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Subject[PATCH RFC 6/6] drivers: soc: system_pm: Add suspend notifier
Date
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@codeaurora.org>
---
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[] = {
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation.
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