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From:   Chunxu Li <chunxu.li@mediatek.com>
To:     <broonie@kernel.org>, <pierre-louis.bossart@linux.intel.com>,
        <peter.ujfalusi@linux.intel.com>, <lgirdwood@gmail.com>,
        <angelogioacchino.delregno@collabora.com>, <daniel.baluta@nxp.com>
CC:     <matthias.bgg@gmail.com>, <yc.hung@mediatek.com>,
        <linux-kernel@vger.kernel.org>, <alsa-devel@alsa-project.org>,
        <sound-open-firmware@alsa-project.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <project_global_chrome_upstream_group@mediatek.com>,
        Chunxu Li <chunxu.li@mediatek.com>
Subject: [PATCH] ASoC: SOF: mediatek: add pcm_pointer callback for mt8186
Date:   Wed, 21 Sep 2022 20:02:39 +0800
Message-ID: <20220921120239.31934-1-chunxu.li@mediatek.com>
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Precedence: bulk

add pcm_pointer callback for mt8186 to support read
host position from DSP

Signed-off-by: Chunxu Li <chunxu.li@mediatek.com>
---
 sound/soc/sof/mediatek/mt8186/mt8186.c | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/sound/soc/sof/mediatek/mt8186/mt8186.c b/sound/soc/sof/mediatek/mt8186/mt8186.c
index 9ec89fc7fec0..181189e00e02 100644
--- a/sound/soc/sof/mediatek/mt8186/mt8186.c
+++ b/sound/soc/sof/mediatek/mt8186/mt8186.c
@@ -470,6 +470,38 @@ static int mt8186_pcm_hw_params(struct snd_sof_dev *sdev,
 	return 0;
 }
 
+static snd_pcm_uframes_t mt8186_pcm_pointer(struct snd_sof_dev *sdev,
+					    struct snd_pcm_substream *substream)
+{
+	int ret;
+	snd_pcm_uframes_t pos;
+	struct snd_sof_pcm *spcm;
+	struct sof_ipc_stream_posn posn;
+	struct snd_sof_pcm_stream *stream;
+	struct snd_soc_component *scomp = sdev->component;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+
+	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->substream, &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;
+}
+
 static struct snd_soc_dai_driver mt8186_dai[] = {
 {
 	.name = "SOF_DL1",
@@ -537,6 +569,7 @@ static struct snd_sof_dsp_ops sof_mt8186_ops = {
 	/* stream callbacks */
 	.pcm_open	= sof_stream_pcm_open,
 	.pcm_hw_params	= mt8186_pcm_hw_params,
+	.pcm_pointer	= mt8186_pcm_pointer,
 	.pcm_close	= sof_stream_pcm_close,
 
 	/* firmware loading */
-- 
2.25.1