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Commit 72c7b67a authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Vinod Koul
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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
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+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;
	}