linux-kernel - Re: [PATCH v3 2/2] iio: adc: rzg2l: Cleanup suspend/resume path

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Message-ID: <CA+V-a8uF+y-SuVNs=iBpgitnGgDzVGzc9YK8KBnxfVHtp+swUw@mail.gmail.com>
Date: Tue, 25 Feb 2025 20:36:50 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: prabhakar.mahadev-lad.rj@...renesas.com, jic23@...nel.org, lars@...afoo.de, 
	linux-iio@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>, Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v3 2/2] iio: adc: rzg2l: Cleanup suspend/resume path

On Mon, Feb 24, 2025 at 12:13 PM Claudiu <claudiu.beznea@...on.dev> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> There is no need to manually track the runtime PM status in the driver.
> The pm_runtime_force_suspend() and pm_runtime_force_resume() functions
> already call pm_runtime_status_suspended() to check the runtime PM state.
>
> Additionally, avoid calling pm_runtime_put_autosuspend() during the
> suspend/resume path, as this would decrease the usage counter of a
> potential user that had the ADC open before the suspend/resume cycle.
>
> Fixes: cb164d7c1526 ("iio: adc: rzg2l_adc: Add suspend/resume support")
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>
> Changes in v3:
> - collected tags
>
> Changes in v2:
> - none
>
>  drivers/iio/adc/rzg2l_adc.c | 29 ++++++++---------------------
>  1 file changed, 8 insertions(+), 21 deletions(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
> index 7db04416e1cf..5236ca0da167 100644
> --- a/drivers/iio/adc/rzg2l_adc.c
> +++ b/drivers/iio/adc/rzg2l_adc.c
> @@ -89,7 +89,6 @@ struct rzg2l_adc {
>         struct completion completion;
>         struct mutex lock;
>         u16 last_val[RZG2L_ADC_MAX_CHANNELS];
> -       bool was_rpm_active;
>  };
>
>  /**
> @@ -594,14 +593,9 @@ static int rzg2l_adc_suspend(struct device *dev)
>         };
>         int ret;
>
> -       if (pm_runtime_suspended(dev)) {
> -               adc->was_rpm_active = false;
> -       } else {
> -               ret = pm_runtime_force_suspend(dev);
> -               if (ret)
> -                       return ret;
> -               adc->was_rpm_active = true;
> -       }
> +       ret = pm_runtime_force_suspend(dev);
> +       if (ret)
> +               return ret;
>
>         ret = reset_control_bulk_assert(ARRAY_SIZE(resets), resets);
>         if (ret)
> @@ -610,9 +604,7 @@ static int rzg2l_adc_suspend(struct device *dev)
>         return 0;
>
>  rpm_restore:
> -       if (adc->was_rpm_active)
> -               pm_runtime_force_resume(dev);
> -
> +       pm_runtime_force_resume(dev);
>         return ret;
>  }
>
> @@ -630,11 +622,9 @@ static int rzg2l_adc_resume(struct device *dev)
>         if (ret)
>                 return ret;
>
> -       if (adc->was_rpm_active) {
> -               ret = pm_runtime_force_resume(dev);
> -               if (ret)
> -                       goto resets_restore;
> -       }
> +       ret = pm_runtime_force_resume(dev);
> +       if (ret)
> +               goto resets_restore;
>
>         ret = rzg2l_adc_hw_init(dev, adc);
>         if (ret)
> @@ -643,10 +633,7 @@ static int rzg2l_adc_resume(struct device *dev)
>         return 0;
>
>  rpm_restore:
> -       if (adc->was_rpm_active) {
> -               pm_runtime_mark_last_busy(dev);
> -               pm_runtime_put_autosuspend(dev);
> -       }
> +       pm_runtime_force_suspend(dev);
>  resets_restore:
>         reset_control_bulk_assert(ARRAY_SIZE(resets), resets);
>         return ret;
> --
> 2.43.0
>
>