Date:   Tue, 16 Oct 2018 21:15:13 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     Dave Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/sti: clean up after drm_atomic_helper_shutdown rework

On Tue, Oct 16, 2018 at 8:30 PM Benjamin Gaignard
<benjamin.gaignard@...aro.org> wrote:
>
> Le lun. 15 oct. 2018 à 10:00, Daniel Vetter <daniel@...ll.ch> a écrit :
> >
> > On Fri, Oct 12, 2018 at 11:46:39AM +0200, Benjamin Gaignard wrote:
> > > Since drm_atomic_helper_shutdown() rework it is possible to do additional
> > > clean up in sti driver: custom plane destroy functions become useless and
> > > clean up encoder is no more needed.
> > >
> > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> > > ---
> > >  drivers/gpu/drm/sti/sti_cursor.c |  9 +--------
> > >  drivers/gpu/drm/sti/sti_gdp.c    |  9 +--------
> > >  drivers/gpu/drm/sti/sti_hqvdp.c  |  9 +--------
> > >  drivers/gpu/drm/sti/sti_tvout.c  | 24 ------------------------
> > >  4 files changed, 3 insertions(+), 48 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/sti/sti_cursor.c b/drivers/gpu/drm/sti/sti_cursor.c
> > > index bc908453ffb3..e1ba253055c7 100644
> > > --- a/drivers/gpu/drm/sti/sti_cursor.c
> > > +++ b/drivers/gpu/drm/sti/sti_cursor.c
> > > @@ -328,13 +328,6 @@ static const struct drm_plane_helper_funcs sti_cursor_helpers_funcs = {
> > >       .atomic_disable = sti_cursor_atomic_disable,
> > >  };
> > >
> > > -static void sti_cursor_destroy(struct drm_plane *drm_plane)
> > > -{
> > > -     DRM_DEBUG_DRIVER("\n");
> > > -
> > > -     drm_plane_cleanup(drm_plane);
> > > -}
> > > -
> > >  static int sti_cursor_late_register(struct drm_plane *drm_plane)
> > >  {
> > >       struct sti_plane *plane = to_sti_plane(drm_plane);
> > > @@ -346,7 +339,7 @@ static int sti_cursor_late_register(struct drm_plane *drm_plane)
> > >  static const struct drm_plane_funcs sti_cursor_plane_helpers_funcs = {
> > >       .update_plane = drm_atomic_helper_update_plane,
> > >       .disable_plane = drm_atomic_helper_disable_plane,
> > > -     .destroy = sti_cursor_destroy,
> > > +     .destroy = drm_plane_cleanup,
> > >       .reset = sti_plane_reset,
> > >       .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > >       .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> > > diff --git a/drivers/gpu/drm/sti/sti_gdp.c b/drivers/gpu/drm/sti/sti_gdp.c
> > > index 3c19614d3f75..87b50451afd7 100644
> > > --- a/drivers/gpu/drm/sti/sti_gdp.c
> > > +++ b/drivers/gpu/drm/sti/sti_gdp.c
> > > @@ -879,13 +879,6 @@ static const struct drm_plane_helper_funcs sti_gdp_helpers_funcs = {
> > >       .atomic_disable = sti_gdp_atomic_disable,
> > >  };
> > >
> > > -static void sti_gdp_destroy(struct drm_plane *drm_plane)
> > > -{
> > > -     DRM_DEBUG_DRIVER("\n");
> > > -
> > > -     drm_plane_cleanup(drm_plane);
> > > -}
> > > -
> > >  static int sti_gdp_late_register(struct drm_plane *drm_plane)
> > >  {
> > >       struct sti_plane *plane = to_sti_plane(drm_plane);
> > > @@ -897,7 +890,7 @@ static int sti_gdp_late_register(struct drm_plane *drm_plane)
> > >  static const struct drm_plane_funcs sti_gdp_plane_helpers_funcs = {
> > >       .update_plane = drm_atomic_helper_update_plane,
> > >       .disable_plane = drm_atomic_helper_disable_plane,
> > > -     .destroy = sti_gdp_destroy,
> > > +     .destroy = drm_plane_cleanup,
> > >       .reset = sti_plane_reset,
> > >       .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > >       .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> > > diff --git a/drivers/gpu/drm/sti/sti_hqvdp.c b/drivers/gpu/drm/sti/sti_hqvdp.c
> > > index 23565f52dd71..065a5b08a702 100644
> > > --- a/drivers/gpu/drm/sti/sti_hqvdp.c
> > > +++ b/drivers/gpu/drm/sti/sti_hqvdp.c
> > > @@ -1256,13 +1256,6 @@ static const struct drm_plane_helper_funcs sti_hqvdp_helpers_funcs = {
> > >       .atomic_disable = sti_hqvdp_atomic_disable,
> > >  };
> > >
> > > -static void sti_hqvdp_destroy(struct drm_plane *drm_plane)
> > > -{
> > > -     DRM_DEBUG_DRIVER("\n");
> > > -
> > > -     drm_plane_cleanup(drm_plane);
> > > -}
> > > -
> > >  static int sti_hqvdp_late_register(struct drm_plane *drm_plane)
> > >  {
> > >       struct sti_plane *plane = to_sti_plane(drm_plane);
> > > @@ -1274,7 +1267,7 @@ static int sti_hqvdp_late_register(struct drm_plane *drm_plane)
> > >  static const struct drm_plane_funcs sti_hqvdp_plane_helpers_funcs = {
> > >       .update_plane = drm_atomic_helper_update_plane,
> > >       .disable_plane = drm_atomic_helper_disable_plane,
> > > -     .destroy = sti_hqvdp_destroy,
> > > +     .destroy = drm_plane_cleanup,
> > >       .reset = sti_plane_reset,
> > >       .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > >       .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> > > diff --git a/drivers/gpu/drm/sti/sti_tvout.c b/drivers/gpu/drm/sti/sti_tvout.c
> > > index ea4a3b87fa55..4dc3b2ec40eb 100644
> > > --- a/drivers/gpu/drm/sti/sti_tvout.c
> > > +++ b/drivers/gpu/drm/sti/sti_tvout.c
> > > @@ -788,21 +788,6 @@ static void sti_tvout_create_encoders(struct drm_device *dev,
> > >       tvout->dvo = sti_tvout_create_dvo_encoder(dev, tvout);
> > >  }
> > >
> > > -static void sti_tvout_destroy_encoders(struct sti_tvout *tvout)
> > > -{
> > > -     if (tvout->hdmi)
> > > -             drm_encoder_cleanup(tvout->hdmi);
> > > -     tvout->hdmi = NULL;
> > > -
> > > -     if (tvout->hda)
> > > -             drm_encoder_cleanup(tvout->hda);
> > > -     tvout->hda = NULL;
> > > -
> > > -     if (tvout->dvo)
> > > -             drm_encoder_cleanup(tvout->dvo);
> > > -     tvout->dvo = NULL;
> > > -}
> > > -
> > >  static int sti_tvout_bind(struct device *dev, struct device *master, void *data)
> > >  {
> > >       struct sti_tvout *tvout = dev_get_drvdata(dev);
> > > @@ -815,17 +800,8 @@ static int sti_tvout_bind(struct device *dev, struct device *master, void *data)
> > >       return 0;
> > >  }
> > >
> > > -static void sti_tvout_unbind(struct device *dev, struct device *master,
> > > -     void *data)
> > > -{
> > > -     struct sti_tvout *tvout = dev_get_drvdata(dev);
> > > -
> > > -     sti_tvout_destroy_encoders(tvout);
> > > -}
> > > -
> > >  static const struct component_ops sti_tvout_ops = {
> > >       .bind   = sti_tvout_bind,
> > > -     .unbind = sti_tvout_unbind,
> >
> > Hm, this here looks strange now. I'd put a comment somewhere that
> > master_ops->unbind cleans up everything. Either way:
> >
> > Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
>
> Hi Daniel,
>
> unbind undo what has been done in bind even the functions aren't symetric:
> encoder creation are done is this level of the driver while they
> destruction is done
> in the top level of the driver by calling drm shutdown function. From
> module point of view
> bind and unbind are balanced correctly.
> I have test it on board :-)

Yes that's my understanding too, but then I stumbled over this revert
(I cc'ed you on it):

https://lore.kernel.org/patchwork/patch/1000524/

Now I'm not sure anymore whether my r-b is correct. What happens if
only one of the components gets unbound, and not the top level?

> I will not merge this patch until I get a clear review from you.

You had one, but I just retracted it because of the revert ...
-Daniel

>
> Regards,
> Benjamin
> >
> > >  };
> > >
> > >  static int sti_tvout_probe(struct platform_device *pdev)
> > > --
> > > 2.15.0
> > >
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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