[PATCH 2/2] ASoC: SOF: ipc4-topology: Preserve the DMA Link ID for ChainDMA on unprepare

[Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>]

The DMA Link ID is set to the IPC message's primary during dai_config,
which is only during hw_params.
During xrun handling the hw_params is not called and the DMA Link ID
information will be lost.

All other fields in the message expected to be 0 for re-configuration, only
the DMA Link ID needs to be preserved and the in case of repeated
dai_config, it is correctly updated (masked and then set).

Cc: stable@xxxxxxxxxxxxxxx
Fixes: ca5ce0caa67f ("ASoC: SOF: ipc4/intel: Add support for chained DMA")
Link: https://github.com/thesofproject/linux/issues/5116
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
 sound/soc/sof/ipc4-topology.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index 4a4234d5c941..87be7f16e8c2 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -1358,7 +1358,13 @@ static void sof_ipc4_unprepare_copier_module(struct snd_sof_widget *swidget)
 		ipc4_copier = dai->private;
 
 		if (pipeline->use_chain_dma) {
-			pipeline->msg.primary = 0;
+			/*
+			 * Preserve the DMA Link ID and clear other bits since
+			 * the DMA Link ID is only configured once during
+			 * dai_config, other fields are expected to be 0 for
+			 * re-configuration
+			 */
+			pipeline->msg.primary &= SOF_IPC4_GLB_CHAIN_DMA_LINK_ID_MASK;
 			pipeline->msg.extension = 0;
 		}
 
-- 
2.45.2