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Subject: Re: [PATCH] Asoc: qcom: Add four speaker support on MI2S secondary
To:     Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
        agross@kernel.org, bjorn.andersson@linaro.org, lgirdwood@gmail.com,
        broonie@kernel.org, robh+dt@kernel.org, plai@codeaurora.org,
        bgoswami@codeaurora.org, perex@perex.cz, tiwai@suse.com,
        rohitkr@codeaurora.org, linux-arm-msm@vger.kernel.org,
        alsa-devel@alsa-project.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, swboyd@chromium.org,
        judyhsiao@chromium.org
References: <20210527073309.28661-1-srivasam@codeaurora.org>
 <213e1133-0164-03da-1740-c7ca39f3fd8c@linaro.org>
From:   Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
Organization: Qualcomm India Private Limited.
Message-ID: <8483cafd-8dbd-c603-7290-de666376649d@codeaurora.org>
Date:   Wed, 9 Jun 2021 12:42:17 +0530
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Hi Srini,

Thanks for your review comments!!!.

On 5/28/2021 2:06 PM, Srinivas Kandagatla wrote:
> Hi Srinivasa,
>
> On 27/05/2021 08:33, Srinivasa Rao Mandadapu wrote:
>> Add four speaker support on MI2S secondary block
>> by using I2S SD1 line on gpio52 pin, and add channel map
>> control support in the lpass-cpu audio driver.
>>
>> Signed-off-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
>> ---
>>   sound/soc/qcom/lpass-cpu.c    | 106 +++++++++++++++++++++++++++++++++-
>>   sound/soc/qcom/lpass-sc7180.c |   1 +
>>   sound/soc/qcom/lpass.h        |   5 ++
>>   3 files changed, 111 insertions(+), 1 deletion(-)
>>
>
> This patch looks totally redundant to set_channel_map/get_channel_map 
> implementation. You should probably consider adding that support to 
> the qcom_lpass_cpu_dai_ops. And let the machine driver set the channel 
> map.
>
> --srini
Yes we will do changes accordingly and Post next patch.
>
>> diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
>> index c62d2612e8f5..88a038a107a7 100644
>> --- a/sound/soc/qcom/lpass-cpu.c
>> +++ b/sound/soc/qcom/lpass-cpu.c
>> @@ -28,6 +28,19 @@
>>   #define LPASS_CPU_I2S_SD2_3_MASK    GENMASK(3, 2)
>>   #define LPASS_CPU_I2S_SD0_1_2_MASK    GENMASK(2, 0)
>>   #define LPASS_CPU_I2S_SD0_1_2_3_MASK    GENMASK(3, 0)
>> +#define LPASS_CHMAP_IDX_UNKNOWN        -1
>> +
>> +/*
>> + * Channel maps for multi-channel playbacks on MI2S Secondary, up to 
>> 4 n_ch
>> + */
>> +static struct snd_pcm_chmap_elem lpass_chmaps[] = {
>> +    { .channels = 2,
>> +      .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
>> +    { .channels = 4,
>> +      .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
>> +                SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
>> +    { }
>> +};
>>     static int lpass_cpu_init_i2sctl_bitfields(struct device *dev,
>>               struct lpaif_i2sctl *i2sctl, struct regmap *map)
>> @@ -86,6 +99,9 @@ static int lpass_cpu_daiops_startup(struct 
>> snd_pcm_substream *substream,
>> clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
>>           return ret;
>>       }
>> +    if (drvdata->chmap_info && drvdata->chmap_info->max_channels == 4)
>> +        drvdata->chmap_info->chmap = lpass_chmaps;
>> +
>>       return 0;
>>   }
>>   @@ -96,6 +112,7 @@ static void lpass_cpu_daiops_shutdown(struct 
>> snd_pcm_substream *substream,
>> clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
>> clk_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]);
>> +    drvdata->chmap_idx = LPASS_CHMAP_IDX_UNKNOWN;
>>   }
>>     static int lpass_cpu_daiops_hw_params(struct snd_pcm_substream 
>> *substream,
>> @@ -224,9 +241,14 @@ static int lpass_cpu_daiops_hw_params(struct 
>> snd_pcm_substream *substream,
>>                   ret);
>>               return ret;
>>           }
>> -        if (channels >= 2)
>> +        if (channels >= 2) {
>>               ret = regmap_fields_write(i2sctl->spkmono, id,
>>                            LPAIF_I2SCTL_SPKMONO_STEREO);
>> +            if (channels == 4)
>> +                drvdata->chmap_idx = 1;
>> +            else
>> +                drvdata->chmap_idx = 0;
>> +        }
>>           else
>>               ret = regmap_fields_write(i2sctl->spkmono, id,
>>                            LPAIF_I2SCTL_SPKMONO_MONO);
>> @@ -324,6 +346,84 @@ const struct snd_soc_dai_ops 
>> asoc_qcom_lpass_cpu_dai_ops = {
>>   };
>>   EXPORT_SYMBOL_GPL(asoc_qcom_lpass_cpu_dai_ops);
>>   +static int lpass_cpu_chmap_ctl_get(struct snd_kcontrol *kcontrol,
>> +                struct snd_ctl_elem_value *ucontrol)
>> +{
>> +    unsigned const char *map;
>> +    unsigned int i;
>> +    struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
>> +    struct lpass_data *drvdata = info->private_data;
>> +
>> +    if (info->max_channels == 2)
>> +        map = &lpass_chmaps[0].map[0];
>> +    else if (info->max_channels == 4)
>> +        map = &lpass_chmaps[1].map[0];
>> +
>> +    for (i = 0; i < info->max_channels; i++) {
>> +        if (drvdata->chmap_idx == LPASS_CHMAP_IDX_UNKNOWN)
>> +            ucontrol->value.integer.value[i] = 0;
>> +        else
>> +            ucontrol->value.integer.value[i] = map[i];
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int lpass_cpu_chmap_ctl_set(struct snd_kcontrol *kcontrol,
>> +                struct snd_ctl_elem_value *ucontrol)
>> +{
>> +    unsigned int i;
>> +    struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
>> +    struct lpass_data *drvdata = info->private_data;
>> +    unsigned char *map;
>> +
>> +    if (info->max_channels == 2)
>> +        map = &lpass_chmaps[0].map[0];
>> +    else if (info->max_channels == 4)
>> +        map = &lpass_chmaps[1].map[0];
>> +
>> +    for (i = 0; i < info->max_channels; i++) {
>> +        if (drvdata->chmap_idx == LPASS_CHMAP_IDX_UNKNOWN)
>> +            map[i] = 0;
>> +        else
>> +            map[i] = ucontrol->value.integer.value[i];
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
>> +                  struct snd_soc_dai *dai)
>> +{
>> +    int ret;
>> +
>> +    struct snd_soc_dai_driver *drv = dai->driver;
>> +    struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
>> +
>> +    ret =  snd_pcm_add_chmap_ctls(rtd->pcm, SNDRV_PCM_STREAM_PLAYBACK,
>> +            snd_pcm_alt_chmaps, drv->playback.channels_max, 0,
>> +            &drvdata->chmap_info);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +
>> +    /*
>> +     * override handlers
>> +     */
>> +    drvdata->chmap_info->private_data = drvdata;
>> +    drvdata->chmap_info->kctl->get = lpass_cpu_chmap_ctl_get;
>> +    drvdata->chmap_info->kctl->put = lpass_cpu_chmap_ctl_set;
>> +
>> +    /*
>> +     * default chmap supported is stereo
>> +     */
>> +    drvdata->chmap_info->chmap = lpass_chmaps;
>> +    drvdata->chmap_idx = LPASS_CHMAP_IDX_UNKNOWN;
>> +
>> +    return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(lpass_cpu_pcm_new);
>> +
>>   int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai)
>>   {
>>       struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
>> @@ -856,6 +956,10 @@ int asoc_qcom_lpass_cpu_platform_probe(struct 
>> platform_device *pdev)
>>                   PTR_ERR(drvdata->mi2s_bit_clk[dai_id]));
>>               return PTR_ERR(drvdata->mi2s_bit_clk[dai_id]);
>>           }
>> +        if (drvdata->mi2s_playback_sd_mode[dai_id] == 
>> LPAIF_I2SCTL_MODE_QUAD01) {
>> + variant->dai_driver[dai_id].playback.channels_min = 4;
>> + variant->dai_driver[dai_id].playback.channels_max = 4;
>> +        }
>>       }
>>         /* Allocation for i2sctl regmap fields */
>> diff --git a/sound/soc/qcom/lpass-sc7180.c 
>> b/sound/soc/qcom/lpass-sc7180.c
>> index 8c168d3c589e..77a556b27cf0 100644
>> --- a/sound/soc/qcom/lpass-sc7180.c
>> +++ b/sound/soc/qcom/lpass-sc7180.c
>> @@ -58,6 +58,7 @@ static struct snd_soc_dai_driver 
>> sc7180_lpass_cpu_dai_driver[] = {
>>           },
>>           .probe    = &asoc_qcom_lpass_cpu_dai_probe,
>>           .ops    = &asoc_qcom_lpass_cpu_dai_ops,
>> +        .pcm_new = lpass_cpu_pcm_new,
>>       }, {
>>           .id = LPASS_DP_RX,
>>           .name = "Hdmi",
>> diff --git a/sound/soc/qcom/lpass.h b/sound/soc/qcom/lpass.h
>> index 83b2e08ade06..fb82591d550c 100644
>> --- a/sound/soc/qcom/lpass.h
>> +++ b/sound/soc/qcom/lpass.h
>> @@ -76,6 +76,9 @@ struct lpass_data {
>>       /* regmap backed by the low-power audio interface (LPAIF) 
>> registers */
>>       struct regmap *lpaif_map;
>>       struct regmap *hdmiif_map;
>> +    struct snd_pcm_chmap *chmap_info;
>> +
>> +    int chmap_idx;
>>         /* interrupts from the low-power audio interface (LPAIF) */
>>       int lpaif_irq;
>> @@ -259,5 +262,7 @@ void asoc_qcom_lpass_cpu_platform_shutdown(struct 
>> platform_device *pdev);
>>   int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev);
>>   int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai);
>>   extern const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops;
>> +int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
>> +                struct snd_soc_dai *dai);
>>     #endif /* __LPASS_H__ */
>>
-- 
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