linux-kernel - Re: [PATCH v2 04/15] ARM: milbeaut: Add basic support for Milbeaut m10v SoC

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Date:   Mon, 18 Feb 2019 13:15:22 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Sugaya Taichi <sugaya.taichi@...ionext.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shinji Kanematsu <kanematsu.shinji@...ionext.com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Takao Orito <orito.takao@...ionext.com>,
        Kazuhiro Kasai <kasai.kazuhiro@...ionext.com>
Subject: Re: [PATCH v2 04/15] ARM: milbeaut: Add basic support for Milbeaut
 m10v SoC

On Fri, Feb 8, 2019 at 1:26 PM Sugaya Taichi
<sugaya.taichi@...ionext.com> wrote:

> +static int m10v_pm_enter(suspend_state_t state)
> +{
> +       switch (state) {
> +       case PM_SUSPEND_STANDBY:
> +               pr_err("STANDBY\n");
> +               asm("wfi");
> +               break;
> +       case PM_SUSPEND_MEM:
> +               pr_err("SUSPEND\n");
> +               cpu_pm_enter();
> +               cpu_suspend(0, m10v_die);
> +               cpu_pm_exit();
> +               break;
> +       }
> +       return 0;
> +}

It looks like you left the pr_err() messages from bringup, they should probably
be removed now.

> +static int __init m10v_pm_init(void)
> +{
> +       suspend_set_ops(&m10v_pm_ops);
> +
> +       return 0;
> +}
> +late_initcall(m10v_pm_init);

This requires a check to ensure you are actually on the right platform,
otherwise you break suspend/resume in a multiplatform kernel running
on anything other than milbeaut.

       Arnd