linux-kernel - [PATCH v0] clk: qcom: lpasscc: Re-configure the PLL in case lost

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Date:   Wed, 14 Oct 2020 00:03:28 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette   <mturquette@...libre.com>
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Taniya Das <tdas@...eaurora.org>
Subject: [PATCH v0] clk: qcom: lpasscc: Re-configure the PLL in case lost

In the case where the PLL configuration is lost, then the pm runtime
resume will reconfigure before usage.

Fixes: edab812d802d ("clk: qcom: lpass: Add support for LPASS clock controller for SC7180")
Signed-off-by: Taniya Das <tdas@...eaurora.org>
---
 drivers/clk/qcom/lpasscorecc-sc7180.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/clk/qcom/lpasscorecc-sc7180.c b/drivers/clk/qcom/lpasscorecc-sc7180.c
index 228d08f..5804a93 100644
--- a/drivers/clk/qcom/lpasscorecc-sc7180.c
+++ b/drivers/clk/qcom/lpasscorecc-sc7180.c
@@ -356,6 +356,25 @@ static const struct qcom_cc_desc lpass_audio_hm_sc7180_desc = {
 	.num_gdscs = ARRAY_SIZE(lpass_audio_hm_sc7180_gdscs),
 };

+static int lpass_core_cc_pm_clk_resume(struct device *dev)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+	int l_val;
+
+	pm_clk_resume(dev);
+
+	/* Read PLL_L_VAL */
+	regmap_read(regmap, 0x1004, &l_val);
+	if (!l_val)
+		clk_fabia_pll_configure(&lpass_lpaaudio_dig_pll, regmap,
+				&lpass_lpaaudio_dig_pll_config);
+	return 0;
+}
+
+static const struct dev_pm_ops lpass_core_pm_ops = {
+	SET_RUNTIME_PM_OPS(pm_clk_suspend, lpass_core_cc_pm_clk_resume, NULL)
+};
+
 static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
 {
 	const struct qcom_cc_desc *desc;
@@ -386,6 +405,9 @@ static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
 	clk_fabia_pll_configure(&lpass_lpaaudio_dig_pll, regmap,
 				&lpass_lpaaudio_dig_pll_config);

+	pdev->dev.driver->pm = &lpass_core_pm_ops;
+	dev_set_drvdata(&pdev->dev, regmap);
+
 	return qcom_cc_really_probe(pdev, &lpass_core_cc_sc7180_desc, regmap);
 }

--
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