linux-kernel - [PATCH 2/2] clk: qcom: gpucc-sm6375: Enable runtime pm

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Date:   Mon, 29 May 2023 15:14:24 +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>,
        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,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 2/2] clk: qcom: gpucc-sm6375: Enable runtime pm

The GPUCC block on SM6375 is powered by VDD_CX and VDD_GX. If the latter
rail is not online, GX_GDSC will never turn on. Enable runtime pm so that
we can reference VDD_GX from the dt to ensure that.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/gpucc-sm6375.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/gpucc-sm6375.c b/drivers/clk/qcom/gpucc-sm6375.c
index d3620344a009..2d863dc3d83b 100644
--- a/drivers/clk/qcom/gpucc-sm6375.c
+++ b/drivers/clk/qcom/gpucc-sm6375.c
@@ -7,6 +7,7 @@
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,sm6375-gpucc.h>
@@ -434,15 +435,29 @@ MODULE_DEVICE_TABLE(of, gpucc_sm6375_match_table);
 static int gpucc_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, &gpucc_sm6375_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	clk_lucid_pll_configure(&gpucc_pll0, regmap, &gpucc_pll0_config);
 	clk_lucid_pll_configure(&gpucc_pll1, regmap, &gpucc_pll1_config);
 
-	return qcom_cc_really_probe(pdev, &gpucc_sm6375_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &gpucc_sm6375_desc, regmap);
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static struct platform_driver gpucc_sm6375_driver = {

-- 
2.40.1