linux-kernel - Re: [PATCH v2 -next] soc: mediatek: SVS: Use the new PM macros

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Message-ID: <d17549d3-a111-53b4-4576-2f5b6581c830@gmail.com>
Date:   Thu, 23 Jun 2022 13:59:49 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Jin Xiaoyun <jinxiaoyun2@...wei.com>,
        angelogioacchino.delregno@...labora.com, khilman@...libre.com,
        zhengbin13@...wei.com, gaochao49@...wei.com
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 -next] soc: mediatek: SVS: Use the new PM macros



On 23/06/2022 05:09, Jin Xiaoyun wrote:
> Use DEFINE_SIMPLE_DEV_PM_OPS() instead of the SIMPLE_DEV_PM_OPS()
> macro, along with using pm_sleep_ptr() as this driver doesn't handle
> runtime PM.
> 
> Fix build error:
> drivers/soc/mediatek/mtk-svs.c:1515:12: error: ‘svs_resume’ defined but not used [-Werror=unused-function]
> drivers/soc/mediatek/mtk-svs.c:1481:12: error: ‘svs_suspend’ defined but not used [-Werror=unused-function]
> 
> Signed-off-by: Jin Xiaoyun <jinxiaoyun2@...wei.com>
> Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> ---
> v1->v2:
> - Remove the #ifdef CONFIG_PM guard around the suspend/resume functions
> - Use DEFINE_SIMPLE_DEV_PM_OPS along with using pm_sleep_ptr()
> ---
>   drivers/soc/mediatek/mtk-svs.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
> index 606a00a2e57d..fae7376bd083 100644
> --- a/drivers/soc/mediatek/mtk-svs.c
> +++ b/drivers/soc/mediatek/mtk-svs.c
> @@ -2381,13 +2381,13 @@ static int svs_probe(struct platform_device *pdev)
>   	return ret;
>   }
> 
> -static SIMPLE_DEV_PM_OPS(svs_pm_ops, svs_suspend, svs_resume);
> +static DEFINE_SIMPLE_DEV_PM_OPS(svs_pm_ops, svs_suspend, svs_resume);
> 
>   static struct platform_driver svs_driver = {
>   	.probe	= svs_probe,
>   	.driver	= {
>   		.name		= "mtk-svs",
> -		.pm		= &svs_pm_ops,
> +		.pm		= pm_sleep_ptr(&svs_pm_ops),

Why do we need that? From my understanding DEFINE_SIMPLE_DEV_PM_OPS() sets 
runtime_suspend_fn, runtime_resume_fn and idle_fn to NULL.

Regards,
Matthias

>   		.of_match_table	= of_match_ptr(svs_of_match),
>   	},
>   };
> --
> 2.25.1
>