[PATCH] usb: cdns3: imx: Rework system PM to avoid duplicated operations

[Shenwei Wang]

The current implementation uses the same callbacks for system PM and
runtime PM suspend/resume without any state checking. This can cause the
clocks to be prepared/unprepared twice, leading to kernel warning issues.

This patch resolves the double prepare/unprepare issues by separating the
runtime PM and system PM handling.

Signed-off-by: Shenwei Wang <shenwei.wang at nxp.com>
Reviewed-by: Frank Li <frank.li at nxp.com>
---
 drivers/usb/cdns3/cdns3-imx.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/cdns3/cdns3-imx.c b/drivers/usb/cdns3/cdns3-imx.c
index 59860d1753fd..1c6bc6036c15 100644
--- a/drivers/usb/cdns3/cdns3-imx.c
+++ b/drivers/usb/cdns3/cdns3-imx.c
@@ -375,14 +375,22 @@ static inline bool cdns_imx_is_power_lost(struct cdns_imx *data)
 		return false;
 }
 
+static int __maybe_unused cdns_imx_system_suspend(struct device *dev)
+{
+	pm_runtime_put_sync(dev);
+	return 0;
+}
+
 static int __maybe_unused cdns_imx_system_resume(struct device *dev)
 {
 	struct cdns_imx *data = dev_get_drvdata(dev);
 	int ret;
 
-	ret = cdns_imx_resume(dev);
-	if (ret)
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Could not get runtime PM.\n");
 		return ret;
+	}
 
 	if (cdns_imx_is_power_lost(data)) {
 		dev_dbg(dev, "resume from power lost\n");
@@ -405,7 +413,7 @@ static int cdns_imx_platform_suspend(struct device *dev,
 
 static const struct dev_pm_ops cdns_imx_pm_ops = {
 	SET_RUNTIME_PM_OPS(cdns_imx_suspend, cdns_imx_resume, NULL)
-	SET_SYSTEM_SLEEP_PM_OPS(cdns_imx_suspend, cdns_imx_system_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(cdns_imx_system_suspend, cdns_imx_system_resume)
 };
 
 static const struct of_device_id cdns_imx_of_match[] = {
-- 
2.34.1