linux-kernel - [PATCH v2 04/15] clk: qcom: gcc-sm6375: Add runtime PM

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Message-Id: <20230717-topic-branch_aon_cleanup-v2-4-2a583460ef26@linaro.org>
Date:   Wed, 29 Nov 2023 19:59:23 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...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, devicetree@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v2 04/15] clk: qcom: gcc-sm6375: Add runtime PM

The GCC block on SM6375 is powered by the VDD_CX rail. We need to ensure
that CX is enabled to prevent unwanted power collapse and that the
reference is dropped when unused so that the system can enter a
firmware-managed lower power state.

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

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/gcc-sm6375.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/gcc-sm6375.c b/drivers/clk/qcom/gcc-sm6375.c
index 7d55e10373ef..86ed8c255c94 100644
--- a/drivers/clk/qcom/gcc-sm6375.c
+++ b/drivers/clk/qcom/gcc-sm6375.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,sm6375-gcc.h>
@@ -3785,13 +3786,25 @@ static int gcc_sm6375_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_sm6375_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	ret = qcom_cc_register_rcg_dfs(regmap, gcc_dfs_clocks, ARRAY_SIZE(gcc_dfs_clocks));
-	if (ret)
+	if (ret) {
+		pm_runtime_put(&pdev->dev);
 		return ret;
+	}
 
 	qcom_branch_set_clk_en(regmap, 0x17028); /* GCC_CAMERA_XO_CLK */
 	qcom_branch_set_clk_en(regmap, 0x2b004); /* GCC_CPUSS_GNOC_CLK */
@@ -3807,7 +3820,10 @@ static int gcc_sm6375_probe(struct platform_device *pdev)
 	clk_lucid_pll_configure(&gpll8, regmap, &gpll8_config);
 	clk_zonda_pll_configure(&gpll9, regmap, &gpll9_config);
 
-	return qcom_cc_really_probe(pdev, &gcc_sm6375_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &gcc_sm6375_desc, regmap);
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static struct platform_driver gcc_sm6375_driver = {

-- 
2.43.0