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From:   Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
To:     <agross@kernel.org>, <andersson@kernel.org>, <lgirdwood@gmail.com>,
        <broonie@kernel.org>, <robh+dt@kernel.org>,
        <quic_plai@quicinc.com>, <bgoswami@quicinc.com>, <perex@perex.cz>,
        <tiwai@suse.com>, <srinivas.kandagatla@linaro.org>,
        <quic_rohkumar@quicinc.com>, <linux-arm-msm@vger.kernel.org>,
        <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
        <swboyd@chromium.org>, <judyhsiao@chromium.org>,
        <devicetree@vger.kernel.org>
CC:     Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Subject: [PATCH v2] ASoC: qcom: lpass-sc7280: Add system suspend/resume PM ops
Date:   Tue, 29 Nov 2022 17:50:11 +0530
Message-ID: <1669724411-14840-1-git-send-email-quic_srivasam@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Update lpass sc7280 platform driver with PM ops, such as
system supend and resume callbacks.
This update is required to disable clocks during supend and
avoid XO shutdown issue.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Tested-by: Rahul Ajmeriya <quic_rajmeriy@quicinc.com>
---
Changes since v1:
    -- Add __maybe_unused flag for suspend/resume APIs.

 sound/soc/qcom/lpass-sc7280.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sound/soc/qcom/lpass-sc7280.c b/sound/soc/qcom/lpass-sc7280.c
index 70c4df8..d43f480 100644
--- a/sound/soc/qcom/lpass-sc7280.c
+++ b/sound/soc/qcom/lpass-sc7280.c
@@ -232,10 +232,28 @@ static int sc7280_lpass_exit(struct platform_device *pdev)
 	struct lpass_data *drvdata = platform_get_drvdata(pdev);
 
 	clk_bulk_disable_unprepare(drvdata->num_clks, drvdata->clks);
+	return 0;
+}
+
+static int __maybe_unused sc7280_lpass_dev_resume(struct device *dev)
+{
+	struct lpass_data *drvdata = dev_get_drvdata(dev);
+
+	return clk_bulk_prepare_enable(drvdata->num_clks, drvdata->clks);
+}
 
+static int __maybe_unused sc7280_lpass_dev_suspend(struct device *dev)
+{
+	struct lpass_data *drvdata = dev_get_drvdata(dev);
+
+	clk_bulk_disable_unprepare(drvdata->num_clks, drvdata->clks);
 	return 0;
 }
 
+static const struct dev_pm_ops sc7280_lpass_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sc7280_lpass_dev_suspend, sc7280_lpass_dev_resume)
+};
+
 static struct lpass_variant sc7280_data = {
 	.i2sctrl_reg_base		= 0x1000,
 	.i2sctrl_reg_stride		= 0x1000,
@@ -426,6 +444,7 @@ static struct platform_driver sc7280_lpass_cpu_platform_driver = {
 	.driver = {
 		.name = "sc7280-lpass-cpu",
 		.of_match_table = of_match_ptr(sc7280_lpass_cpu_device_id),
+		.pm = &sc7280_lpass_pm_ops,
 	},
 	.probe = asoc_qcom_lpass_cpu_platform_probe,
 	.remove = asoc_qcom_lpass_cpu_platform_remove,
-- 
2.7.4