linux-kernel - Re: [PATCH] ASoC: amd: yc: Fix for enabling DMIC on acp6x via

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Message-ID: <a6036171-2dfd-4296-9fe4-242c306e5449@perex.cz>
Date: Wed, 27 Nov 2024 13:36:10 +0100
From: Jaroslav Kysela <perex@...ex.cz>
To: Venkata Prasad Potturu <venkataprasad.potturu@....com>,
 broonie@...nel.org, alsa-devel@...a-project.org
Cc: Vijendar.Mukunda@....com, Basavaraj.Hiregoudar@....com,
 Sunil-kumar.Dommati@....com, syed.sabakareem@....com,
 mario.limonciello@....com, Liam Girdwood <lgirdwood@...il.com>,
 Takashi Iwai <tiwai@...e.com>, Tim Crawford <tcrawford@...tem76.com>,
 Attila Tőkés <attitokes@...il.com>,
 Techno Mooney <techno.mooney@...il.com>, Jeremy Soller
 <jeremy@...tem76.com>, Malcolm Hart <malcolm@...rts.com>,
 "open list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..."
 <linux-sound@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: amd: yc: Fix for enabling DMIC on acp6x via _DSD
 entry

On 27. 11. 24 12:22, Venkata Prasad Potturu wrote:
> Add condition check to register ACP PDM sound card by reading
> _WOV acpi entry.
> 
> Fixes: 5426f506b584 ("ASoC: amd: Add support for enabling DMIC on acp6x via _DSD")
> 
> Signed-off-by: Venkata Prasad Potturu <venkataprasad.potturu@....com>
> ---
>   sound/soc/amd/yc/acp6x-mach.c | 18 +++++++++++++++++-
>   1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/amd/yc/acp6x-mach.c b/sound/soc/amd/yc/acp6x-mach.c
> index 438865d5e376..c301dac8b979 100644
> --- a/sound/soc/amd/yc/acp6x-mach.c
> +++ b/sound/soc/amd/yc/acp6x-mach.c
> @@ -523,8 +523,14 @@ static int acp6x_probe(struct platform_device *pdev)
>   	struct acp6x_pdm *machine = NULL;
>   	struct snd_soc_card *card;
>   	struct acpi_device *adev;
> +	acpi_handle handle;
> +	acpi_integer dmic_status;
>   	int ret;
> +	bool is_dmic_enable, wov_en;
>   
> +	/* IF WOV entry not found, enable dmic based on AcpDmicConnected entry*/
> +	is_dmic_enable = false;
> +	wov_en = true;
>   	/* check the parent device's firmware node has _DSD or not */
>   	adev = ACPI_COMPANION(pdev->dev.parent);
>   	if (adev) {
> @@ -532,9 +538,19 @@ static int acp6x_probe(struct platform_device *pdev)
>   
>   		if (!acpi_dev_get_property(adev, "AcpDmicConnected", ACPI_TYPE_INTEGER, &obj) &&
>   		    obj->integer.value == 1)
> -			platform_set_drvdata(pdev, &acp6x_card);
> +			is_dmic_enable = true;
>   	}
>   
> +	handle = ACPI_HANDLE(pdev->dev.parent);
> +	ret = acpi_evaluate_integer(handle, "_WOV", NULL, &dmic_status);
> +	if (!ACPI_FAILURE(ret))
> +		wov_en = dmic_status;
> +
> +	if (is_dmic_enable && wov_en)
> +		platform_set_drvdata(pdev, &acp6x_card);
> +	else
> +		return 0;

The logic seems wrong. The overrides code bellow won't be executed when ACPI 
_WOV data are not set. I think that it may cause regressions for some BIOS 
versions.

Also, the return code should be probably -ENODEV.

					Jaroslav

-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.