linux-kernel - Re: [PATCH 2/7] ASoC: mediatek: mt8173-afe-pcm: Use devm_snd_soc_register

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Message-ID: <CAGXv+5Grq8XrpP9yssduXtetxWBb3PB1z7O6rvvaW=CcSPB8Dg@mail.gmail.com>
Date: Fri, 12 Jan 2024 16:17:40 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz, tiwai@...e.com, 
	matthias.bgg@...il.com, ribalda@...omium.org, nicolas.ferre@...rochip.com, 
	u.kleine-koenig@...gutronix.de, kuninori.morimoto.gx@...esas.com, 
	nfraprado@...labora.com, alsa-devel@...a-project.org, trevor.wu@...iatek.com, 
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/7] ASoC: mediatek: mt8173-afe-pcm: Use devm_snd_soc_register_component()

On Thu, Jan 11, 2024 at 6:53 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Function devm_snd_soc_register_component() allocates a new struct
> snd_soc_component, adds components and initializes them; since this
> is also devm, it automatically unregisters components and frees
> memory upon destruction.
>
> That's exactly what we're doing in the probe function of this driver:
> switch to that function instead, allowing to remove the last goto and
> to discard the .remove_new() callback for this driver.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  sound/soc/mediatek/mt8173/mt8173-afe-pcm.c | 58 +++-------------------
>  1 file changed, 8 insertions(+), 50 deletions(-)
>
> diff --git a/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c b/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c
> index ea611730de9c..b887e10635fe 100644
> --- a/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c
> +++ b/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c
> @@ -1129,72 +1129,31 @@ static int mt8173_afe_pcm_dev_probe(struct platform_device *pdev)
>         afe->runtime_resume = mt8173_afe_runtime_resume;
>         afe->runtime_suspend = mt8173_afe_runtime_suspend;
>
> -       ret = devm_snd_soc_register_component(&pdev->dev,
> -                                        &mtk_afe_pcm_platform,
> -                                        NULL, 0);
> +       ret = devm_snd_soc_register_component(&pdev->dev, &mtk_afe_pcm_platform, NULL, 0);
>         if (ret)
>                 return ret;
>
> -       comp_pcm = devm_kzalloc(&pdev->dev, sizeof(*comp_pcm), GFP_KERNEL);
> -       if (!comp_pcm)
> -               return -ENOMEM;
> -
> -       ret = snd_soc_component_initialize(comp_pcm,
> -                                          &mt8173_afe_pcm_dai_component,
> -                                          &pdev->dev);
> +       ret = devm_snd_soc_register_component(&pdev->dev, &mt8173_afe_pcm_dai_component,
> +                                             mt8173_afe_pcm_dais,
> +                                             ARRAY_SIZE(mt8173_afe_pcm_dais));
>         if (ret)
>                 return ret;
>
> -#ifdef CONFIG_DEBUG_FS
> -       comp_pcm->debugfs_prefix = "pcm";
> -#endif

To match existing behavior, can you move this to the component driver?
In snd_soc_component_initialize(), component->debugfs_prefix will take
component_driver->debugfs_prefix as default if it is not set.

Same for the HDMI component.

ChenYu

> -
> -       ret = snd_soc_add_component(comp_pcm,
> -                                   mt8173_afe_pcm_dais,
> -                                   ARRAY_SIZE(mt8173_afe_pcm_dais));
> +       ret = devm_snd_soc_register_component(&pdev->dev, &mt8173_afe_hdmi_dai_component,
> +                                             mt8173_afe_hdmi_dais,
> +                                             ARRAY_SIZE(mt8173_afe_hdmi_dais));
>         if (ret)
>                 return ret;
>
> -       comp_hdmi = devm_kzalloc(&pdev->dev, sizeof(*comp_hdmi), GFP_KERNEL);
> -       if (!comp_hdmi) {
> -               ret = -ENOMEM;
> -               goto err_cleanup_components;
> -       }
> -
> -       ret = snd_soc_component_initialize(comp_hdmi,
> -                                          &mt8173_afe_hdmi_dai_component,
> -                                          &pdev->dev);
> -       if (ret)
> -               goto err_cleanup_components;
> -
> -#ifdef CONFIG_DEBUG_FS
> -       comp_hdmi->debugfs_prefix = "hdmi";
> -#endif
> -
> -       ret = snd_soc_add_component(comp_hdmi,
> -                                   mt8173_afe_hdmi_dais,
> -                                   ARRAY_SIZE(mt8173_afe_hdmi_dais));
> -       if (ret)
> -               goto err_cleanup_components;
> -
>         ret = devm_request_irq(afe->dev, irq_id, mt8173_afe_irq_handler,
>                                0, "Afe_ISR_Handle", (void *)afe);
>         if (ret) {
>                 dev_err(afe->dev, "could not request_irq\n");
> -               goto err_cleanup_components;
> +               return ret;
>         }
>
>         dev_info(&pdev->dev, "MT8173 AFE driver initialized.\n");
>         return 0;
> -
> -err_cleanup_components:
> -       snd_soc_unregister_component(&pdev->dev);
> -       return ret;
> -}
> -
> -static void mt8173_afe_pcm_dev_remove(struct platform_device *pdev)
> -{
> -       snd_soc_unregister_component(&pdev->dev);
>  }
>
>  static const struct of_device_id mt8173_afe_pcm_dt_match[] = {
> @@ -1215,7 +1174,6 @@ static struct platform_driver mt8173_afe_pcm_driver = {
>                    .pm = &mt8173_afe_pm_ops,
>         },
>         .probe = mt8173_afe_pcm_dev_probe,
> -       .remove_new = mt8173_afe_pcm_dev_remove,
>  };
>
>  module_platform_driver(mt8173_afe_pcm_driver);
> --
> 2.43.0
>
>