[alsa-devel] SoC on PXA27x with two codecs

[Liam Girdwood]

On Tue, 2010-02-02 at 10:58 +0100, Rodolfo Giometti wrote:
> Hello,
> 
> on my custom board I have a PXA27x CPU and 2 codecs: one connected as
> primary codec and one connected as secondary codec.
> 
> I modify the SoC support in order to allow defining two audio cards,
> one to manage the first codec and one to manage the second one.
> 
> Here the SoC schema:
> 
>    static struct snd_soc_dai_link bt270p_dai[] = {
>            {
>                    .name = "AC97 HiFi",
>                    .stream_name = "audio out",
>                    .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_HIFI],
>                    .codec_dai = &cs4299_dai[CS4299_DAI_AC97_HIFI],
>                    .init = bt270_ac97_init,
>                    .ops = &bt270_ops,
>            },
>            {
>                    .name = "AC97 Aux",
>                    .stream_name = "AC97 Aux",
>                    .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_AUX],
>                    .codec_dai = &cs4299_dai[CS4299_DAI_AC97_AUX],
>                    .init = bt270_ac97_init,
>                    .ops = &bt270_ops,
>            },
>    };
> 
>    static struct snd_soc_dai_link bt270s_dai[] = {
>            {
>                    .name = "AC97 HiFi",
>                    .stream_name = "speakers",
>                    .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_HIFI],
>                    .codec_dai = &cs4299_dai[CS4299_DAI_AC97_HIFI],
>                    .init = bt270_ac97_init,
>                    .ops = &bt270_ops,
>            },
>    };
> 
>    static struct snd_soc_card bt270_asoc[] = {
>            {
>                    .name = "BT270 primary",
>                    .platform = &pxa2xx_soc_platform,
>                    .dai_link = bt270p_dai,
>                    .num_links = ARRAY_SIZE(bt270p_dai),
>            },
>            {
>                    .name = "BT270 secondary",
>                    .platform = &pxa2xx_soc_platform,
>                    .dai_link = bt270s_dai,
>                    .num_links = ARRAY_SIZE(bt270s_dai),
>            },
>    };
> 
>    static struct cs4299_data cs4299_data[] = {
>            {
>                    .ac97_line = 0,
>            },
>            {
>                    .ac97_line = 1,
>            },
>    };
> 
>    static struct snd_soc_device bt270_snd_devdata[2] = {
>            {
>                    .card = &bt270_asoc[0],
>                    .codec_dev = &soc_codec_dev_cs4299,
>                    .codec_data = &cs4299_data[0],
>            },
>            {
>                    .card = &bt270_asoc[1],
>                    .codec_dev = &soc_codec_dev_cs4299,
>                    .codec_data = &cs4299_data[1],
>            },
>    };
> 
>    static struct platform_device *bt270_snd_device[2];
> 
> I'm using the ac97_line parameters into codec's code in order to
> select the primary and the second codecs as follow:
> 
>    static int cs4299_soc_probe(struct platform_device *pdev)
>    {
>            struct snd_soc_device *socdev = platform_get_drvdata(pdev);
>            struct cs4299_data *data = (struct cs4299_data *) socdev->codec_data;
>            struct snd_soc_codec *codec;
>            int ac97_line;
>            int ret = 0;
> 
>            printk(KERN_INFO "CS4299 SoC Audio Codec %s\n", CS4299_VERSION);
> 
>            /* Check specific codec data or set default if not defined */
>            ac97_line = 0;
>            if (data)
>                    ac97_line = data->ac97_line;
> 
>            socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec),
>                                          GFP_KERNEL);
>            if (socdev->card->codec == NULL)
>                    return -ENOMEM;
>            codec = socdev->card->codec;
>            mutex_init(&codec->mutex);
> 
>            codec->reg_cache = kmemdup(cs4299_reg, sizeof(cs4299_reg), GFP_KERNEL);
> 
>            if (codec->reg_cache == NULL) {
>                    ret = -ENOMEM;
>                    goto cache_err;
>            }
>            codec->reg_cache_size = sizeof(cs4299_reg);
>            codec->reg_cache_step = 2;
> 
>            codec->name = "CS4299";
>            codec->id = ac97_line;
>            codec->owner = THIS_MODULE;
>            codec->dai = cs4299_dai;
>            codec->num_dai = ARRAY_SIZE(cs4299_dai);
>            codec->write = ac97_write;
>            codec->read = ac97_read;
>            INIT_LIST_HEAD(&codec->dapm_widgets);
>            INIT_LIST_HEAD(&codec->dapm_paths);
> 
>            ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, ac97_line);
>            if (ret < 0) {
>                    printk(KERN_ERR "cs4299: failed to register AC97
>    		codec\n");
>                    goto codec_err;
>            }
> 
>            /* register pcms */
>            ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
>            if (ret < 0)
>                    goto pcm_err;
> 
>            ret = cs4299_reset(codec, 0);
>            if (ret < 0) {
>                    printk(KERN_ERR "Failed to reset CS4299: AC97 link
>    		error\n");
>                    goto reset_err;
>            }
> 
>            snd_soc_add_controls(codec, cs4299_snd_ac97_controls,
>                                    ARRAY_SIZE(cs4299_snd_ac97_controls));
>            cs4299_add_widgets(codec);
>            ret = snd_soc_init_card(socdev);
>            if (ret < 0) {
>                    printk(KERN_ERR "cs4299: failed to register card\n");
>                    goto reset_err;
>            }
> 
>            return 0;
> 
> Everything is working ok but the PCM play/record. In fact I can manage
> both codecs' registers by using:
> 
>    alsamixer -c 0   and
>    alsamixer -c 1
> 
> but when I try to play an MP3 file I can hear the music only on the
> second codec no matter which audio card I select for playing.
> 
> I tested the hardware by defining just one codec at time, and doing in
> this manner the music goes to the right codec.
> 
> Any suggeston? :)

What about the debug output from the DMA configuration (wrt AC97 slot
FIFOs) I suggested yesterday ? 

We really need to confirm the AC97 slots being used and whether each
codec is listening on these slots.

Liam


-- 
Freelance Developer, SlimLogic Ltd
ASoC and Voltage Regulator Maintainer.
http://www.slimlogic.co.uk