linux-kernel - Re: [PATCH 3/4] ASoC: amd: acp: Add machine driver that enables sound for systems with a ES8336 codec

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Date:   Thu, 23 Mar 2023 09:56:56 +0800
From:   沈一超 <zhuning0077@...il.com>
To:     broonie@...nel.org
Cc:     alsa-devel@...a-project.org, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org, perex@...ex.cz, posteuca@...ex.one,
        tiwai@...e.com, yangxiaohua <yangxiaohua@...rest-semi.com>,
        沈一超 <zhuning0077@...il.com>,
        Zhu Ning <zhuning@...rest-semi.com>
Subject: Re: [PATCH 3/4] ASoC: amd: acp: Add machine driver that enables sound
 for systems with a ES8336 codec

> > Regarding playing the speaker and headphone simultaneously, is not
> > something I took into account. Is this even a valid usecase? The intel driver
> > for es8336 doesn't seem to support it.
>
> Yes, for example consider a critical notification - the system
> may wish to ensure it is audible even if the user has taken off
> their headphones for some reason.

In practice the speaker and the headphone are conflicting devices, see
https://github.com/alsa-project/alsa-ucm-conf/blob/master/ucm2/Intel/sof-essx8336/HiFi.conf

There is no such situation, and the system doesn't produce sound from speaker
when headphones are plugged in. The user may manually open speaker using
amixer sset 'Speaker' on or pavucontrol.

The GPIO thing on Huawei Intel platform is too complicated, they use two GPIOs
for headphone and speaker, and the headphone GPIO is inverted, which means low
means on and high means off. Luckily there should be only one hardware config
for the AMD acp3x platform GPIO and you may just choose the correct one.