Enable timestamp support for SOF compress driver

Merge series from Daniel Baluta <[e-mail]>:

This patchseries computes pcm_io_frames from the DAI position reported
by SOF firmware. Using pcm_io_frames userspace applications can later
compute timestamps for compressed stream.

sound/soc/sof/compress.c

···
 #include "sof-priv.h"
 #include "sof-utils.h"
 
-static void sof_set_transferred_bytes(struct snd_compr_tstamp *tstamp,
+static void sof_set_transferred_bytes(struct sof_compr_stream *sstream,
 				      u64 host_pos, u64 buffer_size)
 {
 	u64 prev_pos;
 	unsigned int copied;
 
-	div64_u64_rem(tstamp->copied_total, buffer_size, &prev_pos);
+	div64_u64_rem(sstream->copied_total, buffer_size, &prev_pos);
 
 	if (host_pos < prev_pos)
 		copied = (buffer_size - prev_pos) + host_pos;
 	else
 		copied = host_pos - prev_pos;
 
-	tstamp->copied_total += copied;
+	sstream->copied_total += copied;
 }
 
 static void snd_sof_compr_fragment_elapsed_work(struct work_struct *work)
···
 	struct snd_soc_pcm_runtime *rtd;
 	struct snd_compr_runtime *crtd;
 	struct snd_soc_component *component;
-	struct snd_compr_tstamp *tstamp;
+	struct sof_compr_stream *sstream;
 	struct snd_sof_pcm *spcm;
 
 	if (!cstream)
···
 
 	rtd = cstream->private_data;
 	crtd = cstream->runtime;
-	tstamp = crtd->private_data;
+	sstream = crtd->private_data;
 	component = snd_soc_rtdcom_lookup(rtd, SOF_AUDIO_PCM_DRV_NAME);
 
 	spcm = snd_sof_find_spcm_dai(component, rtd);
···
 		return;
 	}
 
-	sof_set_transferred_bytes(tstamp, spcm->stream[cstream->direction].posn.host_posn,
+	sof_set_transferred_bytes(sstream, spcm->stream[cstream->direction].posn.host_posn,
 				  crtd->buffer_size);
 
 	/* use the same workqueue-based solution as for PCM, cf. snd_sof_pcm_elapsed */
···
 {
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_compr_runtime *crtd = cstream->runtime;
-	struct snd_compr_tstamp *tstamp;
+	struct sof_compr_stream *sstream;
 	struct snd_sof_pcm *spcm;
 	int dir;
 
-	tstamp = kzalloc(sizeof(*tstamp), GFP_KERNEL);
-	if (!tstamp)
+	sstream = kzalloc(sizeof(*sstream), GFP_KERNEL);
+	if (!sstream)
 		return -ENOMEM;
 
 	spcm = snd_sof_find_spcm_dai(component, rtd);
 	if (!spcm) {
-		kfree(tstamp);
+		kfree(sstream);
 		return -EINVAL;
 	}
 
 	dir = cstream->direction;
 
 	if (spcm->stream[dir].cstream) {
-		kfree(tstamp);
+		kfree(sstream);
 		return -EBUSY;
 	}
 
···
 	spcm->stream[dir].posn.dai_posn = 0;
 	spcm->prepared[dir] = false;
 
-	crtd->private_data = tstamp;
+	crtd->private_data = sstream;
 
 	return 0;
 }
···
 			  struct snd_compr_stream *cstream)
 {
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
-	struct snd_compr_tstamp *tstamp = cstream->runtime->private_data;
+	struct sof_compr_stream *sstream = cstream->runtime->private_data;
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct sof_ipc_stream stream;
 	struct sof_ipc_reply reply;
···
 
 	cancel_work_sync(&spcm->stream[cstream->direction].period_elapsed_work);
 	spcm->stream[cstream->direction].cstream = NULL;
-	kfree(tstamp);
+	kfree(sstream);
 
 	return ret;
 }
···
 	struct sof_ipc_pcm_params_reply ipc_params_reply;
 	struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
 	struct sof_ipc_fw_version *v = &ready->version;
-	struct snd_compr_tstamp *tstamp;
+	struct sof_compr_stream *sstream;
 	struct sof_ipc_pcm_params *pcm;
 	struct snd_sof_pcm *spcm;
 	size_t ext_data_size;
···
 		return -EINVAL;
 	}
 
-	tstamp = crtd->private_data;
+	sstream = crtd->private_data;
 
 	spcm = snd_sof_find_spcm_dai(component, rtd);
 
···
 		goto out;
 	}
 
-	tstamp->byte_offset = sdev->stream_box.offset + ipc_params_reply.posn_offset;
-	tstamp->sampling_rate = params->codec.sample_rate;
+	sstream->sampling_rate = params->codec.sample_rate;
+	sstream->channels = params->codec.ch_out;
+	sstream->sample_container_bytes = pcm->params.sample_container_bytes;
 
 	spcm->prepared[cstream->direction] = true;
 
···
 			     struct snd_compr_stream *cstream,
 			     struct snd_compr_tstamp *tstamp)
 {
-	struct snd_compr_tstamp *pstamp = cstream->runtime->private_data;
+	u64 dai_posn;
+	struct snd_sof_pcm *spcm;
+	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+	struct sof_compr_stream *sstream = cstream->runtime->private_data;
 
-	tstamp->sampling_rate = pstamp->sampling_rate;
-	tstamp->copied_total = pstamp->copied_total;
+	spcm = snd_sof_find_spcm_dai(component, rtd);
+	if (!spcm)
+		return -EINVAL;
+
+	dai_posn = spcm->stream[cstream->direction].posn.dai_posn;
+
+	tstamp->sampling_rate = sstream->sampling_rate;
+	tstamp->copied_total = sstream->copied_total;
+	tstamp->pcm_io_frames = div_u64(spcm->stream[cstream->direction].posn.dai_posn,
+					sstream->channels * sstream->sample_container_bytes);
 
 	return 0;
 }

sound/soc/sof/sof-priv.h

···
 	SOF_DEBUGFS_ACCESS_D0_ONLY,
 };
 
+struct sof_compr_stream {
+	u64 copied_total;
+	u32 sampling_rate;
+	u16 channels;
+	u16 sample_container_bytes;
+};
+
 struct snd_sof_dev;
 struct snd_sof_ipc_msg;
 struct snd_sof_ipc;