linux-kernel - Re: [PATCH 4/7] ASoC: codecs: lpass-va-macro: Change bulk voting to individual clock voting

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Date:   Tue, 21 Sep 2021 13:44:19 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        rohitkr@...eaurora.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, swboyd@...omium.org,
        judyhsiao@...omium.org
Cc:     Venkata Prasad Potturu <potturu@...eaurora.org>
Subject: Re: [PATCH 4/7] ASoC: codecs: lpass-va-macro: Change bulk voting to
 individual clock voting


On 9/20/2021 6:55 PM, Srinivas Kandagatla wrote:
>
>
Thanks for Your time Srini!!!
> On 20/09/2021 08:35, Srinivasa Rao Mandadapu wrote:
>> Change bulk clock frequency voting to individual voting.
>>
> Can you please explain why do we need to move out using clk bulk apis?
>
> Am not seeing any thing obvious behavior changing as part of this 
> patch, more details please..

In ADSP bypass use case, few clocks like macro and decode, are optional. 
So is the main reason for move out.

And sometimes we are seeing bulk voting failed in Kodiak setup.

>> Fixes: 908e6b1df26e (ASoC: codecs: lpass-va-macro: Add support to VA 
>> Macro)
>
> Why this has Fixes tag? Are we fixing any bug with this patch?
Okay. As such we are not fixing any bug. Will remove this fixes tag on 
your suggestion.
>
>>
>> Signed-off-by: Venkata Prasad Potturu <potturu@...eaurora.org>
>> Signed-off-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
>> ---
>>   sound/soc/codecs/lpass-va-macro.c | 46 
>> ++++++++++++++++++++++++---------------
>>   1 file changed, 28 insertions(+), 18 deletions(-)
>>
>> diff --git a/sound/soc/codecs/lpass-va-macro.c 
>> b/sound/soc/codecs/lpass-va-macro.c
>> index d312a14..0ea39ae 100644
>> --- a/sound/soc/codecs/lpass-va-macro.c
>> +++ b/sound/soc/codecs/lpass-va-macro.c
>> @@ -193,7 +193,10 @@ struct va_macro {
>>         int dec_mode[VA_MACRO_NUM_DECIMATORS];
>>       struct regmap *regmap;
>> -    struct clk_bulk_data clks[VA_NUM_CLKS_MAX];
>> +    struct clk *mclk;
>> +    struct clk *macro;
>> +    struct clk *dcodec;
>> +
>>       struct clk_hw hw;
>>         s32 dmic_0_1_clk_cnt;
>> @@ -1321,7 +1324,7 @@ static const struct clk_ops fsgen_gate_ops = {
>>     static int va_macro_register_fsgen_output(struct va_macro *va)
>>   {
>> -    struct clk *parent = va->clks[2].clk;
>> +    struct clk *parent = va->mclk;
>>       struct device *dev = va->dev;
>>       struct device_node *np = dev->of_node;
>>       const char *parent_clk_name;
>> @@ -1404,15 +1407,18 @@ static int va_macro_probe(struct 
>> platform_device *pdev)
>>           return -ENOMEM;
>>         va->dev = dev;
>> -    va->clks[0].id = "macro";
>> -    va->clks[1].id = "dcodec";
>> -    va->clks[2].id = "mclk";
>>   -    ret = devm_clk_bulk_get(dev, VA_NUM_CLKS_MAX, va->clks);
>> -    if (ret) {
>> -        dev_err(dev, "Error getting VA Clocks (%d)\n", ret);
>> -        return ret;
>> -    }
>> +    va->macro = devm_clk_get_optional(dev, "macro");
>> +    if (IS_ERR(va->macro))
>> +        return PTR_ERR(va->macro);
>> +
>> +    va->dcodec = devm_clk_get_optional(dev, "dcodec");
>> +    if (IS_ERR(va->dcodec))
>> +        return PTR_ERR(va->dcodec);
>> +
>> +    va->mclk = devm_clk_get(dev, "mclk");
>> +    if (IS_ERR(va->mclk))
>> +        return PTR_ERR(va->mclk);
>>         ret = of_property_read_u32(dev->of_node, 
>> "qcom,dmic-sample-rate",
>>                      &sample_rate);
>> @@ -1426,10 +1432,11 @@ static int va_macro_probe(struct 
>> platform_device *pdev)
>>       }
>>         /* mclk rate */
>> -    clk_set_rate(va->clks[1].clk, VA_MACRO_MCLK_FREQ);
>> -    ret = clk_bulk_prepare_enable(VA_NUM_CLKS_MAX, va->clks);
>> -    if (ret)
>> -        return ret;
>> +    clk_set_rate(va->mclk, VA_MACRO_MCLK_FREQ);
>> +
>> +    clk_prepare_enable(va->mclk);
>> +    clk_prepare_enable(va->macro);
>> +    clk_prepare_enable(va->dcodec);
>>         base = devm_platform_ioremap_resource(pdev, 0);
>>       if (IS_ERR(base)) {
>> @@ -1457,8 +1464,9 @@ static int va_macro_probe(struct 
>> platform_device *pdev)
>>       return ret;
>>     err:
>> -    clk_bulk_disable_unprepare(VA_NUM_CLKS_MAX, va->clks);
>> -
>> +    clk_disable_unprepare(va->mclk);
>> +    clk_disable_unprepare(va->macro);
>> +    clk_disable_unprepare(va->dcodec);
>>       return ret;
>>   }
>>   @@ -1466,8 +1474,10 @@ static int va_macro_remove(struct 
>> platform_device *pdev)
>>   {
>>       struct va_macro *va = dev_get_drvdata(&pdev->dev);
>>   -    clk_bulk_disable_unprepare(VA_NUM_CLKS_MAX, va->clks);
>> -
>> +    of_clk_del_provider(pdev->dev.of_node);
>
> fsgen clk is registered using devm_* variant of clk apis, so why do we 
> need this here?
>
Okay. Will remove it and post new patch.
>
> --srini
>> +    clk_disable_unprepare(va->mclk);
>> +    clk_disable_unprepare(va->macro);
>> +    clk_disable_unprepare(va->dcodec);
>>       return 0;
>>   }
>>
-- 
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