sound/soc/sof/intel/hda-dai.c - linux - Git at Google

 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 //
 // This file is provided under a dual BSD/GPLv2 license.  When using or
 // redistributing this file, you may do so under either license.
 //
 // Copyright(c) 2018 Intel Corporation. All rights reserved.
 //
 // Authors: Keyon Jie <yang.jie@linux.intel.com>
 //

 #include <sound/pcm_params.h>
 #include <sound/hdaudio_ext.h>
 #include "../sof-priv.h"
 #include "hda.h"

 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)

 struct hda_pipe_params {
 	u8 host_dma_id;
 	u8 link_dma_id;
 	u32 ch;
 	u32 s_freq;
 	u32 s_fmt;
 	u8 linktype;
 	snd_pcm_format_t format;
 	int link_index;
 	int stream;
 	unsigned int host_bps;
 	unsigned int link_bps;
 };

 /*
  * This function checks if the host dma channel corresponding
  * to the link DMA stream_tag argument is assigned to one
  * of the FEs connected to the BE DAI.
  */
 static bool hda_check_fes(struct snd_soc_pcm_runtime *rtd,
 			  int dir, int stream_tag)
 {
 	struct snd_pcm_substream *fe_substream;
 	struct hdac_stream *fe_hstream;
 	struct snd_soc_dpcm *dpcm;

 	for_each_dpcm_fe(rtd, dir, dpcm) {
 		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, dir);
 		fe_hstream = fe_substream->runtime->private_data;
 		if (fe_hstream->stream_tag == stream_tag)
 			return true;
 	}

 	return false;
 }

 static struct hdac_ext_stream *
 	hda_link_stream_assign(struct hdac_bus *bus,
 			       struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct sof_intel_hda_stream *hda_stream;
 	struct hdac_ext_stream *res = NULL;
 	struct hdac_stream *stream = NULL;

 	int stream_dir = substream->stream;

 	if (!bus->ppcap) {
 		dev_err(bus->dev, "stream type not supported\n");
 		return NULL;
 	}

 	list_for_each_entry(stream, &bus->stream_list, list) {
 		struct hdac_ext_stream *hstream =
 			stream_to_hdac_ext_stream(stream);
 		if (stream->direction != substream->stream)
 			continue;

 		hda_stream = hstream_to_sof_hda_stream(hstream);

 		/* check if link is available */
 		if (!hstream->link_locked) {
 			if (stream->opened) {
 				/*
 				 * check if the stream tag matches the stream
 				 * tag of one of the connected FEs
 				 */
 				if (hda_check_fes(rtd, stream_dir,
 						  stream->stream_tag)) {
 					res = hstream;
 					break;
 				}
 			} else {
 				res = hstream;

 				/*
 				 * This must be a hostless stream.
 				 * So reserve the host DMA channel.
 				 */
 				hda_stream->host_reserved = 1;
 				break;
 			}
 		}
 	}

 	if (res) {
 		/*
 		 * Decouple host and link DMA. The decoupled flag
 		 * is updated in snd_hdac_ext_stream_decouple().
 		 */
 		if (!res->decoupled)
 			snd_hdac_ext_stream_decouple(bus, res, true);
 		spin_lock_irq(&bus->reg_lock);
 		res->link_locked = 1;
 		res->link_substream = substream;
 		spin_unlock_irq(&bus->reg_lock);
 	}

 	return res;
 }

 static int hda_link_dma_params(struct hdac_ext_stream *stream,
 			       struct hda_pipe_params *params)
 {
 	struct hdac_stream *hstream = &stream->hstream;
 	unsigned char stream_tag = hstream->stream_tag;
 	struct hdac_bus *bus = hstream->bus;
 	struct hdac_ext_link *link;
 	unsigned int format_val;

 	snd_hdac_ext_stream_decouple(bus, stream, true);
 	snd_hdac_ext_link_stream_reset(stream);

 	format_val = snd_hdac_calc_stream_format(params->s_freq, params->ch,
 						 params->format,
 						 params->link_bps, 0);

 	dev_dbg(bus->dev, "format_val=%d, rate=%d, ch=%d, format=%d\n",
 		format_val, params->s_freq, params->ch, params->format);

 	snd_hdac_ext_link_stream_setup(stream, format_val);

 	if (stream->hstream.direction == SNDRV_PCM_STREAM_PLAYBACK) {
 		list_for_each_entry(link, &bus->hlink_list, list) {
 			if (link->index == params->link_index)
 				snd_hdac_ext_link_set_stream_id(link,
 								stream_tag);
 		}
 	}

 	stream->link_prepared = 1;

 	return 0;
 }

 /* Send DAI_CONFIG IPC to the DAI that matches the dai_name and direction */
 static int hda_link_config_ipc(struct sof_intel_hda_stream *hda_stream,
 			       const char *dai_name, int channel, int dir)
 {
 	struct sof_ipc_dai_config *config;
 	struct snd_sof_dai *sof_dai;
 	struct sof_ipc_reply reply;
 	int ret = 0;

 	list_for_each_entry(sof_dai, &hda_stream->sdev->dai_list, list) {
 		if (!sof_dai->cpu_dai_name)
 			continue;

 		if (!strcmp(dai_name, sof_dai->cpu_dai_name) &&
 		    dir == sof_dai->comp_dai.direction) {
 			config = sof_dai->dai_config;

 			if (!config) {
 				dev_err(hda_stream->sdev->dev,
 					"error: no config for DAI %s\n",
 					sof_dai->name);
 				return -EINVAL;
 			}

 			/* update config with stream tag */
 			config->hda.link_dma_ch = channel;

 			/* send IPC */
 			ret = sof_ipc_tx_message(hda_stream->sdev->ipc,
 						 config->hdr.cmd,
 						 config,
 						 config->hdr.size,
 						 &reply, sizeof(reply));

 			if (ret < 0)
 				dev_err(hda_stream->sdev->dev,
 					"error: failed to set dai config for %s\n",
 					sof_dai->name);
 			return ret;
 		}
 	}

 	return -EINVAL;
 }

 static int hda_link_hw_params(struct snd_pcm_substream *substream,
 			      struct snd_pcm_hw_params *params,
 			      struct snd_soc_dai *dai)
 {
 	struct hdac_stream *hstream = substream->runtime->private_data;
 	struct hdac_bus *bus = hstream->bus;
 	struct hdac_ext_stream *link_dev;
 	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct sof_intel_hda_stream *hda_stream;
 	struct hda_pipe_params p_params = {0};
 	struct hdac_ext_link *link;
 	int stream_tag;
 	int ret;

 	/* get stored dma data if resuming from system suspend */
 	link_dev = snd_soc_dai_get_dma_data(dai, substream);
 	if (!link_dev) {
 		link_dev = hda_link_stream_assign(bus, substream);
 		if (!link_dev)
 			return -EBUSY;
 	}

 	stream_tag = hdac_stream(link_dev)->stream_tag;

 	hda_stream = hstream_to_sof_hda_stream(link_dev);

 	/* update the DSP with the new tag */
 	ret = hda_link_config_ipc(hda_stream, dai->name, stream_tag - 1,
 				  substream->stream);
 	if (ret < 0)
 		return ret;

 	snd_soc_dai_set_dma_data(dai, substream, (void *)link_dev);

 	link = snd_hdac_ext_bus_get_link(bus, codec_dai->component->name);
 	if (!link)
 		return -EINVAL;

 	/* set the stream tag in the codec dai dma params */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		snd_soc_dai_set_tdm_slot(codec_dai, stream_tag, 0, 0, 0);
 	else
 		snd_soc_dai_set_tdm_slot(codec_dai, 0, stream_tag, 0, 0);

 	p_params.s_fmt = snd_pcm_format_width(params_format(params));
 	p_params.ch = params_channels(params);
 	p_params.s_freq = params_rate(params);
 	p_params.stream = substream->stream;
 	p_params.link_dma_id = stream_tag - 1;
 	p_params.link_index = link->index;
 	p_params.format = params_format(params);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		p_params.link_bps = codec_dai->driver->playback.sig_bits;
 	else
 		p_params.link_bps = codec_dai->driver->capture.sig_bits;

 	return hda_link_dma_params(link_dev, &p_params);
 }

 static int hda_link_pcm_prepare(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
 	struct hdac_ext_stream *link_dev =
 				snd_soc_dai_get_dma_data(dai, substream);
 	struct sof_intel_hda_stream *hda_stream;
 	struct snd_sof_dev *sdev =
 				snd_soc_component_get_drvdata(dai->component);
 	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 	int stream = substream->stream;

 	hda_stream = hstream_to_sof_hda_stream(link_dev);

 	if (link_dev->link_prepared)
 		return 0;

 	dev_dbg(sdev->dev, "hda: prepare stream dir %d\n", substream->stream);

 	return hda_link_hw_params(substream, &rtd->dpcm[stream].hw_params,
 				  dai);
 }

 static int hda_link_pcm_trigger(struct snd_pcm_substream *substream,
 				int cmd, struct snd_soc_dai *dai)
 {
 	struct hdac_ext_stream *link_dev =
 				snd_soc_dai_get_dma_data(dai, substream);
 	struct sof_intel_hda_stream *hda_stream;
 	struct snd_soc_pcm_runtime *rtd;
 	struct hdac_ext_link *link;
 	struct hdac_stream *hstream;
 	struct hdac_bus *bus;
 	int stream_tag;
 	int ret;

 	hstream = substream->runtime->private_data;
 	bus = hstream->bus;
 	rtd = snd_pcm_substream_chip(substream);

 	link = snd_hdac_ext_bus_get_link(bus, rtd->codec_dai->component->name);
 	if (!link)
 		return -EINVAL;

 	hda_stream = hstream_to_sof_hda_stream(link_dev);

 	dev_dbg(dai->dev, "In %s cmd=%d\n", __func__, cmd);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_RESUME:
 		/* set up hw_params */
 		ret = hda_link_pcm_prepare(substream, dai);
 		if (ret < 0) {
 			dev_err(dai->dev,
 				"error: setting up hw_params during resume\n");
 			return ret;
 		}

 		/* fallthrough */
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		snd_hdac_ext_link_stream_start(link_dev);
 		break;
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_STOP:
 		/*
 		 * clear link DMA channel. It will be assigned when
 		 * hw_params is set up again after resume.
 		 */
 		ret = hda_link_config_ipc(hda_stream, dai->name,
 					  DMA_CHAN_INVALID, substream->stream);
 		if (ret < 0)
 			return ret;

 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			stream_tag = hdac_stream(link_dev)->stream_tag;
 			snd_hdac_ext_link_clear_stream_id(link, stream_tag);
 		}

 		link_dev->link_prepared = 0;

 		/* fallthrough */
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		snd_hdac_ext_link_stream_clear(link_dev);
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static int hda_link_hw_free(struct snd_pcm_substream *substream,
 			    struct snd_soc_dai *dai)
 {
 	unsigned int stream_tag;
 	struct sof_intel_hda_stream *hda_stream;
 	struct hdac_bus *bus;
 	struct hdac_ext_link *link;
 	struct hdac_stream *hstream;
 	struct snd_soc_pcm_runtime *rtd;
 	struct hdac_ext_stream *link_dev;
 	int ret;

 	hstream = substream->runtime->private_data;
 	bus = hstream->bus;
 	rtd = snd_pcm_substream_chip(substream);
 	link_dev = snd_soc_dai_get_dma_data(dai, substream);
 	hda_stream = hstream_to_sof_hda_stream(link_dev);

 	/* free the link DMA channel in the FW */
 	ret = hda_link_config_ipc(hda_stream, dai->name, DMA_CHAN_INVALID,
 				  substream->stream);
 	if (ret < 0)
 		return ret;

 	link = snd_hdac_ext_bus_get_link(bus, rtd->codec_dai->component->name);
 	if (!link)
 		return -EINVAL;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		stream_tag = hdac_stream(link_dev)->stream_tag;
 		snd_hdac_ext_link_clear_stream_id(link, stream_tag);
 	}

 	snd_soc_dai_set_dma_data(dai, substream, NULL);
 	snd_hdac_ext_stream_release(link_dev, HDAC_EXT_STREAM_TYPE_LINK);
 	link_dev->link_prepared = 0;

 	/* free the host DMA channel reserved by hostless streams */
 	hda_stream->host_reserved = 0;

 	return 0;
 }

 static const struct snd_soc_dai_ops hda_link_dai_ops = {
 	.hw_params = hda_link_hw_params,
 	.hw_free = hda_link_hw_free,
 	.trigger = hda_link_pcm_trigger,
 	.prepare = hda_link_pcm_prepare,
 };
 #endif

 /*
  * common dai driver for skl+ platforms.
  * some products who use this DAI array only physically have a subset of
  * the DAIs, but no harm is done here by adding the whole set.
  */
 struct snd_soc_dai_driver skl_dai[] = {
 {
 	.name = "SSP0 Pin",
 },
 {
 	.name = "SSP1 Pin",
 },
 {
 	.name = "SSP2 Pin",
 },
 {
 	.name = "SSP3 Pin",
 },
 {
 	.name = "SSP4 Pin",
 },
 {
 	.name = "SSP5 Pin",
 },
 {
 	.name = "DMIC01 Pin",
 },
 {
 	.name = "DMIC16k Pin",
 },
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
 {
 	.name = "iDisp1 Pin",
 	.ops = &hda_link_dai_ops,
 },
 {
 	.name = "iDisp2 Pin",
 	.ops = &hda_link_dai_ops,
 },
 {
 	.name = "iDisp3 Pin",
 	.ops = &hda_link_dai_ops,
 },
 {
 	.name = "Analog CPU DAI",
 	.ops = &hda_link_dai_ops,
 },
 {
 	.name = "Digital CPU DAI",
 	.ops = &hda_link_dai_ops,
 },
 {
 	.name = "Alt Analog CPU DAI",
 	.ops = &hda_link_dai_ops,
 },
 #endif
 };
	// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
	//
	// This file is provided under a dual BSD/GPLv2 license. When using or
	// redistributing this file, you may do so under either license.
	//
	// Copyright(c) 2018 Intel Corporation. All rights reserved.
	//
	// Authors: Keyon Jie <yang.jie@linux.intel.com>
	//

	#include <sound/pcm_params.h>
	#include <sound/hdaudio_ext.h>
	#include "../sof-priv.h"
	#include "hda.h"

	#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)

	struct hda_pipe_params {
	u8 host_dma_id;
	u8 link_dma_id;
	u32 ch;
	u32 s_freq;
	u32 s_fmt;
	u8 linktype;
	snd_pcm_format_t format;
	int link_index;
	int stream;
	unsigned int host_bps;
	unsigned int link_bps;
	};

	/*
	* This function checks if the host dma channel corresponding
	* to the link DMA stream_tag argument is assigned to one
	* of the FEs connected to the BE DAI.
	*/
	static bool hda_check_fes(struct snd_soc_pcm_runtime *rtd,
	int dir, int stream_tag)
	{
	struct snd_pcm_substream *fe_substream;
	struct hdac_stream *fe_hstream;
	struct snd_soc_dpcm *dpcm;

	for_each_dpcm_fe(rtd, dir, dpcm) {
	fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, dir);
	fe_hstream = fe_substream->runtime->private_data;
	if (fe_hstream->stream_tag == stream_tag)
	return true;
	}

	return false;
	}

	static struct hdac_ext_stream *
	hda_link_stream_assign(struct hdac_bus *bus,
	struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct sof_intel_hda_stream *hda_stream;
	struct hdac_ext_stream *res = NULL;
	struct hdac_stream *stream = NULL;

	int stream_dir = substream->stream;

	if (!bus->ppcap) {
	dev_err(bus->dev, "stream type not supported\n");
	return NULL;
	}

	list_for_each_entry(stream, &bus->stream_list, list) {
	struct hdac_ext_stream *hstream =
	stream_to_hdac_ext_stream(stream);
	if (stream->direction != substream->stream)
	continue;

	hda_stream = hstream_to_sof_hda_stream(hstream);

	/* check if link is available */
	if (!hstream->link_locked) {
	if (stream->opened) {
	/*
	* check if the stream tag matches the stream
	* tag of one of the connected FEs
	*/
	if (hda_check_fes(rtd, stream_dir,
	stream->stream_tag)) {
	res = hstream;
	break;
	}
	} else {
	res = hstream;

	/*
	* This must be a hostless stream.
	* So reserve the host DMA channel.
	*/
	hda_stream->host_reserved = 1;
	break;
	}
	}
	}

	if (res) {
	/*
	* Decouple host and link DMA. The decoupled flag
	* is updated in snd_hdac_ext_stream_decouple().
	*/
	if (!res->decoupled)
	snd_hdac_ext_stream_decouple(bus, res, true);
	spin_lock_irq(&bus->reg_lock);
	res->link_locked = 1;
	res->link_substream = substream;
	spin_unlock_irq(&bus->reg_lock);
	}

	return res;
	}

	static int hda_link_dma_params(struct hdac_ext_stream *stream,
	struct hda_pipe_params *params)
	{
	struct hdac_stream *hstream = &stream->hstream;
	unsigned char stream_tag = hstream->stream_tag;
	struct hdac_bus *bus = hstream->bus;
	struct hdac_ext_link *link;
	unsigned int format_val;

	snd_hdac_ext_stream_decouple(bus, stream, true);
	snd_hdac_ext_link_stream_reset(stream);

	format_val = snd_hdac_calc_stream_format(params->s_freq, params->ch,
	params->format,
	params->link_bps, 0);

	dev_dbg(bus->dev, "format_val=%d, rate=%d, ch=%d, format=%d\n",
	format_val, params->s_freq, params->ch, params->format);

	snd_hdac_ext_link_stream_setup(stream, format_val);

	if (stream->hstream.direction == SNDRV_PCM_STREAM_PLAYBACK) {
	list_for_each_entry(link, &bus->hlink_list, list) {
	if (link->index == params->link_index)
	snd_hdac_ext_link_set_stream_id(link,
	stream_tag);
	}
	}

	stream->link_prepared = 1;

	return 0;
	}

	/* Send DAI_CONFIG IPC to the DAI that matches the dai_name and direction */
	static int hda_link_config_ipc(struct sof_intel_hda_stream *hda_stream,
	const char *dai_name, int channel, int dir)
	{
	struct sof_ipc_dai_config *config;
	struct snd_sof_dai *sof_dai;
	struct sof_ipc_reply reply;
	int ret = 0;

	list_for_each_entry(sof_dai, &hda_stream->sdev->dai_list, list) {
	if (!sof_dai->cpu_dai_name)
	continue;

	if (!strcmp(dai_name, sof_dai->cpu_dai_name) &&
	dir == sof_dai->comp_dai.direction) {
	config = sof_dai->dai_config;

	if (!config) {
	dev_err(hda_stream->sdev->dev,
	"error: no config for DAI %s\n",
	sof_dai->name);
	return -EINVAL;
	}

	/* update config with stream tag */
	config->hda.link_dma_ch = channel;

	/* send IPC */
	ret = sof_ipc_tx_message(hda_stream->sdev->ipc,
	config->hdr.cmd,
	config,
	config->hdr.size,
	&reply, sizeof(reply));

	if (ret < 0)
	dev_err(hda_stream->sdev->dev,
	"error: failed to set dai config for %s\n",
	sof_dai->name);
	return ret;
	}
	}

	return -EINVAL;
	}

	static int hda_link_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct hdac_stream *hstream = substream->runtime->private_data;
	struct hdac_bus *bus = hstream->bus;
	struct hdac_ext_stream *link_dev;
	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct sof_intel_hda_stream *hda_stream;
	struct hda_pipe_params p_params = {0};
	struct hdac_ext_link *link;
	int stream_tag;
	int ret;

	/* get stored dma data if resuming from system suspend */
	link_dev = snd_soc_dai_get_dma_data(dai, substream);
	if (!link_dev) {
	link_dev = hda_link_stream_assign(bus, substream);
	if (!link_dev)
	return -EBUSY;
	}

	stream_tag = hdac_stream(link_dev)->stream_tag;

	hda_stream = hstream_to_sof_hda_stream(link_dev);

	/* update the DSP with the new tag */
	ret = hda_link_config_ipc(hda_stream, dai->name, stream_tag - 1,
	substream->stream);
	if (ret < 0)
	return ret;

	snd_soc_dai_set_dma_data(dai, substream, (void *)link_dev);

	link = snd_hdac_ext_bus_get_link(bus, codec_dai->component->name);
	if (!link)
	return -EINVAL;

	/* set the stream tag in the codec dai dma params */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	snd_soc_dai_set_tdm_slot(codec_dai, stream_tag, 0, 0, 0);
	else
	snd_soc_dai_set_tdm_slot(codec_dai, 0, stream_tag, 0, 0);

	p_params.s_fmt = snd_pcm_format_width(params_format(params));
	p_params.ch = params_channels(params);
	p_params.s_freq = params_rate(params);
	p_params.stream = substream->stream;
	p_params.link_dma_id = stream_tag - 1;
	p_params.link_index = link->index;
	p_params.format = params_format(params);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	p_params.link_bps = codec_dai->driver->playback.sig_bits;
	else
	p_params.link_bps = codec_dai->driver->capture.sig_bits;

	return hda_link_dma_params(link_dev, &p_params);
	}

	static int hda_link_pcm_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct hdac_ext_stream *link_dev =
	snd_soc_dai_get_dma_data(dai, substream);
	struct sof_intel_hda_stream *hda_stream;
	struct snd_sof_dev *sdev =
	snd_soc_component_get_drvdata(dai->component);
	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
	int stream = substream->stream;

	hda_stream = hstream_to_sof_hda_stream(link_dev);

	if (link_dev->link_prepared)
	return 0;

	dev_dbg(sdev->dev, "hda: prepare stream dir %d\n", substream->stream);

	return hda_link_hw_params(substream, &rtd->dpcm[stream].hw_params,
	dai);
	}

	static int hda_link_pcm_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct hdac_ext_stream *link_dev =
	snd_soc_dai_get_dma_data(dai, substream);
	struct sof_intel_hda_stream *hda_stream;
	struct snd_soc_pcm_runtime *rtd;
	struct hdac_ext_link *link;
	struct hdac_stream *hstream;
	struct hdac_bus *bus;
	int stream_tag;
	int ret;

	hstream = substream->runtime->private_data;
	bus = hstream->bus;
	rtd = snd_pcm_substream_chip(substream);

	link = snd_hdac_ext_bus_get_link(bus, rtd->codec_dai->component->name);
	if (!link)
	return -EINVAL;

	hda_stream = hstream_to_sof_hda_stream(link_dev);

	dev_dbg(dai->dev, "In %s cmd=%d\n", __func__, cmd);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_RESUME:
	/* set up hw_params */
	ret = hda_link_pcm_prepare(substream, dai);
	if (ret < 0) {
	dev_err(dai->dev,
	"error: setting up hw_params during resume\n");
	return ret;
	}

	/* fallthrough */
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	snd_hdac_ext_link_stream_start(link_dev);
	break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
	/*
	* clear link DMA channel. It will be assigned when
	* hw_params is set up again after resume.
	*/
	ret = hda_link_config_ipc(hda_stream, dai->name,
	DMA_CHAN_INVALID, substream->stream);
	if (ret < 0)
	return ret;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	stream_tag = hdac_stream(link_dev)->stream_tag;
	snd_hdac_ext_link_clear_stream_id(link, stream_tag);
	}

	link_dev->link_prepared = 0;

	/* fallthrough */
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	snd_hdac_ext_link_stream_clear(link_dev);
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static int hda_link_hw_free(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	unsigned int stream_tag;
	struct sof_intel_hda_stream *hda_stream;
	struct hdac_bus *bus;
	struct hdac_ext_link *link;
	struct hdac_stream *hstream;
	struct snd_soc_pcm_runtime *rtd;
	struct hdac_ext_stream *link_dev;
	int ret;

	hstream = substream->runtime->private_data;
	bus = hstream->bus;
	rtd = snd_pcm_substream_chip(substream);
	link_dev = snd_soc_dai_get_dma_data(dai, substream);
	hda_stream = hstream_to_sof_hda_stream(link_dev);

	/* free the link DMA channel in the FW */
	ret = hda_link_config_ipc(hda_stream, dai->name, DMA_CHAN_INVALID,
	substream->stream);
	if (ret < 0)
	return ret;

	link = snd_hdac_ext_bus_get_link(bus, rtd->codec_dai->component->name);
	if (!link)
	return -EINVAL;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	stream_tag = hdac_stream(link_dev)->stream_tag;
	snd_hdac_ext_link_clear_stream_id(link, stream_tag);
	}

	snd_soc_dai_set_dma_data(dai, substream, NULL);
	snd_hdac_ext_stream_release(link_dev, HDAC_EXT_STREAM_TYPE_LINK);
	link_dev->link_prepared = 0;

	/* free the host DMA channel reserved by hostless streams */
	hda_stream->host_reserved = 0;

	return 0;
	}

	static const struct snd_soc_dai_ops hda_link_dai_ops = {
	.hw_params = hda_link_hw_params,
	.hw_free = hda_link_hw_free,
	.trigger = hda_link_pcm_trigger,
	.prepare = hda_link_pcm_prepare,
	};
	#endif

	/*
	* common dai driver for skl+ platforms.
	* some products who use this DAI array only physically have a subset of
	* the DAIs, but no harm is done here by adding the whole set.
	*/
	struct snd_soc_dai_driver skl_dai[] = {
	{
	.name = "SSP0 Pin",
	},
	{
	.name = "SSP1 Pin",
	},
	{
	.name = "SSP2 Pin",
	},
	{
	.name = "SSP3 Pin",
	},
	{
	.name = "SSP4 Pin",
	},
	{
	.name = "SSP5 Pin",
	},
	{
	.name = "DMIC01 Pin",
	},
	{
	.name = "DMIC16k Pin",
	},
	#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
	{
	.name = "iDisp1 Pin",
	.ops = &hda_link_dai_ops,
	},
	{
	.name = "iDisp2 Pin",
	.ops = &hda_link_dai_ops,
	},
	{
	.name = "iDisp3 Pin",
	.ops = &hda_link_dai_ops,
	},
	{
	.name = "Analog CPU DAI",
	.ops = &hda_link_dai_ops,
	},
	{
	.name = "Digital CPU DAI",
	.ops = &hda_link_dai_ops,
	},
	{
	.name = "Alt Analog CPU DAI",
	.ops = &hda_link_dai_ops,
	},
	#endif
	};