ASoC: SOF: ipc4: store number of playback/capture streams

The CHAIN_DMA IPC needs the number of playback streams as a start
offset for the dma_id of a capture stream.

This offset can be retrieved on Intel platforms from the GCAP
information, and stored in the sof_ipc4_fw_data structure.

One could argue that the fields added are not really dependent on any
firmware definitions but rather on hardware capabilities, but they are
required for the IPC CHAIN_DMA definitions so adding them in
ipc4_fw_data isn't completely silly.

The CHAIN_DMA IPC is currently only functional on Intel HDaudio DMAs,
and gated by the snd_sof_is_chain_dma_supported() helper.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://msgid.link/r/20240213101247.28887-6-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/hda-stream.c

@@ -21,6 +21,7 @@
 #include <trace/events/sof_intel.h>
 #include "../ops.h"
 #include "../sof-audio.h"
+#include "../ipc4-priv.h"
 #include "hda.h"
 
 #define HDA_LTRP_GB_VALUE_US	95
@@ -937,6 +938,14 @@ int hda_dsp_stream_init(struct snd_sof_dev *sdev)
 	/* store total stream count (playback + capture) from GCAP */
 	sof_hda->stream_max = num_total;
 
+	/* store stream count from GCAP required for CHAIN_DMA */
+	if (sdev->pdata->ipc_type == SOF_IPC_TYPE_4) {
+		struct sof_ipc4_fw_data *ipc4_data = sdev->private;
+
+		ipc4_data->num_playback_streams = num_playback;
+		ipc4_data->num_capture_streams = num_capture;
+	}
+
 	return 0;
 }
 

sound/soc/sof/ipc4-priv.h

@@ -66,6 +66,8 @@ struct sof_ipc4_fw_library {
  * @nhlt: NHLT table either from the BIOS or the topology manifest
  * @mtrace_type: mtrace type supported on the booted platform
  * @mtrace_log_bytes: log bytes as reported by the firmware via fw_config reply
+ * @num_playback_streams: max number of playback DMAs, needed for CHAIN_DMA offset
+ * @num_capture_streams: max number of capture DMAs
  * @max_num_pipelines: max number of pipelines
  * @max_libs_count: Maximum number of libraries support by the FW including the
  *		    base firmware
@@ -79,6 +81,8 @@ struct sof_ipc4_fw_data {
 	void *nhlt;
 	enum sof_ipc4_mtrace_type mtrace_type;
 	u32 mtrace_log_bytes;
+	int num_playback_streams;
+	int num_capture_streams;
 	int max_num_pipelines;
 	u32 max_libs_count;
 	bool fw_context_save;