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drm/loongson: Create blend mode property for cursor plane

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After commit 860e748bdd ("drm: ensure blend mode supported if pixel
format with alpha exposed") we get warnings at boot:

loongson 0000:00:06.1: [drm] [PLANE:41:ls-cursor-plane-0] pixel format with alpha exposed but blend mode not setup. Please fix.
loongson 0000:00:06.1: [drm] [PLANE:46:ls-cursor-plane-1] pixel format with alpha exposed but blend mode not setup. Please fix.

The reason is the cursor plane supports color formats with alpha but the
driver doesn't create blend mode property, which triggers the warning in
validate_blend_mode_for_alpha_formats().

The loongson DC HW doesn't support DRM_MODE_BLEND_PREMULTI, so create
blend mode property with DRM_MODE_BLEND_COVERAGE for cursor planes since
it is the only one implemented in the driver.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Link: https://patch.msgid.link/20260903084212.3621540-1-chenhuacai@loongson.cn
This commit is contained in:
Huacai Chen 2026-09-03 16:42:12 +08:00 committed by Icenowy Zheng
parent 6c62dfd282
commit 5535d5e61a
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/loongson/lsdc_plane.c
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@ -7,6 +7,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_print.h>
@ -765,7 +766,7 @@ int ls7a1000_cursor_plane_init(struct drm_device *ddev,
drm_plane_helper_add(plane, &ls7a1000_cursor_plane_helper_funcs);
return 0;
return drm_plane_create_blend_mode_property(plane, BIT(DRM_MODE_BLEND_COVERAGE));
}
int ls7a2000_cursor_plane_init(struct drm_device *ddev,
@ -790,5 +791,5 @@ int ls7a2000_cursor_plane_init(struct drm_device *ddev,
drm_plane_helper_add(plane, &ls7a2000_cursor_plane_helper_funcs);
return 0;
return drm_plane_create_blend_mode_property(plane, BIT(DRM_MODE_BLEND_COVERAGE));
}