linux-kernel - Re: [PATCH 2/5] ASoC: mediatek: mt8188-mt6359: register hdmi/dp jack pins

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Date:   Thu, 18 May 2023 02:01:18 +0000
From:   Trevor Wu (吳文良) <Trevor.Wu@...iatek.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
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>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/5] ASoC: mediatek: mt8188-mt6359: register hdmi/dp jack
 pins

On Wed, 2023-05-17 at 17:10 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> Il 17/05/23 14:10, Trevor Wu (吳文良) ha scritto:
> > On Wed, 2023-05-17 at 13:31 +0200, AngeloGioacchino Del Regno
> > wrote:
> > > External email : Please do not click links or open attachments
> > > until
> > > you have verified the sender or the content.
> > > 
> > > 
> > > Il 17/05/23 13:15, Trevor Wu ha scritto:
> > > > Some userspace applications need jack control events, so
> > > > register
> > > > hdmi
> > > > and dp jack pins to activate jack control events.
> > > > 
> > > > Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
> > > > ---
> > > >    sound/soc/mediatek/mt8188/mt8188-mt6359.c | 27
> > > > +++++++++++++++++++----
> > > >    1 file changed, 23 insertions(+), 4 deletions(-)
> > > > 
> > > > diff --git a/sound/soc/mediatek/mt8188/mt8188-mt6359.c
> > > > b/sound/soc/mediatek/mt8188/mt8188-mt6359.c
> > > > index 833bc362dad2..6c3f36e2fffd 100644
> > > > --- a/sound/soc/mediatek/mt8188/mt8188-mt6359.c
> > > > +++ b/sound/soc/mediatek/mt8188/mt8188-mt6359.c
> > > > @@ -151,6 +151,20 @@ struct mt8188_mt6359_priv {
> > > >        struct snd_soc_jack hdmi_jack;
> > > >    };
> > > > 
> > > > +static struct snd_soc_jack_pin mt8188_hdmi_jack_pins[] = {
> > > > +     {
> > > > +             .pin = "HDMI",
> > > 
> > > "HDMI Jack" is more consistent with the snd_soc_jack_new_pins()
> > > call
> > > performed
> > > later.
> > 
> > Hi Angelo,
> > 
> > I see jack_kctl_name_gen() will append "Jack" to the name if I
> > don't
> > name the pin "HDMI Jack". Do you mean that I could directly use
> > "HDMI
> > Jack" because ALSA uses the name finally?
> > 
> 
> You're right and I just checked; the comment even says
> 'remove redundant " Jack" from src_name'
> 
> So yes, the current names are fine. Sorry about that.
> 
> Regards,
> Angelo

I checked the original commit[1] for the function. The purpose of
jack_kctl_name_gen() is to ensure only one "Jack" shown in kctrl_name.
If "Jack" is already found in src_name, don't append "Jack" again.

I'm not sure which is better for pin name, but it's certain they get
the same kctrl_name finally.

[1] 
https://lore.kernel.org/all/1430140862-17207-3-git-send-email-yang.jie@intel.com


Thanks,
Trevor