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References: <20191206075321.18239-1-hslester96@gmail.com> <8736dq2c66.fsf@intel.com>
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From:   Ben Skeggs <skeggsb@gmail.com>
Date:   Fri, 13 Dec 2019 09:39:16 +1000
Message-ID: <CACAvsv4He=bKpa2VxJr-cYUoy66sw8mGgFcnpMM0qDb1qXYSrg@mail.gmail.com>
Subject: Re: [PATCH] drm/dp_mst: add missed nv50_outp_release in nv50_msto_disable
To:     Jani Nikula <jani.nikula@linux.intel.com>
Cc:     Chuhong Yuan <hslester96@gmail.com>,
        David Airlie <airlied@linux.ie>,
        ML nouveau <nouveau@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        ML dri-devel <dri-devel@lists.freedesktop.org>,
        Ben Skeggs <bskeggs@redhat.com>
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On Thu, 12 Dec 2019 at 18:14, Jani Nikula <jani.nikula@linux.intel.com> wrote:
>
> On Fri, 06 Dec 2019, Chuhong Yuan <hslester96@gmail.com> wrote:
> > nv50_msto_disable() does not call nv50_outp_release() to match
> > nv50_outp_acquire() like other disable().
> > Add the missed call to fix it.
This is intentional, and it's called at a later time
(nv50_mstm_prepare()) to avoid confusing HW.

Ben.

>
> The subject prefix "drm/dp_mst" implies drm core change, but this is
> about nouveau. Please fix.
>
> BR,
> Jani.
>
> >
> > Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
> > ---
> >  drivers/gpu/drm/nouveau/dispnv50/disp.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > index 549486f1d937..84e1417355cc 100644
> > --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > @@ -862,8 +862,10 @@ nv50_msto_disable(struct drm_encoder *encoder)
> >
> >       mstm->outp->update(mstm->outp, msto->head->base.index, NULL, 0, 0);
> >       mstm->modified = true;
> > -     if (!--mstm->links)
> > +     if (!--mstm->links) {
> >               mstm->disabled = true;
> > +             nv50_outp_release(mstm->outp);
> > +     }
> >       msto->disabled = true;
> >  }
>
> --
> Jani Nikula, Intel Open Source Graphics Center
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