linux-kernel - Re: [PATCH] ASoC: rt5659: add S32

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Message-ID: <c700f22c-a053-7f39-dddf-41abe52cad77@nvidia.com>
Date:   Wed, 22 Jan 2020 15:57:14 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <oder_chiou@...ltek.com>, <tiwai@...e.com>, <perex@...ex.cz>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: rt5659: add S32_LE format

Hi Reviewers,

Kindly review. Thanks.

On 1/20/2020 11:54 AM, Sameer Pujar wrote:
> Removing Bard(bardliao@...ltek.com) from "to" list since I am getting 
> undelivered message.
>
> Oder,
> Please add right folks as you feel necessary. Thanks.
>
> On 1/20/2020 11:47 AM, Sameer Pujar wrote:
>> ALC5659 supports maximum data length of 24-bit. Currently driver 
>> supports
>> S24_LE which is a 32-bit container with valid data in [23:0] and 0s 
>> in MSB.
>> S24_3LE is not commonly used and is hard to find audio streams with this
>> format. Also many SoC HW do not support S24_LE and S32_LE is used in
>> general. The 24-bit data can be represented in S32_LE [31:8] and 0s are
>> padded in LSB.
>>
>> This patch adds S32_LE to ALC5659 driver and data length for this is set
>> to 24 as per codec's maximum data length support. This helps to play
>> 24-bit audio, packed in S32_LE, on HW which do not support S24_LE.
>>
>> Signed-off-by: Sameer Pujar <spujar@...dia.com>
>> ---
>>   sound/soc/codecs/rt5659.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/sound/soc/codecs/rt5659.c b/sound/soc/codecs/rt5659.c
>> index fc74dd63..f910ddf 100644
>> --- a/sound/soc/codecs/rt5659.c
>> +++ b/sound/soc/codecs/rt5659.c
>> @@ -3339,6 +3339,7 @@ static int rt5659_hw_params(struct 
>> snd_pcm_substream *substream,
>>           val_len |= RT5659_I2S_DL_20;
>>           break;
>>       case 24:
>> +    case 32:
>>           val_len |= RT5659_I2S_DL_24;
>>           break;
>>       case 8:
>> @@ -3733,7 +3734,8 @@ static int rt5659_resume(struct 
>> snd_soc_component *component)
>>     #define RT5659_STEREO_RATES SNDRV_PCM_RATE_8000_192000
>>   #define RT5659_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | 
>> SNDRV_PCM_FMTBIT_S20_3LE | \
>> -        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S8)
>> +        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE | \
>> +        SNDRV_PCM_FMTBIT_S8)
>>     static const struct snd_soc_dai_ops rt5659_aif_dai_ops = {
>>       .hw_params = rt5659_hw_params,