Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3065 insertions, 0 deletions

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
new file mode 100644
index 000000000..f3964060a
--- /dev/null
+++ b/sound/soc/soc-pcm.c
@@ -0,0 +1,3065 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// soc-pcm.c  --  ALSA SoC PCM
+//
+// Copyright 2005 Wolfson Microelectronics PLC.
+// Copyright 2005 Openedhand Ltd.
+// Copyright (C) 2010 Slimlogic Ltd.
+// Copyright (C) 2010 Texas Instruments Inc.
+//
+// Authors: Liam Girdwood <lrg@ti.com>
+//          Mark Brown <broonie@opensource.wolfsonmicro.com>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/export.h>
+#include <linux/debugfs.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dpcm.h>
+#include <sound/soc-link.h>
+#include <sound/initval.h>
+
+#define soc_pcm_ret(rtd, ret) _soc_pcm_ret(rtd, __func__, ret)
+static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
+			       const char *func, int ret)
+{
+	/* Positive, Zero values are not errors */
+	if (ret >= 0)
+		return ret;
+
+	/* Negative values might be errors */
+	switch (ret) {
+	case -EPROBE_DEFER:
+	case -ENOTSUPP:
+		break;
+	default:
+		dev_err(rtd->dev,
+			"ASoC: error at %s on %s: %d\n",
+			func, rtd->dai_link->name, ret);
+	}
+
+	return ret;
+}
+
+static inline void snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime *rtd)
+{
+	mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
+}
+
+static inline void snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime *rtd)
+{
+	mutex_unlock(&rtd->card->pcm_mutex);
+}
+
+#define snd_soc_dpcm_mutex_assert_held(rtd) \
+	lockdep_assert_held(&(rtd)->card->pcm_mutex)
+
+static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
+						int stream)
+{
+	snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
+}
+
+#define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
+	snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
+
+static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
+						  int stream)
+{
+	snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
+}
+
+#define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
+	snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
+
+#define DPCM_MAX_BE_USERS	8
+
+static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
+{
+	return (rtd)->dai_link->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
+}
+static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
+{
+	return (rtd)->dai_link->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
+}
+
+#ifdef CONFIG_DEBUG_FS
+static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
+{
+	switch (state) {
+	case SND_SOC_DPCM_STATE_NEW:
+		return "new";
+	case SND_SOC_DPCM_STATE_OPEN:
+		return "open";
+	case SND_SOC_DPCM_STATE_HW_PARAMS:
+		return "hw_params";
+	case SND_SOC_DPCM_STATE_PREPARE:
+		return "prepare";
+	case SND_SOC_DPCM_STATE_START:
+		return "start";
+	case SND_SOC_DPCM_STATE_STOP:
+		return "stop";
+	case SND_SOC_DPCM_STATE_SUSPEND:
+		return "suspend";
+	case SND_SOC_DPCM_STATE_PAUSED:
+		return "paused";
+	case SND_SOC_DPCM_STATE_HW_FREE:
+		return "hw_free";
+	case SND_SOC_DPCM_STATE_CLOSE:
+		return "close";
+	}
+
+	return "unknown";
+}
+
+static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
+			       int stream, char *buf, size_t size)
+{
+	struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
+	struct snd_soc_dpcm *dpcm;
+	ssize_t offset = 0;
+
+	/* FE state */
+	offset += scnprintf(buf + offset, size - offset,
+			   "[%s - %s]\n", fe->dai_link->name,
+			   stream ? "Capture" : "Playback");
+
+	offset += scnprintf(buf + offset, size - offset, "State: %s\n",
+			   dpcm_state_string(fe->dpcm[stream].state));
+
+	if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
+	    (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
+		offset += scnprintf(buf + offset, size - offset,
+				   "Hardware Params: "
+				   "Format = %s, Channels = %d, Rate = %d\n",
+				   snd_pcm_format_name(params_format(params)),
+				   params_channels(params),
+				   params_rate(params));
+
+	/* BEs state */
+	offset += scnprintf(buf + offset, size - offset, "Backends:\n");
+
+	if (list_empty(&fe->dpcm[stream].be_clients)) {
+		offset += scnprintf(buf + offset, size - offset,
+				   " No active DSP links\n");
+		goto out;
+	}
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		params = &dpcm->hw_params;
+
+		offset += scnprintf(buf + offset, size - offset,
+				   "- %s\n", be->dai_link->name);
+
+		offset += scnprintf(buf + offset, size - offset,
+				   "   State: %s\n",
+				   dpcm_state_string(be->dpcm[stream].state));
+
+		if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
+		    (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
+			offset += scnprintf(buf + offset, size - offset,
+					   "   Hardware Params: "
+					   "Format = %s, Channels = %d, Rate = %d\n",
+					   snd_pcm_format_name(params_format(params)),
+					   params_channels(params),
+					   params_rate(params));
+	}
+out:
+	return offset;
+}
+
+static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
+				    size_t count, loff_t *ppos)
+{
+	struct snd_soc_pcm_runtime *fe = file->private_data;
+	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
+	int stream;
+	char *buf;
+
+	if (fe->dai_link->num_cpus > 1) {
+		dev_err(fe->dev,
+			"%s doesn't support Multi CPU yet\n", __func__);
+		return -EINVAL;
+	}
+
+	buf = kmalloc(out_count, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	snd_soc_dpcm_mutex_lock(fe);
+	for_each_pcm_streams(stream)
+		if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
+			offset += dpcm_show_state(fe, stream,
+						  buf + offset,
+						  out_count - offset);
+	snd_soc_dpcm_mutex_unlock(fe);
+
+	ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
+
+	kfree(buf);
+	return ret;
+}
+
+static const struct file_operations dpcm_state_fops = {
+	.open = simple_open,
+	.read = dpcm_state_read_file,
+	.llseek = default_llseek,
+};
+
+void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
+{
+	if (!rtd->dai_link->dynamic)
+		return;
+
+	if (!rtd->card->debugfs_card_root)
+		return;
+
+	rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
+						    rtd->card->debugfs_card_root);
+
+	debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
+			    rtd, &dpcm_state_fops);
+}
+
+static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
+{
+	char *name;
+
+	name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
+			 stream ? "capture" : "playback");
+	if (name) {
+		dpcm->debugfs_state = debugfs_create_dir(
+			name, dpcm->fe->debugfs_dpcm_root);
+		debugfs_create_u32("state", 0644, dpcm->debugfs_state,
+				   &dpcm->state);
+		kfree(name);
+	}
+}
+
+static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
+{
+	debugfs_remove_recursive(dpcm->debugfs_state);
+}
+
+#else
+static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
+					     int stream)
+{
+}
+
+static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
+{
+}
+#endif
+
+/* Set FE's runtime_update state; the state is protected via PCM stream lock
+ * for avoiding the race with trigger callback.
+ * If the state is unset and a trigger is pending while the previous operation,
+ * process the pending trigger action here.
+ */
+static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
+static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
+				     int stream, enum snd_soc_dpcm_update state)
+{
+	struct snd_pcm_substream *substream =
+		snd_soc_dpcm_get_substream(fe, stream);
+
+	snd_soc_dpcm_stream_lock_irq(fe, stream);
+	if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
+		dpcm_fe_dai_do_trigger(substream,
+				       fe->dpcm[stream].trigger_pending - 1);
+		fe->dpcm[stream].trigger_pending = 0;
+	}
+	fe->dpcm[stream].runtime_update = state;
+	snd_soc_dpcm_stream_unlock_irq(fe, stream);
+}
+
+static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
+				     int stream, enum snd_soc_dpcm_update state)
+{
+	be->dpcm[stream].runtime_update = state;
+}
+
+/**
+ * snd_soc_runtime_action() - Increment/Decrement active count for
+ * PCM runtime components
+ * @rtd: ASoC PCM runtime that is activated
+ * @stream: Direction of the PCM stream
+ * @action: Activate stream if 1. Deactivate if -1.
+ *
+ * Increments/Decrements the active count for all the DAIs and components
+ * attached to a PCM runtime.
+ * Should typically be called when a stream is opened.
+ *
+ * Must be called with the rtd->card->pcm_mutex being held
+ */
+void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
+			    int stream, int action)
+{
+	struct snd_soc_dai *dai;
+	int i;
+
+	snd_soc_dpcm_mutex_assert_held(rtd);
+
+	for_each_rtd_dais(rtd, i, dai)
+		snd_soc_dai_action(dai, stream, action);
+}
+EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
+
+/**
+ * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
+ * @rtd: The ASoC PCM runtime that should be checked.
+ *
+ * This function checks whether the power down delay should be ignored for a
+ * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
+ * been configured to ignore the delay, or if none of the components benefits
+ * from having the delay.
+ */
+bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *component;
+	bool ignore = true;
+	int i;
+
+	if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
+		return true;
+
+	for_each_rtd_components(rtd, i, component)
+		ignore &= !component->driver->use_pmdown_time;
+
+	return ignore;
+}
+
+/**
+ * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
+ * @substream: the pcm substream
+ * @hw: the hardware parameters
+ *
+ * Sets the substream runtime hardware parameters.
+ */
+int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
+	const struct snd_pcm_hardware *hw)
+{
+	substream->runtime->hw = *hw;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
+
+/* DPCM stream event, send event to FE and all active BEs. */
+int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
+	int event)
+{
+	struct snd_soc_dpcm *dpcm;
+
+	snd_soc_dpcm_mutex_assert_held(fe);
+
+	for_each_dpcm_be(fe, dir, dpcm) {
+
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+
+		dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
+				be->dai_link->name, event, dir);
+
+		if ((event == SND_SOC_DAPM_STREAM_STOP) &&
+		    (be->dpcm[dir].users >= 1))
+			continue;
+
+		snd_soc_dapm_stream_event(be, dir, event);
+	}
+
+	snd_soc_dapm_stream_event(fe, dir, event);
+
+	return 0;
+}
+
+static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
+				   struct snd_pcm_hw_params *params)
+{
+	if (params) {
+		dai->rate	 = params_rate(params);
+		dai->channels	 = params_channels(params);
+		dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
+	} else {
+		dai->rate	 = 0;
+		dai->channels	 = 0;
+		dai->sample_bits = 0;
+	}
+}
+
+static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
+					struct snd_soc_dai *soc_dai)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret;
+
+	if (!snd_soc_dai_active(soc_dai))
+		return 0;
+
+#define __soc_pcm_apply_symmetry(name, NAME)				\
+	if (soc_dai->name && (soc_dai->driver->symmetric_##name ||	\
+			      rtd->dai_link->symmetric_##name)) {	\
+		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
+			#name, soc_dai->name);				\
+									\
+		ret = snd_pcm_hw_constraint_single(substream->runtime,	\
+						   SNDRV_PCM_HW_PARAM_##NAME,\
+						   soc_dai->name);	\
+		if (ret < 0) {						\
+			dev_err(soc_dai->dev,				\
+				"ASoC: Unable to apply %s constraint: %d\n",\
+				#name, ret);				\
+			return ret;					\
+		}							\
+	}
+
+	__soc_pcm_apply_symmetry(rate,		RATE);
+	__soc_pcm_apply_symmetry(channels,	CHANNELS);
+	__soc_pcm_apply_symmetry(sample_bits,	SAMPLE_BITS);
+
+	return 0;
+}
+
+static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_dai d;
+	struct snd_soc_dai *dai;
+	struct snd_soc_dai *cpu_dai;
+	unsigned int symmetry, i;
+
+	d.name = __func__;
+	soc_pcm_set_dai_params(&d, params);
+
+#define __soc_pcm_params_symmetry(xxx)					\
+	symmetry = rtd->dai_link->symmetric_##xxx;			\
+	for_each_rtd_dais(rtd, i, dai)					\
+		symmetry |= dai->driver->symmetric_##xxx;		\
+									\
+	if (symmetry)							\
+		for_each_rtd_cpu_dais(rtd, i, cpu_dai)			\
+			if (!snd_soc_dai_is_dummy(cpu_dai) &&		\
+			    cpu_dai->xxx && cpu_dai->xxx != d.xxx) {	\
+				dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
+					#xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
+				return -EINVAL;				\
+			}
+
+	/* reject unmatched parameters when applying symmetry */
+	__soc_pcm_params_symmetry(rate);
+	__soc_pcm_params_symmetry(channels);
+	__soc_pcm_params_symmetry(sample_bits);
+
+	return 0;
+}
+
+static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_dai_link *link = rtd->dai_link;
+	struct snd_soc_dai *dai;
+	unsigned int symmetry, i;
+
+	symmetry = link->symmetric_rate ||
+		link->symmetric_channels ||
+		link->symmetric_sample_bits;
+
+	for_each_rtd_dais(rtd, i, dai)
+		symmetry = symmetry ||
+			dai->driver->symmetric_rate ||
+			dai->driver->symmetric_channels ||
+			dai->driver->symmetric_sample_bits;
+
+	if (symmetry)
+		substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
+}
+
+static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret;
+
+	if (!bits)
+		return;
+
+	ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
+	if (ret != 0)
+		dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
+				 bits, ret);
+}
+
+static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai;
+	struct snd_soc_dai *codec_dai;
+	int stream = substream->stream;
+	int i;
+	unsigned int bits = 0, cpu_bits = 0;
+
+	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+		struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
+
+		if (pcm_codec->sig_bits == 0) {
+			bits = 0;
+			break;
+		}
+		bits = max(pcm_codec->sig_bits, bits);
+	}
+
+	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+		struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
+
+		if (pcm_cpu->sig_bits == 0) {
+			cpu_bits = 0;
+			break;
+		}
+		cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
+	}
+
+	soc_pcm_set_msb(substream, bits);
+	soc_pcm_set_msb(substream, cpu_bits);
+}
+
+static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
+{
+	hw->rates		= UINT_MAX;
+	hw->rate_min		= 0;
+	hw->rate_max		= UINT_MAX;
+	hw->channels_min	= 0;
+	hw->channels_max	= UINT_MAX;
+	hw->formats		= ULLONG_MAX;
+}
+
+static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
+				   struct snd_soc_pcm_stream *p)
+{
+	hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
+
+	/* setup hw->rate_min/max via hw->rates first */
+	snd_pcm_hw_limit_rates(hw);
+
+	/* update hw->rate_min/max by snd_soc_pcm_stream */
+	hw->rate_min = max(hw->rate_min, p->rate_min);
+	hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
+}
+
+static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
+				   struct snd_soc_pcm_stream *p)
+{
+	hw->channels_min = max(hw->channels_min, p->channels_min);
+	hw->channels_max = min(hw->channels_max, p->channels_max);
+}
+
+static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
+				     struct snd_soc_pcm_stream *p)
+{
+	hw->formats &= p->formats;
+}
+
+/**
+ * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
+ * @rtd: ASoC PCM runtime
+ * @hw: PCM hardware parameters (output)
+ * @stream: Direction of the PCM stream
+ *
+ * Calculates the subset of stream parameters supported by all DAIs
+ * associated with the PCM stream.
+ */
+int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
+			    struct snd_pcm_hardware *hw, int stream)
+{
+	struct snd_soc_dai *codec_dai;
+	struct snd_soc_dai *cpu_dai;
+	struct snd_soc_pcm_stream *codec_stream;
+	struct snd_soc_pcm_stream *cpu_stream;
+	unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
+	int i;
+
+	soc_pcm_hw_init(hw);
+
+	/* first calculate min/max only for CPUs in the DAI link */
+	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+
+		/*
+		 * Skip CPUs which don't support the current stream type.
+		 * Otherwise, since the rate, channel, and format values will
+		 * zero in that case, we would have no usable settings left,
+		 * causing the resulting setup to fail.
+		 */
+		if (!snd_soc_dai_stream_valid(cpu_dai, stream))
+			continue;
+
+		cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
+
+		soc_pcm_hw_update_chan(hw, cpu_stream);
+		soc_pcm_hw_update_rate(hw, cpu_stream);
+		soc_pcm_hw_update_format(hw, cpu_stream);
+	}
+	cpu_chan_min = hw->channels_min;
+	cpu_chan_max = hw->channels_max;
+
+	/* second calculate min/max only for CODECs in the DAI link */
+	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+
+		/*
+		 * Skip CODECs which don't support the current stream type.
+		 * Otherwise, since the rate, channel, and format values will
+		 * zero in that case, we would have no usable settings left,
+		 * causing the resulting setup to fail.
+		 */
+		if (!snd_soc_dai_stream_valid(codec_dai, stream))
+			continue;
+
+		codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
+
+		soc_pcm_hw_update_chan(hw, codec_stream);
+		soc_pcm_hw_update_rate(hw, codec_stream);
+		soc_pcm_hw_update_format(hw, codec_stream);
+	}
+
+	/* Verify both a valid CPU DAI and a valid CODEC DAI were found */
+	if (!hw->channels_min)
+		return -EINVAL;
+
+	/*
+	 * chan min/max cannot be enforced if there are multiple CODEC DAIs
+	 * connected to CPU DAI(s), use CPU DAI's directly and let
+	 * channel allocation be fixed up later
+	 */
+	if (rtd->dai_link->num_codecs > 1) {
+		hw->channels_min = cpu_chan_min;
+		hw->channels_max = cpu_chan_max;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
+
+static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_hardware *hw = &substream->runtime->hw;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	u64 formats = hw->formats;
+
+	/*
+	 * At least one CPU and one CODEC should match. Otherwise, we should
+	 * have bailed out on a higher level, since there would be no CPU or
+	 * CODEC to support the transfer direction in that case.
+	 */
+	snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
+
+	if (formats)
+		hw->formats &= formats;
+}
+
+static int soc_pcm_components_open(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_component *component;
+	int i, ret = 0;
+
+	for_each_rtd_components(rtd, i, component) {
+		ret = snd_soc_component_module_get_when_open(component, substream);
+		if (ret < 0)
+			break;
+
+		ret = snd_soc_component_open(component, substream);
+		if (ret < 0)
+			break;
+	}
+
+	return ret;
+}
+
+static int soc_pcm_components_close(struct snd_pcm_substream *substream,
+				    int rollback)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_component *component;
+	int i, ret = 0;
+
+	for_each_rtd_components(rtd, i, component) {
+		int r = snd_soc_component_close(component, substream, rollback);
+		if (r < 0)
+			ret = r; /* use last ret */
+
+		snd_soc_component_module_put_when_close(component, substream, rollback);
+	}
+
+	return ret;
+}
+
+static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
+			 struct snd_pcm_substream *substream, int rollback)
+{
+	struct snd_soc_component *component;
+	struct snd_soc_dai *dai;
+	int i;
+
+	snd_soc_dpcm_mutex_assert_held(rtd);
+
+	if (!rollback)
+		snd_soc_runtime_deactivate(rtd, substream->stream);
+
+	for_each_rtd_dais(rtd, i, dai)
+		snd_soc_dai_shutdown(dai, substream, rollback);
+
+	snd_soc_link_shutdown(substream, rollback);
+
+	soc_pcm_components_close(substream, rollback);
+
+	snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
+
+	for_each_rtd_components(rtd, i, component)
+		if (!snd_soc_component_active(component))
+			pinctrl_pm_select_sleep_state(component->dev);
+
+	return 0;
+}
+
+/*
+ * Called by ALSA when a PCM substream is closed. Private data can be
+ * freed here. The cpu DAI, codec DAI, machine and components are also
+ * shutdown.
+ */
+static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
+			   struct snd_pcm_substream *substream)
+{
+	return soc_pcm_clean(rtd, substream, 0);
+}
+
+/* PCM close ops for non-DPCM streams */
+static int soc_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+
+	snd_soc_dpcm_mutex_lock(rtd);
+	__soc_pcm_close(rtd, substream);
+	snd_soc_dpcm_mutex_unlock(rtd);
+	return 0;
+}
+
+static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_pcm_hardware *hw = &substream->runtime->hw;
+	const char *name_cpu = soc_cpu_dai_name(rtd);
+	const char *name_codec = soc_codec_dai_name(rtd);
+	const char *err_msg;
+	struct device *dev = rtd->dev;
+
+	err_msg = "rates";
+	if (!hw->rates)
+		goto config_err;
+
+	err_msg = "formats";
+	if (!hw->formats)
+		goto config_err;
+
+	err_msg = "channels";
+	if (!hw->channels_min || !hw->channels_max ||
+	     hw->channels_min  >  hw->channels_max)
+		goto config_err;
+
+	dev_dbg(dev, "ASoC: %s <-> %s info:\n",		name_codec,
+							name_cpu);
+	dev_dbg(dev, "ASoC: rate mask 0x%x\n",		hw->rates);
+	dev_dbg(dev, "ASoC: ch   min %d max %d\n",	hw->channels_min,
+							hw->channels_max);
+	dev_dbg(dev, "ASoC: rate min %d max %d\n",	hw->rate_min,
+							hw->rate_max);
+
+	return 0;
+
+config_err:
+	dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
+		name_codec, name_cpu, err_msg);
+	return -EINVAL;
+}
+
+/*
+ * Called by ALSA when a PCM substream is opened, the runtime->hw record is
+ * then initialized and any private data can be allocated. This also calls
+ * startup for the cpu DAI, component, machine and codec DAI.
+ */
+static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
+			  struct snd_pcm_substream *substream)
+{
+	struct snd_soc_component *component;
+	struct snd_soc_dai *dai;
+	int i, ret = 0;
+
+	snd_soc_dpcm_mutex_assert_held(rtd);
+
+	for_each_rtd_components(rtd, i, component)
+		pinctrl_pm_select_default_state(component->dev);
+
+	ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
+	if (ret < 0)
+		goto err;
+
+	ret = soc_pcm_components_open(substream);
+	if (ret < 0)
+		goto err;
+
+	ret = snd_soc_link_startup(substream);
+	if (ret < 0)
+		goto err;
+
+	/* startup the audio subsystem */
+	for_each_rtd_dais(rtd, i, dai) {
+		ret = snd_soc_dai_startup(dai, substream);
+		if (ret < 0)
+			goto err;
+	}
+
+	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
+	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
+		goto dynamic;
+
+	/* Check that the codec and cpu DAIs are compatible */
+	soc_pcm_init_runtime_hw(substream);
+
+	soc_pcm_update_symmetry(substream);
+
+	ret = soc_hw_sanity_check(substream);
+	if (ret < 0)
+		goto err;
+
+	soc_pcm_apply_msb(substream);
+
+	/* Symmetry only applies if we've already got an active stream. */
+	for_each_rtd_dais(rtd, i, dai) {
+		ret = soc_pcm_apply_symmetry(substream, dai);
+		if (ret != 0)
+			goto err;
+	}
+dynamic:
+	snd_soc_runtime_activate(rtd, substream->stream);
+	ret = 0;
+err:
+	if (ret < 0)
+		soc_pcm_clean(rtd, substream, 1);
+
+	return soc_pcm_ret(rtd, ret);
+}
+
+/* PCM open ops for non-DPCM streams */
+static int soc_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret;
+
+	snd_soc_dpcm_mutex_lock(rtd);
+	ret = __soc_pcm_open(rtd, substream);
+	snd_soc_dpcm_mutex_unlock(rtd);
+	return ret;
+}
+
+/*
+ * Called by ALSA when the PCM substream is prepared, can set format, sample
+ * rate, etc.  This function is non atomic and can be called multiple times,
+ * it can refer to the runtime info.
+ */
+static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
+			     struct snd_pcm_substream *substream)
+{
+	struct snd_soc_dai *dai;
+	int i, ret = 0;
+
+	snd_soc_dpcm_mutex_assert_held(rtd);
+
+	ret = snd_soc_link_prepare(substream);
+	if (ret < 0)
+		goto out;
+
+	ret = snd_soc_pcm_component_prepare(substream);
+	if (ret < 0)
+		goto out;
+
+	ret = snd_soc_pcm_dai_prepare(substream);
+	if (ret < 0)
+		goto out;
+
+	/* cancel any delayed stream shutdown that is pending */
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+	    rtd->pop_wait) {
+		rtd->pop_wait = 0;
+		cancel_delayed_work(&rtd->delayed_work);
+	}
+
+	snd_soc_dapm_stream_event(rtd, substream->stream,
+			SND_SOC_DAPM_STREAM_START);
+
+	for_each_rtd_dais(rtd, i, dai)
+		snd_soc_dai_digital_mute(dai, 0, substream->stream);
+
+out:
+	return soc_pcm_ret(rtd, ret);
+}
+
+/* PCM prepare ops for non-DPCM streams */
+static int soc_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret;
+
+	snd_soc_dpcm_mutex_lock(rtd);
+	ret = __soc_pcm_prepare(rtd, substream);
+	snd_soc_dpcm_mutex_unlock(rtd);
+	return ret;
+}
+
+static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
+				       unsigned int mask)
+{
+	struct snd_interval *interval;
+	int channels = hweight_long(mask);
+
+	interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+	interval->min = channels;
+	interval->max = channels;
+}
+
+static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
+			    struct snd_pcm_substream *substream, int rollback)
+{
+	struct snd_soc_dai *dai;
+	int i;
+
+	snd_soc_dpcm_mutex_assert_held(rtd);
+
+	/* clear the corresponding DAIs parameters when going to be inactive */
+	for_each_rtd_dais(rtd, i, dai) {
+		if (snd_soc_dai_active(dai) == 1)
+			soc_pcm_set_dai_params(dai, NULL);
+
+		if (snd_soc_dai_stream_active(dai, substream->stream) == 1)
+			snd_soc_dai_digital_mute(dai, 1, substream->stream);
+	}
+
+	/* run the stream event */
+	snd_soc_dapm_stream_stop(rtd, substream->stream);
+
+	/* free any machine hw params */
+	snd_soc_link_hw_free(substream, rollback);
+
+	/* free any component resources */
+	snd_soc_pcm_component_hw_free(substream, rollback);
+
+	/* now free hw params for the DAIs  */
+	for_each_rtd_dais(rtd, i, dai)
+		if (snd_soc_dai_stream_valid(dai, substream->stream))
+			snd_soc_dai_hw_free(dai, substream, rollback);
+
+	return 0;
+}
+
+/*
+ * Frees resources allocated by hw_params, can be called multiple times
+ */
+static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
+			     struct snd_pcm_substream *substream)
+{
+	return soc_pcm_hw_clean(rtd, substream, 0);
+}
+
+/* hw_free PCM ops for non-DPCM streams */
+static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret;
+
+	snd_soc_dpcm_mutex_lock(rtd);
+	ret = __soc_pcm_hw_free(rtd, substream);
+	snd_soc_dpcm_mutex_unlock(rtd);
+	return ret;
+}
+
+/*
+ * Called by ALSA when the hardware params are set by application. This
+ * function can also be called multiple times and can allocate buffers
+ * (using snd_pcm_lib_* ). It's non-atomic.
+ */
+static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
+			       struct snd_pcm_substream *substream,
+			       struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_dai *cpu_dai;
+	struct snd_soc_dai *codec_dai;
+	int i, ret = 0;
+
+	snd_soc_dpcm_mutex_assert_held(rtd);
+
+	ret = soc_pcm_params_symmetry(substream, params);
+	if (ret)
+		goto out;
+
+	ret = snd_soc_link_hw_params(substream, params);
+	if (ret < 0)
+		goto out;
+
+	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+		struct snd_pcm_hw_params codec_params;
+
+		/*
+		 * Skip CODECs which don't support the current stream type,
+		 * the idea being that if a CODEC is not used for the currently
+		 * set up transfer direction, it should not need to be
+		 * configured, especially since the configuration used might
+		 * not even be supported by that CODEC. There may be cases
+		 * however where a CODEC needs to be set up although it is
+		 * actually not being used for the transfer, e.g. if a
+		 * capture-only CODEC is acting as an LRCLK and/or BCLK master
+		 * for the DAI link including a playback-only CODEC.
+		 * If this becomes necessary, we will have to augment the
+		 * machine driver setup with information on how to act, so
+		 * we can do the right thing here.
+		 */
+		if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
+			continue;
+
+		/* copy params for each codec */
+		codec_params = *params;
+
+		/* fixup params based on TDM slot masks */
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+		    codec_dai->tx_mask)
+			soc_pcm_codec_params_fixup(&codec_params,
+						   codec_dai->tx_mask);
+
+		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
+		    codec_dai->rx_mask)
+			soc_pcm_codec_params_fixup(&codec_params,
+						   codec_dai->rx_mask);
+
+		ret = snd_soc_dai_hw_params(codec_dai, substream,
+					    &codec_params);
+		if(ret < 0)
+			goto out;
+
+		soc_pcm_set_dai_params(codec_dai, &codec_params);
+		snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
+	}
+
+	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+		/*
+		 * Skip CPUs which don't support the current stream
+		 * type. See soc_pcm_init_runtime_hw() for more details
+		 */
+		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
+			continue;
+
+		ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
+		if (ret < 0)
+			goto out;
+
+		/* store the parameters for each DAI */
+		soc_pcm_set_dai_params(cpu_dai, params);
+		snd_soc_dapm_update_dai(substream, params, cpu_dai);
+	}
+
+	ret = snd_soc_pcm_component_hw_params(substream, params);
+out:
+	if (ret < 0)
+		soc_pcm_hw_clean(rtd, substream, 1);
+
+	return soc_pcm_ret(rtd, ret);
+}
+
+/* hw_params PCM ops for non-DPCM streams */
+static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
+			     struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret;
+
+	snd_soc_dpcm_mutex_lock(rtd);
+	ret = __soc_pcm_hw_params(rtd, substream, params);
+	snd_soc_dpcm_mutex_unlock(rtd);
+	return ret;
+}
+
+static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	int ret = -EINVAL, _ret = 0;
+	int rollback = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		ret = snd_soc_link_trigger(substream, cmd, 0);
+		if (ret < 0)
+			goto start_err;
+
+		ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
+		if (ret < 0)
+			goto start_err;
+
+		ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
+start_err:
+		if (ret < 0)
+			rollback = 1;
+	}
+
+	if (rollback) {
+		_ret = ret;
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+			cmd = SNDRV_PCM_TRIGGER_STOP;
+			break;
+		case SNDRV_PCM_TRIGGER_RESUME:
+			cmd = SNDRV_PCM_TRIGGER_SUSPEND;
+			break;
+		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+			cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
+			break;
+		}
+	}
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (rtd->dai_link->stop_dma_first) {
+			ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
+			if (ret < 0)
+				break;
+
+			ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
+			if (ret < 0)
+				break;
+		} else {
+			ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
+			if (ret < 0)
+				break;
+
+			ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
+			if (ret < 0)
+				break;
+		}
+		ret = snd_soc_link_trigger(substream, cmd, rollback);
+		break;
+	}
+
+	if (_ret)
+		ret = _ret;
+
+	return ret;
+}
+
+/*
+ * soc level wrapper for pointer callback
+ * If cpu_dai, codec_dai, component driver has the delay callback, then
+ * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
+ */
+static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	snd_pcm_uframes_t offset = 0;
+	snd_pcm_sframes_t codec_delay = 0;
+	snd_pcm_sframes_t cpu_delay = 0;
+
+	offset = snd_soc_pcm_component_pointer(substream);
+
+	/* should be called *after* snd_soc_pcm_component_pointer() */
+	snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
+	snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
+
+	runtime->delay = cpu_delay + codec_delay;
+
+	return offset;
+}
+
+/* connect a FE and BE */
+static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
+		struct snd_soc_pcm_runtime *be, int stream)
+{
+	struct snd_pcm_substream *fe_substream;
+	struct snd_pcm_substream *be_substream;
+	struct snd_soc_dpcm *dpcm;
+
+	snd_soc_dpcm_mutex_assert_held(fe);
+
+	/* only add new dpcms */
+	for_each_dpcm_be(fe, stream, dpcm) {
+		if (dpcm->be == be && dpcm->fe == fe)
+			return 0;
+	}
+
+	fe_substream = snd_soc_dpcm_get_substream(fe, stream);
+	be_substream = snd_soc_dpcm_get_substream(be, stream);
+
+	if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
+		dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
+			__func__);
+		return -EINVAL;
+	}
+	if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
+		dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
+		be_substream->pcm->nonatomic = 1;
+	}
+
+	dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
+	if (!dpcm)
+		return -ENOMEM;
+
+	dpcm->be = be;
+	dpcm->fe = fe;
+	be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
+	dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
+	snd_soc_dpcm_stream_lock_irq(fe, stream);
+	list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
+	list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
+	snd_soc_dpcm_stream_unlock_irq(fe, stream);
+
+	dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
+			stream ? "capture" : "playback",  fe->dai_link->name,
+			stream ? "<-" : "->", be->dai_link->name);
+
+	dpcm_create_debugfs_state(dpcm, stream);
+
+	return 1;
+}
+
+/* reparent a BE onto another FE */
+static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
+			struct snd_soc_pcm_runtime *be, int stream)
+{
+	struct snd_soc_dpcm *dpcm;
+	struct snd_pcm_substream *fe_substream, *be_substream;
+
+	/* reparent if BE is connected to other FEs */
+	if (!be->dpcm[stream].users)
+		return;
+
+	be_substream = snd_soc_dpcm_get_substream(be, stream);
+	if (!be_substream)
+		return;
+
+	for_each_dpcm_fe(be, stream, dpcm) {
+		if (dpcm->fe == fe)
+			continue;
+
+		dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
+			stream ? "capture" : "playback",
+			dpcm->fe->dai_link->name,
+			stream ? "<-" : "->", dpcm->be->dai_link->name);
+
+		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
+		be_substream->runtime = fe_substream->runtime;
+		break;
+	}
+}
+
+/* disconnect a BE and FE */
+void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_soc_dpcm *dpcm, *d;
+	LIST_HEAD(deleted_dpcms);
+
+	snd_soc_dpcm_mutex_assert_held(fe);
+
+	snd_soc_dpcm_stream_lock_irq(fe, stream);
+	for_each_dpcm_be_safe(fe, stream, dpcm, d) {
+		dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
+				stream ? "capture" : "playback",
+				dpcm->be->dai_link->name);
+
+		if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
+			continue;
+
+		dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
+			stream ? "capture" : "playback", fe->dai_link->name,
+			stream ? "<-" : "->", dpcm->be->dai_link->name);
+
+		/* BEs still alive need new FE */
+		dpcm_be_reparent(fe, dpcm->be, stream);
+
+		list_del(&dpcm->list_be);
+		list_move(&dpcm->list_fe, &deleted_dpcms);
+	}
+	snd_soc_dpcm_stream_unlock_irq(fe, stream);
+
+	while (!list_empty(&deleted_dpcms)) {
+		dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
+					list_fe);
+		list_del(&dpcm->list_fe);
+		dpcm_remove_debugfs_state(dpcm);
+		kfree(dpcm);
+	}
+}
+
+/* get BE for DAI widget and stream */
+static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
+		struct snd_soc_dapm_widget *widget, int stream)
+{
+	struct snd_soc_pcm_runtime *be;
+	struct snd_soc_dapm_widget *w;
+	struct snd_soc_dai *dai;
+	int i;
+
+	dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
+
+	for_each_card_rtds(card, be) {
+
+		if (!be->dai_link->no_pcm)
+			continue;
+
+		if (!snd_soc_dpcm_get_substream(be, stream))
+			continue;
+
+		for_each_rtd_dais(be, i, dai) {
+			w = snd_soc_dai_get_widget(dai, stream);
+
+			dev_dbg(card->dev, "ASoC: try BE : %s\n",
+				w ? w->name : "(not set)");
+
+			if (w == widget)
+				return be;
+		}
+	}
+
+	/* Widget provided is not a BE */
+	return NULL;
+}
+
+static int widget_in_list(struct snd_soc_dapm_widget_list *list,
+		struct snd_soc_dapm_widget *widget)
+{
+	struct snd_soc_dapm_widget *w;
+	int i;
+
+	for_each_dapm_widgets(list, i, w)
+		if (widget == w)
+			return 1;
+
+	return 0;
+}
+
+bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
+{
+	struct snd_soc_card *card = widget->dapm->card;
+	struct snd_soc_pcm_runtime *rtd;
+	int stream;
+
+	/* adjust dir to stream */
+	if (dir == SND_SOC_DAPM_DIR_OUT)
+		stream = SNDRV_PCM_STREAM_PLAYBACK;
+	else
+		stream = SNDRV_PCM_STREAM_CAPTURE;
+
+	rtd = dpcm_get_be(card, widget, stream);
+	if (rtd)
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
+
+int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
+	int stream, struct snd_soc_dapm_widget_list **list)
+{
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
+	int paths;
+
+	if (fe->dai_link->num_cpus > 1) {
+		dev_err(fe->dev,
+			"%s doesn't support Multi CPU yet\n", __func__);
+		return -EINVAL;
+	}
+
+	/* get number of valid DAI paths and their widgets */
+	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
+			fe->card->component_chaining ?
+				NULL : dpcm_end_walk_at_be);
+
+	if (paths > 0)
+		dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
+			stream ? "capture" : "playback");
+	else if (paths == 0)
+		dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
+			 stream ? "capture" : "playback");
+
+	return paths;
+}
+
+void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
+{
+	snd_soc_dapm_dai_free_widgets(list);
+}
+
+static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
+			      struct snd_soc_dapm_widget_list *list)
+{
+	struct snd_soc_dai *dai;
+	unsigned int i;
+
+	/* is there a valid DAI widget for this BE */
+	for_each_rtd_dais(dpcm->be, i, dai) {
+		struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
+
+		/*
+		 * The BE is pruned only if none of the dai
+		 * widgets are in the active list.
+		 */
+		if (widget && widget_in_list(list, widget))
+			return true;
+	}
+
+	return false;
+}
+
+static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
+			    struct snd_soc_dapm_widget_list **list_)
+{
+	struct snd_soc_dpcm *dpcm;
+	int prune = 0;
+
+	/* Destroy any old FE <--> BE connections */
+	for_each_dpcm_be(fe, stream, dpcm) {
+		if (dpcm_be_is_active(dpcm, stream, *list_))
+			continue;
+
+		dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
+			stream ? "capture" : "playback",
+			dpcm->be->dai_link->name, fe->dai_link->name);
+		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+		dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
+		prune++;
+	}
+
+	dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
+	return prune;
+}
+
+static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
+	struct snd_soc_dapm_widget_list **list_)
+{
+	struct snd_soc_card *card = fe->card;
+	struct snd_soc_dapm_widget_list *list = *list_;
+	struct snd_soc_pcm_runtime *be;
+	struct snd_soc_dapm_widget *widget;
+	int i, new = 0, err;
+
+	/* don't connect if FE is not running */
+	if (!fe->dpcm[stream].runtime && !fe->fe_compr)
+		return new;
+
+	/* Create any new FE <--> BE connections */
+	for_each_dapm_widgets(list, i, widget) {
+
+		switch (widget->id) {
+		case snd_soc_dapm_dai_in:
+			if (stream != SNDRV_PCM_STREAM_PLAYBACK)
+				continue;
+			break;
+		case snd_soc_dapm_dai_out:
+			if (stream != SNDRV_PCM_STREAM_CAPTURE)
+				continue;
+			break;
+		default:
+			continue;
+		}
+
+		/* is there a valid BE rtd for this widget */
+		be = dpcm_get_be(card, widget, stream);
+		if (!be) {
+			dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
+				widget->name);
+			continue;
+		}
+
+		/*
+		 * Filter for systems with 'component_chaining' enabled.
+		 * This helps to avoid unnecessary re-configuration of an
+		 * already active BE on such systems.
+		 */
+		if (fe->card->component_chaining &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
+			continue;
+
+		/* newly connected FE and BE */
+		err = dpcm_be_connect(fe, be, stream);
+		if (err < 0) {
+			dev_err(fe->dev, "ASoC: can't connect %s\n",
+				widget->name);
+			break;
+		} else if (err == 0) /* already connected */
+			continue;
+
+		/* new */
+		dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
+		new++;
+	}
+
+	dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
+	return new;
+}
+
+/*
+ * Find the corresponding BE DAIs that source or sink audio to this
+ * FE substream.
+ */
+int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
+	int stream, struct snd_soc_dapm_widget_list **list, int new)
+{
+	if (new)
+		return dpcm_add_paths(fe, stream, list);
+	else
+		return dpcm_prune_paths(fe, stream, list);
+}
+
+void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_soc_dpcm *dpcm;
+
+	for_each_dpcm_be(fe, stream, dpcm)
+		dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
+}
+
+void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
+		      int do_hw_free, struct snd_soc_dpcm *last)
+{
+	struct snd_soc_dpcm *dpcm;
+
+	/* disable any enabled and non active backends */
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_pcm_substream *be_substream =
+			snd_soc_dpcm_get_substream(be, stream);
+
+		if (dpcm == last)
+			return;
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		if (be->dpcm[stream].users == 0) {
+			dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
+				stream ? "capture" : "playback",
+				be->dpcm[stream].state);
+			continue;
+		}
+
+		if (--be->dpcm[stream].users != 0)
+			continue;
+
+		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
+			if (!do_hw_free)
+				continue;
+
+			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
+				__soc_pcm_hw_free(be, be_substream);
+				be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
+			}
+		}
+
+		__soc_pcm_close(be, be_substream);
+		be_substream->runtime = NULL;
+		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+	}
+}
+
+int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_soc_pcm_runtime *be;
+	struct snd_soc_dpcm *dpcm;
+	int err, count = 0;
+
+	/* only startup BE DAIs that are either sinks or sources to this FE DAI */
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_pcm_substream *be_substream;
+
+		be = dpcm->be;
+		be_substream = snd_soc_dpcm_get_substream(be, stream);
+
+		if (!be_substream) {
+			dev_err(be->dev, "ASoC: no backend %s stream\n",
+				stream ? "capture" : "playback");
+			continue;
+		}
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		/* first time the dpcm is open ? */
+		if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
+			dev_err(be->dev, "ASoC: too many users %s at open %d\n",
+				stream ? "capture" : "playback",
+				be->dpcm[stream].state);
+			continue;
+		}
+
+		if (be->dpcm[stream].users++ != 0)
+			continue;
+
+		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
+			continue;
+
+		dev_dbg(be->dev, "ASoC: open %s BE %s\n",
+			stream ? "capture" : "playback", be->dai_link->name);
+
+		be_substream->runtime = be->dpcm[stream].runtime;
+		err = __soc_pcm_open(be, be_substream);
+		if (err < 0) {
+			be->dpcm[stream].users--;
+			if (be->dpcm[stream].users < 0)
+				dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
+					stream ? "capture" : "playback",
+					be->dpcm[stream].state);
+
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+			goto unwind;
+		}
+		be->dpcm[stream].be_start = 0;
+		be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
+		count++;
+	}
+
+	return count;
+
+unwind:
+	dpcm_be_dai_startup_rollback(fe, stream, dpcm);
+
+	return soc_pcm_ret(fe, err);
+}
+
+static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	struct snd_soc_dai *dai;
+	int stream = substream->stream;
+	u64 formats = hw->formats;
+	int i;
+
+	soc_pcm_hw_init(hw);
+
+	if (formats)
+		hw->formats &= formats;
+
+	for_each_rtd_cpu_dais(fe, i, dai) {
+		struct snd_soc_pcm_stream *cpu_stream;
+
+		/*
+		 * Skip CPUs which don't support the current stream
+		 * type. See soc_pcm_init_runtime_hw() for more details
+		 */
+		if (!snd_soc_dai_stream_valid(dai, stream))
+			continue;
+
+		cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
+
+		soc_pcm_hw_update_rate(hw, cpu_stream);
+		soc_pcm_hw_update_chan(hw, cpu_stream);
+		soc_pcm_hw_update_format(hw, cpu_stream);
+	}
+
+}
+
+static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	struct snd_soc_dpcm *dpcm;
+	struct snd_soc_dai *dai;
+	int stream = substream->stream;
+
+	if (!fe->dai_link->dpcm_merged_format)
+		return;
+
+	/*
+	 * It returns merged BE codec format
+	 * if FE want to use it (= dpcm_merged_format)
+	 */
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_soc_pcm_stream *codec_stream;
+		int i;
+
+		for_each_rtd_codec_dais(be, i, dai) {
+			/*
+			 * Skip CODECs which don't support the current stream
+			 * type. See soc_pcm_init_runtime_hw() for more details
+			 */
+			if (!snd_soc_dai_stream_valid(dai, stream))
+				continue;
+
+			codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
+
+			soc_pcm_hw_update_format(hw, codec_stream);
+		}
+	}
+}
+
+static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	struct snd_soc_dpcm *dpcm;
+	int stream = substream->stream;
+
+	if (!fe->dai_link->dpcm_merged_chan)
+		return;
+
+	/*
+	 * It returns merged BE codec channel;
+	 * if FE want to use it (= dpcm_merged_chan)
+	 */
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_soc_pcm_stream *cpu_stream;
+		struct snd_soc_dai *dai;
+		int i;
+
+		for_each_rtd_cpu_dais(be, i, dai) {
+			/*
+			 * Skip CPUs which don't support the current stream
+			 * type. See soc_pcm_init_runtime_hw() for more details
+			 */
+			if (!snd_soc_dai_stream_valid(dai, stream))
+				continue;
+
+			cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
+
+			soc_pcm_hw_update_chan(hw, cpu_stream);
+		}
+
+		/*
+		 * chan min/max cannot be enforced if there are multiple CODEC
+		 * DAIs connected to a single CPU DAI, use CPU DAI's directly
+		 */
+		if (be->dai_link->num_codecs == 1) {
+			struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
+				asoc_rtd_to_codec(be, 0), stream);
+
+			soc_pcm_hw_update_chan(hw, codec_stream);
+		}
+	}
+}
+
+static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	struct snd_soc_dpcm *dpcm;
+	int stream = substream->stream;
+
+	if (!fe->dai_link->dpcm_merged_rate)
+		return;
+
+	/*
+	 * It returns merged BE codec channel;
+	 * if FE want to use it (= dpcm_merged_chan)
+	 */
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_soc_pcm_stream *pcm;
+		struct snd_soc_dai *dai;
+		int i;
+
+		for_each_rtd_dais(be, i, dai) {
+			/*
+			 * Skip DAIs which don't support the current stream
+			 * type. See soc_pcm_init_runtime_hw() for more details
+			 */
+			if (!snd_soc_dai_stream_valid(dai, stream))
+				continue;
+
+			pcm = snd_soc_dai_get_pcm_stream(dai, stream);
+
+			soc_pcm_hw_update_rate(hw, pcm);
+		}
+	}
+}
+
+static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
+			       int stream)
+{
+	struct snd_soc_dpcm *dpcm;
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
+	struct snd_soc_dai *fe_cpu_dai;
+	int err = 0;
+	int i;
+
+	/* apply symmetry for FE */
+	soc_pcm_update_symmetry(fe_substream);
+
+	for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
+		/* Symmetry only applies if we've got an active stream. */
+		err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
+		if (err < 0)
+			goto error;
+	}
+
+	/* apply symmetry for BE */
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_pcm_substream *be_substream =
+			snd_soc_dpcm_get_substream(be, stream);
+		struct snd_soc_pcm_runtime *rtd;
+		struct snd_soc_dai *dai;
+
+		/* A backend may not have the requested substream */
+		if (!be_substream)
+			continue;
+
+		rtd = asoc_substream_to_rtd(be_substream);
+		if (rtd->dai_link->be_hw_params_fixup)
+			continue;
+
+		soc_pcm_update_symmetry(be_substream);
+
+		/* Symmetry only applies if we've got an active stream. */
+		for_each_rtd_dais(rtd, i, dai) {
+			err = soc_pcm_apply_symmetry(fe_substream, dai);
+			if (err < 0)
+				goto error;
+		}
+	}
+error:
+	return soc_pcm_ret(fe, err);
+}
+
+static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
+	int stream = fe_substream->stream, ret = 0;
+
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
+
+	ret = dpcm_be_dai_startup(fe, stream);
+	if (ret < 0)
+		goto be_err;
+
+	dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
+
+	/* start the DAI frontend */
+	ret = __soc_pcm_open(fe, fe_substream);
+	if (ret < 0)
+		goto unwind;
+
+	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
+
+	dpcm_runtime_setup_fe(fe_substream);
+
+	dpcm_runtime_setup_be_format(fe_substream);
+	dpcm_runtime_setup_be_chan(fe_substream);
+	dpcm_runtime_setup_be_rate(fe_substream);
+
+	ret = dpcm_apply_symmetry(fe_substream, stream);
+
+unwind:
+	if (ret < 0)
+		dpcm_be_dai_startup_unwind(fe, stream);
+be_err:
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
+
+	return soc_pcm_ret(fe, ret);
+}
+
+static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int stream = substream->stream;
+
+	snd_soc_dpcm_mutex_assert_held(fe);
+
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
+
+	/* shutdown the BEs */
+	dpcm_be_dai_shutdown(fe, stream);
+
+	dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
+
+	/* now shutdown the frontend */
+	__soc_pcm_close(fe, substream);
+
+	/* run the stream stop event */
+	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
+
+	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
+	return 0;
+}
+
+void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_soc_dpcm *dpcm;
+
+	/* only hw_params backends that are either sinks or sources
+	 * to this frontend DAI */
+	for_each_dpcm_be(fe, stream, dpcm) {
+
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_pcm_substream *be_substream =
+			snd_soc_dpcm_get_substream(be, stream);
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		/* only free hw when no longer used - check all FEs */
+		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+				continue;
+
+		/* do not free hw if this BE is used by other FE */
+		if (be->dpcm[stream].users > 1)
+			continue;
+
+		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
+			continue;
+
+		dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
+			be->dai_link->name);
+
+		__soc_pcm_hw_free(be, be_substream);
+
+		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
+	}
+}
+
+static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int stream = substream->stream;
+
+	snd_soc_dpcm_mutex_lock(fe);
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
+
+	dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
+
+	/* call hw_free on the frontend */
+	soc_pcm_hw_clean(fe, substream, 0);
+
+	/* only hw_params backends that are either sinks or sources
+	 * to this frontend DAI */
+	dpcm_be_dai_hw_free(fe, stream);
+
+	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
+
+	snd_soc_dpcm_mutex_unlock(fe);
+	return 0;
+}
+
+int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_soc_pcm_runtime *be;
+	struct snd_pcm_substream *be_substream;
+	struct snd_soc_dpcm *dpcm;
+	int ret;
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+		be = dpcm->be;
+		be_substream = snd_soc_dpcm_get_substream(be, stream);
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		/* copy params for each dpcm */
+		memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
+				sizeof(struct snd_pcm_hw_params));
+
+		/* perform any hw_params fixups */
+		ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
+		if (ret < 0)
+			goto unwind;
+
+		/* copy the fixed-up hw params for BE dai */
+		memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
+		       sizeof(struct snd_pcm_hw_params));
+
+		/* only allow hw_params() if no connected FEs are running */
+		if (!snd_soc_dpcm_can_be_params(fe, be, stream))
+			continue;
+
+		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
+			continue;
+
+		dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
+			be->dai_link->name);
+
+		ret = __soc_pcm_hw_params(be, be_substream, &dpcm->hw_params);
+		if (ret < 0)
+			goto unwind;
+
+		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
+	}
+	return 0;
+
+unwind:
+	dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
+		__func__, be->dai_link->name, ret);
+
+	/* disable any enabled and non active backends */
+	for_each_dpcm_be_rollback(fe, stream, dpcm) {
+		be = dpcm->be;
+		be_substream = snd_soc_dpcm_get_substream(be, stream);
+
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		/* only allow hw_free() if no connected FEs are running */
+		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+			continue;
+
+		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
+		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
+		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
+			continue;
+
+		__soc_pcm_hw_free(be, be_substream);
+	}
+
+	return ret;
+}
+
+static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int ret, stream = substream->stream;
+
+	snd_soc_dpcm_mutex_lock(fe);
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
+
+	memcpy(&fe->dpcm[stream].hw_params, params,
+			sizeof(struct snd_pcm_hw_params));
+	ret = dpcm_be_dai_hw_params(fe, stream);
+	if (ret < 0)
+		goto out;
+
+	dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
+			fe->dai_link->name, params_rate(params),
+			params_channels(params), params_format(params));
+
+	/* call hw_params on the frontend */
+	ret = __soc_pcm_hw_params(fe, substream, params);
+	if (ret < 0)
+		dpcm_be_dai_hw_free(fe, stream);
+	else
+		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
+
+out:
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
+	snd_soc_dpcm_mutex_unlock(fe);
+
+	return soc_pcm_ret(fe, ret);
+}
+
+int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
+			       int cmd)
+{
+	struct snd_soc_pcm_runtime *be;
+	bool pause_stop_transition;
+	struct snd_soc_dpcm *dpcm;
+	unsigned long flags;
+	int ret = 0;
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_pcm_substream *be_substream;
+
+		be = dpcm->be;
+		be_substream = snd_soc_dpcm_get_substream(be, stream);
+
+		snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			goto next;
+
+		dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
+			be->dai_link->name, cmd);
+
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+			if (!be->dpcm[stream].be_start &&
+			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
+			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
+			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
+				goto next;
+
+			be->dpcm[stream].be_start++;
+			if (be->dpcm[stream].be_start != 1)
+				goto next;
+
+			if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
+				ret = soc_pcm_trigger(be_substream,
+						      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
+			else
+				ret = soc_pcm_trigger(be_substream,
+						      SNDRV_PCM_TRIGGER_START);
+			if (ret) {
+				be->dpcm[stream].be_start--;
+				goto next;
+			}
+
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+			break;
+		case SNDRV_PCM_TRIGGER_RESUME:
+			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
+				goto next;
+
+			be->dpcm[stream].be_start++;
+			if (be->dpcm[stream].be_start != 1)
+				goto next;
+
+			ret = soc_pcm_trigger(be_substream, cmd);
+			if (ret) {
+				be->dpcm[stream].be_start--;
+				goto next;
+			}
+
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+			break;
+		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+			if (!be->dpcm[stream].be_start &&
+			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
+			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
+				goto next;
+
+			fe->dpcm[stream].fe_pause = false;
+			be->dpcm[stream].be_pause--;
+
+			be->dpcm[stream].be_start++;
+			if (be->dpcm[stream].be_start != 1)
+				goto next;
+
+			ret = soc_pcm_trigger(be_substream, cmd);
+			if (ret) {
+				be->dpcm[stream].be_start--;
+				goto next;
+			}
+
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+			break;
+		case SNDRV_PCM_TRIGGER_STOP:
+			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
+			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
+				goto next;
+
+			if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
+				be->dpcm[stream].be_start--;
+
+			if (be->dpcm[stream].be_start != 0)
+				goto next;
+
+			pause_stop_transition = false;
+			if (fe->dpcm[stream].fe_pause) {
+				pause_stop_transition = true;
+				fe->dpcm[stream].fe_pause = false;
+				be->dpcm[stream].be_pause--;
+			}
+
+			if (be->dpcm[stream].be_pause != 0)
+				ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
+			else
+				ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
+
+			if (ret) {
+				if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
+					be->dpcm[stream].be_start++;
+				if (pause_stop_transition) {
+					fe->dpcm[stream].fe_pause = true;
+					be->dpcm[stream].be_pause++;
+				}
+				goto next;
+			}
+
+			if (be->dpcm[stream].be_pause != 0)
+				be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
+			else
+				be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
+
+			break;
+		case SNDRV_PCM_TRIGGER_SUSPEND:
+			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
+				goto next;
+
+			be->dpcm[stream].be_start--;
+			if (be->dpcm[stream].be_start != 0)
+				goto next;
+
+			ret = soc_pcm_trigger(be_substream, cmd);
+			if (ret) {
+				be->dpcm[stream].be_start++;
+				goto next;
+			}
+
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
+			break;
+		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
+				goto next;
+
+			fe->dpcm[stream].fe_pause = true;
+			be->dpcm[stream].be_pause++;
+
+			be->dpcm[stream].be_start--;
+			if (be->dpcm[stream].be_start != 0)
+				goto next;
+
+			ret = soc_pcm_trigger(be_substream, cmd);
+			if (ret) {
+				be->dpcm[stream].be_start++;
+				goto next;
+			}
+
+			be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
+			break;
+		}
+next:
+		snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
+		if (ret)
+			break;
+	}
+	return soc_pcm_ret(fe, ret);
+}
+EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
+
+static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
+				  int cmd, bool fe_first)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int ret;
+
+	/* call trigger on the frontend before the backend. */
+	if (fe_first) {
+		dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
+			fe->dai_link->name, cmd);
+
+		ret = soc_pcm_trigger(substream, cmd);
+		if (ret < 0)
+			return ret;
+
+		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
+		return ret;
+	}
+
+	/* call trigger on the frontend after the backend. */
+	ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
+		fe->dai_link->name, cmd);
+
+	ret = soc_pcm_trigger(substream, cmd);
+
+	return ret;
+}
+
+static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int stream = substream->stream;
+	int ret = 0;
+	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
+
+	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+	switch (trigger) {
+	case SND_SOC_DPCM_TRIGGER_PRE:
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+		case SNDRV_PCM_TRIGGER_RESUME:
+		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		case SNDRV_PCM_TRIGGER_DRAIN:
+			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
+			break;
+		case SNDRV_PCM_TRIGGER_STOP:
+		case SNDRV_PCM_TRIGGER_SUSPEND:
+		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	case SND_SOC_DPCM_TRIGGER_POST:
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+		case SNDRV_PCM_TRIGGER_RESUME:
+		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		case SNDRV_PCM_TRIGGER_DRAIN:
+			ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
+			break;
+		case SNDRV_PCM_TRIGGER_STOP:
+		case SNDRV_PCM_TRIGGER_SUSPEND:
+		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+			ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	case SND_SOC_DPCM_TRIGGER_BESPOKE:
+		/* bespoke trigger() - handles both FE and BEs */
+
+		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
+				fe->dai_link->name, cmd);
+
+		ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
+		break;
+	default:
+		dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
+				fe->dai_link->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (ret < 0) {
+		dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
+			cmd, ret);
+		goto out;
+	}
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
+		break;
+	}
+
+out:
+	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+	return ret;
+}
+
+static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int stream = substream->stream;
+
+	/* if FE's runtime_update is already set, we're in race;
+	 * process this trigger later at exit
+	 */
+	if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
+		fe->dpcm[stream].trigger_pending = cmd + 1;
+		return 0; /* delayed, assuming it's successful */
+	}
+
+	/* we're alone, let's trigger */
+	return dpcm_fe_dai_do_trigger(substream, cmd);
+}
+
+int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_soc_dpcm *dpcm;
+	int ret = 0;
+
+	for_each_dpcm_be(fe, stream, dpcm) {
+
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+		struct snd_pcm_substream *be_substream =
+			snd_soc_dpcm_get_substream(be, stream);
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		if (!snd_soc_dpcm_can_be_prepared(fe, be, stream))
+			continue;
+
+		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
+		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
+			continue;
+
+		dev_dbg(be->dev, "ASoC: prepare BE %s\n",
+			be->dai_link->name);
+
+		ret = __soc_pcm_prepare(be, be_substream);
+		if (ret < 0)
+			break;
+
+		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
+	}
+
+	return soc_pcm_ret(fe, ret);
+}
+
+static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
+	int stream = substream->stream, ret = 0;
+
+	snd_soc_dpcm_mutex_lock(fe);
+
+	dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
+
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
+
+	/* there is no point preparing this FE if there are no BEs */
+	if (list_empty(&fe->dpcm[stream].be_clients)) {
+		dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
+				fe->dai_link->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = dpcm_be_dai_prepare(fe, stream);
+	if (ret < 0)
+		goto out;
+
+	/* call prepare on the frontend */
+	ret = __soc_pcm_prepare(fe, substream);
+	if (ret < 0)
+		goto out;
+
+	fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
+
+out:
+	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
+	snd_soc_dpcm_mutex_unlock(fe);
+
+	return soc_pcm_ret(fe, ret);
+}
+
+static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_pcm_substream *substream =
+		snd_soc_dpcm_get_substream(fe, stream);
+	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
+	int err;
+
+	dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
+			stream ? "capture" : "playback", fe->dai_link->name);
+
+	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
+		/* call bespoke trigger - FE takes care of all BE triggers */
+		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
+				fe->dai_link->name);
+
+		err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+	} else {
+		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
+			fe->dai_link->name);
+
+		err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
+	}
+
+	dpcm_be_dai_hw_free(fe, stream);
+
+	dpcm_be_dai_shutdown(fe, stream);
+
+	/* run the stream event for each BE */
+	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
+
+	return soc_pcm_ret(fe, err);
+}
+
+static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	struct snd_pcm_substream *substream =
+		snd_soc_dpcm_get_substream(fe, stream);
+	struct snd_soc_dpcm *dpcm;
+	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
+	int ret = 0;
+
+	dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
+			stream ? "capture" : "playback", fe->dai_link->name);
+
+	/* Only start the BE if the FE is ready */
+	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
+		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
+		dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
+			fe->dai_link->name, fe->dpcm[stream].state);
+		ret = -EINVAL;
+		goto disconnect;
+	}
+
+	/* startup must always be called for new BEs */
+	ret = dpcm_be_dai_startup(fe, stream);
+	if (ret < 0)
+		goto disconnect;
+
+	/* keep going if FE state is > open */
+	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
+		return 0;
+
+	ret = dpcm_be_dai_hw_params(fe, stream);
+	if (ret < 0)
+		goto close;
+
+	/* keep going if FE state is > hw_params */
+	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
+		return 0;
+
+	ret = dpcm_be_dai_prepare(fe, stream);
+	if (ret < 0)
+		goto hw_free;
+
+	/* run the stream event for each BE */
+	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
+
+	/* keep going if FE state is > prepare */
+	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
+		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
+		return 0;
+
+	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
+		/* call trigger on the frontend - FE takes care of all BE triggers */
+		dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
+				fe->dai_link->name);
+
+		ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
+		if (ret < 0)
+			goto hw_free;
+	} else {
+		dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
+			fe->dai_link->name);
+
+		ret = dpcm_be_dai_trigger(fe, stream,
+					SNDRV_PCM_TRIGGER_START);
+		if (ret < 0)
+			goto hw_free;
+	}
+
+	return 0;
+
+hw_free:
+	dpcm_be_dai_hw_free(fe, stream);
+close:
+	dpcm_be_dai_shutdown(fe, stream);
+disconnect:
+	/* disconnect any pending BEs */
+	for_each_dpcm_be(fe, stream, dpcm) {
+		struct snd_soc_pcm_runtime *be = dpcm->be;
+
+		/* is this op for this BE ? */
+		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+			continue;
+
+		if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
+			be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
+				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+	}
+
+	return soc_pcm_ret(fe, ret);
+}
+
+static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
+{
+	struct snd_soc_dapm_widget_list *list;
+	int stream;
+	int count, paths;
+
+	if (!fe->dai_link->dynamic)
+		return 0;
+
+	if (fe->dai_link->num_cpus > 1) {
+		dev_err(fe->dev,
+			"%s doesn't support Multi CPU yet\n", __func__);
+		return -EINVAL;
+	}
+
+	/* only check active links */
+	if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
+		return 0;
+
+	/* DAPM sync will call this to update DSP paths */
+	dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
+		new ? "new" : "old", fe->dai_link->name);
+
+	for_each_pcm_streams(stream) {
+
+		/* skip if FE doesn't have playback/capture capability */
+		if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
+		    !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
+			continue;
+
+		/* skip if FE isn't currently playing/capturing */
+		if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
+		    !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
+			continue;
+
+		paths = dpcm_path_get(fe, stream, &list);
+		if (paths < 0)
+			return paths;
+
+		/* update any playback/capture paths */
+		count = dpcm_process_paths(fe, stream, &list, new);
+		if (count) {
+			dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
+			if (new)
+				dpcm_run_update_startup(fe, stream);
+			else
+				dpcm_run_update_shutdown(fe, stream);
+			dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
+
+			dpcm_clear_pending_state(fe, stream);
+			dpcm_be_disconnect(fe, stream);
+		}
+
+		dpcm_path_put(&list);
+	}
+
+	return 0;
+}
+
+/* Called by DAPM mixer/mux changes to update audio routing between PCMs and
+ * any DAI links.
+ */
+int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
+{
+	struct snd_soc_pcm_runtime *fe;
+	int ret = 0;
+
+	mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
+	/* shutdown all old paths first */
+	for_each_card_rtds(card, fe) {
+		ret = soc_dpcm_fe_runtime_update(fe, 0);
+		if (ret)
+			goto out;
+	}
+
+	/* bring new paths up */
+	for_each_card_rtds(card, fe) {
+		ret = soc_dpcm_fe_runtime_update(fe, 1);
+		if (ret)
+			goto out;
+	}
+
+out:
+	mutex_unlock(&card->pcm_mutex);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
+
+static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
+	struct snd_soc_dpcm *dpcm;
+	int stream = fe_substream->stream;
+
+	snd_soc_dpcm_mutex_assert_held(fe);
+
+	/* mark FE's links ready to prune */
+	for_each_dpcm_be(fe, stream, dpcm)
+		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+
+	dpcm_be_disconnect(fe, stream);
+
+	fe->dpcm[stream].runtime = NULL;
+}
+
+static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
+	int ret;
+
+	snd_soc_dpcm_mutex_lock(fe);
+	ret = dpcm_fe_dai_shutdown(fe_substream);
+
+	dpcm_fe_dai_cleanup(fe_substream);
+
+	snd_soc_dpcm_mutex_unlock(fe);
+	return ret;
+}
+
+static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
+{
+	struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
+	struct snd_soc_dapm_widget_list *list;
+	int ret;
+	int stream = fe_substream->stream;
+
+	snd_soc_dpcm_mutex_lock(fe);
+	fe->dpcm[stream].runtime = fe_substream->runtime;
+
+	ret = dpcm_path_get(fe, stream, &list);
+	if (ret < 0)
+		goto open_end;
+
+	/* calculate valid and active FE <-> BE dpcms */
+	dpcm_process_paths(fe, stream, &list, 1);
+
+	ret = dpcm_fe_dai_startup(fe_substream);
+	if (ret < 0)
+		dpcm_fe_dai_cleanup(fe_substream);
+
+	dpcm_clear_pending_state(fe, stream);
+	dpcm_path_put(&list);
+open_end:
+	snd_soc_dpcm_mutex_unlock(fe);
+	return ret;
+}
+
+static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
+				    int *playback, int *capture)
+{
+	struct snd_soc_dai *cpu_dai;
+	int i;
+
+	if (rtd->dai_link->dynamic && rtd->dai_link->num_cpus > 1) {
+		dev_err(rtd->dev,
+			"DPCM doesn't support Multi CPU for Front-Ends yet\n");
+		return -EINVAL;
+	}
+
+	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
+		int stream;
+
+		if (rtd->dai_link->dpcm_playback) {
+			stream = SNDRV_PCM_STREAM_PLAYBACK;
+
+			for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+				if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
+					*playback = 1;
+					break;
+				}
+			}
+			if (!*playback) {
+				dev_err(rtd->card->dev,
+					"No CPU DAIs support playback for stream %s\n",
+					rtd->dai_link->stream_name);
+				return -EINVAL;
+			}
+		}
+		if (rtd->dai_link->dpcm_capture) {
+			stream = SNDRV_PCM_STREAM_CAPTURE;
+
+			for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+				if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
+					*capture = 1;
+					break;
+				}
+			}
+
+			if (!*capture) {
+				dev_err(rtd->card->dev,
+					"No CPU DAIs support capture for stream %s\n",
+					rtd->dai_link->stream_name);
+				return -EINVAL;
+			}
+		}
+	} else {
+		struct snd_soc_dai *codec_dai;
+
+		/* Adapt stream for codec2codec links */
+		int cpu_capture = rtd->dai_link->params ?
+			SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
+		int cpu_playback = rtd->dai_link->params ?
+			SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
+
+		for_each_rtd_codec_dais(rtd, i, codec_dai) {
+			if (rtd->dai_link->num_cpus == 1) {
+				cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+			} else if (rtd->dai_link->num_cpus == rtd->dai_link->num_codecs) {
+				cpu_dai = asoc_rtd_to_cpu(rtd, i);
+			} else {
+				dev_err(rtd->card->dev,
+					"N cpus to M codecs link is not supported yet\n");
+				return -EINVAL;
+			}
+
+			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
+			    snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
+				*playback = 1;
+			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
+			    snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
+				*capture = 1;
+		}
+	}
+
+	if (rtd->dai_link->playback_only) {
+		*playback = 1;
+		*capture = 0;
+	}
+
+	if (rtd->dai_link->capture_only) {
+		*playback = 0;
+		*capture = 1;
+	}
+
+	return 0;
+}
+
+static int soc_create_pcm(struct snd_pcm **pcm,
+			  struct snd_soc_pcm_runtime *rtd,
+			  int playback, int capture, int num)
+{
+	char new_name[64];
+	int ret;
+
+	/* create the PCM */
+	if (rtd->dai_link->params) {
+		snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
+			 rtd->dai_link->stream_name);
+
+		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
+					   playback, capture, pcm);
+	} else if (rtd->dai_link->no_pcm) {
+		snprintf(new_name, sizeof(new_name), "(%s)",
+			rtd->dai_link->stream_name);
+
+		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
+				playback, capture, pcm);
+	} else {
+		if (rtd->dai_link->dynamic)
+			snprintf(new_name, sizeof(new_name), "%s (*)",
+				rtd->dai_link->stream_name);
+		else
+			snprintf(new_name, sizeof(new_name), "%s %s-%d",
+				rtd->dai_link->stream_name,
+				soc_codec_dai_name(rtd), num);
+
+		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
+			capture, pcm);
+	}
+	if (ret < 0) {
+		dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
+			new_name, rtd->dai_link->name, ret);
+		return ret;
+	}
+	dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
+
+	return 0;
+}
+
+/* create a new pcm */
+int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
+{
+	struct snd_soc_component *component;
+	struct snd_pcm *pcm;
+	int ret = 0, playback = 0, capture = 0;
+	int i;
+
+	ret = soc_get_playback_capture(rtd, &playback, &capture);
+	if (ret < 0)
+		return ret;
+
+	ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
+	if (ret < 0)
+		return ret;
+
+	/* DAPM dai link stream work */
+	/*
+	 * Currently nothing to do for c2c links
+	 * Since c2c links are internal nodes in the DAPM graph and
+	 * don't interface with the outside world or application layer
+	 * we don't have to do any special handling on close.
+	 */
+	if (!rtd->dai_link->params)
+		rtd->close_delayed_work_func = snd_soc_close_delayed_work;
+
+	rtd->pcm = pcm;
+	pcm->nonatomic = rtd->dai_link->nonatomic;
+	pcm->private_data = rtd;
+	pcm->no_device_suspend = true;
+
+	if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
+		if (playback)
+			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
+		if (capture)
+			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
+		goto out;
+	}
+
+	/* ASoC PCM operations */
+	if (rtd->dai_link->dynamic) {
+		rtd->ops.open		= dpcm_fe_dai_open;
+		rtd->ops.hw_params	= dpcm_fe_dai_hw_params;
+		rtd->ops.prepare	= dpcm_fe_dai_prepare;
+		rtd->ops.trigger	= dpcm_fe_dai_trigger;
+		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
+		rtd->ops.close		= dpcm_fe_dai_close;
+		rtd->ops.pointer	= soc_pcm_pointer;
+	} else {
+		rtd->ops.open		= soc_pcm_open;
+		rtd->ops.hw_params	= soc_pcm_hw_params;
+		rtd->ops.prepare	= soc_pcm_prepare;
+		rtd->ops.trigger	= soc_pcm_trigger;
+		rtd->ops.hw_free	= soc_pcm_hw_free;
+		rtd->ops.close		= soc_pcm_close;
+		rtd->ops.pointer	= soc_pcm_pointer;
+	}
+
+	for_each_rtd_components(rtd, i, component) {
+		const struct snd_soc_component_driver *drv = component->driver;
+
+		if (drv->ioctl)
+			rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
+		if (drv->sync_stop)
+			rtd->ops.sync_stop	= snd_soc_pcm_component_sync_stop;
+		if (drv->copy_user)
+			rtd->ops.copy_user	= snd_soc_pcm_component_copy_user;
+		if (drv->page)
+			rtd->ops.page		= snd_soc_pcm_component_page;
+		if (drv->mmap)
+			rtd->ops.mmap		= snd_soc_pcm_component_mmap;
+		if (drv->ack)
+			rtd->ops.ack            = snd_soc_pcm_component_ack;
+	}
+
+	if (playback)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
+
+	if (capture)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
+
+	ret = snd_soc_pcm_component_new(rtd);
+	if (ret < 0)
+		return ret;
+out:
+	dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
+		soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
+	return ret;
+}
+
+/* is the current PCM operation for this FE ? */
+int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
+{
+	if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
+		return 1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
+
+/* is the current PCM operation for this BE ? */
+int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
+		struct snd_soc_pcm_runtime *be, int stream)
+{
+	if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
+	   ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
+		  be->dpcm[stream].runtime_update))
+		return 1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
+
+/* get the substream for this BE */
+struct snd_pcm_substream *
+	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
+{
+	return be->pcm->streams[stream].substream;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
+
+static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
+				    struct snd_soc_pcm_runtime *be,
+				    int stream,
+				    const enum snd_soc_dpcm_state *states,
+				    int num_states)
+{
+	struct snd_soc_dpcm *dpcm;
+	int state;
+	int ret = 1;
+	int i;
+
+	for_each_dpcm_fe(be, stream, dpcm) {
+
+		if (dpcm->fe == fe)
+			continue;
+
+		state = dpcm->fe->dpcm[stream].state;
+		for (i = 0; i < num_states; i++) {
+			if (state == states[i]) {
+				ret = 0;
+				break;
+			}
+		}
+	}
+
+	/* it's safe to do this BE DAI */
+	return ret;
+}
+
+/*
+ * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
+ * are not running, paused or suspended for the specified stream direction.
+ */
+int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
+		struct snd_soc_pcm_runtime *be, int stream)
+{
+	const enum snd_soc_dpcm_state state[] = {
+		SND_SOC_DPCM_STATE_START,
+		SND_SOC_DPCM_STATE_PAUSED,
+		SND_SOC_DPCM_STATE_SUSPEND,
+	};
+
+	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
+
+/*
+ * We can only change hw params a BE DAI if any of it's FE are not prepared,
+ * running, paused or suspended for the specified stream direction.
+ */
+int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
+		struct snd_soc_pcm_runtime *be, int stream)
+{
+	const enum snd_soc_dpcm_state state[] = {
+		SND_SOC_DPCM_STATE_START,
+		SND_SOC_DPCM_STATE_PAUSED,
+		SND_SOC_DPCM_STATE_SUSPEND,
+		SND_SOC_DPCM_STATE_PREPARE,
+	};
+
+	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
+
+/*
+ * We can only prepare a BE DAI if any of it's FE are not prepared,
+ * running or paused for the specified stream direction.
+ */
+int snd_soc_dpcm_can_be_prepared(struct snd_soc_pcm_runtime *fe,
+				 struct snd_soc_pcm_runtime *be, int stream)
+{
+	const enum snd_soc_dpcm_state state[] = {
+		SND_SOC_DPCM_STATE_START,
+		SND_SOC_DPCM_STATE_PAUSED,
+		SND_SOC_DPCM_STATE_PREPARE,
+	};
+
+	return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_prepared);