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[176.58.251.75]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4955fc42db7sm16191785e9.3.2026.07.19.17.17.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Jul 2026 17:17:25 -0700 (PDT) Date: Mon, 20 Jul 2026 03:17:22 +0300 From: Michail Tatas 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 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Mailman-Approved-At: Mon, 20 Jul 2026 07:15:03 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 --- 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