From db3c4e366287cc2ed7b15e74a85bc5a12f5be4b8 Mon Sep 17 00:00:00 2001 From: Shenwei Wang Date: Tue, 23 May 2023 13:44:12 -0500 Subject: usb: cdns3: imx: Rework system PM to avoid duplicated operations 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 Reviewed-by: Frank Li Link: https://lore.kernel.org/r/20230523184412.204582-1-shenwei.wang@nxp.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/cdns3/cdns3-imx.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'drivers/usb/cdns3/cdns3-imx.c') diff --git a/drivers/usb/cdns3/cdns3-imx.c b/drivers/usb/cdns3/cdns3-imx.c index 31c39728156f..281de47e2a3b 100644 --- a/drivers/usb/cdns3/cdns3-imx.c +++ b/drivers/usb/cdns3/cdns3-imx.c @@ -373,14 +373,22 @@ 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"); @@ -403,7 +411,7 @@ 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[] = { -- cgit v1.2.3