Re: [PATCH v4 0/2] drm/drm_blend: allow blend mode property without PREMULTI

[Pekka Paalanen <pekka.paalanen@collabora.com>]

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On Tue, 26 May 2026 15:16:58 -0300
Leandro Ribeiro <leandro.ribeiro@collabora.com> wrote:

> Some hardware only supports the COVERAGE blend mode and lacks PREMULTI
> support entirely. DRM currently requires that PREMULTI is present when
> creating a blend mode property, which prevents such drivers from being
> properly upstreamed.
> 
> This series removes this restriction and allows drivers to create a blend
> mode property without PREMULTI.
> 
> On Weston (userspace), we are working [1] towards adding support for
> this kind of hardware.
> 
> [1] https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/2046

Hi,

the series is:

Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>

Thanks.

> 
> v4:
> - Trigger warnings instead of errors when pixel format with alpha is
>   exposed but blend mode is not setup.
> - Require blend mode only when plane exposes pixel formats with alpha, not
>   when it supports the alpha property.
> 
> v3:
> - Changed where we enforce drivers to expose blend mode for planes that
>   support the alpha property or pixel formats with alpha.
> - Fixed missing check to forbid calling
>   drm_plane_create_blend_mode_property() with a zero bitmask of
>   supported modes.
> 
> v2:
> - Force drivers to expose blend mode if plane supports alpha property
>   or pixel format with alpha.
> 
> Leandro Ribeiro (2):
>   drm/drm_blend: allow blend mode property without PREMULTI
>   drm: ensure blend mode supported if pixel format with alpha exposed
> 
>  drivers/gpu/drm/drm_blend.c       | 20 ++++++++++++++------
>  drivers/gpu/drm/drm_mode_config.c | 21 +++++++++++++++++++++
>  2 files changed, 35 insertions(+), 6 deletions(-)
> 


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