linux-kernel - Re: [PATCH v2 2/2] ASoC: codecs: pcm186x: Fix energysense SLEEP bit

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Date:   Wed, 20 Feb 2019 10:56:55 +0000
From:   <Codrin.Ciubotariu@...rochip.com>
To:     <afd@...com>, <lgirdwood@...il.com>, <broonie@...nel.org>
CC:     <dannenberg@...com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] ASoC: codecs: pcm186x: Fix energysense SLEEP bit

On 19.02.2019 19:06, Andrew F. Davis wrote:
> On 2/19/19 10:29 AM, Codrin.Ciubotariu@...rochip.com wrote:
>> From: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
>>
>> The ADCs are sleeping when the SLEEP bit is set and running when it's
>> cleared, so the bit should be inverted.
>> Tested on pcm1863.
>>
> 
> Did this work for you before? Strange it would if reversed, I wonder if
> the SLEEP bit is really doing anything here. Can investigate later, for
> this patch:

The SLEEP bit seems to work. At least STATE from register 114 says the 
IP is sleeping. Without this change, if pcm1863 is used as master, I can 
see BCK and LRCK generated while no sound is played. Once I start an 
audio stream, the clocks stop.

Thank you for your ACK. I would really appreciate if you could also test 
it on your side.

Best regards,
Codrin

> 
> Acked-by: Andrew F. Davis <afd@...com>
> 
>> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
>> ---
>>
>> Changes in v2:
>>   - none;
>>
>>   sound/soc/codecs/pcm186x.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/sound/soc/codecs/pcm186x.c b/sound/soc/codecs/pcm186x.c
>> index c36a391fec8a..c5fcc632f670 100644
>> --- a/sound/soc/codecs/pcm186x.c
>> +++ b/sound/soc/codecs/pcm186x.c
>> @@ -158,7 +158,7 @@ static const struct snd_soc_dapm_widget pcm1863_dapm_widgets[] = {
>>   	 * Put the codec into SLEEP mode when not in use, allowing the
>>   	 * Energysense mechanism to operate.
>>   	 */
>> -	SND_SOC_DAPM_ADC("ADC", "HiFi Capture", PCM186X_POWER_CTRL, 1,  0),
>> +	SND_SOC_DAPM_ADC("ADC", "HiFi Capture", PCM186X_POWER_CTRL, 1,  1),
>>   };
>>   
>>   static const struct snd_soc_dapm_widget pcm1865_dapm_widgets[] = {
>> @@ -184,8 +184,8 @@ static const struct snd_soc_dapm_widget pcm1865_dapm_widgets[] = {
>>   	 * Put the codec into SLEEP mode when not in use, allowing the
>>   	 * Energysense mechanism to operate.
>>   	 */
>> -	SND_SOC_DAPM_ADC("ADC1", "HiFi Capture 1", PCM186X_POWER_CTRL, 1,  0),
>> -	SND_SOC_DAPM_ADC("ADC2", "HiFi Capture 2", PCM186X_POWER_CTRL, 1,  0),
>> +	SND_SOC_DAPM_ADC("ADC1", "HiFi Capture 1", PCM186X_POWER_CTRL, 1,  1),
>> +	SND_SOC_DAPM_ADC("ADC2", "HiFi Capture 2", PCM186X_POWER_CTRL, 1,  1),
>>   };
>>   
>>   static const struct snd_soc_dapm_route pcm1863_dapm_routes[] = {
>>