linux-kernel - Re: [PATCH 1/2] PM / suspend: Add platform_suspend_target

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Date:   Thu, 6 Jul 2017 05:18:31 +0200
From:   Pavel Machek <pavel@....cz>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm <linux-pm@...r.kernel.org>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>,
        JB <jb_lescher@...madesigns.com>, Mason <slash.tmp@...e.fr>,
        Kevin Hilman <khilman@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] PM / suspend: Add platform_suspend_target_state()

Hi!

> Although this callback is optional and documented as such, it requires
> a platform_suspend_ops::begin callback to be implemented in order to
> provide an accurate suspend/resume state within the driver that
> implements this platform_suspend_ops.
> 
> An enumeration: platform_target_state is defined which currently defines
> the standard ACPI_S[1-4] states and can be extended with platform
> specific suspend states.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  include/linux/suspend.h | 25 +++++++++++++++++++++++++
>  kernel/power/suspend.c  | 15 +++++++++++++++
>  2 files changed, 40 insertions(+)
> 
> diff --git a/include/linux/suspend.h b/include/linux/suspend.h
> index 0b1cf32edfd7..6e6cc0778816 100644
> --- a/include/linux/suspend.h
> +++ b/include/linux/suspend.h
> @@ -50,6 +50,16 @@ enum suspend_stat_step {
>  	SUSPEND_RESUME
>  };
>  
> +enum platform_target_state {
> +	PLATFORM_STATE_UNKNOWN = -1,
> +	PLATFORM_STATE_WORKING = 0,
> +	PLATFORM_STATE_ACPI_S1,
> +	PLATFORM_STATE_ACPI_S2,
> +	PLATFORM_STATE_ACPI_S3,
> +	PLATFORM_STATE_ACPI_S4,
> +	/* Add platform specific states here */
> +};
> +

As I tried to explain in the email thread, having list with all the possible platform
states is no-go. We have about 1000 platforms supported...

NAK.
									Pavel