sound/soc/meson/aiu-encoder-i2s.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // Copyright (c) 2020 BayLibre, SAS.
 // Author: Jerome Brunet <jbrunet@baylibre.com>

 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dai.h>

 #include "aiu.h"

 #define AIU_I2S_SOURCE_DESC_MODE_8CH	BIT(0)
 #define AIU_I2S_SOURCE_DESC_MODE_24BIT	BIT(5)
 #define AIU_I2S_SOURCE_DESC_MODE_32BIT	BIT(9)
 #define AIU_I2S_SOURCE_DESC_MODE_SPLIT	BIT(11)
 #define AIU_RST_SOFT_I2S_FAST		BIT(0)

 #define AIU_I2S_DAC_CFG_MSB_FIRST	BIT(2)
 #define AIU_I2S_MISC_HOLD_EN		BIT(2)
 #define AIU_CLK_CTRL_I2S_DIV_EN		BIT(0)
 #define AIU_CLK_CTRL_I2S_DIV		GENMASK(3, 2)
 #define AIU_CLK_CTRL_AOCLK_INVERT	BIT(6)
 #define AIU_CLK_CTRL_LRCLK_INVERT	BIT(7)
 #define AIU_CLK_CTRL_LRCLK_SKEW		GENMASK(9, 8)
 #define AIU_CLK_CTRL_MORE_HDMI_AMCLK	BIT(6)
 #define AIU_CLK_CTRL_MORE_I2S_DIV	GENMASK(5, 0)
 #define AIU_CODEC_DAC_LRCLK_CTRL_DIV	GENMASK(11, 0)

 static void aiu_encoder_i2s_divider_enable(struct snd_soc_component *component,
 					   bool enable)
 {
 	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
 				      AIU_CLK_CTRL_I2S_DIV_EN,
 				      enable ? AIU_CLK_CTRL_I2S_DIV_EN : 0);
 }

 static void aiu_encoder_i2s_hold(struct snd_soc_component *component,
 				 bool enable)
 {
 	snd_soc_component_update_bits(component, AIU_I2S_MISC,
 				      AIU_I2S_MISC_HOLD_EN,
 				      enable ? AIU_I2S_MISC_HOLD_EN : 0);
 }

 static int aiu_encoder_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 				   struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *component = dai->component;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		aiu_encoder_i2s_hold(component, false);
 		return 0;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		aiu_encoder_i2s_hold(component, true);
 		return 0;

 	default:
 		return -EINVAL;
 	}
 }

 static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
 				      struct snd_pcm_hw_params *params)
 {
 	/* Always operate in split (classic interleaved) mode */
 	unsigned int desc = AIU_I2S_SOURCE_DESC_MODE_SPLIT;

 	/* Reset required to update the pipeline */
 	snd_soc_component_write(component, AIU_RST_SOFT, AIU_RST_SOFT_I2S_FAST);
 	snd_soc_component_read(component, AIU_I2S_SYNC);

 	switch (params_physical_width(params)) {
 	case 16: /* Nothing to do */
 		break;

 	case 32:
 		desc |= (AIU_I2S_SOURCE_DESC_MODE_24BIT |
 			 AIU_I2S_SOURCE_DESC_MODE_32BIT);
 		break;

 	default:
 		return -EINVAL;
 	}

 	switch (params_channels(params)) {
 	case 2: /* Nothing to do */
 		break;
 	case 8:
 		desc |= AIU_I2S_SOURCE_DESC_MODE_8CH;
 		break;
 	default:
 		return -EINVAL;
 	}

 	snd_soc_component_update_bits(component, AIU_I2S_SOURCE_DESC,
 				      AIU_I2S_SOURCE_DESC_MODE_8CH |
 				      AIU_I2S_SOURCE_DESC_MODE_24BIT |
 				      AIU_I2S_SOURCE_DESC_MODE_32BIT |
 				      AIU_I2S_SOURCE_DESC_MODE_SPLIT,
 				      desc);

 	return 0;
 }

 static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
 					  struct snd_pcm_hw_params *params,
 					  unsigned int bs)
 {
 	switch (bs) {
 	case 1:
 	case 2:
 	case 4:
 	case 8:
 		/* These are the only valid legacy dividers */
 		break;

 	default:
 		dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
 		return -EINVAL;
 	}

 	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
 				      AIU_CLK_CTRL_I2S_DIV,
 				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
 						 __ffs(bs)));

 	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
 				      AIU_CLK_CTRL_MORE_I2S_DIV,
 				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
 						 0));

 	return 0;
 }

 static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
 					struct snd_pcm_hw_params *params,
 					unsigned int bs)
 {
 	/*
 	 * NOTE: this HW is odd.
 	 * In most configuration, the i2s divider is 'mclk / blck'.
 	 * However, in 16 bits - 8ch mode, this factor needs to be
 	 * increased by 50% to get the correct output rate.
 	 * No idea why !
 	 */
 	if (params_width(params) == 16 && params_channels(params) == 8) {
 		if (bs % 2) {
 			dev_err(component->dev,
 				"Cannot increase i2s divider by 50%%\n");
 			return -EINVAL;
 		}
 		bs += bs / 2;
 	}

 	/* Use CLK_MORE for mclk to bclk divider */
 	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
 				      AIU_CLK_CTRL_I2S_DIV,
 				      FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));

 	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
 				      AIU_CLK_CTRL_MORE_I2S_DIV,
 				      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
 						 bs - 1));

 	return 0;
 }

 static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
 				      struct snd_pcm_hw_params *params)
 {
 	struct aiu *aiu = snd_soc_component_get_drvdata(component);
 	unsigned int srate = params_rate(params);
 	unsigned int fs, bs;
 	int ret;

 	/* Get the oversampling factor */
 	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);

 	if (fs % 64)
 		return -EINVAL;

 	/* Send data MSB first */
 	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
 				      AIU_I2S_DAC_CFG_MSB_FIRST,
 				      AIU_I2S_DAC_CFG_MSB_FIRST);

 	/* Set bclk to lrlck ratio */
 	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
 				      AIU_CODEC_DAC_LRCLK_CTRL_DIV,
 				      FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
 						 64 - 1));

 	bs = fs / 64;

 	if (aiu->platform->has_clk_ctrl_more_i2s_div)
 		ret = aiu_encoder_i2s_set_more_div(component, params, bs);
 	else
 		ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);

 	if (ret)
 		return ret;

 	/* Make sure amclk is used for HDMI i2s as well */
 	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
 				      AIU_CLK_CTRL_MORE_HDMI_AMCLK,
 				      AIU_CLK_CTRL_MORE_HDMI_AMCLK);

 	return 0;
 }

 static int aiu_encoder_i2s_hw_params(struct snd_pcm_substream *substream,
 				     struct snd_pcm_hw_params *params,
 				     struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *component = dai->component;
 	int ret;

 	/* Disable the clock while changing the settings */
 	aiu_encoder_i2s_divider_enable(component, false);

 	ret = aiu_encoder_i2s_setup_desc(component, params);
 	if (ret) {
 		dev_err(dai->dev, "setting i2s desc failed\n");
 		return ret;
 	}

 	ret = aiu_encoder_i2s_set_clocks(component, params);
 	if (ret) {
 		dev_err(dai->dev, "setting i2s clocks failed\n");
 		return ret;
 	}

 	aiu_encoder_i2s_divider_enable(component, true);

 	return 0;
 }

 static int aiu_encoder_i2s_hw_free(struct snd_pcm_substream *substream,
 				   struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *component = dai->component;

 	aiu_encoder_i2s_divider_enable(component, false);

 	return 0;
 }

 static int aiu_encoder_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct snd_soc_component *component = dai->component;
 	unsigned int inv = fmt & SND_SOC_DAIFMT_INV_MASK;
 	unsigned int val = 0;
 	unsigned int skew;

 	/* Only CPU Master / Codec Slave supported ATM */
 	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 		return -EINVAL;

 	if (inv == SND_SOC_DAIFMT_NB_IF ||
 	    inv == SND_SOC_DAIFMT_IB_IF)
 		val |= AIU_CLK_CTRL_LRCLK_INVERT;

 	if (inv == SND_SOC_DAIFMT_IB_NF ||
 	    inv == SND_SOC_DAIFMT_IB_IF)
 		val |= AIU_CLK_CTRL_AOCLK_INVERT;

 	/* Signal skew */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		/* Invert sample clock for i2s */
 		val ^= AIU_CLK_CTRL_LRCLK_INVERT;
 		skew = 1;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		skew = 0;
 		break;
 	default:
 		return -EINVAL;
 	}

 	val |= FIELD_PREP(AIU_CLK_CTRL_LRCLK_SKEW, skew);
 	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
 				      AIU_CLK_CTRL_LRCLK_INVERT |
 				      AIU_CLK_CTRL_AOCLK_INVERT |
 				      AIU_CLK_CTRL_LRCLK_SKEW,
 				      val);

 	return 0;
 }

 static int aiu_encoder_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 				      unsigned int freq, int dir)
 {
 	struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
 	int ret;

 	if (WARN_ON(clk_id != 0))
 		return -EINVAL;

 	if (dir == SND_SOC_CLOCK_IN)
 		return 0;

 	ret = clk_set_rate(aiu->i2s.clks[MCLK].clk, freq);
 	if (ret)
 		dev_err(dai->dev, "Failed to set sysclk to %uHz", freq);

 	return ret;
 }

 static const unsigned int hw_channels[] = {2, 8};
 static const struct snd_pcm_hw_constraint_list hw_channel_constraints = {
 	.list = hw_channels,
 	.count = ARRAY_SIZE(hw_channels),
 	.mask = 0,
 };

 static int aiu_encoder_i2s_startup(struct snd_pcm_substream *substream,
 				   struct snd_soc_dai *dai)
 {
 	struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
 	int ret;

 	/* Make sure the encoder gets either 2 or 8 channels */
 	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
 					 SNDRV_PCM_HW_PARAM_CHANNELS,
 					 &hw_channel_constraints);
 	if (ret) {
 		dev_err(dai->dev, "adding channels constraints failed\n");
 		return ret;
 	}

 	ret = clk_bulk_prepare_enable(aiu->i2s.clk_num, aiu->i2s.clks);
 	if (ret)
 		dev_err(dai->dev, "failed to enable i2s clocks\n");

 	return ret;
 }

 static void aiu_encoder_i2s_shutdown(struct snd_pcm_substream *substream,
 				     struct snd_soc_dai *dai)
 {
 	struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);

 	clk_bulk_disable_unprepare(aiu->i2s.clk_num, aiu->i2s.clks);
 }

 const struct snd_soc_dai_ops aiu_encoder_i2s_dai_ops = {
 	.trigger	= aiu_encoder_i2s_trigger,
 	.hw_params	= aiu_encoder_i2s_hw_params,
 	.hw_free	= aiu_encoder_i2s_hw_free,
 	.set_fmt	= aiu_encoder_i2s_set_fmt,
 	.set_sysclk	= aiu_encoder_i2s_set_sysclk,
 	.startup	= aiu_encoder_i2s_startup,
 	.shutdown	= aiu_encoder_i2s_shutdown,
 };
	// SPDX-License-Identifier: GPL-2.0
	//
	// Copyright (c) 2020 BayLibre, SAS.
	// Author: Jerome Brunet <jbrunet@baylibre.com>

	#include <linux/bitfield.h>
	#include <linux/clk.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/soc-dai.h>

	#include "aiu.h"

	#define AIU_I2S_SOURCE_DESC_MODE_8CH BIT(0)
	#define AIU_I2S_SOURCE_DESC_MODE_24BIT BIT(5)
	#define AIU_I2S_SOURCE_DESC_MODE_32BIT BIT(9)
	#define AIU_I2S_SOURCE_DESC_MODE_SPLIT BIT(11)
	#define AIU_RST_SOFT_I2S_FAST BIT(0)

	#define AIU_I2S_DAC_CFG_MSB_FIRST BIT(2)
	#define AIU_I2S_MISC_HOLD_EN BIT(2)
	#define AIU_CLK_CTRL_I2S_DIV_EN BIT(0)
	#define AIU_CLK_CTRL_I2S_DIV GENMASK(3, 2)
	#define AIU_CLK_CTRL_AOCLK_INVERT BIT(6)
	#define AIU_CLK_CTRL_LRCLK_INVERT BIT(7)
	#define AIU_CLK_CTRL_LRCLK_SKEW GENMASK(9, 8)
	#define AIU_CLK_CTRL_MORE_HDMI_AMCLK BIT(6)
	#define AIU_CLK_CTRL_MORE_I2S_DIV GENMASK(5, 0)
	#define AIU_CODEC_DAC_LRCLK_CTRL_DIV GENMASK(11, 0)

	static void aiu_encoder_i2s_divider_enable(struct snd_soc_component *component,
	bool enable)
	{
	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
	AIU_CLK_CTRL_I2S_DIV_EN,
	enable ? AIU_CLK_CTRL_I2S_DIV_EN : 0);
	}

	static void aiu_encoder_i2s_hold(struct snd_soc_component *component,
	bool enable)
	{
	snd_soc_component_update_bits(component, AIU_I2S_MISC,
	AIU_I2S_MISC_HOLD_EN,
	enable ? AIU_I2S_MISC_HOLD_EN : 0);
	}

	static int aiu_encoder_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_component *component = dai->component;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	aiu_encoder_i2s_hold(component, false);
	return 0;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	aiu_encoder_i2s_hold(component, true);
	return 0;

	default:
	return -EINVAL;
	}
	}

	static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
	struct snd_pcm_hw_params *params)
	{
	/* Always operate in split (classic interleaved) mode */
	unsigned int desc = AIU_I2S_SOURCE_DESC_MODE_SPLIT;

	/* Reset required to update the pipeline */
	snd_soc_component_write(component, AIU_RST_SOFT, AIU_RST_SOFT_I2S_FAST);
	snd_soc_component_read(component, AIU_I2S_SYNC);

	switch (params_physical_width(params)) {
	case 16: /* Nothing to do */
	break;

	case 32:
	desc \|= (AIU_I2S_SOURCE_DESC_MODE_24BIT \|
	AIU_I2S_SOURCE_DESC_MODE_32BIT);
	break;

	default:
	return -EINVAL;
	}

	switch (params_channels(params)) {
	case 2: /* Nothing to do */
	break;
	case 8:
	desc \|= AIU_I2S_SOURCE_DESC_MODE_8CH;
	break;
	default:
	return -EINVAL;
	}

	snd_soc_component_update_bits(component, AIU_I2S_SOURCE_DESC,
	AIU_I2S_SOURCE_DESC_MODE_8CH \|
	AIU_I2S_SOURCE_DESC_MODE_24BIT \|
	AIU_I2S_SOURCE_DESC_MODE_32BIT \|
	AIU_I2S_SOURCE_DESC_MODE_SPLIT,
	desc);

	return 0;
	}

	static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
	struct snd_pcm_hw_params *params,
	unsigned int bs)
	{
	switch (bs) {
	case 1:
	case 2:
	case 4:
	case 8:
	/* These are the only valid legacy dividers */
	break;

	default:
	dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
	return -EINVAL;
	}

	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
	AIU_CLK_CTRL_I2S_DIV,
	FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
	__ffs(bs)));

	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
	AIU_CLK_CTRL_MORE_I2S_DIV,
	FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
	0));

	return 0;
	}

	static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
	struct snd_pcm_hw_params *params,
	unsigned int bs)
	{
	/*
	* NOTE: this HW is odd.
	* In most configuration, the i2s divider is 'mclk / blck'.
	* However, in 16 bits - 8ch mode, this factor needs to be
	* increased by 50% to get the correct output rate.
	* No idea why !
	*/
	if (params_width(params) == 16 && params_channels(params) == 8) {
	if (bs % 2) {
	dev_err(component->dev,
	"Cannot increase i2s divider by 50%%\n");
	return -EINVAL;
	}
	bs += bs / 2;
	}

	/* Use CLK_MORE for mclk to bclk divider */
	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
	AIU_CLK_CTRL_I2S_DIV,
	FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));

	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
	AIU_CLK_CTRL_MORE_I2S_DIV,
	FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
	bs - 1));

	return 0;
	}

	static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
	struct snd_pcm_hw_params *params)
	{
	struct aiu *aiu = snd_soc_component_get_drvdata(component);
	unsigned int srate = params_rate(params);
	unsigned int fs, bs;
	int ret;

	/* Get the oversampling factor */
	fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);

	if (fs % 64)
	return -EINVAL;

	/* Send data MSB first */
	snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
	AIU_I2S_DAC_CFG_MSB_FIRST,
	AIU_I2S_DAC_CFG_MSB_FIRST);

	/* Set bclk to lrlck ratio */
	snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
	AIU_CODEC_DAC_LRCLK_CTRL_DIV,
	FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
	64 - 1));

	bs = fs / 64;

	if (aiu->platform->has_clk_ctrl_more_i2s_div)
	ret = aiu_encoder_i2s_set_more_div(component, params, bs);
	else
	ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);

	if (ret)
	return ret;

	/* Make sure amclk is used for HDMI i2s as well */
	snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
	AIU_CLK_CTRL_MORE_HDMI_AMCLK,
	AIU_CLK_CTRL_MORE_HDMI_AMCLK);

	return 0;
	}

	static int aiu_encoder_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_component *component = dai->component;
	int ret;

	/* Disable the clock while changing the settings */
	aiu_encoder_i2s_divider_enable(component, false);

	ret = aiu_encoder_i2s_setup_desc(component, params);
	if (ret) {
	dev_err(dai->dev, "setting i2s desc failed\n");
	return ret;
	}

	ret = aiu_encoder_i2s_set_clocks(component, params);
	if (ret) {
	dev_err(dai->dev, "setting i2s clocks failed\n");
	return ret;
	}

	aiu_encoder_i2s_divider_enable(component, true);

	return 0;
	}

	static int aiu_encoder_i2s_hw_free(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_component *component = dai->component;

	aiu_encoder_i2s_divider_enable(component, false);

	return 0;
	}

	static int aiu_encoder_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
	{
	struct snd_soc_component *component = dai->component;
	unsigned int inv = fmt & SND_SOC_DAIFMT_INV_MASK;
	unsigned int val = 0;
	unsigned int skew;

	/* Only CPU Master / Codec Slave supported ATM */
	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
	return -EINVAL;

	if (inv == SND_SOC_DAIFMT_NB_IF \|\|
	inv == SND_SOC_DAIFMT_IB_IF)
	val \|= AIU_CLK_CTRL_LRCLK_INVERT;

	if (inv == SND_SOC_DAIFMT_IB_NF \|\|
	inv == SND_SOC_DAIFMT_IB_IF)
	val \|= AIU_CLK_CTRL_AOCLK_INVERT;

	/* Signal skew */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	/* Invert sample clock for i2s */
	val ^= AIU_CLK_CTRL_LRCLK_INVERT;
	skew = 1;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	skew = 0;
	break;
	default:
	return -EINVAL;
	}

	val \|= FIELD_PREP(AIU_CLK_CTRL_LRCLK_SKEW, skew);
	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
	AIU_CLK_CTRL_LRCLK_INVERT \|
	AIU_CLK_CTRL_AOCLK_INVERT \|
	AIU_CLK_CTRL_LRCLK_SKEW,
	val);

	return 0;
	}

	static int aiu_encoder_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
	unsigned int freq, int dir)
	{
	struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
	int ret;

	if (WARN_ON(clk_id != 0))
	return -EINVAL;

	if (dir == SND_SOC_CLOCK_IN)
	return 0;

	ret = clk_set_rate(aiu->i2s.clks[MCLK].clk, freq);
	if (ret)
	dev_err(dai->dev, "Failed to set sysclk to %uHz", freq);

	return ret;
	}

	static const unsigned int hw_channels[] = {2, 8};
	static const struct snd_pcm_hw_constraint_list hw_channel_constraints = {
	.list = hw_channels,
	.count = ARRAY_SIZE(hw_channels),
	.mask = 0,
	};

	static int aiu_encoder_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
	int ret;

	/* Make sure the encoder gets either 2 or 8 channels */
	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_CHANNELS,
	&hw_channel_constraints);
	if (ret) {
	dev_err(dai->dev, "adding channels constraints failed\n");
	return ret;
	}

	ret = clk_bulk_prepare_enable(aiu->i2s.clk_num, aiu->i2s.clks);
	if (ret)
	dev_err(dai->dev, "failed to enable i2s clocks\n");

	return ret;
	}

	static void aiu_encoder_i2s_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);

	clk_bulk_disable_unprepare(aiu->i2s.clk_num, aiu->i2s.clks);
	}

	const struct snd_soc_dai_ops aiu_encoder_i2s_dai_ops = {
	.trigger = aiu_encoder_i2s_trigger,
	.hw_params = aiu_encoder_i2s_hw_params,
	.hw_free = aiu_encoder_i2s_hw_free,
	.set_fmt = aiu_encoder_i2s_set_fmt,
	.set_sysclk = aiu_encoder_i2s_set_sysclk,
	.startup = aiu_encoder_i2s_startup,
	.shutdown = aiu_encoder_i2s_shutdown,
	};