[PATCH RFC 6/6] drivers: soc: system_pm: Add suspend notifier

[Raju P.L.S.S.S.N]

The order of suspending different devices, which is part of device
suspend, during pm suspend can't be guaranteed. So once system PM device
flushes the cached sleep/wake requests, other client devices may send
new sleep or wake requests in their device suspend operations. The rpmh
controller needs to manage such new requests if any. A notification is
sent to controller to indicate the same.

Signed-off-by: Raju P.L.S.S.S.N <rplsssn@xxxxxxxxxxxxxx>
---
 drivers/soc/qcom/system_pm.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/system_pm.c b/drivers/soc/qcom/system_pm.c
index 1451bf8..6524f7e 100644
--- a/drivers/soc/qcom/system_pm.c
+++ b/drivers/soc/qcom/system_pm.c
@@ -133,6 +133,7 @@ static int sys_pm_suspend(struct device *dev)
 		/* Flush the sleep/wake sets in RSC controller */
 		rpmh_flush(dev);
 		setup_pdc_wakeup_timer(true);
+		rpmh_notify_suspend(sys_pm_dev, true);
 	} else {
 		pr_err("%s:rpmh controller is busy\n", __func__);
 		return -EBUSY;
@@ -141,8 +142,14 @@ static int sys_pm_suspend(struct device *dev)
 	return 0;
 }
 
+static int sys_pm_resume(struct device *dev)
+{
+	rpmh_notify_suspend(sys_pm_dev, false);
+	return 0;
+}
+
 static const struct dev_pm_ops sys_pm_dev_pm_ops = {
-	SET_LATE_SYSTEM_SLEEP_PM_OPS(sys_pm_suspend, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(sys_pm_suspend, sys_pm_resume)
 };
 
 static const struct of_device_id sys_pm_drv_match[] = {
-- 
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