linux-kernel - [PATCH 1/2] clk: qcom: gpucc-sc8280xp: Add runtime PM

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Date:   Mon, 19 Jun 2023 18:13:17 +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 1/2] clk: qcom: gpucc-sc8280xp: Add runtime PM

The GPU_CC block on SC8280XP is powered by the GFX 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/gpucc-sc8280xp.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/gpucc-sc8280xp.c b/drivers/clk/qcom/gpucc-sc8280xp.c
index ea1e9505c335..8e147ee294ee 100644
--- a/drivers/clk/qcom/gpucc-sc8280xp.c
+++ b/drivers/clk/qcom/gpucc-sc8280xp.c
@@ -7,6 +7,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,gpucc-sc8280xp.h>
@@ -424,10 +425,21 @@ static struct qcom_cc_desc gpu_cc_sc8280xp_desc = {
 static int gpu_cc_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, &gpu_cc_sc8280xp_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	clk_lucid_pll_configure(&gpu_cc_pll0, regmap, &gpu_cc_pll0_config);
 	clk_lucid_pll_configure(&gpu_cc_pll1, regmap, &gpu_cc_pll1_config);
@@ -439,7 +451,10 @@ static int gpu_cc_sc8280xp_probe(struct platform_device *pdev)
 	regmap_update_bits(regmap, 0x1170, BIT(0), BIT(0));
 	regmap_update_bits(regmap, 0x109c, BIT(0), BIT(0));
 
-	return qcom_cc_really_probe(pdev, &gpu_cc_sc8280xp_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &gpu_cc_sc8280xp_desc, regmap);
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static const struct of_device_id gpu_cc_sc8280xp_match_table[] = {

-- 
2.41.0