Re: [PATCH] ASoC: qcom: sc8280xp: enable primary mi2s

["Luca Weiss" <luca.weiss@fairphone.com>]

On Mon Feb 3, 2025 at 5:33 PM CET, Danila Tikhonov wrote:
> On 03/02/2025 17:23, neil.armstrong@linaro.org wrote:
>> On 03/02/2025 12:38, Danila Tikhonov wrote:
>>> When using primary mi2s on sc8280xp-compatible SoCs, the correct clock
>>> needs to get enabled to be able to use the mi2s interface.
>>>
>>> Signed-off-by: Danila Tikhonov <danila@jiaxyga.com>
>>> ---
>>>   sound/soc/qcom/sc8280xp.c | 13 +++++++++++++
>>>   1 file changed, 13 insertions(+)
>>>
>>> diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c
>>> index 311377317176..03687de1ebb0 100644
>>> --- a/sound/soc/qcom/sc8280xp.c
>>> +++ b/sound/soc/qcom/sc8280xp.c
>>> @@ -14,6 +14,8 @@
>>>   #include "common.h"
>>>   #include "sdw.h"
>>>   +#define MI2S_BCLK_RATE    1536000
>>> +
>>>   struct sc8280xp_snd_data {
>>>       bool stream_prepared[AFE_PORT_MAX];
>>>       struct snd_soc_card *card;
>>> @@ -25,13 +27,24 @@ struct sc8280xp_snd_data {
>>>     static int sc8280xp_snd_init(struct snd_soc_pcm_runtime *rtd)
>>>   {
>>> +    unsigned int codec_dai_fmt = SND_SOC_DAIFMT_BC_FC;
>>> +    unsigned int fmt = SND_SOC_DAIFMT_BP_FP;
>>>       struct sc8280xp_snd_data *data = 
>>> snd_soc_card_get_drvdata(rtd->card);
>>> +    struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
>>>       struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
>>>       struct snd_soc_card *card = rtd->card;
>>>       struct snd_soc_jack *dp_jack  = NULL;
>>>       int dp_pcm_id = 0;
>>>         switch (cpu_dai->id) {
>>> +    case PRIMARY_MI2S_RX:
>>> +        codec_dai_fmt |= SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_I2S;
>>> +        snd_soc_dai_set_sysclk(cpu_dai,
>>> +            Q6AFE_LPASS_CLK_ID_PRI_MI2S_IBIT,
>>> +            MI2S_BCLK_RATE, SNDRV_PCM_STREAM_PLAYBACK);
>>
>> How is this possible ? sc8280xp uses the q6prm clock driver, and 
>> there's no
>> way this call sets the Q6PRM_LPASS_CLK_ID_PRI_MI2S_IBIT, or I totally 
>> missed
>> something.
>>
>> And prm is neither a dai nor has the set_sysclk callback.
>>
>> Neil
>>
> Oh, thanks for the answer.
>
> This comes from qcm6490 compatibility. Actually it is needed for
> Nothing Phone (1) and Luca Weiss just suggested me to use
> qcom,qcm6490-idp-sndcard like do they do it for FP5. (SM7325 is the
> closest to QCM6490):
> https://github.com/sc7280-mainline/linux/pull/5#discussion_r1848984788
> Actually I also think it is a bit incorrect.

For reference, this is coming from this and following:
https://lore.kernel.org/linux-arm-msm/e8a24709-de96-4d09-ba00-1e084a656c68@kernel.org/

Regards
Luca

>
> ---
> Regards,
> Danila
>>> +        snd_soc_dai_set_fmt(cpu_dai, fmt);
>>> +        snd_soc_dai_set_fmt(codec_dai, codec_dai_fmt);
>>> +        break;
>>>       case WSA_CODEC_DMA_RX_0:
>>>       case WSA_CODEC_DMA_RX_1:
>>>           /*
>>