to get ready and that it is going to be used very soon. This could be done from the sound devices open() callback.
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