linux-kernel - [PATCH 1/2] ASoC: SOF: amd: Add pcm pointer callback for amd platforms.

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Date:   Wed, 8 Mar 2023 14:15:08 +0530
From:   V sujith kumar Reddy <Vsujithkumar.Reddy@....com>
To:     <broonie@...nel.org>, <alsa-devel@...a-project.org>
CC:     <Vijendar.Mukunda@....com>, <Basavaraj.Hiregoudar@....com>,
        <Sunil-kumar.Dommati@....com>, <ajitkumar.pandey@....com>,
        "V sujith kumar Reddy" <Vsujithkumar.Reddy@....com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Ajit Kumar Pandey" <AjitKumar.Pandey@....com>,
        Rander Wang <rander.wang@...el.com>,
        "moderated list:SOUND - SOUND OPEN FIRMWARE (SOF) DRIVERS" 
        <sound-open-firmware@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] 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@....com>
---
 sound/soc/sof/amd/acp-common.c |  1 +
 sound/soc/sof/amd/acp-pcm.c    | 33 +++++++++++++++++++++++++++++++++
 sound/soc/sof/amd/acp.h        |  2 ++
 3 files changed, 36 insertions(+)

diff --git a/sound/soc/sof/amd/acp-common.c b/sound/soc/sof/amd/acp-common.c
index bd6c1b198736..8ce4c8956933 100644
--- a/sound/soc/sof/amd/acp-common.c
+++ b/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 |
diff --git a/sound/soc/sof/amd/acp-pcm.c b/sound/soc/sof/amd/acp-pcm.c
index 727c3a784a20..f342f0bac4a3 100644
--- a/sound/soc/sof/amd/acp-pcm.c
+++ b/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);
diff --git a/sound/soc/sof/amd/acp.h b/sound/soc/sof/amd/acp.h
index 39165ebf684b..acad57947616 100644
--- a/sound/soc/sof/amd/acp.h
+++ b/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;
 
-- 
2.25.1