Re: [PATCH] ALSA: hda/realtek: Add quirk for CSL Unity BF24B

[Takashi Iwai <tiwai@suse.de>]

On Thu, 09 Apr 2026 04:40:28 +0200,
Zhang Heng wrote:
> 
> The CSL Unity BF24B all-in-one PC uses a Realtek ALC662 rev3 audio
> codec and requires the correct GPIO configuration to enable sound
> output from both the speakers and the headphone.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=221258
> Signed-off-by: Zhang Heng <zhangheng@kylinos.cn>
> ---
>  sound/hda/codecs/realtek/alc662.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/sound/hda/codecs/realtek/alc662.c b/sound/hda/codecs/realtek/alc662.c
> index 5073165d1f3c..3abe41c7315c 100644
> --- a/sound/hda/codecs/realtek/alc662.c
> +++ b/sound/hda/codecs/realtek/alc662.c
> @@ -255,6 +255,25 @@ static void alc_fixup_headset_mode_alc668(struct hda_codec *codec,
>  	alc_fixup_headset_mode(codec, fix, action);
>  }
>  
> +static void alc662_fixup_csl_amp(struct hda_codec *codec,
> +				 const struct hda_fixup *fix, int action)
> +{
> +	struct alc_spec *spec = codec->spec;
> +
> +	switch (action) {
> +	case HDA_FIXUP_ACT_PRE_PROBE:
> +		spec->gpio_mask |= 0x03;
> +		spec->gpio_dir |= 0x03;
> +		break;

Do we need to set gpio_mask and gpio_dir explicitly for this bit?
Looking at the rest of the patch...

> +	case HDA_FIXUP_ACT_INIT:
> +		/* need to toggle GPIO to enable the amp */
> +		alc_update_gpio_data(codec, 0x03, true);
> +		msleep(100);
> +		alc_update_gpio_data(codec, 0x03, false);
> +		break;

... here is the only place to fiddle with this GPIO bit, and it's used
for gating.  OTOH, spec->gpio_mask, gpio_dir and gpio_data are used at
alc_write_gpio() that is called from alc_init(), and IIUC, this bit
doesn't have to be initialized there.


thanks,

Takashi