linux-kernel - [PATCH] PM / s2idle: Fix the failure of specifying "mem_sleep

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Message-Id: <20210704054954.9349-1-xiongxin@kylinos.cn>
Date:   Sun,  4 Jul 2021 13:49:54 +0800
From:   xiongxin <xiongxin@...inos.cn>
To:     len.brown@...el.com
Cc:     rjw@...ysocki.net, pavel@....cz, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, xiongxin <xiongxin@...inos.cn>
Subject: [PATCH] PM / s2idle: Fix the failure of specifying "mem_sleep_default=" parameter

On the arm64 platform, the psci driver is used by default to set the
suspend_ops structure; but the psci_acpi_init() function is called
before the command-line parameter "mem_sleep_default=" is specified;
the user cannot set the desired suspend mode through the
"mem_sleep_default=" parameter;

In mem_sleep_default_setup(), judge whether suspend_ops is set, if it
has been assigned, rewrite the value of mem_sleep_current variable; in
order to complete the user setting;

Signed-off-by: xiongxin <xiongxin@...inos.cn>

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index d8cae434f9eb..bef4b17de3f6 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -192,6 +192,21 @@ static int __init mem_sleep_default_setup(char *str)
 			break;
 		}
 
+	/*
+	 * When the suspend_ops has been set, "mem_sleep_default=*" will
+	 * be invalid, here to fix this situation.
+	 */
+	if (suspend_ops) {
+		if (mem_sleep_default == PM_SUSPEND_TO_IDLE)
+			mem_sleep_current = PM_SUSPEND_TO_IDLE;
+		else if ((mem_sleep_default == PM_SUSPEND_STANDBY) &&
+				valid_state(PM_SUSPEND_STANDBY))
+			mem_sleep_current = PM_SUSPEND_STANDBY;
+		else if ((mem_sleep_default >= PM_SUSPEND_MEM) &&
+				valid_state(PM_SUSPEND_MEM))
+			mem_sleep_current = PM_SUSPEND_MEM;
+	}
+
 	return 1;
 }
 __setup("mem_sleep_default=", mem_sleep_default_setup);
-- 
2.25.1