Re: [alsa-devel] [PATCH v3 02/15] dmaengine: omap: Add support for pause/resume in cyclic dma mode

On Mon, Sep 17, 2012 at 08:43:57AM +0530, Vinod Koul wrote:

On Fri, 2012-09-14 at 15:05 +0300, Peter Ujfalusi wrote:

...

•   /* FIXME: not supported by platform private API */
  

•   return -EINVAL;
  

•   /* Pause/Resume only allowed with cyclic mode */
  

•   if (!c->cyclic)
  

•           return -EINVAL; 
  

This is not a dma restriction right?

This is needed because this is not a real "pause" - it is a stop, which causes the contents of the DMA engine's FIFOs to be discarded - which means a subsequent resume will loose data.