linux-kernel - Re: [PATCH 2/2] ASoC: max98088: fix initial dai mute state

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Date:   Tue, 13 Dec 2022 12:01:45 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Rouven Czerwinski <r.czerwinski@...gutronix.de>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, kernel@...gutronix.de,
        Marco Felsch <m.felsch@...gutronix.de>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ASoC: max98088: fix initial dai mute state

On Tue, Dec 13, 2022 at 10:53:28AM +0100, Rouven Czerwinski wrote:

> To fix that we need to explicit set the mute state. Now the first
> playback request gets played correctly.

> +++ b/sound/soc/codecs/max98088.c
> @@ -1710,6 +1710,11 @@ static int max98088_probe(struct snd_soc_component *component)
>         snd_soc_component_write(component, M98088_REG_1E_DAI2_IOCFG,
>                 M98088_S2NORMAL|M98088_SDATA);
>  
> +       snd_soc_component_update_bits(component, M98088_REG_2F_LVL_DAI1_PLAY,
> +               M98088_DAI_MUTE_MASK, M98088_DAI_MUTE);
> +       snd_soc_component_update_bits(component, M98088_REG_31_LVL_DAI2_PLAY,
> +               M98088_DAI_MUTE_MASK, M98088_DAI_MUTE);
> +

Won't this be broken again after suspend?  The device gets powered off
over suspend, then when it powers on again with the output unmuted
nothing will do another write since the register is already in the state
in the cache.

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