linux-kernel - [PATCH 2/2] clk: qcom: gcc-sc8280xp: Add runtime PM

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Date:   Mon, 19 Jun 2023 18:13:18 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 2/2] clk: qcom: gcc-sc8280xp: Add runtime PM

The GCC block on SC8280XP is powered by the CX rail. We need to ensure
that it's enabled to prevent unwanted power collapse.

Enable runtime PM to keep the power flowing only when necessary.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/gcc-sc8280xp.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/gcc-sc8280xp.c b/drivers/clk/qcom/gcc-sc8280xp.c
index 04a99dbaa57e..b90c71637814 100644
--- a/drivers/clk/qcom/gcc-sc8280xp.c
+++ b/drivers/clk/qcom/gcc-sc8280xp.c
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/regmap.h>
 
@@ -7421,9 +7422,19 @@ static int gcc_sc8280xp_probe(struct platform_device *pdev)
 	struct regmap *regmap;
 	int ret;
 
+	ret = devm_pm_runtime_enable(&pdev->dev);
+	if (ret)
+		return ret;
+
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret)
+		return ret;
+
 	regmap = qcom_cc_map(pdev, &gcc_sc8280xp_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	/*
 	 * Keep the clocks always-ON
@@ -7445,7 +7456,10 @@ static int gcc_sc8280xp_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return qcom_cc_really_probe(pdev, &gcc_sc8280xp_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &gcc_sc8280xp_desc, regmap);
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static const struct of_device_id gcc_sc8280xp_match_table[] = {

-- 
2.41.0