[PATCH] ASoC: qcom: lpass-sc7180: Add system suspend/resume PM ops

[Srinivasa Rao Mandadapu]

Update lpass sc7180 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 at quicinc.com>
Tested-by: Rahul Ajmeriya <quic_rajmeriy at quicinc.com>
---
 sound/soc/qcom/lpass-sc7180.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/sound/soc/qcom/lpass-sc7180.c b/sound/soc/qcom/lpass-sc7180.c
index 77a556b..6ad1c5b 100644
--- a/sound/soc/qcom/lpass-sc7180.c
+++ b/sound/soc/qcom/lpass-sc7180.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <dt-bindings/sound/sc7180-lpass.h>
 #include <sound/pcm.h>
 #include <sound/soc.h>
@@ -156,10 +157,34 @@ static int sc7180_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 sc7180_lpass_dev_resume(struct device *dev)
+{
+	int ret = 0;
+	struct lpass_data *drvdata = dev_get_drvdata(dev);
 
+	ret = clk_bulk_prepare_enable(drvdata->num_clks, drvdata->clks);
+	if (ret) {
+		dev_err(dev, "sc7180 clk prepare and enable failed\n");
+		return ret;
+	}
+	return ret;
+}
+
+static int sc7180_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 sc7180_lpass_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sc7180_lpass_dev_suspend, sc7180_lpass_dev_resume)
+};
+
 static struct lpass_variant sc7180_data = {
 	.i2sctrl_reg_base	= 0x1000,
 	.i2sctrl_reg_stride	= 0x1000,
@@ -293,6 +318,7 @@ static struct platform_driver sc7180_lpass_cpu_platform_driver = {
 	.driver = {
 		.name = "sc7180-lpass-cpu",
 		.of_match_table = of_match_ptr(sc7180_lpass_cpu_device_id),
+		.pm = &sc7180_lpass_pm_ops,
 	},
 	.probe = asoc_qcom_lpass_cpu_platform_probe,
 	.remove = asoc_qcom_lpass_cpu_platform_remove,
-- 
2.7.4