linux-kernel - Re: [PATCH] drm/ssd130x: Use drm_atomic_get_new_plane

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Date:   Fri, 23 Sep 2022 12:43:07 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/ssd130x: Use drm_atomic_get_new_plane_state()

On Fri, Sep 23, 2022 at 11:16:00AM +0200, Javier Martinez Canillas wrote:
> Hello Ville,
> 
> On 9/23/22 11:05, Ville Syrjälä wrote:
> > On Fri, Sep 23, 2022 at 10:34:47AM +0200, Javier Martinez Canillas wrote:
> >> The struct drm_plane .state shouldn't be accessed directly but instead the
> >> drm_atomic_get_new_plane_state() helper function should be used.
> >>
> >> This is based on a similar patch from Thomas Zimmermann for the simpledrm
> >> driver. No functional changes.
> >>
> >> Suggested-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> >> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> > 
> > Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> >
> 
> Thanks.
>  
> > I wonder how many naked obj->state dereferences are still
> > left in places where they should be using the get_{new,old}()
> > stuff. Might have to write a bit of cocci to find out...
> > 
> > 
> > Btw on a somewhat related note, I've been thinking about bringing
> > for_each_crtc_in_state() & co. back (got removed in commit
> > 77ac3b00b131 ("drm/atomic: Remove deprecated accessor macros"))
> > but this time without any object state iterator variable. Now that
> > we're more often just plumbing the full atomic state through I
> > think there are bunch of places that don't need the object state(s)
> > within the loop at all, so having to have those variables around
> > makes the whole thing a bit noisy. Also IIRC we had to add some
> > (void) casts into the current macros to hide some compiler warnings
> > about unused variables. Could get rid of at least some of those extra
> > casts again.
> > 
> > I don't suppose there's anyone interested in doing that so I don't
> > have to? ;)
> > 
> 
> Maybe you can add an entry in Documentation/gpu/todo.rst, explaining
> this and putting yourself as a contact? 

Seems about as much work as just doing it.

-- 
Ville Syrjälä
Intel