From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> Enable runtime PM autosuspend support for the rzg2l_adc driver. With this change, consecutive conversion requests will no longer cause the device to be runtime-enabled/disabled after each request. Instead, the device will transition based on the delay configured by the user. This approach reduces the frequency of hardware register access during runtime PM suspend/resume cycles, thereby saving CPU cycles. The default autosuspend delay is set to zero to maintain the previous driver behavior. Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> --- drivers/iio/adc/rzg2l_adc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c index eed2944bd98d..fda8b42ded81 100644 --- a/drivers/iio/adc/rzg2l_adc.c +++ b/drivers/iio/adc/rzg2l_adc.c @@ -207,7 +207,8 @@ static int rzg2l_adc_conversion(struct iio_dev *indio_dev, struct rzg2l_adc *adc rzg2l_adc_start_stop(adc, false); rpm_put: - pm_runtime_put_sync(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); return ret; } @@ -372,7 +373,8 @@ static int rzg2l_adc_hw_init(struct device *dev, struct rzg2l_adc *adc) rzg2l_adc_writel(adc, RZG2L_ADM(3), reg); exit_hw_init: - pm_runtime_put_sync(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); return ret; } @@ -412,6 +414,9 @@ static int rzg2l_adc_probe(struct platform_device *pdev) return PTR_ERR(adc->presetn); } + /* Default 0 for power saving. Can be overridden via sysfs. */ + pm_runtime_set_autosuspend_delay(dev, 0); + pm_runtime_use_autosuspend(dev); ret = devm_pm_runtime_enable(dev); if (ret) return ret; -- 2.39.2
