Re: [PATCH v2 0/3] drm/nouveau: Fix WARN_ON() from missing blend modes

[lyude@redhat.com]

I had thought that testing this on fbcon would be enough, but there is
still more issues with this series I found when adding these to the
kernel I dog food on my desktop. Will figure them out and send another
respin of this series asap

On Mon, 2026-07-20 at 16:43 -0400, Lyude Paul wrote:
> Recently a change went into the kernel to ensure that drivers which
> expose color formats which have alpha channels. This would cause
> nouveau
> to hit a WARN_ON when setting up cursors, since they do support
> blending
> - but we never bothered trying to hook up the controls for it to
> nouveau.
> 
> This fixes the issue by ensuring that nouveau always exposes a blend
> mode for any planes with alpha channels, regardless of whether or not
> we
> have control of the blend mode hooked up. If someone wants to add
> control for this in the future as well, it should be fairly easy to
> hook
> up with this.
> 
> Previous version:
> 	https://patchwork.freedesktop.org/patch/741031/
> 
> Lyude Paul (3):
>   drm/nouveau/kms/nv50-: Add .blend_modes to nv50_wndw_func
>   drm/nouveau/kms/nv50-: Introduce nv50_wndw_default_state()
>   drm/nouveau/kms/nv50-: Unconditionally create blend_mode prop for
>     wndws
> 
>  drivers/gpu/drm/nouveau/dispnv50/curs507a.c |  3 ++
>  drivers/gpu/drm/nouveau/dispnv50/disp.c     |  4 +++
>  drivers/gpu/drm/nouveau/dispnv50/wndw.c     | 40 +++++++++++++++++--
> --
>  drivers/gpu/drm/nouveau/dispnv50/wndw.h     | 11 ++++++
>  drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c |  1 +
>  drivers/gpu/drm/nouveau/dispnv50/wndwc57e.c |  1 +
>  drivers/gpu/drm/nouveau/dispnv50/wndwc67e.c |  1 +
>  drivers/gpu/drm/nouveau/dispnv50/wndwca7e.c |  1 +
>  8 files changed, 55 insertions(+), 7 deletions(-)
> 
> 
> base-commit: b0a652436b892eb9a036a031b33099dca036faaa