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

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Date:   Fri, 9 Jul 2021 17:40:35 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     xiongxin <win239@....com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        xiongxin <xiongxin@...inos.cn>
Subject: Re: [PATCH] PM / s2idle: Fix the failure of specifying
 "mem_sleep_default=" parameter

On Fri, Jul 9, 2021 at 3:03 AM xiongxin <win239@....com> wrote:
>
> From: xiongxin <xiongxin@...inos.cn>
>
> 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>

It's the third submission of the same patch AFAICS.

Have you made any changes to it since the previous submissions?  If
not, it is not necessary (or even useful) to resend it.

>
> 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
>