linux-kernel - [PATCH 2/2] ASoC: SOF: mediatek: mt8195: Add pcm

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Date:   Sat, 24 Sep 2022 11:35:59 +0800
From:   Chunxu Li <chunxu.li@...iatek.com>
To:     <broonie@...nel.org>, <pierre-louis.bossart@...ux.intel.com>,
        <peter.ujfalusi@...ux.intel.com>, <lgirdwood@...il.com>,
        <angelogioacchino.delregno@...labora.com>, <daniel.baluta@....com>
CC:     <matthias.bgg@...il.com>, <yc.hung@...iatek.com>,
        <linux-kernel@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <sound-open-firmware@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <project_global_chrome_upstream_group@...iatek.com>,
        Chunxu Li <chunxu.li@...iatek.com>
Subject: [PATCH 2/2] ASoC: SOF: mediatek: mt8195: Add pcm_pointer callback

Add pcm_pointer callback for mt8195 to support read
host position from DSP

Signed-off-by: Chunxu Li <chunxu.li@...iatek.com>
---
 sound/soc/sof/mediatek/mt8195/mt8195.c | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/sound/soc/sof/mediatek/mt8195/mt8195.c b/sound/soc/sof/mediatek/mt8195/mt8195.c
index 882fde741cf5..3c81e84fcecf 100644
--- a/sound/soc/sof/mediatek/mt8195/mt8195.c
+++ b/sound/soc/sof/mediatek/mt8195/mt8195.c
@@ -506,6 +506,38 @@ static int mt8195_pcm_hw_params(struct snd_sof_dev *sdev,
 	return 0;
 }
 
+static snd_pcm_uframes_t mt8195_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 void mt8195_adsp_dump(struct snd_sof_dev *sdev, u32 flags)
 {
 	u32 dbg_pc, dbg_data, dbg_bus0, dbg_bus1, dbg_inst;
@@ -599,6 +631,7 @@ static struct snd_sof_dsp_ops sof_mt8195_ops = {
 	/* stream callbacks */
 	.pcm_open	= sof_stream_pcm_open,
 	.pcm_hw_params	= mt8195_pcm_hw_params,
+	.pcm_pointer	= mt8195_pcm_pointer,
 	.pcm_close	= sof_stream_pcm_close,
 
 	/* firmware loading */
-- 
2.25.1