[v5] iio: rzg2l_adc: Cleanups for rzg2l_adc driver

[PATCH v5 1/2] iio: adc: rzg2l: Cleanup suspend/resume path

Posted by Claudiu 6 months ago

From: Claudiu Beznea <claudiu.beznea.uj@bp.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@linaro.org>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v5:
- none

Changes in v4:
- collected tags

Changes in v3:
- collected tags

Changes in v2:
- none

 drivers/iio/adc/rzg2l_adc.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
index 9674d48074c9..0cb5a67fd497 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;
 };
 
 /**
@@ -541,14 +540,9 @@ 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)
@@ -557,9 +551,7 @@ 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;
 }
 
@@ -577,11 +569,9 @@ 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)
@@ -590,10 +580,7 @@ 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

Re: [PATCH v5 1/2] iio: adc: rzg2l: Cleanup suspend/resume path

Posted by Jonathan Cameron 5 months, 3 weeks ago

On Sun, 10 Aug 2025 15:33:27 +0300
Claudiu <claudiu.beznea@tuxon.dev> wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@bp.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")
That SHA isn't upstream. I think it should be.
563cf94f9329

With that fixes up, applied these to the fixes-togreg branch of iio.git and
marked them for stable.

> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> ---
> 
> Changes in v5:
> - none
> 
> Changes in v4:
> - collected tags
> 
> Changes in v3:
> - collected tags
> 
> Changes in v2:
> - none
> 
>  drivers/iio/adc/rzg2l_adc.c | 29 ++++++++---------------------
>  1 file changed, 8 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
> index 9674d48074c9..0cb5a67fd497 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;
>  };
>  
>  /**
> @@ -541,14 +540,9 @@ 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)
> @@ -557,9 +551,7 @@ 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;
>  }
>  
> @@ -577,11 +569,9 @@ 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)
> @@ -590,10 +580,7 @@ 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;

Re: [PATCH v5 1/2] iio: adc: rzg2l: Cleanup suspend/resume path

Posted by Claudiu Beznea 5 months, 3 weeks ago


On 16.08.2025 16:53, Jonathan Cameron wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@bp.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")
> That SHA isn't upstream. I think it should be.
> 563cf94f9329

You're right! Thank you for handling it.