Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 72c7b67a authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Vinod Koul
Browse files

dmaengine: edma: Add support for DMA_PAUSE/RESUME operation 



Pause/Resume can be used by the audio stack when the stream is paused/resumed
The edma platform code has support for this and the legacy audio stack used
this.

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: default avatarJoel Fernandes <joelf@ti.com>
Reviewed-and-Tested-by: default avatarJoel Fernandes <joelf@ti.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent b2b617de

drivers/dma/edma.c

+28 −0
Original line number Diff line number Diff line
@@ -242,6 +242,26 @@ static int edma_slave_config(struct edma_chan *echan, 
	return 0;

}



static int edma_dma_pause(struct edma_chan *echan)

{

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

	if (!echan->edesc->cyclic)

		return -EINVAL;



	edma_pause(echan->ch_num);

	return 0;

}



static int edma_dma_resume(struct edma_chan *echan)

{

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

	if (!echan->edesc->cyclic)

		return -EINVAL;



	edma_resume(echan->ch_num);

	return 0;

}



static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,

			unsigned long arg)

{
@@ -257,6 +277,14 @@ static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, 
		config = (struct dma_slave_config *)arg;

		ret = edma_slave_config(echan, config);

		break;

	case DMA_PAUSE:

		ret = edma_dma_pause(echan);

		break;



	case DMA_RESUME:

		ret = edma_dma_resume(echan);

		break;



	default:

		ret = -ENOSYS;

	}