From: Michail Tatas <michail.tatas@gmail.com>
To: louis.chauvet@bootlin.com, simona@ffwll.ch,
melissa.srw@gmail.com, mripard@kernel.org, tzimmermann@suse.de,
airlied@gmail.com, hamohammed.sa@gmail.com,
maarten.lankhorst@linux.intel.com
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH] [PATCH] drm/vkms: Advertise PREMULTI blend mode
Date: Mon, 20 Jul 2026 03:17:22 +0300 [thread overview]
Message-ID: <al1pElMQZsDfpAYI@michalis-linux> (raw)
Since we only support pre-multiplied alpha blend mode,
advertise that, otherwise validate_blend_mode_for_alpha_formats()
will throw a WARN.
Reported-by: syzbot+6245cb95ae707991bffa@syzkaller.appspotmail.com
Signed-off-by: Michail Tatas <michail.tatas@gmail.com>
---
syzbot link: https://syzkaller.appspot.com/bug?extid=6245cb95ae707991bffa
drivers/gpu/drm/vkms/vkms_plane.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 68cb2a3335e6..a2e5ebee729a 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -246,6 +246,12 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
DRM_COLOR_YCBCR_BT601,
DRM_COLOR_YCBCR_FULL_RANGE);
+ /* Since our composer only supports pre-multiplied alpha,
+ * advertise only the PREMULTI blend mode.
+ */
+ drm_plane_create_blend_mode_property(&plane->base,
+ BIT(DRM_MODE_BLEND_PREMULTI));
+
if (vkms_config_plane_get_default_pipeline(plane_cfg))
vkms_initialize_colorops(&plane->base);
--
2.43.0
reply other threads:[~2026-07-20 0:17 UTC|newest]
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