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drm/verisilicon: set blend mode for the cursor plane

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Blend mode properties are now required to expose pixel formats w/ alpha.

Experiments show that the fixed blending mode for the cursor seems to be
COVERAGE:

- With a cursor plane filled with R=G=0, B=0xff, A=0x40, the cursor is
  visible on a pure-white background, which means the background is
  multiplied.
- With a cursor plane filled with R=G=B=0xff, A=0x40, the cursor isn't
  pure white and non-white patterns can be see through, which means the
  cursor is multiplied.

Add a fixed COVERAGE blend mode property for the cursor plane.

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260910094904.3502741-1-zhengxingda@iscas.ac.cn
This commit is contained in:
Icenowy Zheng 2026-09-10 17:49:04 +08:00
parent 666f12ae9f
commit 5a83606d9f
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/verisilicon/vs_cursor_plane.c
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@ -11,6 +11,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
@ -267,6 +268,7 @@ struct drm_plane *vs_cursor_plane_init(struct drm_device *drm_dev,
return plane;
drm_plane_helper_add(plane, &vs_cursor_plane_helper_funcs);
drm_plane_create_blend_mode_property(plane, BIT(DRM_MODE_BLEND_COVERAGE));
return plane;
}