[PATCH] drm/tidss: Add prepare_fb to the plane helper funcs

[Daniel Vetter]

On Thu, Feb 27, 2020 at 11:31:39AM +0100, Daniel Vetter wrote:
> On Thu, Feb 27, 2020 at 12:13:07PM +0200, Jyri Sarha wrote:
> > From: Gowtham Tammana <g-tammana at ti.com>
> > 
> > drm_gem_fb_prepare_fb() extracts fence and attaches to plane state.
> > The fence info is needed if implicit fencing is used. Add this as
> > prepare_fb function pointer to plane helper funcs.
> > 
> > Signed-off-by: Gowtham Tammana <g-tammana at ti.com>
> > Signed-off-by: Jyri Sarha <jsarha at ti.com>
> 
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> 
> I still wonder what we could do to catch these kind of bugs. There's
> really no good reason to ever not do this as the fallback ...
> 
> Maybe time to just make this the default prepare_fb hook if neither
> prepare_fb nore cleanup_fb are provided? Then roll out the removal for all
> the drivers that just set this one. Otherwise we'll keep playing
> whack-a-mole here forever ...
> 
> Ofc would need a bit of review and kerneldoc update, but I think that'd be
> the right approach.

Ok we'd need a notch more work here:

- Extract a version of drm_gem_fb_prepare_fb which doesn't keel over if
  the gem object isn't set in the fb struct. That will take care of all
  the drivers not yet converted to using these pointers, or which don't
  use gem (only applies for vmwgfx).

- Add that as the default in drm_simple_kms_plane_prepare_fb and clean up
  drivers using simple helpers too.

- Then long patch series to remove the default hook from all of them.

Just from a quick grep this would fix endless amounts of drivers ...
-Daniel

> -Daniel
> 
> > ---
> >  drivers/gpu/drm/tidss/tidss_plane.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/tidss/tidss_plane.c b/drivers/gpu/drm/tidss/tidss_plane.c
> > index ff99b2dd4a17..345678faaeb6 100644
> > --- a/drivers/gpu/drm/tidss/tidss_plane.c
> > +++ b/drivers/gpu/drm/tidss/tidss_plane.c
> > @@ -10,6 +10,7 @@
> >  #include <drm/drm_crtc_helper.h>
> >  #include <drm/drm_fourcc.h>
> >  #include <drm/drm_fb_cma_helper.h>
> > +#include <drm/drm_gem_framebuffer_helper.h>
> >  
> >  #include "tidss_crtc.h"
> >  #include "tidss_dispc.h"
> > @@ -142,6 +143,7 @@ static void tidss_plane_atomic_disable(struct drm_plane *plane,
> >  }
> >  
> >  static const struct drm_plane_helper_funcs tidss_plane_helper_funcs = {
> > +	.prepare_fb = drm_gem_fb_prepare_fb,
> >  	.atomic_check = tidss_plane_atomic_check,
> >  	.atomic_update = tidss_plane_atomic_update,
> >  	.atomic_disable = tidss_plane_atomic_disable,
> > -- 
> > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> > 
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> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch