linux-kernel - Re: [PATCH] PM: domains: log failures to register always-on domains

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Date:   Tue, 4 Oct 2022 16:27:53 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Kaehlcke <mka@...omium.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM: domains: log failures to register always-on domains

On Fri, Sep 30, 2022 at 12:39 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Thu, 29 Sept 2022 at 17:42, Johan Hovold <johan+linaro@...nel.org> wrote:
> >
> > Always-on PM domains must be on during initialisation or the domain is
> > currently silently rejected.
> >
> > Print an error message in case an always-on domain is not on to make it
> > easier to debug drivers getting this wrong (e.g. by setting an always-on
> > genpd flag without making sure that the state matches).
> >
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Applied as 6.1-rc material, thanks!

> > ---
> >  drivers/base/power/domain.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> >
> > Both myself and Matthias have hit this with the Qualcomm GCC drivers
> > when updating static genpd flags directly instead of using/adding driver
> > specific flags to propagate the setting.
> >
> > Johan
> >
> >
> > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> > index bbfbf05b3446..7200e307effb 100644
> > --- a/drivers/base/power/domain.c
> > +++ b/drivers/base/power/domain.c
> > @@ -2087,8 +2087,10 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
> >
> >         /* Always-on domains must be powered on at initialization. */
> >         if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
> > -                       !genpd_status_on(genpd))
> > +                       !genpd_status_on(genpd)) {
> > +               pr_err("always-on PM domain %s is not on\n", genpd->name);
> >                 return -EINVAL;
> > +       }
> >
> >         /* Multiple states but no governor doesn't make sense. */
> >         if (!gov && genpd->state_count > 1)
> > --
> > 2.35.1
> >