ASoC: SOF: amd: Add pcm pointer callback for amd platforms.

Add pcm pointer callback for amd platforms to read host position
update from stream box.
Signed-off-by: V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>
Link: https://lore.kernel.org/r/20230308084509.1496256-2-Vsujithkumar.Reddy@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/amd/acp-common.c

@@ -187,6 +187,7 @@ struct snd_sof_dsp_ops sof_acp_common_ops = {
 	.pcm_open		= acp_pcm_open,
 	.pcm_close		= acp_pcm_close,
 	.pcm_hw_params		= acp_pcm_hw_params,
+	.pcm_pointer		= acp_pcm_pointer,
 
 	.hw_info		= SNDRV_PCM_INFO_MMAP |
 				  SNDRV_PCM_INFO_MMAP_VALID |

sound/soc/sof/amd/acp-pcm.c

@@ -84,3 +84,36 @@ int acp_pcm_close(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream)
 	return acp_dsp_stream_put(sdev, stream);
 }
 EXPORT_SYMBOL_NS(acp_pcm_close, SND_SOC_SOF_AMD_COMMON);
+
+snd_pcm_uframes_t acp_pcm_pointer(struct snd_sof_dev *sdev,
+				  struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_component *scomp = sdev->component;
+	struct snd_sof_pcm_stream *stream;
+	struct sof_ipc_stream_posn posn;
+	struct snd_sof_pcm *spcm;
+	snd_pcm_uframes_t pos;
+	int ret;
+
+	spcm = snd_sof_find_spcm_dai(scomp, rtd);
+	if (!spcm) {
+		dev_warn_ratelimited(sdev->dev, "warn: can't find PCM with DAI ID %d\n",
+				     rtd->dai_link->id);
+		return 0;
+	}
+
+	stream = &spcm->stream[substream->stream];
+	ret = snd_sof_ipc_msg_data(sdev, stream, &posn, sizeof(posn));
+	if (ret < 0) {
+		dev_warn(sdev->dev, "failed to read stream position: %d\n", ret);
+		return 0;
+	}
+
+	memcpy(&stream->posn, &posn, sizeof(posn));
+	pos = spcm->stream[substream->stream].posn.host_posn;
+	pos = bytes_to_frames(substream->runtime, pos);
+
+	return pos;
+}
+EXPORT_SYMBOL_NS(acp_pcm_pointer, SND_SOC_SOF_AMD_COMMON);

sound/soc/sof/amd/acp.h

@@ -238,6 +238,8 @@ int acp_pcm_close(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream)
 int acp_pcm_hw_params(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream,
 		      struct snd_pcm_hw_params *params,
 		      struct snd_sof_platform_stream_params *platform_params);
+snd_pcm_uframes_t acp_pcm_pointer(struct snd_sof_dev *sdev,
+				  struct snd_pcm_substream *substream);
 
 extern struct snd_sof_dsp_ops sof_acp_common_ops;