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Release 4.7 sound/soc/sti/uniperif_player.c

Directory: sound/soc/sti
/*
 * Copyright (C) STMicroelectronics SA 2015
 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
 *          for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>

#include <sound/asoundef.h>
#include <sound/soc.h>

#include "uniperif.h"

/*
 * Some hardware-related definitions
 */

/* sys config registers definitions */

#define SYS_CFG_AUDIO_GLUE 0xA4

/*
 * Driver specific types.
 */


#define UNIPERIF_PLAYER_CLK_ADJ_MIN  -999999

#define UNIPERIF_PLAYER_CLK_ADJ_MAX  1000000

#define UNIPERIF_PLAYER_I2S_OUT 1 
/* player id connected to I2S/TDM TX bus */

/*
 * Note: snd_pcm_hardware is linked to DMA controller but is declared here to
 * integrate  DAI_CPU capability in term of rate and supported channels
 */

static const struct snd_pcm_hardware uni_player_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,

	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.rate_min = 8000,
	.rate_max = 192000,

	.channels_min = 2,
	.channels_max = 8,

	.periods_min = 2,
	.periods_max = 48,

	.period_bytes_min = 128,
	.period_bytes_max = 64 * PAGE_SIZE,
	.buffer_bytes_max = 256 * PAGE_SIZE
};


static inline int reset_player(struct uniperif *player) { int count = 10; if (player->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) { while (GET_UNIPERIF_SOFT_RST_SOFT_RST(player) && count) { udelay(5); count--; } } if (!count) { dev_err(player->dev, "Failed to reset uniperif"); return -EIO; } return 0; }

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/* * uni_player_irq_handler * In case of error audio stream is stopped; stop action is protected via PCM * stream lock to avoid race condition with trigger callback. */
static irqreturn_t uni_player_irq_handler(int irq, void *dev_id) { irqreturn_t ret = IRQ_NONE; struct uniperif *player = dev_id; unsigned int status; unsigned int tmp; if (player->state == UNIPERIF_STATE_STOPPED) { /* Unexpected IRQ: do nothing */ return IRQ_NONE; } /* Get interrupt status & clear them immediately */ status = GET_UNIPERIF_ITS(player); SET_UNIPERIF_ITS_BCLR(player, status); /* Check for fifo error (underrun) */ if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(player))) { dev_err(player->dev, "FIFO underflow error detected"); /* Interrupt is just for information when underflow recovery */ if (player->info->underflow_enabled) { /* Update state to underflow */ player->state = UNIPERIF_STATE_UNDERFLOW; } else { /* Disable interrupt so doesn't continually fire */ SET_UNIPERIF_ITM_BCLR_FIFO_ERROR(player); /* Stop the player */ snd_pcm_stream_lock(player->substream); snd_pcm_stop(player->substream, SNDRV_PCM_STATE_XRUN); snd_pcm_stream_unlock(player->substream); } ret = IRQ_HANDLED; } /* Check for dma error (overrun) */ if (unlikely(status & UNIPERIF_ITS_DMA_ERROR_MASK(player))) { dev_err(player->dev, "DMA error detected"); /* Disable interrupt so doesn't continually fire */ SET_UNIPERIF_ITM_BCLR_DMA_ERROR(player); /* Stop the player */ snd_pcm_stream_lock(player->substream); snd_pcm_stop(player->substream, SNDRV_PCM_STATE_XRUN); snd_pcm_stream_unlock(player->substream); ret = IRQ_HANDLED; } /* Check for underflow recovery done */ if (unlikely(status & UNIPERIF_ITM_UNDERFLOW_REC_DONE_MASK(player))) { if (!player->info->underflow_enabled) { dev_err(player->dev, "unexpected Underflow recovering"); return -EPERM; } /* Read the underflow recovery duration */ tmp = GET_UNIPERIF_STATUS_1_UNDERFLOW_DURATION(player); /* Clear the underflow recovery duration */ SET_UNIPERIF_BIT_CONTROL_CLR_UNDERFLOW_DURATION(player); /* Update state to started */ player->state = UNIPERIF_STATE_STARTED; ret = IRQ_HANDLED; } /* Check if underflow recovery failed */ if (unlikely(status & UNIPERIF_ITM_UNDERFLOW_REC_FAILED_MASK(player))) { dev_err(player->dev, "Underflow recovery failed"); /* Stop the player */ snd_pcm_stream_lock(player->substream); snd_pcm_stop(player->substream, SNDRV_PCM_STATE_XRUN); snd_pcm_stream_unlock(player->substream); ret = IRQ_HANDLED; } return ret; }

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static int uni_player_clk_set_rate(struct uniperif *player, unsigned long rate) { int rate_adjusted, rate_achieved, delta, ret; int adjustment = player->clk_adj; /* * a * F = f + --------- * f = f + d * 1000000 * * a * d = --------- * f * 1000000 * * where: * f - nominal rate * a - adjustment in ppm (parts per milion) * F - rate to be set in synthesizer * d - delta (difference) between f and F */ if (adjustment < 0) { /* div64_64 operates on unsigned values... */ delta = -1; adjustment = -adjustment; } else { delta = 1; } /* 500000 ppm is 0.5, which is used to round up values */ delta *= (int)div64_u64((uint64_t)rate * (uint64_t)adjustment + 500000, 1000000); rate_adjusted = rate + delta; /* Adjusted rate should never be == 0 */ if (!rate_adjusted) return -EINVAL; ret = clk_set_rate(player->clk, rate_adjusted); if (ret < 0) return ret; rate_achieved = clk_get_rate(player->clk); if (!rate_achieved) /* If value is 0 means that clock or parent not valid */ return -EINVAL; /* * Using ALSA's adjustment control, we can modify the rate to be up * to twice as much as requested, but no more */ delta = rate_achieved - rate; if (delta < 0) { /* div64_64 operates on unsigned values... */ delta = -delta; adjustment = -1; } else { adjustment = 1; } /* Frequency/2 is added to round up result */ adjustment *= (int)div64_u64((uint64_t)delta * 1000000 + rate / 2, rate); player->clk_adj = adjustment; return 0; }

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static void uni_player_set_channel_status(struct uniperif *player, struct snd_pcm_runtime *runtime) { int n; unsigned int status; /* * Some AVRs and TVs require the channel status to contain a correct * sampling frequency. If no sample rate is already specified, then * set one. */ mutex_lock(&player->ctrl_lock); if (runtime) { switch (runtime->rate) { case 22050: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_22050; break; case 44100: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_44100; break; case 88200: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_88200; break; case 176400: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_176400; break; case 24000: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_24000; break; case 48000: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_48000; break; case 96000: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_96000; break; case 192000: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_192000; break; case 32000: player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_32000; break; default: /* Mark as sampling frequency not indicated */ player->stream_settings.iec958.status[3] = IEC958_AES3_CON_FS_NOTID; break; } } /* Audio mode: * Use audio mode status to select PCM or encoded mode */ if (player->stream_settings.iec958.status[0] & IEC958_AES0_NONAUDIO) player->stream_settings.encoding_mode = UNIPERIF_IEC958_ENCODING_MODE_ENCODED; else player->stream_settings.encoding_mode = UNIPERIF_IEC958_ENCODING_MODE_PCM; if (player->stream_settings.encoding_mode == UNIPERIF_IEC958_ENCODING_MODE_PCM) /* Clear user validity bits */ SET_UNIPERIF_USER_VALIDITY_VALIDITY_LR(player, 0); else /* Set user validity bits */ SET_UNIPERIF_USER_VALIDITY_VALIDITY_LR(player, 1); /* Program the new channel status */ for (n = 0; n < 6; ++n) { status = player->stream_settings.iec958.status[0 + (n * 4)] & 0xf; status |= player->stream_settings.iec958.status[1 + (n * 4)] << 8; status |= player->stream_settings.iec958.status[2 + (n * 4)] << 16; status |= player->stream_settings.iec958.status[3 + (n * 4)] << 24; SET_UNIPERIF_CHANNEL_STA_REGN(player, n, status); } mutex_unlock(&player->ctrl_lock); /* Update the channel status */ if (player->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) SET_UNIPERIF_CONFIG_CHL_STS_UPDATE(player); else SET_UNIPERIF_BIT_CONTROL_CHL_STS_UPDATE(player); }

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static int uni_player_prepare_iec958(struct uniperif *player, struct snd_pcm_runtime *runtime) { int clk_div; clk_div = player->mclk / runtime->rate; /* Oversampling must be multiple of 128 as iec958 frame is 32-bits */ if ((clk_div % 128) || (clk_div <= 0)) { dev_err(player->dev, "%s: invalid clk_div %d", __func__, clk_div); return -EINVAL; } switch (runtime->format) { case SNDRV_PCM_FORMAT_S16_LE: /* 16/16 memory format */ SET_UNIPERIF_CONFIG_MEM_FMT_16_16(player); /* 16-bits per sub-frame */ SET_UNIPERIF_I2S_FMT_NBIT_32(player); /* Set 16-bit sample precision */ SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(player); break; case SNDRV_PCM_FORMAT_S32_LE: /* 16/0 memory format */ SET_UNIPERIF_CONFIG_MEM_FMT_16_0(player); /* 32-bits per sub-frame */ SET_UNIPERIF_I2S_FMT_NBIT_32(player); /* Set 24-bit sample precision */ SET_UNIPERIF_I2S_FMT_DATA_SIZE_24(player); break; default: dev_err(player->dev, "format not supported"); return -EINVAL; } /* Set parity to be calculated by the hardware */ SET_UNIPERIF_CONFIG_PARITY_CNTR_BY_HW(player); /* Set channel status bits to be inserted by the hardware */ SET_UNIPERIF_CONFIG_CHANNEL_STA_CNTR_BY_HW(player); /* Set user data bits to be inserted by the hardware */ SET_UNIPERIF_CONFIG_USER_DAT_CNTR_BY_HW(player); /* Set validity bits to be inserted by the hardware */ SET_UNIPERIF_CONFIG_VALIDITY_DAT_CNTR_BY_HW(player); /* Set full software control to disabled */ SET_UNIPERIF_CONFIG_SPDIF_SW_CTRL_DISABLE(player); SET_UNIPERIF_CTRL_ZERO_STUFF_HW(player); /* Update the channel status */ uni_player_set_channel_status(player, runtime); /* Clear the user validity user bits */ SET_UNIPERIF_USER_VALIDITY_VALIDITY_LR(player, 0); /* Disable one-bit audio mode */ SET_UNIPERIF_CONFIG_ONE_BIT_AUD_DISABLE(player); /* Enable consecutive frames repetition of Z preamble (not for HBRA) */ SET_UNIPERIF_CONFIG_REPEAT_CHL_STS_ENABLE(player); /* Change to SUF0_SUBF1 and left/right channels swap! */ SET_UNIPERIF_CONFIG_SUBFRAME_SEL_SUBF1_SUBF0(player); /* Set data output as MSB first */ SET_UNIPERIF_I2S_FMT_ORDER_MSB(player); if (player->stream_settings.encoding_mode == UNIPERIF_IEC958_ENCODING_MODE_ENCODED) SET_UNIPERIF_CTRL_EXIT_STBY_ON_EOBLOCK_ON(player); else SET_UNIPERIF_CTRL_EXIT_STBY_ON_EOBLOCK_OFF(player); SET_UNIPERIF_I2S_FMT_NUM_CH(player, runtime->channels / 2); /* Set rounding to off */ SET_UNIPERIF_CTRL_ROUNDING_OFF(player); /* Set clock divisor */ SET_UNIPERIF_CTRL_DIVIDER(player, clk_div / 128); /* Set the spdif latency to not wait before starting player */ SET_UNIPERIF_CTRL_SPDIF_LAT_OFF(player); /* * Ensure iec958 formatting is off. It will be enabled in function * uni_player_start() at the same time as the operation * mode is set to work around a silicon issue. */ if (player->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) SET_UNIPERIF_CTRL_SPDIF_FMT_OFF(player); else SET_UNIPERIF_CTRL_SPDIF_FMT_ON(player); return 0; }

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static int uni_player_prepare_pcm(struct uniperif *player, struct snd_pcm_runtime *runtime) { int output_frame_size, slot_width, clk_div; /* Force slot width to 32 in I2S mode (HW constraint) */ if ((player->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S) slot_width = 32; else slot_width = snd_pcm_format_width(runtime->format); output_frame_size = slot_width * runtime->channels; clk_div = player->mclk / runtime->rate; /* * For 32 bits subframe clk_div must be a multiple of 128, * for 16 bits must be a multiple of 64 */ if ((slot_width == 32) && (clk_div % 128)) { dev_err(player->dev, "%s: invalid clk_div", __func__); return -EINVAL; } if ((slot_width == 16) && (clk_div % 64)) { dev_err(player->dev, "%s: invalid clk_div", __func__); return -EINVAL; } /* * Number of bits per subframe (which is one channel sample) * on output - Transfer 16 or 32 bits from FIFO */ switch (slot_width) { case 32: SET_UNIPERIF_I2S_FMT_NBIT_32(player); SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(player); break; case 16: SET_UNIPERIF_I2S_FMT_NBIT_16(player); SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(player); break; default: dev_err(player->dev, "subframe format not supported"); return -EINVAL; } /* Configure data memory format */ switch (runtime->format) { case SNDRV_PCM_FORMAT_S16_LE: /* One data word contains two samples */ SET_UNIPERIF_CONFIG_MEM_FMT_16_16(player); break; case SNDRV_PCM_FORMAT_S32_LE: /* * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits * on the left than zeros (if less than 32 bytes)"... ;-) */ SET_UNIPERIF_CONFIG_MEM_FMT_16_0(player); break; default: dev_err(player->dev, "format not supported"); return -EINVAL; } /* Set rounding to off */ SET_UNIPERIF_CTRL_ROUNDING_OFF(player); /* Set clock divisor */ SET_UNIPERIF_CTRL_DIVIDER(player, clk_div / (2 * output_frame_size)); /* Number of channelsmust be even*/ if ((runtime->channels % 2) || (runtime->channels < 2) || (runtime->channels > 10)) { dev_err(player->dev, "%s: invalid nb of channels", __func__); return -EINVAL; } SET_UNIPERIF_I2S_FMT_NUM_CH(player, runtime->channels / 2); /* Set 1-bit audio format to disabled */ SET_UNIPERIF_CONFIG_ONE_BIT_AUD_DISABLE(player); SET_UNIPERIF_I2S_FMT_ORDER_MSB(player); /* No iec958 formatting as outputting to DAC */ SET_UNIPERIF_CTRL_SPDIF_FMT_OFF(player); return 0; }

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static int uni_player_prepare_tdm(struct uniperif *player, struct snd_pcm_runtime *runtime) { int tdm_frame_size; /* unip tdm frame size in bytes */ int user_frame_size; /* user tdm frame size in bytes */ /* default unip TDM_WORD_POS_X_Y */ unsigned int word_pos[4] = { 0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A}; int freq, ret; tdm_frame_size = sti_uniperiph_get_unip_tdm_frame_size(player); user_frame_size = sti_uniperiph_get_user_frame_size(runtime); /* fix 16/0 format */ SET_UNIPERIF_CONFIG_MEM_FMT_16_0(player); SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(player); /* number of words inserted on the TDM line */ SET_UNIPERIF_I2S_FMT_NUM_CH(player, user_frame_size / 4 / 2); SET_UNIPERIF_I2S_FMT_ORDER_MSB(player); SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(player); /* Enable the tdm functionality */ SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(player); /* number of 8 bits timeslots avail in unip tdm frame */ SET_UNIPERIF_TDM_FS_REF_DIV_NUM_TIMESLOT(player, tdm_frame_size); /* set the timeslot allocation for words in FIFO */ sti_uniperiph_get_tdm_word_pos(player, word_pos); SET_UNIPERIF_TDM_WORD_POS(player, 1_2, word_pos[WORD_1_2]); SET_UNIPERIF_TDM_WORD_POS(player, 3_4, word_pos[WORD_3_4]); SET_UNIPERIF_TDM_WORD_POS(player, 5_6, word_pos[WORD_5_6]); SET_UNIPERIF_TDM_WORD_POS(player, 7_8, word_pos[WORD_7_8]); /* set unip clk rate (not done vai set_sysclk ops) */ freq = runtime->rate * tdm_frame_size * 8; mutex_lock(&player->ctrl_lock); ret = uni_player_clk_set_rate(player, freq); if (!ret) player->mclk = freq; mutex_unlock(&player->ctrl_lock); return 0; }

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/* * ALSA uniperipheral iec958 controls */
static int uni_player_ctl_iec958_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; uinfo->count = 1; return 0; }

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static int uni_player_ctl_iec958_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; struct snd_aes_iec958 *iec958 = &player->stream_settings.iec958; mutex_lock(&player->ctrl_lock); ucontrol->value.iec958.status[0] = iec958->status[0]; ucontrol->value.iec958.status[1] = iec958->status[1]; ucontrol->value.iec958.status[2] = iec958->status[2]; ucontrol->value.iec958.status[3] = iec958->status[3]; mutex_unlock(&player->ctrl_lock); return 0; }

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static int uni_player_ctl_iec958_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; struct snd_aes_iec958 *iec958 = &player->stream_settings.iec958; mutex_lock(&player->ctrl_lock); iec958->status[0] = ucontrol->value.iec958.status[0]; iec958->status[1] = ucontrol->value.iec958.status[1]; iec958->status[2] = ucontrol->value.iec958.status[2]; iec958->status[3] = ucontrol->value.iec958.status[3]; mutex_unlock(&player->ctrl_lock); uni_player_set_channel_status(player, NULL); return 0; }

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static struct snd_kcontrol_new uni_player_iec958_ctl = { .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT), .info = uni_player_ctl_iec958_info, .get = uni_player_ctl_iec958_get, .put = uni_player_ctl_iec958_put, }; /* * uniperif rate adjustement control */
static int snd_sti_clk_adjustment_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = UNIPERIF_PLAYER_CLK_ADJ_MIN; uinfo->value.integer.max = UNIPERIF_PLAYER_CLK_ADJ_MAX; uinfo->value.integer.step = 1; return 0; }

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static int snd_sti_clk_adjustment_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; mutex_lock(&player->ctrl_lock); ucontrol->value.integer.value[0] = player->clk_adj; mutex_unlock(&player->ctrl_lock); return 0; }

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static int snd_sti_clk_adjustment_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; int ret = 0; if ((ucontrol->value.integer.value[0] < UNIPERIF_PLAYER_CLK_ADJ_MIN) || (ucontrol->value.integer.value[0] > UNIPERIF_PLAYER_CLK_ADJ_MAX)) return -EINVAL; mutex_lock(&player->ctrl_lock); player->clk_adj = ucontrol->value.integer.value[0]; if (player->mclk) ret = uni_player_clk_set_rate(player, player->mclk); mutex_unlock(&player->ctrl_lock); return ret; }

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static struct snd_kcontrol_new uni_player_clk_adj_ctl = { .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Playback Oversampling Freq. Adjustment", .info = snd_sti_clk_adjustment_info, .get = snd_sti_clk_adjustment_get, .put = snd_sti_clk_adjustment_put, }; static struct snd_kcontrol_new *snd_sti_pcm_ctl[] = { &uni_player_clk_adj_ctl, }; static struct snd_kcontrol_new *snd_sti_iec_ctl[] = { &uni_player_iec958_ctl, &uni_player_clk_adj_ctl, };
static int uni_player_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; int ret; player->substream = substream; player->clk_adj = 0; if (!UNIPERIF_TYPE_IS_TDM(player)) return 0; /* refine hw constraint in tdm mode */ ret = snd_pcm_hw_rule_add(substream->runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, sti_uniperiph_fix_tdm_chan, player, SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (ret < 0) return ret; return snd_pcm_hw_rule_add(substream->runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, sti_uniperiph_fix_tdm_format, player, SNDRV_PCM_HW_PARAM_FORMAT, -1); }

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static int uni_player_set_sysclk(struct snd_soc_dai *dai, int clk_id, unsigned int freq, int dir) { struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; int ret; if (UNIPERIF_TYPE_IS_TDM(player) || (dir == SND_SOC_CLOCK_IN)) return 0; if (clk_id != 0) return -EINVAL; mutex_lock(&player->ctrl_lock); ret = uni_player_clk_set_rate(player, freq); if (!ret) player->mclk = freq; mutex_unlock(&player->ctrl_lock); return ret; }

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static int uni_player_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); struct uniperif *player = priv->dai_data.uni; struct snd_pcm_runtime *runtime = substream->runtime; int transfer_size, trigger_limit; int ret; /* The player should be stopped */ if (player->state != UNIPERIF_STATE_STOPPED) { dev_err(player->dev, "%s: invalid player state %d", __func__, player->state); return -EINVAL; } /* Calculate transfer size (in fifo cells and bytes) for frame count */ if (player->info->type == SND_ST_UNIPERIF_TYPE_TDM) { /* transfer size = user frame size (in 32 bits FIFO cell) */ transf