linux-kernel - Re: [PATCH 8/8] drm/arm/malidp: Added the late system pm functions

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Message-ID: <20180327095907.GA18146@arm.com>
Date:   Tue, 27 Mar 2018 10:59:07 +0100
From:   Ayan Halder <ayan.halder@....com>
To:     liviu.dudau@....com, brian.starkey@....com, malidp@...s.arm.com,
        airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, nd@....com
Subject: Re: [PATCH 8/8] drm/arm/malidp: Added the late system pm functions

On Tue, Mar 27, 2018 at 10:29:03AM +0200, Daniel Vetter wrote:
> On Mon, Mar 26, 2018 at 06:03:20PM +0100, Ayan Kumar Halder wrote:
> > malidp_pm_suspend_late checks if the runtime status is not suspended
> > and if so, invokes malidp_runtime_pm_suspend which disables the
> > display engine/core interrupts and the clocks. It sets the runtime status
> > as suspended. Subsequently, malidp_pm_resume_early will invoke
> > malidp_runtime_pm_resume which enables the clocks and the interrupts
> > (previously disabled) and sets the runtime status as active.
> >
> > Signed-off-by: Ayan Kumar Halder <ayan.halder@....com>
> > Change-Id: I5f8c3d28f076314a1c9da2a46760a9c37039ccda
>
> Why exactly do you need late/early hooks? If you have dependencies with
> other devices, pls consider adding device_links instead. This here
> shouldn't be necessary.
> -Daniel
We need to late/early hooks to disable malidp interrupts and the
clocks.
> > ---
> >  drivers/gpu/drm/arm/malidp_drv.c | 17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> > index bd44a6d..f6124d8 100644
> > --- a/drivers/gpu/drm/arm/malidp_drv.c
> > +++ b/drivers/gpu/drm/arm/malidp_drv.c
> > @@ -766,8 +766,25 @@ static int __maybe_unused malidp_pm_resume(struct device *dev)
> >     return 0;
> >  }
> >
> > +static int __maybe_unused malidp_pm_suspend_late(struct device *dev)
> > +{
> > +   if (!pm_runtime_status_suspended(dev)) {
> > +           malidp_runtime_pm_suspend(dev);
> > +           pm_runtime_set_suspended(dev);
> > +   }
> > +   return 0;
> > +}
> > +
> > +static int __maybe_unused malidp_pm_resume_early(struct device *dev)
> > +{
> > +   malidp_runtime_pm_resume(dev);
> > +   pm_runtime_set_active(dev);
> > +   return 0;
> > +}
> > +
> >  static const struct dev_pm_ops malidp_pm_ops = {
> >     SET_SYSTEM_SLEEP_PM_OPS(malidp_pm_suspend, malidp_pm_resume) \
> > +   SET_LATE_SYSTEM_SLEEP_PM_OPS(malidp_pm_suspend_late, malidp_pm_resume_early) \
> >     SET_RUNTIME_PM_OPS(malidp_runtime_pm_suspend, malidp_runtime_pm_resume, NULL)
> >  };
> >
> > --
> > 2.7.4
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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