iio: adc: rzg2l: Cleanup suspend/resume path

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: 563cf94 ("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>
Link: https://patch.msgid.link/20250810123328.800104-2-claudiu.beznea.uj@bp.renesas.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: claudiubeznea

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;