[PATCH] ASoC: SOF: ipc4-topology: Refresh copier IPC payload before widget setup

[PATCH] ASoC: SOF: ipc4-topology: Refresh copier IPC payload before widget setup

[Peter Ujfalusi]

The ipc_config_data buffer for copier widgets is built once during
ipc_prepare (called from sof_pcm_setup_connected_widgets) and cached
for reuse. For host copiers this buffer contains the copier_data with
gtw_cfg.node_id (host DMA ID). For DAI copiers it additionally includes
a dma_config_tlv trailer with stream_id and dma_channel_id for HDA link
DMA.

On suspend/resume, both host and link DMA streams are released and
re-allocated with potentially different stream tags. The underlying
copier_data and dma_config_tlv structures are correctly updated by
host_config and sdw_hda_dai_hw_params respectively. However, since the
widget list (spcm->stream[].list) persists across suspend,
sof_pcm_hw_params skips sof_pcm_setup_connected_widgets and ipc_prepare
never runs again to rebuild ipc_config_data. The stale cached payload
is then sent to firmware with boot-time DMA channel assignments, causing
DMA channel conflicts that lead to firmware errors and crashes.

Fix this by refreshing copier_data and dma_config_tlv portions of
ipc_config_data in sof_ipc4_widget_setup right before the IPC message
is sent. This ensures the payload always reflects the current DMA state
regardless of whether ipc_prepare ran.

For DAI copiers, the gtw_cfg.config_length in copier_data is temporarily
inflated to include the TLV size (matching the ipc_config_data layout)
before copying, then restored, mirroring what
sof_ipc4_prepare_copier_module does when first building the buffer.

Fixes: e9c6b118de1a ("ASoC: SOF: make dma_config_tlv be an array")
Cc: stable@vger.kernel.org
Link: https://github.com/thesofproject/sof/issues/10700
Link: https://github.com/thesofproject/sof/issues/10955
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
---
 sound/soc/sof/ipc4-topology.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index 1aba13a90973..fabd364d3316 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -2654,6 +2654,15 @@ static int sof_ipc4_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget
 		ipc_size = ipc4_copier->ipc_config_size;
 		ipc_data = ipc4_copier->ipc_config_data;
 
+		/*
+		 * Refresh copier_data in ipc_config_data for host copiers.
+		 * The node_id may have been updated by host_config after
+		 * ipc_prepare, e.g. when host stream tags change after a
+		 * suspend/resume cycle.
+		 */
+		if (swidget->id != snd_soc_dapm_buffer)
+			memcpy(ipc_data, &ipc4_copier->data, sizeof(ipc4_copier->data));
+
 		msg = &ipc4_copier->msg;
 		break;
 	}
@@ -2662,6 +2671,9 @@ static int sof_ipc4_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget
 	{
 		struct snd_sof_dai *dai = swidget->private;
 		struct sof_ipc4_copier *ipc4_copier = dai->private;
+		struct sof_ipc4_copier_data *copier_data;
+		u32 gtw_cfg_config_length;
+		u32 tlv_size;
 
 		pipeline = pipe_widget->private;
 		if (pipeline->use_chain_dma)
@@ -2670,6 +2682,27 @@ static int sof_ipc4_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget
 		ipc_size = ipc4_copier->ipc_config_size;
 		ipc_data = ipc4_copier->ipc_config_data;
 
+		/*
+		 * Refresh copier_data and dma_config_tlv in ipc_config_data.
+		 * These may have been updated after ipc_prepare, e.g. when
+		 * link DMA stream tags change after a suspend/resume cycle.
+		 *
+		 * copier_data->gtw_cfg.config_length does not include the
+		 * TLV size (it was restored after sof_ipc4_prepare_copier_module),
+		 * so temporarily inflate it to match the ipc_config_data layout.
+		 */
+		copier_data = &ipc4_copier->data;
+		gtw_cfg_config_length = copier_data->gtw_cfg.config_length * 4;
+		tlv_size = ipc_size - sizeof(*copier_data) - gtw_cfg_config_length;
+
+		copier_data->gtw_cfg.config_length += tlv_size / 4;
+		memcpy(ipc_data, copier_data, sizeof(*copier_data));
+		copier_data->gtw_cfg.config_length = gtw_cfg_config_length / 4;
+
+		if (tlv_size)
+			memcpy(ipc_data + sizeof(*copier_data) + gtw_cfg_config_length,
+			       &ipc4_copier->dma_config_tlv, tlv_size);
+
 		msg = &ipc4_copier->msg;
 		break;
 	}
-- 
2.55.0