linux-kernel - [PATCH v2] PM: suspend: Set mem_sleep_current during kernel command line setup

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Date: Thu, 29 Feb 2024 12:14:59 +0530
From: Maulik Shah <quic_mkshah@...cinc.com>
To: Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi
	<lpieralisi@...nel.org>, <andersson@...nel.org>,
        <ulf.hansson@...aro.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Sudeep Holla <Sudeep.Holla@....com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <quic_lsrao@...cinc.com>, <stable@...r.kernel.org>,
        Maulik Shah
	<quic_mkshah@...cinc.com>
Subject: [PATCH v2] PM: suspend: Set mem_sleep_current during kernel
 command line setup

psci_init_system_suspend() invokes suspend_set_ops() very early during
bootup even before kernel command line for mem_sleep_default is setup.
This leads to kernel command line mem_sleep_default=s2idle not working
as mem_sleep_current gets changed to deep via suspend_set_ops() and never
changes back to s2idle.

Set mem_sleep_current along with mem_sleep_default during kernel command
line setup as default suspend mode.

Fixes: faf7ec4a92c0 ("drivers: firmware: psci: add system suspend support")
CC: stable@...r.kernel.org # 5.4+
Signed-off-by: Maulik Shah <quic_mkshah@...cinc.com>
---
Changes in v2:
- Set mem_sleep_current during mem_sleep_default kernel command line setup
- Update commit message accordingly
- Retain Fixes: tag
- Link to v1: https://lore.kernel.org/r/20240219-suspend_ops_late_init-v1-1-6330ca9597fa@quicinc.com
---
 kernel/power/suspend.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 742eb26618cc..e3ae93bbcb9b 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -192,6 +192,7 @@ static int __init mem_sleep_default_setup(char *str)
 		if (mem_sleep_labels[state] &&
 		    !strcmp(str, mem_sleep_labels[state])) {
 			mem_sleep_default = state;
+			mem_sleep_current = state;
 			break;
 		}
 

---
base-commit: d37e1e4c52bc60578969f391fb81f947c3e83118
change-id: 20240219-suspend_ops_late_init-27fb0b15baee

Best regards,
-- 
Maulik Shah <quic_mkshah@...cinc.com>