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drm/atomic-state-helper: set pixel_blend_mode to prop default on reset

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In __drm_atomic_helper_plane_state_init(), pixel_blend_mode is always
reset to DRM_MODE_BLEND_PREMULTI. That was consistent while
drm_plane_create_blend_mode_property() required PREMULTI in the
supported modes, but it now falls back to COVERAGE or PIXEL_NONE when
the driver doesn't support PREMULTI. The hardcoded default may therefore
not be a blend mode the hardware can do, nor one the property
advertises.

Initialize pixel_blend_mode from the blend mode property default
instead, keeping DRM_MODE_BLEND_PREMULTI for planes without the
property.

Fixes: 9813e158d1 ("drm/drm_blend: allow blend mode property without PREMULTI")
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Link: https://patch.msgid.link/20260826104143.39077-2-mwen@igalia.com
This commit is contained in:
Melissa Wen 2026-08-26 12:37:05 +02:00 committed by Melissa Wen
parent 774b73428e
commit c3080b58d8
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/drm_atomic_state_helper.c
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@ -278,7 +278,14 @@ void __drm_atomic_helper_plane_state_init(struct drm_plane_state *plane_state,
plane_state->rotation = DRM_MODE_ROTATE_0;
plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE;
plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
if (plane->blend_mode_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->blend_mode_property,
&val))
plane_state->pixel_blend_mode = val;
}
if (plane->color_encoding_property) {
if (!drm_object_property_get_default_value(&plane->base,