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

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Message-ID: <320ab7cc-32dd-79dd-b2ae-96d3608aeb9c@collabora.com>
Date:   Wed, 26 Jul 2023 08:43:54 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Trevor Wu (吳文良) <Trevor.Wu@...iatek.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "perex@...ex.cz" <perex@...ex.cz>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH 1/3] ASoC: mediatek: mt8188-mt6359: support dynamic
 pinctrl

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@...iatek.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