linux-kernel - Re: [PATCH] amba: bus: Drop dev_pm_domain

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Message-ID: <CAPDyKFr1VJRS2hV4Yyx_sxwSLfc0cpH5-6Bh4iO7PvWeBXoxGA@mail.gmail.com>
Date: Wed, 27 Aug 2025 13:35:16 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: linux@...linux.org.uk, chentao@...inos.cn, 
	claudiu.beznea.uj@...renesas.com, rmk+kernel@...linux.org.uk, jroedel@...e.de, 
	lpieralisi@...nel.org, robin.murphy@....com, rafael@...nel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] amba: bus: Drop dev_pm_domain_detach() call

On Wed, 27 Aug 2025 at 12:03, Claudiu <claudiu.beznea@...on.dev> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> Starting with commit f99508074e78 ("PM: domains: Detach on
> device_unbind_cleanup()"), there is no longer a need to call
> dev_pm_domain_detach() in the bus remove function. The
> device_unbind_cleanup() function now handles this to avoid
> invoking devres cleanup handlers while the PM domain is
> powered off, which could otherwise lead to failures as
> described in the above-mentioned commit.
>
> Drop the explicit dev_pm_domain_detach() call and rely instead
> on the flags passed to dev_pm_domain_attach() to power off the
> domain.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

If it helps, let me know if you want me to pick this up via my pmdomain tree.

Kind regards
Uffe


> ---
>  drivers/amba/bus.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
> index 74e34a07ef72..952c45ca6e48 100644
> --- a/drivers/amba/bus.c
> +++ b/drivers/amba/bus.c
> @@ -291,15 +291,14 @@ static int amba_probe(struct device *dev)
>                 if (ret < 0)
>                         break;
>
> -               ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> +               ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON |
> +                                               PD_FLAG_DETACH_POWER_OFF);
>                 if (ret)
>                         break;
>
>                 ret = amba_get_enable_pclk(pcdev);
> -               if (ret) {
> -                       dev_pm_domain_detach(dev, true);
> +               if (ret)
>                         break;
> -               }
>
>                 pm_runtime_get_noresume(dev);
>                 pm_runtime_set_active(dev);
> @@ -314,7 +313,6 @@ static int amba_probe(struct device *dev)
>                 pm_runtime_put_noidle(dev);
>
>                 amba_put_disable_pclk(pcdev);
> -               dev_pm_domain_detach(dev, true);
>         } while (0);
>
>         return ret;
> @@ -336,7 +334,6 @@ static void amba_remove(struct device *dev)
>         pm_runtime_put_noidle(dev);
>
>         amba_put_disable_pclk(pcdev);
> -       dev_pm_domain_detach(dev, true);
>  }
>
>  static void amba_shutdown(struct device *dev)
> --
> 2.43.0
>