ASoC: SOF: Add support for compress API for stream data/offset

snd_sof_pcm_stream keeps information about both PCM (snd_pcm_substream)
and Compress (snd_compr_stream) streams.

When PCM substream pointer is NULL this means we are dealing with a
compress stream.

Reviewed-by: Paul Olaru <[e-mail]>
Reviewed-by: Iuliana Prodan <[e-mail]>
Reviewed-by: Ranjani Sridharan <[e-mail]>
Reviewed-by: Peter Ujfalusi <[e-mail]>
Signed-off-by: Daniel Baluta <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/sof/sof-priv.h

···
 	u32 sampling_rate;
 	u16 channels;
 	u16 sample_container_bytes;
+	size_t posn_offset;
 };
 
 struct snd_sof_dev;

sound/soc/sof/stream-ipc.c

···
 	if (!sps || !sdev->stream_box.size) {
 		snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
 	} else {
-		struct snd_pcm_substream *substream = sps->substream;
-		struct sof_stream *stream = substream->runtime->private_data;
+		size_t posn_offset;
 
-		/* The stream might already be closed */
-		if (!stream)
-			return -ESTRPIPE;
+		if (sps->substream) {
+			struct sof_stream *stream = sps->substream->runtime->private_data;
 
-		snd_sof_dsp_mailbox_read(sdev, stream->posn_offset, p, sz);
+			/* The stream might already be closed */
+			if (!stream)
+				return -ESTRPIPE;
+
+			posn_offset = stream->posn_offset;
+		} else {
+
+			struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
+
+			if (!sstream)
+				return -ESTRPIPE;
+
+			posn_offset = sstream->posn_offset;
+		}
+
+		snd_sof_dsp_mailbox_read(sdev, posn_offset, p, sz);
 	}
 
 	return 0;
···
 			       struct snd_sof_pcm_stream *sps,
 			       size_t posn_offset)
 {
-	struct snd_pcm_substream *substream = sps->substream;
-	struct sof_stream *stream = substream->runtime->private_data;
-
 	/* check if offset is overflow or it is not aligned */
 	if (posn_offset > sdev->stream_box.size ||
 	    posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
 		return -EINVAL;
 
-	stream->posn_offset = sdev->stream_box.offset + posn_offset;
+	posn_offset += sdev->stream_box.offset;
 
-	dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
-		substream->stream, stream->posn_offset);
+	if (sps->substream) {
+		struct sof_stream *stream = sps->substream->runtime->private_data;
+
+		stream->posn_offset = posn_offset;
+		dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
+			sps->substream->stream, posn_offset);
+	} else if (sps->cstream) {
+		struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
+
+		sstream->posn_offset = posn_offset;
+		dev_dbg(sdev->dev, "compr: stream dir %d, posn mailbox offset is %zu",
+			sps->cstream->direction, posn_offset);
+	} else {
+		dev_err(sdev->dev, "No stream opened");
+		return -EINVAL;
+	}
 
 	return 0;
 }