[PATCH] gpu/drm/msm: fix shutdown hook in case GPU components failed to bind

[Rob Clark]

On Fri, Mar 19, 2021 at 5:09 AM Fabio Estevam <festevam at gmail.com> wrote:
>
> Hi Dmitry,
>
> On Mon, Mar 1, 2021 at 6:41 PM Dmitry Baryshkov
> <dmitry.baryshkov at linaro.org> wrote:
>
> > diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
> > index 6a326761dc4a..2fd0cf6421ad 100644
> > --- a/drivers/gpu/drm/msm/msm_atomic.c
> > +++ b/drivers/gpu/drm/msm/msm_atomic.c
> > @@ -207,7 +207,12 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
> >         struct msm_kms *kms = priv->kms;
> >         struct drm_crtc *async_crtc = NULL;
> >         unsigned crtc_mask = get_crtc_mask(state);
> > -       bool async = kms->funcs->vsync_time &&
> > +       bool async;
> > +
> > +       if (!kms)
> > +               return;
> > +
> > +       async = kms->funcs->vsync_time &&
> >                         can_do_async(state, &async_crtc);
>
> I also see the same issue on a i.MX53:
> https://lists.freedesktop.org/archives/freedreno/2021-January/009369.html
>
> Then I got a different suggestion from Rob. Please check:
>
> https://www.spinics.net/lists/dri-devel/msg286648.html
> and
> https://www.spinics.net/lists/dri-devel/msg286649.html
>
> Does this series fix the issue in your platform too?

I think that might not help if something fails to probe due to (for
example) a missing dependency, so !priv->kms is probably a better
check to cover both cases.  But the 2nd patch makes a good point, that
the suspend/resume path probably needs the same treatment

BR,
-R