linux-kernel - Re: [PATCH 2/3] ASoC: AMD: Move clk enable from hw

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Message-ID: <4c8cfac4-e67a-4457-0e27-2beb34b3d0cc@amd.com>
Date:   Wed, 25 Apr 2018 09:06:46 +0530
From:   "Agrawal, Akshu" <Akshu.Agrawal@....com>
To:     Daniel Kurtz <djkurtz@...omium.org>, Vijendar.Mukunda@....com
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, perex@...ex.cz,
        tiwai@...e.com, alexander.deucher@....com,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ASoC: AMD: Move clk enable from hw_params/free to
 startup/shutdown



On 4/24/2018 10:06 PM, Daniel Kurtz wrote:
> On Mon, Apr 23, 2018 at 9:03 PM Vijendar Mukunda <Vijendar.Mukunda@....com>
> wrote:
> 
>> From: Akshu Agrawal <akshu.agrawal@....com>
> 
>> hw_param can be called multiple times and thus we can have
>> more clk enable. The clk may not get diabled due to refcounting.
>> startup/shutdown ensures single clk enable/disable call.
> 
>> Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
>> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
>> ---
>>    sound/soc/amd/acp-da7219-max98357a.c | 54
> ++++++++++++++++++++++++------------
>>    1 file changed, 37 insertions(+), 17 deletions(-)
> 
>> diff --git a/sound/soc/amd/acp-da7219-max98357a.c
> b/sound/soc/amd/acp-da7219-max98357a.c
>> index b205c78..0f16f6d 100644
>> --- a/sound/soc/amd/acp-da7219-max98357a.c
>> +++ b/sound/soc/amd/acp-da7219-max98357a.c
>> @@ -38,8 +38,7 @@
>>    #include "../codecs/da7219.h"
>>    #include "../codecs/da7219-aad.h"
> 
>> -#define CZ_PLAT_CLK 24000000
>> -#define MCLK_RATE 24576000
>> +#define CZ_PLAT_CLK 25000000
>>    #define DUAL_CHANNEL           2
> 
>>    static struct snd_soc_jack cz_jack;
>> @@ -62,7 +61,7 @@ static int cz_da7219_init(struct snd_soc_pcm_runtime
> *rtd)
>>           }
> 
>>           ret = snd_soc_dai_set_pll(codec_dai, 0, DA7219_SYSCLK_PLL,
>> -                                 CZ_PLAT_CLK, MCLK_RATE);
>> +                                 CZ_PLAT_CLK, DA7219_PLL_FREQ_OUT_98304);
> 
> These are unrelated fixes that should be in their own patch.
> 
Accepted. Will split it.

>>           if (ret < 0) {
>>                   dev_err(rtd->dev, "can't set codec pll: %d\n", ret);
>>                   return ret;
>> @@ -85,8 +84,7 @@ static int cz_da7219_init(struct snd_soc_pcm_runtime
> *rtd)
>>           return 0;
>>    }
> 
>> -static int cz_da7219_hw_params(struct snd_pcm_substream *substream,
>> -                            struct snd_pcm_hw_params *params)
>> +static int da7219_clk_enable(struct snd_pcm_substream *substream)
>>    {
>>           int ret = 0;
>>           struct snd_soc_pcm_runtime *rtd = substream->private_data;
>> @@ -100,11 +98,9 @@ static int cz_da7219_hw_params(struct
> snd_pcm_substream *substream,
>>           return ret;
>>    }
> 
>> -static int cz_da7219_hw_free(struct snd_pcm_substream *substream)
>> +static void da7219_clk_disable(void)
>>    {
>>           clk_disable_unprepare(da7219_dai_clk);
>> -
>> -       return 0;
>>    }
> 
>>    static const unsigned int channels[] = {
>> @@ -127,7 +123,7 @@ static const struct snd_pcm_hw_constraint_list
> constraints_channels = {
>>           .mask = 0,
>>    };
> 
>> -static int cz_fe_startup(struct snd_pcm_substream *substream)
>> +static int cz_da7219_startup(struct snd_pcm_substream *substream)
>>    {
>>           struct snd_pcm_runtime *runtime = substream->runtime;
> 
>> @@ -141,23 +137,47 @@ static int cz_fe_startup(struct snd_pcm_substream
> *substream)
>>           snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
>>                                      &constraints_rates);
> 
>> -       return 0;
>> +       return da7219_clk_enable(substream);
>> +}
>> +
>> +static void cz_da7219_shutdown(struct snd_pcm_substream *substream)
>> +{
>> +       da7219_clk_disable();
>> +}
>> +
>> +static int cz_max_startup(struct snd_pcm_substream *substream)
>> +{
>> +       return da7219_clk_enable(substream);
>> +}
>> +
>> +static void cz_max_shutdown(struct snd_pcm_substream *substream)
>> +{
>> +       da7219_clk_disable();
>> +}
>> +
>> +static int cz_dmic_startup(struct snd_pcm_substream *substream)
>> +{
>> +       return da7219_clk_enable(substream);
>> +}
>> +
>> +static void cz_dmic_shutdown(struct snd_pcm_substream *substream)
>> +{
>> +       da7219_clk_disable();
>>    }
> 
> This is ok, or you could combine the common cz_max_* & cz_dmic_*.
> 
> 
Need to be separate as they have different cpu dai.

>>    static struct snd_soc_ops cz_da7219_cap_ops = {
> 
> I think these should all be "static const struct snd_soc_ops"  (please fix
> in a separate patch).
> 

Accepted. Will post another patch for same.

>> -       .hw_params = cz_da7219_hw_params,
>> -       .hw_free = cz_da7219_hw_free,
>> -       .startup = cz_fe_startup,
>> +       .startup = cz_da7219_startup,
>> +       .shutdown = cz_da7219_shutdown,
>>    };
> 
>>    static struct snd_soc_ops cz_max_play_ops = {
>> -       .hw_params = cz_da7219_hw_params,
>> -       .hw_free = cz_da7219_hw_free,
>> +       .startup = cz_max_startup,
>> +       .shutdown = cz_max_shutdown,
>>    };
> 
>>    static struct snd_soc_ops cz_dmic_cap_ops = {
>> -       .hw_params = cz_da7219_hw_params,
>> -       .hw_free = cz_da7219_hw_free,
>> +       .startup = cz_dmic_startup,
>> +       .shutdown = cz_dmic_shutdown,
>>    };
> 
>>    static struct snd_soc_dai_link cz_dai_7219_98357[] = {
>> --
>> 2.7.4

Thanks,
Akshu