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drm: Allow building a planes-only state with no primary

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Some drivers allow a planes-only state as long as something covers
the entire CRTC, and some allow planes-only state even with only
partial coverage.

If we have an fb that we'd like to put on the primary plane, but can't,
we might as well try it on an overlay anyway and see if we can build a
planes-only state without a primary.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2026-02-27 14:10:04 -06:00
parent d665061f4d
commit 8b7e72d8fa
1 changed files with 10 additions and 11 deletions
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21
libweston/backend-drm/state-propose.c
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@ -712,7 +712,7 @@ drm_output_find_plane_for_view(struct drm_output_state *state,
bool scanout_has_view_assigned;
bool view_matches_entire_output;
bool scanout_plane_possible;
bool must_use_scanout_plane;
bool may_use_scanout_plane;
scanout_has_view_assigned =
drm_output_check_plane_has_view_assigned(output->scanout_handle->plane,
@ -722,12 +722,12 @@ drm_output_find_plane_for_view(struct drm_output_state *state,
background_region,
&output->base);
must_use_scanout_plane = !scanout_has_view_assigned && view_matches_entire_output;
may_use_scanout_plane = !scanout_has_view_assigned && view_matches_entire_output;
scanout_plane_possible = possible_plane_mask & (1 << output->scanout_handle->plane->plane_idx) &&
pnode_can_use_plane(state, scanout_handle, pnode);
if (must_use_scanout_plane && scanout_plane_possible && fb) {
if (may_use_scanout_plane && scanout_plane_possible && fb) {
uint64_t zpos;
if (current_lowest_zpos == DRM_PLANE_ZPOS_INVALID_PLANE)
@ -738,15 +738,14 @@ drm_output_find_plane_for_view(struct drm_output_state *state,
ps = drm_output_try_paint_node_on_plane(scanout_handle,
state, pnode, mode,
fb, zpos);
if (ps) {
drm_fb_unref(fb);
return ps;
}
}
if (must_use_scanout_plane) {
if (!ps)
pnode->try_view_on_plane_failure_reasons |=
FAILURE_REASONS_PLANES_REJECTED;
drm_fb_unref(fb);
return ps;
}
/* Maybe we can still build a planes only state without
* the scanout plane at all.
*/
}
/* assemble a list with possible candidates */