[PATCH v2 19/19] drm: Make passing of format info to drm_helper_mode_fill_fb_struct() mandatory

[Imre Deak]

On Tue, Aug 12, 2025 at 04:33:48PM -0500, Timur Tabi wrote:
> On Mon, Jul 28, 2025 at 5:25 AM Imre Deak <imre.deak at intel.com> wrote:
> >
> > Ok, thanks for testing it. I realized that it's better to fix this
> > aligning with the conversion for the rest of the drivers in the original
> > [1] patchset, could you still give a try if the corresponding patch [2]
> > also fixes the issue for you?
> 
> Looks like Nouveau is broken the same way:
> 
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> > index 1ddd92901526..e1e542126310 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> > @@ -321,7 +321,7 @@ nouveau_framebuffer_new(struct drm_device *dev,
> >         if (!(fb = *pfb = kzalloc(sizeof(*fb), GFP_KERNEL)))
> >                 return -ENOMEM;
> >
> > -       drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
> > +       drm_helper_mode_fill_fb_struct(dev, fb, NULL, mode_cmd);
> >         fb->obj[0] = gem;
> >
> >         ret = drm_framebuffer_init(dev, fb, &nouveau_framebuffer_funcs);
> 
> fb->format is NULL when drm_framebuffer_init() is called.  This is in
> the drm-misc-next branch.

The issue got fixed by
https://cgit.freedesktop.org/drm/drm-misc/commit/?h=drm-misc-next-fixes&id=d2b524c90643