[alsa-devel] [PATCH 1/2] dma: Add a PAUSE_RESUME capability

[Lars-Peter Clausen]

Add a capability which allows dmaengine consumers to query whether a dmaengine
controller supports the DMA_PAUSE and DMA_RESUME commands. Sometimes a user of
the dmaengine API needs to know in advance if a channel will support
pause/resume. E.g. in ALSA the information whether it is possible to
pause/resume a audio stream or whether it is necessary to abort and restart the
stream is communicated to userspace so it can act accordingly.

Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
---
 include/linux/dmaengine.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 96d3e4a..ad98dfb 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -74,6 +74,7 @@ enum dma_transaction_type {
 	DMA_SLAVE,
 	DMA_CYCLIC,
 	DMA_INTERLEAVE,
+	DMA_PAUSE_RESUME,
 /* last transaction type for creation of the capabilities mask */
 	DMA_TX_TYPE_END,
 };
-- 
1.8.0