linux-kernel - [PATCH v2 08/15] iio: adc: rzg2l_adc: Enable runtime PM autosuspend support

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Message-Id: <20241206111337.726244-9-claudiu.beznea.uj@bp.renesas.com>
Date: Fri,  6 Dec 2024 13:13:30 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: prabhakar.mahadev-lad.rj@...renesas.com,
	jic23@...nel.org,
	lars@...afoo.de,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	p.zabel@...gutronix.de
Cc: claudiu.beznea@...on.dev,
	linux-iio@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v2 08/15] iio: adc: rzg2l_adc: Enable runtime PM autosuspend support

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

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.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v2:
- used a non-zero default autosusped delay
- adjusted the patch description to reflect that the default autosuspend
  delay has been changed

 drivers/iio/adc/rzg2l_adc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
index 953511191eac..c3f9f95cdbba 100644
--- a/drivers/iio/adc/rzg2l_adc.c
+++ b/drivers/iio/adc/rzg2l_adc.c
@@ -208,7 +208,8 @@ 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;
 }
 
@@ -410,6 +412,8 @@ static int rzg2l_adc_probe(struct platform_device *pdev)
 				     "failed to get/deassert presetn\n");
 	}
 
+	pm_runtime_set_autosuspend_delay(dev, 300);
+	pm_runtime_use_autosuspend(dev);
 	ret = devm_pm_runtime_enable(dev);
 	if (ret)
 		return ret;
-- 
2.39.2