uda1341播放声音断断续续

请问版主，我移植的内核是linux-3.0,移植完uda1341驱动后播放声音断断续续，而且时间走得很慢，不知道是啥原因？

频率设置错了

请问可以讲得具体一些吗？

下面我把编解码器的代码贴出来：
/*
* uda134x.c  --  UDA134X ALSA SoC Codec driver
*
* Modifications by Christian Pellegrin <chripell@evolware.org>
*
* Copyright 2007 Dension Audio Systems Ltd.
* Author: Zoltan Devai
*
* Based on the WM87xx drivers by Liam Girdwood and Richard Purdie
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

#include <sound/uda134x.h>
#include <sound/l3.h>

#include "uda134x.h"


#define UDA134X_RATES SNDRV_PCM_RATE_8000_48000
#define UDA134X_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \
        SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE)

struct uda134x_priv {
    int sysclk;
    int dai_fmt;

    struct snd_pcm_substream *master_substream;
    struct snd_pcm_substream *slave_substream;
};

/* In-data addresses are hard-coded into the reg-cache values */
static const char uda134x_reg[UDA134X_REGS_NUM] = {
    /* Extended address registers */
    0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00,
    /* Status, data regs */
    0x00, 0x83, 0x00, 0x40, 0x80, 0xC0, 0x00,
};

/*
* The codec has no support for reading its registers except for peak level...
*/
static inline unsigned int uda134x_read_reg_cache(struct snd_soc_codec *codec,
    unsigned int reg)
{
    u8 *cache = codec->reg_cache;

    if (reg >= UDA134X_REGS_NUM)
        return -1;
    return cache[reg];
}

/*
* Write the register cache
*/
static inline void uda134x_write_reg_cache(struct snd_soc_codec *codec,
    u8 reg, unsigned int value)
{
    u8 *cache = codec->reg_cache;

    if (reg >= UDA134X_REGS_NUM)
        return;
    cache[reg] = value;
}

/*
* Write to the uda134x registers
*
*/
static int uda134x_write(struct snd_soc_codec *codec, unsigned int reg,
    unsigned int value)
{
    int ret;
    u8 addr;
    u8 data = value;
    struct uda134x_platform_data *pd = codec->control_data;

    pr_debug("%s reg: %02X, value:%02X\n", __func__, reg, value);

    if (reg >= UDA134X_REGS_NUM) {
        printk(KERN_ERR "%s unknown register: reg: %u",
               __func__, reg);
        return -EINVAL;
    }

    uda134x_write_reg_cache(codec, reg, value);

    switch (reg) {
    case UDA134X_STATUS0:
    case UDA134X_STATUS1:
        addr = UDA134X_STATUS_ADDR;
        break;
    case UDA134X_DATA000:
    case UDA134X_DATA001:
    case UDA134X_DATA010:
    case UDA134X_DATA011:
        addr = UDA134X_DATA0_ADDR;
        break;
    case UDA134X_DATA1:
        addr = UDA134X_DATA1_ADDR;
        break;
    default:
        /* It's an extended address register */
        addr =  (reg | UDA134X_EXTADDR_PREFIX);

        ret = l3_write(&pd->l3,
                   UDA134X_DATA0_ADDR, &addr, 1);
        if (ret != 1)
            return -EIO;

        addr = UDA134X_DATA0_ADDR;
        data = (value | UDA134X_EXTDATA_PREFIX);
        break;
    }

    ret = l3_write(&pd->l3,
               addr, &data, 1);
    if (ret != 1)
        return -EIO;

    return 0;
}

static inline void uda134x_reset(struct snd_soc_codec *codec)
{
    u8 reset_reg = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
    uda134x_write(codec, UDA134X_STATUS0, reset_reg | (1<<6));
    msleep(1);
    uda134x_write(codec, UDA134X_STATUS0, reset_reg & ~(1<<6));
}

static int uda134x_mute(struct snd_soc_dai *dai, int mute)
{
    struct snd_soc_codec *codec = dai->codec;
    u8 mute_reg = uda134x_read_reg_cache(codec, UDA134X_DATA010);

    pr_debug("%s mute: %d\n", __func__, mute);

    if (mute)
        mute_reg |= (1<<2);
    else
        mute_reg &= ~(1<<2);

    uda134x_write(codec, UDA134X_DATA010, mute_reg);

    return 0;
}

static int uda134x_startup(struct snd_pcm_substream *substream,
    struct snd_soc_dai *dai)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_codec *codec =rtd->codec;
    struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);
    struct snd_pcm_runtime *master_runtime;

    if (uda134x->master_substream) {
        master_runtime = uda134x->master_substream->runtime;

        pr_debug("%s constraining to %d bits at %d\n", __func__,
             master_runtime->sample_bits,
             master_runtime->rate);

        snd_pcm_hw_constraint_minmax(substream->runtime,
                         SNDRV_PCM_HW_PARAM_RATE,
                         master_runtime->rate,
                         master_runtime->rate);

        snd_pcm_hw_constraint_minmax(substream->runtime,
                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
                         master_runtime->sample_bits,
                         master_runtime->sample_bits);

        uda134x->slave_substream = substream;
    } else
        uda134x->master_substream = substream;

    return 0;
}

static void uda134x_shutdown(struct snd_pcm_substream *substream,
    struct snd_soc_dai *dai)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_codec *codec = rtd->codec;
    struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);

    if (uda134x->master_substream == substream)
        uda134x->master_substream = uda134x->slave_substream;

    uda134x->slave_substream = NULL;
}

static int uda134x_hw_params(struct snd_pcm_substream *substream,
    struct snd_pcm_hw_params *params,
    struct snd_soc_dai *dai)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_codec *codec = rtd->codec;
    struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);
    u8 hw_params;

    if (substream == uda134x->slave_substream) {
        pr_debug("%s ignoring hw_params for slave substream\n",
             __func__);
        return 0;
    }

    hw_params = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
    hw_params &= STATUS0_SYSCLK_MASK;
    hw_params &= STATUS0_DAIFMT_MASK;

    pr_debug("%s sysclk: %d, rate:%d\n", __func__,
                         uda134x->sysclk, params_rate(params));

    /* set SYSCLK / fs ratio */
    switch (uda134x->sysclk / params_rate(params)) {
    case 512:
                hw_params &= ~(0x3<<4); // 0 0
                printk("512 512 512 512 512\n");
        break;
    case 384:
        hw_params |= (1<<4);
                printk("384 384 384 384 384\n");
        break;
    case 256:
        hw_params |= (1<<5);
                printk("256 256 256 256 256\n");
        break;
    default:
        printk(KERN_ERR "%s unsupported fs\n", __func__);
        return -EINVAL;
    }

    pr_debug("%s dai_fmt: %d, params_format:%d\n", __func__,
         uda134x->dai_fmt, params_format(params));

    /* set DAI format and word length */
    switch (uda134x->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    case SND_SOC_DAIFMT_I2S:
                printk("SND_SOC_DAIFMT_I2S\n");
        break;
    case SND_SOC_DAIFMT_RIGHT_J:
        switch (params_format(params)) {
        case SNDRV_PCM_FORMAT_S16_LE:
            hw_params |= (1<<1);
            break;
        case SNDRV_PCM_FORMAT_S18_3LE:
            hw_params |= (1<<2);
            break;
        case SNDRV_PCM_FORMAT_S20_3LE:
            hw_params |= ((1<<2) | (1<<1));
            break;
        default:
            printk(KERN_ERR "%s unsupported format (right)\n",
                   __func__);
            return -EINVAL;
            }
        break;
    case SND_SOC_DAIFMT_LEFT_J:
        hw_params |= (1<<3);
        break;
    default:
        printk(KERN_ERR "%s unsupported format\n", __func__);
        return -EINVAL;
    }

    uda134x_write(codec, UDA134X_STATUS0, hw_params);

    return 0;
}

接着上面：
static int uda134x_set_dai_sysclk(struct snd_soc_dai *codec_dai,
                  int clk_id, unsigned int freq, int dir)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);

    //pr_debug("%s clk_id: %d, freq: %u, dir: %d\n", __func__,
         //clk_id, freq, dir);  //clk_id: 0, freq: 11289600, dir: 1
        printk("%s clk_id: %d, freq: %u, dir: %d\n", __func__,
                         clk_id, freq, dir);

    /* Anything between 256fs*8Khz and 512fs*48Khz should be acceptable
       because the codec is slave. Of course limitations of the clock
       master (the IIS controller) apply.
       We'll error out on set_hw_params if it's not OK */
    if ((freq >= (256 * 8000)) && (freq <= (512 * 48000))) {
        uda134x->sysclk = freq;
        return 0;
    }

    printk(KERN_ERR "%s unsupported sysclk\n", __func__);
    return -EINVAL;
}

static int uda134x_set_dai_fmt(struct snd_soc_dai *codec_dai,
                   unsigned int fmt)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);

    //pr_debug("%s fmt: %08X\n", __func__, fmt);
    printk("%s fmt: %08X\n", __func__, fmt);//fmt: 00004101

    /* codec supports only full slave mode */
    if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
        printk(KERN_ERR "%s unsupported slave mode\n", __func__);
        return -EINVAL;
    }

    /* no support for clock inversion */
    if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
        printk(KERN_ERR "%s unsupported clock inversion\n", __func__);
        return -EINVAL;
    }

    /* We can't setup DAI format here as it depends on the word bit num */
    /* so let's just store the value for later */
    uda134x->dai_fmt = fmt;

    return 0;
}

static int uda134x_set_bias_level(struct snd_soc_codec *codec,
                  enum snd_soc_bias_level level)
{
    u8 reg;
    struct uda134x_platform_data *pd = codec->control_data;
    int i;
    u8 *cache = codec->reg_cache;

    pr_debug("%s bias level %d\n", __func__, level);

    switch (level) {
    case SND_SOC_BIAS_ON:
                printk("SND_SOC_BIAS_ON\n");
        /* ADC, DAC on */
        switch (pd->model) {
        case UDA134X_UDA1340:
        case UDA134X_UDA1344:
        case UDA134X_UDA1345:
            reg = uda134x_read_reg_cache(codec, UDA134X_DATA011);
            uda134x_write(codec, UDA134X_DATA011, reg | 0x03);
                        printk("UDA134X_UDA1345\n");
            break;
        case UDA134X_UDA1341:
            reg = uda134x_read_reg_cache(codec, UDA134X_STATUS1);
            uda134x_write(codec, UDA134X_STATUS1, reg | 0x03);
                        printk("UDA134X_UDA1341\n");
            break;
        default:
            printk(KERN_ERR "UDA134X SoC codec: "
                   "unsupported model %d\n", pd->model);
            return -EINVAL;
            }
        break;
    case SND_SOC_BIAS_PREPARE:
        /* power on */
        if (pd->power) {
            pd->power(1);
            /* Sync reg_cache with the hardware */
            for (i = 0; i < ARRAY_SIZE(uda134x_reg); i++)
                codec->driver->write(codec, i, *cache++);
            printk("SND_SOC_BIAS_PREPARE\n");
            }
        break;
    case SND_SOC_BIAS_STANDBY:
        /* ADC, DAC power off */
        switch (pd->model) {
        case UDA134X_UDA1340:
        case UDA134X_UDA1344:
        case UDA134X_UDA1345:
            reg = uda134x_read_reg_cache(codec, UDA134X_DATA011);
            uda134x_write(codec, UDA134X_DATA011, reg & ~(0x03));
            break;
        case UDA134X_UDA1341:
            reg = uda134x_read_reg_cache(codec, UDA134X_STATUS1);
            uda134x_write(codec, UDA134X_STATUS1, reg & ~(0x03));
            break;
        default:
            printk(KERN_ERR "UDA134X SoC codec: "
                   "unsupported model %d\n", pd->model);
            return -EINVAL;
            }
        break;
    case SND_SOC_BIAS_OFF:
        /* power off */
        if (pd->power)
            pd->power(0);
        break;
    }
    codec->dapm.bias_level = level;
    return 0;
}

static const char *uda134x_dsp_setting[] = {"Flat", "Minimum1",
                        "Minimum2", "Maximum"};
static const char *uda134x_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
static const char *uda134x_mixmode[] = {"Differential", "Analog1",
                    "Analog2", "Both"};

static const struct soc_enum uda134x_mixer_enum[] = {
SOC_ENUM_SINGLE(UDA134X_DATA010, 0, 0x04, uda134x_dsp_setting),
SOC_ENUM_SINGLE(UDA134X_DATA010, 3, 0x04, uda134x_deemph),
SOC_ENUM_SINGLE(UDA134X_EA010, 0, 0x04, uda134x_mixmode),
};

static const struct snd_kcontrol_new uda1341_snd_controls[] = {
SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),
SOC_SINGLE("Capture Volume", UDA134X_EA010, 2, 0x07, 0),
SOC_SINGLE("Analog1 Volume", UDA134X_EA000, 0, 0x1F, 1),
SOC_SINGLE("Analog2 Volume", UDA134X_EA001, 0, 0x1F, 1),

SOC_SINGLE("Mic Sensitivity", UDA134X_EA010, 2, 7, 0),
SOC_SINGLE("Mic Volume", UDA134X_EA101, 0, 0x1F, 0),

SOC_SINGLE("Tone Control - Bass", UDA134X_DATA001, 2, 0xF, 0),
SOC_SINGLE("Tone Control - Treble", UDA134X_DATA001, 0, 3, 0),

SOC_ENUM("Sound Processing Filter", uda134x_mixer_enum[0]),
SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),
SOC_ENUM("Input Mux", uda134x_mixer_enum[2]),

SOC_SINGLE("AGC Switch", UDA134X_EA100, 4, 1, 0),
SOC_SINGLE("AGC Target Volume", UDA134X_EA110, 0, 0x03, 1),
SOC_SINGLE("AGC Timing", UDA134X_EA110, 2, 0x07, 0),

SOC_SINGLE("DAC +6dB Switch", UDA134X_STATUS1, 6, 1, 0),
SOC_SINGLE("ADC +6dB Switch", UDA134X_STATUS1, 5, 1, 0),
SOC_SINGLE("ADC Polarity Switch", UDA134X_STATUS1, 4, 1, 0),
SOC_SINGLE("DAC Polarity Switch", UDA134X_STATUS1, 3, 1, 0),
SOC_SINGLE("Double Speed Playback Switch", UDA134X_STATUS1, 2, 1, 0),
SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
};

static const struct snd_kcontrol_new uda1340_snd_controls[] = {
SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),

SOC_SINGLE("Tone Control - Bass", UDA134X_DATA001, 2, 0xF, 0),
SOC_SINGLE("Tone Control - Treble", UDA134X_DATA001, 0, 3, 0),

SOC_ENUM("Sound Processing Filter", uda134x_mixer_enum[0]),
SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),

SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
};

static const struct snd_kcontrol_new uda1345_snd_controls[] = {
SOC_SINGLE("Master Playback Volume", UDA134X_DATA000, 0, 0x3F, 1),

SOC_ENUM("PCM Playback De-emphasis", uda134x_mixer_enum[1]),

SOC_SINGLE("DC Filter Enable Switch", UDA134X_STATUS0, 0, 1, 0),
};

static const struct snd_soc_dai_ops uda134x_dai_ops = {
    .startup    = uda134x_startup,
    .shutdown   = uda134x_shutdown,
    .hw_params  = uda134x_hw_params,
    .digital_mute   = uda134x_mute,
    .set_sysclk = uda134x_set_dai_sysclk,
    .set_fmt    = uda134x_set_dai_fmt,
};

static struct snd_soc_dai_driver uda134x_dai = {
    .name = "uda134x-hifi",
    /* playback capabilities */
    .playback = {
        .stream_name = "Playback",
        .channels_min = 1,
        .channels_max = 2,
        .rates = UDA134X_RATES,
        .formats = UDA134X_FORMATS,
    },
    /* capture capabilities */
    .capture = {
        .stream_name = "Capture",
        .channels_min = 1,
        .channels_max = 2,
        .rates = UDA134X_RATES,
        .formats = UDA134X_FORMATS,
    },
    /* pcm operations */
    .ops = &uda134x_dai_ops,
};

接着上面：
static int uda134x_soc_probe(struct snd_soc_codec *codec)
{
    struct uda134x_priv *uda134x;
    struct uda134x_platform_data *pd = codec->card->dev->platform_data;

    int ret;
    printk(KERN_INFO "UDA134X SoC Audio Codec\n");

    if (!pd) {
        printk(KERN_ERR "UDA134X SoC codec: "
               "missing L3 bitbang function\n");
        return -ENODEV;
    }

    switch (pd->model) {
    case UDA134X_UDA1340:
    case UDA134X_UDA1341:
    case UDA134X_UDA1344:
    case UDA134X_UDA1345:
        break;
    default:
        printk(KERN_ERR "UDA134X SoC codec: "
               "unsupported model %d\n",
            pd->model);
        return -EINVAL;
    }

    uda134x = kzalloc(sizeof(struct uda134x_priv), GFP_KERNEL);
    if (uda134x == NULL)
        return -ENOMEM;
    snd_soc_codec_set_drvdata(codec, uda134x);

    codec->control_data = pd;

    if (pd->power)
        pd->power(1);

    uda134x_reset(codec);

    if (pd->is_powered_on_standby)
        uda134x_set_bias_level(codec, SND_SOC_BIAS_ON);
    else
        uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    switch (pd->model) {
    case UDA134X_UDA1340:
    case UDA134X_UDA1344:
        ret = snd_soc_add_codec_controls(codec, uda1340_snd_controls,
                    ARRAY_SIZE(uda1340_snd_controls));
    break;
    case UDA134X_UDA1341:
        ret = snd_soc_add_codec_controls(codec, uda1341_snd_controls,
                    ARRAY_SIZE(uda1341_snd_controls));
    break;
    case UDA134X_UDA1345:
        ret = snd_soc_add_codec_controls(codec, uda1345_snd_controls,
                    ARRAY_SIZE(uda1345_snd_controls));
    break;
    default:
        printk(KERN_ERR "%s unknown codec type: %d",
            __func__, pd->model);
        kfree(uda134x);
        return -EINVAL;
    }

    if (ret < 0) {
        printk(KERN_ERR "UDA134X: failed to register controls\n");
        kfree(uda134x);
        return ret;
    }

    return 0;
}

/* power down chip */
static int uda134x_soc_remove(struct snd_soc_codec *codec)
{
    struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);

    uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
    uda134x_set_bias_level(codec, SND_SOC_BIAS_OFF);

    kfree(uda134x);
    return 0;
}

#if defined(CONFIG_PM)
static int uda134x_soc_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
    uda134x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
    uda134x_set_bias_level(codec, SND_SOC_BIAS_OFF);
    return 0;
}

static int uda134x_soc_resume(struct snd_soc_codec *codec)
{
    uda134x_set_bias_level(codec, SND_SOC_BIAS_PREPARE);
    uda134x_set_bias_level(codec, SND_SOC_BIAS_ON);
    return 0;
}
#else
#define uda134x_soc_suspend NULL
#define uda134x_soc_resume NULL
#endif /* CONFIG_PM */

static struct snd_soc_codec_driver soc_codec_dev_uda134x = {
    .probe =        uda134x_soc_probe,
    .remove =       uda134x_soc_remove,
    .suspend =      uda134x_soc_suspend,
    .resume =       uda134x_soc_resume,
    .reg_cache_size = sizeof(uda134x_reg),
    .reg_word_size = sizeof(u8),
    .reg_cache_default = uda134x_reg,
    .reg_cache_step = 1,
    .read = uda134x_read_reg_cache,
    .write = uda134x_write,
    .set_bias_level = uda134x_set_bias_level,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_uda134x);

static int __devinit uda134x_codec_probe(struct platform_device *pdev)
{
        return snd_soc_register_codec(&pdev->dev,
            &soc_codec_dev_uda134x, &uda134x_dai, 1);
}

static int __devexit uda134x_codec_remove(struct platform_device *pdev)
{
    snd_soc_unregister_codec(&pdev->dev);
    return 0;
}

static struct platform_driver uda134x_codec_driver = {
    .driver = {
        .name = "uda134x-codec",
        .owner = THIS_MODULE,
    },
    .probe = uda134x_codec_probe,
    .remove = __devexit_p(uda134x_codec_remove),
};


static int __init uda134x_codec_init(void)
{
        return platform_driver_register(&uda134x_codec_driver);
}
static void __exit uda134x_codec_exit(void)
{
        platform_driver_unregister(&uda134x_codec_driver);       
}
module_init(uda134x_codec_init);
module_exit(uda134x_codec_exit);
//module_platform_driver(uda134x_codec_driver);

MODULE_DESCRIPTION("UDA134X ALSA soc codec driver");
MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
MODULE_LICENSE("GPL");

Hens007 发表于 2013-1-7 09:08
请问可以讲得具体一些吗？

试一下修改sound/soc/samsung/s3c24xx_uda134x.c中的采样率之类的，详情请自行查看代码。

奇怪了，我参考了TQ2416的内核源码来修改，现在除了管脚不同外其它代码跟TQ2416内核中关于uda1341驱动程序完全一样（s3c24xx_uda134x.c和uda134x.c完全一样），可还是没解决声音断断续续的问题，版主可能还有哪些原因？

而且播放时时间走得很慢

请求万能的版主或者各位大神指导，折腾几天时间了，头大……

同问，但我用的是linux 3.2.35