linux-kernel - Re: [PATCH 3/4] PM / core: Direct DPM_FLAG_SMART

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Date:   Tue, 19 Dec 2017 12:19:20 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Kevin Hilman <khilman@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH 3/4] PM / core: Direct DPM_FLAG_SMART_SUSPEND optimization

On Tue, Dec 19, 2017 at 12:13 PM, Rafael J. Wysocki <rafael@...nel.org> wrote:
> On Tue, Dec 19, 2017 at 8:38 AM, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>> On 10 December 2017 at 01:00, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>>

[cut]

>
>> Moreover, what happens when/if a driver that has deployed this
>> solution, starts being used on a new SoC and then additional
>> operations during system suspend becomes required (for example
>> pinctrls that needs to be put in a system sleep state)? Then
>> everything falls apart, doesn't it?
>
> Then you runtime-resume the device in ->suspend() and the remaining
> callbacks will run for you just fine.

BTW, I guess you'll need a middle layer in that case anyway so that
the driver doesn't have to distinguish between platforms it has to
work with which makes the argument somewhat moot.

Thanks,
Rafael