drm: ensure blend mode supported if pixel format with alpha exposed

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Before "drm/drm_blend: allow blend mode property without PREMULTI",
userspace would have to assume that only PREMULTI was supported by
drivers that didn't expose the blend mode property. But now userspace
shouldn't rely on that, as they can't count with drivers always
supporting PREMULTI.

Warn if a driver exposes pixel formats with alpha but doesn't expose the
blend mode property. This way userspace doesn't have to guess. Drivers
triggering this warning must be fixed.

Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Link: https://patch.msgid.link/20260526181700.25310-3-leandro.ribeiro@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>

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Leandro Ribeiro 2026-05-26 15:17:00 -03:00 • committed by Daniel Stone

parent 9813e158d1

commit 860e748bdd

1 changed files with 21 additions and 0 deletions

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drivers/gpu/drm/drm_mode_config.c

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