[alsa-devel] [PATCH] ASoC: adau1701: Add 44.1 KHz to supported sample rates

[Pascal Huerst]

On 20.10.2015 11:10, Lars-Peter Clausen wrote:
> On 10/15/2015 01:16 PM, pascal.huerst at gmail.com wrote:
>> From: Pascal Huerst <pascal.huerst at gmail.com>
>>
>> According to the datasheet, this device does also support 44.1 KHz
>> as sample rate. This adds the necessary changes to support this.
>>
>> See Datasheet: Rev. B / page 39 / SR[1:0]
>>
>> Signed-off-by: Pascal Huerst <pascal.huerst at gmail.com>
> 
> Hm, right. The sample rates that part can run at depend on the external
> clock rate. It can run at ext_clk / 256, ext_clk / 128 or ext_clk / 64.
> Maybe we should just implement it like that.

Don't you think, that it is just consistent to add 44100, just as the
other sample rates that are supported?

> Do you have support for switching the external clock at runtime on your
> platform?
> 
>> ---
>>  sound/soc/codecs/adau1701.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/sound/soc/codecs/adau1701.c b/sound/soc/codecs/adau1701.c
>> index de53c0d..8b3ba51 100644
>> --- a/sound/soc/codecs/adau1701.c
>> +++ b/sound/soc/codecs/adau1701.c
>> @@ -459,6 +459,7 @@ static int adau1701_hw_params(struct snd_pcm_substream *substream,
>>  	case 96000:
>>  		val = ADAU1701_DSPCTRL_SR_96;
>>  		break;
>> +	case 44100:
>>  	case 48000:
>>  		val = ADAU1701_DSPCTRL_SR_48;
>>  		break;
>> @@ -623,8 +624,8 @@ static int adau1701_startup(struct snd_pcm_substream *substream,
>>  	return sigmadsp_restrict_params(adau1701->sigmadsp, substream);
>>  }
>>  
>> -#define ADAU1701_RATES (SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
>> -	SNDRV_PCM_RATE_192000)
>> +#define ADAU1701_RATES (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
>> +	SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000)
>>  
>>  #define ADAU1701_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
>>  	SNDRV_PCM_FMTBIT_S24_LE)
>>
>