Re: [PATCH 1/3] ASoC: mediatek: mt8188-mt6359: support dynamic pinctrl

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 26/07/23 04:19, Trevor Wu (吳文良) ha scritto:
> On Tue, 2023-07-25 at 09:06 +0200, AngeloGioacchino Del Regno wrote:
>> Il 25/07/23 05:53, Trevor Wu ha scritto:
>>> To avoid power leakage, it is recommended to replace the default
>>> pinctrl
>>> state with dynamic pinctrl since certain audio pinmux functions can
>>> remain in a HIGH state even when audio is disabled. Linking pinctrl
>>> with
>>> DAPM using SND_SOC_DAPM_PINCTRL will ensure that audio pins remain
>>> in
>>> GPIO mode by default and only switch to an audio function when
>>> necessary.
>>>
>>> Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
>>> ---
>>>    sound/soc/mediatek/mt8188/mt8188-mt6359.c | 21
>>> +++++++++++++++++++++
>>>    1 file changed, 21 insertions(+)
>>>
>>> diff --git a/sound/soc/mediatek/mt8188/mt8188-mt6359.c
>>> b/sound/soc/mediatek/mt8188/mt8188-mt6359.c
>>> index 7c9e08e6a4f5..667d79f33bf2 100644
>>> --- a/sound/soc/mediatek/mt8188/mt8188-mt6359.c
>>> +++ b/sound/soc/mediatek/mt8188/mt8188-mt6359.c
>>> @@ -246,6 +246,11 @@ static const struct snd_soc_dapm_widget
>>> mt8188_mt6359_widgets[] = {
>>>    	SND_SOC_DAPM_MIC("Headset Mic", NULL),
>>>    	SND_SOC_DAPM_SINK("HDMI"),
>>>    	SND_SOC_DAPM_SINK("DP"),
>>> +
>>> +	/* dynamic pinctrl */
>>> +	SND_SOC_DAPM_PINCTRL("ETDM_SPK_PIN", "aud_etdm_spk_on",
>>> "aud_etdm_spk_off"),
>>> +	SND_SOC_DAPM_PINCTRL("ETDM_HP_PIN", "aud_etdm_hp_on",
>>> "aud_etdm_hp_off"),
>>> +	SND_SOC_DAPM_PINCTRL("MTKAIF_PIN", "aud_mtkaif_on",
>>> "aud_mtkaif_off"),
>>>    };
>>>    
>>>    static const struct snd_kcontrol_new mt8188_mt6359_controls[] = {
>>> @@ -267,6 +272,7 @@ static int
>>> mt8188_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
>>>    		snd_soc_rtdcom_lookup(rtd, AFE_PCM_NAME);
>>>    	struct snd_soc_component *cmpnt_codec =
>>>    		asoc_rtd_to_codec(rtd, 0)->component;
>>> +	struct snd_soc_dapm_widget *pin_w = NULL, *w;
>>>    	struct mtk_base_afe *afe;
>>>    	struct mt8188_afe_private *afe_priv;
>>>    	struct mtkaif_param *param;
>>> @@ -306,6 +312,18 @@ static int
>>> mt8188_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
>>>    		return 0;
>>>    	}
>>>    
>>> +	for_each_card_widgets(rtd->card, w) {
>>> +		if (!strcmp(w->name, "MTKAIF_PIN")) {
>>
>> if (strncmp(w->name, "MTKAIF_PIN", strlen(w->name) == 0) {
>> 	pin_w = w;
>> 	break;
>> }
>>
>> That's safer.
>>
> 
> If w->name is MTKAIF, the strncmp expression will return 0. However,
> the result is not expected. I prefer to keep strcmp here.
> 

You could also do, instead

if (strncmp(w->name, "MTKAIF_PIN", strlen("MTKAIF_PIN") == 0))

...solving your concern.

Regards,
Angelo

>>> +			pin_w = w;
>>> +			break;
>>> +		}
>>> +	}
>>> +
>>> +	if (!pin_w)
>>
>> Just a nitpick: you're checking for `if (pin_w)` later in this
>> function, so
>> to increase readability please do the same here.
>>
>> if (pin_w)
>> 	dapm_pinctrl_event(...)
>> else
>> 	dev_dbg(...)
>>
> 
> OK. I will update it in v2.
> 
> Thanks,
> Trevor