linux-kernel - Re: [PATCH 01/10] i2c: add suspended flag and accessors for i2c adapters

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Date:   Thu, 20 Dec 2018 22:09:37 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>, Lukas Wunner <lukas@...ner.de>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] i2c: add suspended flag and accessors for i2c adapters

On Thursday, December 20, 2018 11:00:29 AM CET Hans de Goede wrote:
> Hi,
> 
> On 19-12-18 23:33, Wolfram Sang wrote:
> > Hi Lukas, Hans,
> > 
> > On Wed, Dec 19, 2018 at 07:36:54PM +0100, Hans de Goede wrote:
> >> Hi,
> >>
> >> On 19-12-18 18:22, Lukas Wunner wrote:
> >>> On Wed, Dec 19, 2018 at 05:48:17PM +0100, Wolfram Sang wrote:
> >>>> +static inline void i2c_mark_adapter_suspended(struct i2c_adapter *adap)
> >>>> +{
> >>>> +	i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
> >>>> +	set_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
> >>>> +	i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
> >>>> +}
> >>>
> >>> This looks like a duplication of the is_suspended flag in struct dev_pm_info.
> >>> Any reason why you can't use that?  If so, it would be good to document the
> >>> reason in the commit message.
> >>
> >> Oh, that is a very good point and that one only gets set on system suspend
> >> and not on resume suspend, working around the problems with the i2c-designware
> > 
> > Just to make it clear: you mean runtime suspend, not resume suspend, or?
> 
> Yes I mean runtime-suspend, sorry.

The power.is_suspended flag is about system-wide suspend, however.